CSS 06-3188-01 OCLPC August 2021 NSWCCOR.pdf

OCLPC CALIBRATION STANDARD SPECIFICATION CSS 06-3188-01

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Table of Contents

1.0 SCOPE

1.1 General

1.2 Usage

1.3 Enclosure

1.4 Configuration

2.0 APPLICABLE DOCUMENTS

2.1 Reference Documents

2.2 Order of Precedence

3.0 REQUIREMENTS

3.1 Safety

3.2 Equipment Components

3.2.1 Finish

3.2.2 Interchangeability

3.2.3 Restricted Materials

3.3 Design and Construction

3.3.1 Operator Adjustments and Controls

3.3.2 Connectors, electric

3.3.3 Cooling Devices

3.3.4 Front Panel Display

3.3.5 Self-Test Capability

3.4 Digital Interface

3.4.1 Digital Interface Requirements

3.5 Electrical

3.5.1 Electrical

3.5.2 Electrical Power Connections

3.6 Enclosure Physical Characteristics

3.6.1 Dimensions

3.6.2 Weight

3.6.3 Enclosure Requirements

3.7 Marking and Identification

3.7.1 Marking

3.7.2 Equipment Identification

3.8 Environmental Requirements

3.8.1 Warm-up

3.8.2 Temperature and Humidity

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3.8.3 Altitude

3.8.4 Vibration

3.8.5 Shock, mechanical

3.8.6 Water Resistance

3.8.7 Fungus Resistance

3.8.8 Salt Atmosphere

3.8.9 Dust Exposure

3.8.10 Acoustic Noise

3.9 Performance Requirements

3.9.1 Measurement Range and Uncertainty

3.9.2 TI Types

3.9.3 Pressure Generation and Control

3.9.4 Pressure Measurement

3.9.5 Pressure Medium

3.9.6 Pressure Sensors

3.9.7 Pressure Indicator

3.9.8 Temperature Compensation

3.10 Accessories

3.10.1 Equipment Connections

3.10.2 Hose Assemblies

3.10.3 Calibration Accessories

3.10.4 Adapter Accessories

3.11 Maintainability

3.11.1 Fault Isolation

3.11.2 Preventive Maintenance

3.11.3 Cleaning for Oxygen Service

3.11.4 Washability

3.11.5 Maintenance Provisions

3.11.6 Repair

1.0 SCOPE

1.1 General. This document specifies the minimum requirements for an Oxygen Clean Low Pressure Calibrator. For the purpose of this calibration standards specification (CSS), the Oxygen Clean Low Pressure Calibrator shall be shortened to OCLPC.

The OCLPC shall be used to calibrate numerous oxygen clean test instruments (TI) in Navy oxygen clean instrumentation rooms (OICR) and various on-site locations.

The OCLPC shall be capable of generating, controlling, and monitoring pressure from -13.2 to 200 pound-force per square inch, gauge (psig). Required measurement uncertainties are enumerated in 3.9 Performance Requirements. The OCLPC shall be used by Navy personnel in shipboard and shore-based laboratories and for on-site and in-place calibration.

1.2 Usage. Equipment covered by this CSS is intended for use in testing equipment and systems in the natural and controlled environments in which Military equipment is operated. Equipment will also be subjected to operational conditions aboard land, sea, and air vehicles, both military and commercial during periods of operation, transportation, and storage. The requirements of this CSS are tailored to the intended use of the equipment.

1.3 Enclosure. For the purpose of this CSS, the enclosure refers to the case for each individual major component. The enclosure provides protection for the individual system component during storage, handling, and use. The color of the enclosure shall be green.

1.4 Configuration. Configuration is used to identify two or more units from a single purchase description that differ in class or other electrical or mechanical characteristics. The OCLPC shall have one configuration.

2.0 APPLICABLE DOCUMENTS

2.1 Reference Documents. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issues of these documents shall be those in effect on the date of this solicitation.

DEPARTMENT OF DEFENSE STANDARDS AND SPECIFICATIONS

MIL-PRF-28800 - Test Equipment for use with Electrical and Electronic Equipment, General Specification for

MIL-PRF-38793 Manuals, Technical: Calibration Procedures Preparation of.

MIL-STD-130 - Standard Practice of Identification Marking of U.S. Military Property

MIL-STD-1330 - Precision Cleaning and Testing of Shipboard Oxygen, Helium, Helium-Oxygen, Nitrogen, and Hydrogen Systems

MIL-STD-1622 - Cleaning of Shipboard Compressed Air Systems

(Copies of DoD Standards are available online at https://quicksearch.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

DEPARTMENT OF DEFENSE HANDBOOKS

MIL-HDBK-781 - Reliability Test Methods, Plans, and environments for Engineering Development, Qualification and Production

(Copies of DoD Handbooks are available online at https://quicksearch.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY

NIST Special Publication 811 - Guide for the Use of the International System of Units (SI)

(Copies of NIST documents are available online at http://physics.nist.gov/cuu/pdf/sp811.pdf or Standards Information Center, 100 Bureau Drive, Stop 2100 Gaithersburg, MD 20899-2100 or Email: ncsci@nist.gov Phone: (301) 975-4040.)

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA)

NASA-STD-6001B - Flammability, Offgassing, and Compatibility Requirements and Test Procedures

NASA/TM-2007-213740 - Guide for Oxygen Compatibility Assessments on Oxygen Components and Systems

(Copies of NASA documents are available online at the NASA Technical Standards System https://standards.nasa.gov/ or NASA Technical Reports Server https://ntrs.nasa.gov/)

UNITED STATES NAVY (USN)

SS521-AG-PRO-010 - US Navy Diving Manual Rev. 7 Change A

(Copies of USN publically released diving publications are available online at https://www.navsea.navy.mil/Home/SUPSALV/00C3-Diving/Diving-Publications/)

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI/ISA S82.03 - Safety Standard for Electrical and Electronic Test, Measuring, Controlling and Related

Equipment (Electrical and electronic Process Measurement and Control Equipment)

(Copies of ANSI documents are available from http://webstore.ansi.org/ or ANSI Attn:

Customer Service Department, 25 W 43rd Street, 4th Floor, New York, NY, 10036)

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME B1.20.1 - Pipe Threads, General Purpose, Inch

(Copies of ASME documents are available from www.asme.org or ASME Information Central Orders/Inquiries, P.O. Box 2300, Fairfield, NJ 07007-2300.)

ELECTRONIC INDUSTRIES ASSOCIATION (EIA)

EIA/ECA-310 - Racks, Panels and Associated Equipment

(Copies of EIA documents are available online at http://www.eia.org or Electronic Industries Association, 2500 Wilson Blvd, Arlington, VA 22201.

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 260.1 - IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units)

IEEE 315 - Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters)

(Copies of IEEE documents are available from http://www.ieee.org or IEEE Service Center, 445 Hoes Lane, Piscataway, NJ 08854-1331.)

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC 60488-1 - Standard for Higher Performance Protocol for the Standard Digital Interface for Programmable Instrumentation

IEC 60488-2 - Standard Digital Interface for Programmable Instrumentation

IEC 61010-1 - Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use (General Requirements)

(Copies of IEC documents are available online at http://www.iec.ch/ or EC publications are available in the US from the Sales Department. American National Standards Institute, 11 West 42nd Street,113 Floor, New York, NY 10036, USA.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 7779 - Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment

(Copies of ISO documents are available online at http://www.iso.org/iso/home.html or International Organization for Standardization (ISO) 1, ch. de la Voie-Creuse, Case postale 56, CH-1211 Geneva 20, Switzerland)

LAN EXTENSIONS FOR INSTRUMENTATION (LXI) CONSORTIUM

LXI Device Specification 2016 - LAN Extensions for Instrumentation (LXI) Standard

(Copies of LXI documents are available online at http://www.lxistandard.org or LXI Consortium, PO Box 1016, Niwot, CO 80544-1016.)

STANDARD COMMANDS FOR PROGRAMMABLE INSTRUMENTS (SCPI)

CONSORTIUM

SCPI Volume I -1999 - Standard Commands for Programmable Instruments (SCPI)

(Copies of SCPI documents are available online at http://www.ivifoundation.org or IVI Foundation Corporate Office, PO Box 1016, Niwot, CO 80544-1016.)

SOCIETY OF AUTOMOTIVE ENGINEERS (SAE)

SAE AS4841 - Fittings, 37 Degree Flared, Fluid Connection

(Copies of SAE documents are available at http://www.sae.org/technical/standards/AS4841or SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)

WORLD WIDE WEB (W3C) CONSORTIUM

SVG Specification 1.1 - Scalar Vector Graphics (SVG) 1.1 Specification

(Copies of W3C documents are available online at http://www.w3.org)

2.2 Order of Precedence. In the event of conflict between the text of this CSS and the references cited herein, the text of this specification shall take precedence. Nothing in this CSS, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.0 REQUIREMENTS

3.1 Safety. The equipment shall comply with the safety requirements of IEC 61010-1.

For safety ground all accessible surfaces of the equipment shall be at ground potential. The power cable shall include a safety ground conductor. This is also true of drawer assemblies; disconnecting the safety ground shall also disconnect the power conductors.

3.2 Equipment Components. Parts, materials, and process shall be as specified below in 3.2.1 Finish through 3.2.3.3 Combination of materials.

3.2.1 Finish. Finish shall be as normally provided by the manufacturer.

3.2.2 Interchangeability. A model number shall be designated for all units provided. All units and their replaceable assemblies, subassemblies, and parts comprising the unit shall be interchangeable.

3.2.3 Restricted Materials. Restricted materials shall be as specified below in 3.2.3.1 Material restricted for Navy use through 3.2.3.3 Combination of materials.

3.2.3.1 Material Restricted for Navy Use. The materials and parts specified in a through c shall not be used in equipment for the Navy except as specified herein. An exception is made for small lithium batteries used for memory backup as specified below in 3.5.1.6 Lithium batteries for lithium battery types approved for use.

a. Mercury, including mercury batteries

b. Radioactive material

c. Lithium electrochemical cells

3.2.3.2 Other Restricted Materials and Gases. The OCLPC shall not contain materials that promote the premature failure of the equipment or that present a health hazard under normal use or storage conditions as specified below in 3.2.3.2.1 Organic Materials through 3.2.3.2.5 Helium.

3.2.3.2.1 Organic Materials. The OCLPC shall not contain materials prone to organic decay or that act as a nutrient for the growth of multi-celled organisms.

3.2.3.2.2 Flammable Materials. The OCLPC shall not contain materials that ignite into flames at operating or storage temperatures. The OCLPC shall not contain materials that are susceptible to ignition in oxygen enriched environments (defined here as >21% Oxygen concentration) if it is possible for the materials to be introduced into the TI.

If such materials are not known to be compatible with oxygen enriched environments in the operating parameters in 3.9 Performance Requirements, analysis in accordance with NASA-STD-6001B or equivalent must be provided.

3.2.3.2.3 Explosive Materials. The OCLPC shall not contain materials that explode at operating or storage temperatures.

3.2.3.2.4 Carcinogens. Certain chemicals have been identified in the Occupational Safety And Health Act (OSHA) as cancer-producing substances (carcinogens).

Materials that might contain these chemicals shall not be used unless specifically required and approved by Naval Surface Warfare Center, Corona Division.

3.2.3.2.5 Helium. Helium shall not be used as pressurizing gas in sealed units containing electron tubes. When necessary to use helium for leak detection purposes, exposure shall be limited to the time necessary for the test, followed by thorough purging.

3.2.3.3 Combination of Materials. The equipment shall contain no combination of materials that cause deterioration of any material contained in the equipment due to the effects of outgassing.

3.3 Design and Construction. The OCLPC shall be designed and constructed to permit inspection for compliance with all requirements in this CSS.

3.3.1 Operator Adjustments and Controls. Operator adjustments and controls shall be as specified below in 3.3.1.1 Operator adjustments and 3.3.1.2 Operator controls.

3.3.1.1 Operator Adjustments. The equipment shall include built-in adjustments or compensating devices for any function or parameter that would exceed the specified tolerance within the calibration interval.

3.3.1.2 Operator Controls. Operating controls and indicators shall be readily accessible to the operator from the front of the equipment. Indications presented on the display(s), control(s), indicator(s), etc. shall not require operator conversion or calculation.

3.3.2 Connectors, electric. Provision shall be made to ensure that connectors will be mated only with the appropriate counterparts. Where design considerations require close proximity of connectors of similar configuration, the mating connectors shall be suitably coded or marked. The live or hot side of unmated connectors shall be protected against shorting.

3.3.3 Cooling Devices. Cooling devices used in the equipment shall be an integral part of the equipment and not degrade any aspect of performance or safety.

3.3.4 Front Panel Display. Front panel/control panel display(s) and/or indicator(s) designed to present information to the operator shall be distinguishable at a distance of 1 m in a maximum ambient light level of 100 foot-candles (fc) and a minimum light level of 10 fc. All display(s) and/or indicator(s) shall be discernible at viewing angles from 0 (perpendicular) to 45 degrees in any direction.

3.3.5 Self-Test Capability. The OCLPC shall perform an automatic diagnostic self-test at startup. The self-test shall determine operational readiness and isolate faulty modules. The information provided by the self-test shall indicate operational readiness. If failure occurs, the assembly, subassembly, component, etc. causing the malfunction shall be identified.

3.4 Digital Interface. A digital interface shall be provided and shall meet the requirements as specified below in 3.4.1 Digital interface requirements. The digital interface shall include one or more of the following:

a. IEEE 488.2 General Purpose Interface Bus (GPIB) conforming to IEC 60488-

2:2004/IEEE 488.2-1992.

b. RS-232 conforming to Telecommunications Industry Association TIA-232

c. Universal Serial Bus (USB) conforming to USB 2.0 or 3.0.

3.4.1 Digital Interface Requirements. The digital interface shall have the programmable capability to control each device function including all ranges, modes, and levels.

The digital interface shall support control of the device without the need for any proprietary drivers or software. The syntax and style of programming commands shall conform to the Standard Commands for Programmable Instruments (SCPI).

The unit shall be capable of performing an automated calibration utilizing the digital interface to communicate with an external device. Primary power control and other non-measurement functions need not be controllable through the digital interface.

3.5 Electrical Power Sources and Connections. The electrical power sources and connections shall be as specified below in 3.5.1 Electrical power source and 3.5.2 Electrical power connections.

3.5.1 Electrical Power Source. The equipment shall operate from the input power conditions specified in 3.5.1.1 Power consumption through 3.5.1.6 Lithium batteries.

3.5.1.1 Power Consumption. The maximum power for operation of an OCLPC component that requires an external single phase 120 Vrms power source shall not exceed 1500 watts.

3.5.1.2 Nominal and Alternate Power Source. The equipment shall operate at the nominal values for voltage and frequency as specified in a and b below. An alternate power source is not required.

a. The nominal voltage shall be 120 Vrms

b. The nominal frequency shall be single phase, 50 Hz to 60 Hz

3.5.1.3 Steady-State Conditions. The performance and accuracy of the equipment shall not be adversely affected when operated under any combination of conditions a through c. Tolerance values are derived from, and referenced to, the nominal values specified for voltage and frequency in 3.5.1.2 Nominal and alternate power source above. For definitions of voltage waveform factor and harmonics, see MIL-PRF-28800F paragraph 6.5.1 (a) Voltage waveform deviation factor and 6.5.1 (b) Harmonics.

a. The steady-state voltage-tolerance shall be ±10%.

b. The steady-state frequency-tolerance shall be ±5%.

warn the operator of possible shock hazards during servicing, due to partially activated power supplies.

3.5.2.3 Excessive Current Drain Protection. An automated safety mechanism (circuit breaker/fuse) shall be incorporated to automatically disconnect the equipment in the event of current being drawn that is in excess of the equipment rating.

The mechanism shall be available from the control panel.

3.5.2.4 Power Indicators. Visual indication shall be provided on the front panel to indicate when the equipment is energized.

3.6 Enclosure Physical Characteristics. The physical characteristics of the equipment shall be as specified in 3.6.1 Dimensions through 3.6.3.9 Pressure equalizing valve.

3.6.1 Dimensions. Maximum dimensions of OCLPC major components, including handles and covers, shall not exceed a size capable of passage through hatches 508 mm wide by 965 mm high, reduced further by round corners on a 254 mm radius and through circular openings 635 mm in diameter.

3.6.2 Weight. The weight of OCLPC major components including all covers and accessories shall not exceed 30 pounds.

3.6.3 Enclosure Requirements. The OCLPC enclosure shall be as specified in 3.6.3.1 Cover through 3.6.3.9 Pressure equalizing valve. The enclosure may be a transit case if required; the requirements are the same. For the OCLPC an enclosure or transit case will perform the same functions.

3.6.3.1 Cover. The enclosure shall have a cover. The enclosure and cover interface shall have a gasket or offset lap seam to prevent entry of dirt or spray-type moisture or contaminates during shipping or storage. Any gasket used shall be easily replaced during routine maintenance.

3.6.3.2 Latches. There shall be a maximum of 6 latches per enclosure. The latches shall incorporate a quick-opening mechanism.

3.6.3.3 Stacking Provisions. Equipment enclosures shall have a geometric configuration that permits stacking without harm to the enclosure or its contents.

The stacking height (expressed as a quantity of equipment in excess of one) shall be 4 units.

3.6.3.4 Handles. The enclosure shall have one or more handles. The number and location of handles shall be such that the load distribution per handle shall not exceed 30 lbs. Handles shall be located above the equipment center of gravity to ensure carrying stability.

3.6.3.5 Accessory Stowage. Enclosures that have provisions for stowage of accessories, shall not adversely affect the carrying stability of the equipment and shall be contained in a manner that prevents damage to the accessories or equipment during transit. Stowed items shall be available without disturbing enclosure seams.

3.6.3.6 Corners. All corners shall be designed to preclude injury to personnel or damage to material. All corners shall be adequately reinforced to protect the instrument from damage during shipping, handling and storage.

3.6.3.7 Connections and Controls. All external electrical connections (except power and data connections) and operating controls shall be on the control panel.

3.6.3.8 Chassis Fasteners. The chassis shall be securely fastened within the enclosure conforming to the maintainability requirements of 3.11.4 Maintenance provisions.

3.6.3.9 Pressure Equalizing Valve. A mechanism for equalizing air pressure within the enclosure with the external ambient pressure, when the enclosure is sealed, shall be provided. The mechanism provided shall not protrude beyond the enclosure dimensions specified in 3.6.1 Dimensions.

3.7 Marking and Identification. Marking and identification of the OCLPC shall be as specified in 3.7.1 Marking through 3.7.2 Equipment Identification.

3.7.1 Marking. The OCLPC shall be marked in a manner that does not adversely affect safety or performance.

3.7.1.1 Reference Designations. Reference designations shall be used to identify each part for its particular circuit application. Subminiaturized and non-repairable assemblies need not be marked with reference designations. Reference designator usage shall be in accordance with ANSI Y32.2 and ANSI Y32.16.

3.7.1.2 Warning Markings. Warning markings shall warn of the location, the nature, and the extent of a hazard. Letters of warning markings shall be of clearly legible gothic capitals. Warning markings shall have high contrast between the letter and background colors. The markings shall be as permanent as normal life expectancy of the OCLPC, and located as close as possible to the point of danger. Warning markings indicating circuits of more than 500 Vdc or Vrms shall read:

DANGER HIGH VOLTAGE (maximum applicable voltage) VOLTS

Markings shall be in accordance with the requirements of ANSI/ISA-S82.02.01- 1999, which requires warning and caution markings to be formatted as specified in a through c.

a. The precautionary signal word shall be at least 2.5 mm high.

b. The text shall be at least 1.5 mm high and contrasting in color to background.

c. If molded or stamped in a material, text shall be at least 2.0 mm high and, if not contrasting in color, a depth or raised height of at least 0.5 mm.

3.7.1.3 Battery Warning Label. Equipment containing batteries shall be provided with a battery warning label attached to the equipment. Battery warning labels shall be:

3.7.1.4 Panel Markings and Processes. Panel markings shall enable the operator to identify the functions and use of all items requiring operator intervention.

3.7.2 Equipment Identification. All equipment, excluding small accessory items contained within a reusable pouch or container, shall be identified with the items specified in a through d.

a. Manufacturer name

b. Equipment model number with installed options

c. Equipment nomenclature

d. Serial number

3.7.2.1 Identification Plate. An equipment identification plate shall be affixed to the OCLPC enclosure when the enclosure also serves as the transit case. The identification plate shall contain the information provided below in either

3.7.2.1.1 Identification plate, single case if the OCLPC is contained within a single case, or 3.7.2.1.2 Identification plate, multiple cases if the OCLPC is contained within multiple cases. The identification plate shall be permanently affixed.

3.7.2.1.1 Identification Plate, single case. The identification plate for a single case shall contain the information provided in a through d.

a. Configuration model number or equipment model number with installed options

b. Configuration or equipment nomenclature

WARNING

REMOVE BATTERIES BEFORE SHIPMENT OR INACTIVE

STORAGE OF 30 DAYS OR MORE.

NOTE: DO NOT REMOVE INTERNAL MEMORY BACKUP

BATTERIES.

c. Configuration or manufacturer CAGE

d. Configuration serial number

3.7.2.1.2 Identification Plate, multiple cases. When multiple cases are required, the identification plate shall contain the information provided in a through g.

a. Configuration model number

b. Configuration nomenclature

c. Configuration CAGE

d. Configuration serial number

e. Case X of Y

f. Component nomenclature

g. Component part number

3.7.2.1.3 Identification Plate, supplemental. When accessories are required to meet the requirements of the CSS and the combination is given a part or model number designation that differs from that of the main unit, there shall be a supplemental identification plate containing the information in a and b. The plate shall be placed on the accessory container, as applicable. Whether or not a configuration model designation is assigned to the accessory or group of accessories, all major accessories shall be marked as in c:

a. Model configuration number: (Model number assigned to the equipment configuration).

b. Consists of: [part number of all components (excluding cables and adapters) comprising the equipment configuration].

c. Part of (or p/o): (Model number assigned to the equipment configuration, or main unit model number, as applicable), s/n: (serial number assigned to the equipment comprising the set or the serial number of the primary instrument if a separate s/n is not assigned to the set).

3.7.2.1.4 Identification Plate, transit case. The equipment transit case and enclosure, when serving as a transit case, shall be provided with an identification plate that is permanently affixed. An acceptable method of attachment is to use 1/8 inch diameter solid or semi-tubular rivets and backup washers. The identification plate shall be as specified below in 3.7.2.1.5 Identification plate, marking.

3.7.2.1.5 Identification Plate, marking. The plate background color shall be black. It shall have a minimum character size of 1/8 inch. All characters shall be permanent using best commercial practices for laser engraving, etching, or photosensitive marking of material.

3.7.2.2 Reusable Pouch or Container. If a reusable pouch or container is provided, containers shall be marked "accessories for use with" (test equipment nomenclature or model number), or, "maintenance aids for use with" (test equipment nomenclature or model number), as applicable.

3.7.2.3 Nomenclature Assignment. The nomenclature assignment shall be provided by the Government. The nomenclature shall be “Oxygen Clean Low Pressure Calibrator”.

3.7.2.4 Item Unique Identification (IUID). DFARS clause 252-211.7003 is invoked. A two dimensional IUID data matrix conforming to MIL-STD-130 shall be included on the identification plate.

3.8 Environmental Requirements. The OCLPC environmental performance requirements shall be as specified below in 3.8.1 Warm-up through 3.8.10 Acoustic Noise. It shall conform to the specified performance when subjected to the environmental conditions of this specification.

3.8.1 Warm-up. The OCLPC shall comply with the specified performance requirements after a 10 minute warm-up period preceded by a 1 hour not operating temperature stabilization period.

3.8.2 Temperature and Humidity. The temperature ranges and humidity limits for both operating and not operating conditions shall be as specified below in 3.8.2.1 Temperature not operating through 3.8.2.3 Humidity. A RH of 95 percent (with the applicable tolerance) does not include conditions of precipitation.

3.8.2.1 Temperature, not operating. The OCLPC shall conform to the specified performance and accuracy requirements after being stored in the transit case at temperatures ranging from -40 ºC to 71 ºC.

3.8.2.2 Temperature, operating. The OCLPC shall conform to the specified performance and accuracy while being operated at temperatures over the range of 0 ºC to 50 ºC.

3.8.2.3 Humidity. The OCLPC shall conform to the specified performance and accuracy for conditions where the relative humidity is 5 to 95 %RH, over the temperature range 10 to 50 ºC. At temperatures below 10 ºC, the humidity is uncontrolled, but the equipment shall conform to the specified performance and shall withstand the effects of humidity up to 100 %RH.

3.8.3 Altitude. The OCLPC components shall conform to the specified performance and accuracy requirements after being subjected to altitudes typically experienced during air transport, while not operating.

3.8.4 Vibration. Vibration shall be as specified below in 3.8.4.1 Bounce, loose cargo.

3.8.4.1 Bounce, loose cargo. The OCLPC shall conform to the specified performance and accuracy requirements after being tested in accordance with MIL-PRF- 28800F paragraph 4.5.5.3.3 Loose cargo bounce test.

3.8.5 Shock, mechanical. The mechanical shock requirements shall be as specified below in 3.8.5.1 Shock, functional through 3.8.5.3 Bench handling.

3.8.5.1 Shock, functional. The OCLPC shall conform to the specified performance and accuracy requirements after being subjected to the 30g half-sine shock test of MIL-PRF-28800F paragraph 4.5.5.4.1 Functional shock test.

3.8.5.2 Transit Drop. The OCLPC shall conform to the specified performance and accuracy requirements after being tested in accordance with MIL-PRF-28800F paragraph 4.5.5.4.2 Transit drop test. The equipment shall remain inside the transit case throughout this test.

3.8.5.3 Bench Handling. The OCLPC shall conform to the specified performance and accuracy requirements and there shall be no damage to any controls, indicators, or fuse holders after being tested in accordance with MIL-PRF-28800F paragraph 4.5.5.4.3 Bench handling test.

3.8.6 Water Resistance. The OCLPC enclosure and cover shall provide a water resistant barrier to protect the internal components if exposed to rain.

3.8.7 Fungus Resistance. Equipment, enclosure, and transit case(s) shall not contain materials that provide nutrients for the growth of fungus.

3.8.8 Salt Atmosphere. Salt atmosphere shall be as specified below in 3.8.8.1 Exposure, enclosure and 3.8.8.2 Exposure, structural.

3.8.8.1 Exposure, enclosure. The OCLPC shall conform to the specified performance and accuracy requirements after being tested for exposure in accordance with MIL-PRF-28800F paragraph 4.5.6.2.1 Salt fog test, enclosure.

3.8.8.2 Exposure, structural. Material used for the fabrication of panels and structural parts shall conform to all applicable requirements after being exposed for 48 hours to a 5 percent salt atmosphere in accordance with MIL-PRF-28800F paragraph 4.5.6.2.2 Salt fog test, structural parts.

3.8.9 Dust Exposure. Equipment enclosure with cover shall provide protection for the OCLPC from dust exposure.

3.8.9.1 Dust exposure, hard transit cases. Equipment in hard transit cases shall conform to all requirements after exposure to dust when tested in accordance with MIL-PRF-28800F paragraph 4.5.6.4 Dust resistance test, Class 1 and hard transit cases.

3.8.10 Acoustic Noise. The OCLPC shall not generate acoustic noise in excess of 70 dBA sound pressure level (SPL) when measured at the operator and bystander positions, in accordance with ISO 7779.

3.9 Performance Requirements. The OCLPC shall conform to the performance requirements listed below.

3.9.1 Measurement Range and Uncertainty. The OCLPC shall be capable of measuring both gauge and absolute pressure from -13.2 to 200 psig (1.5 to 214.7 psia). The measurement uncertainties over this range shall meet or exceed those listed below.

Pressure Range Measurement Uncertainty -13.2 P < -4.0 psig ±0.004 psi -4.0 P 200.0 psig ±0.05% of reading or 0.001 psi, whichever is greater

Note:

For absolute pressure measurements, the percent of reading uncertainty shall be calculated based on the equivalent gauge pressure. For the purposes of this CSS, assume atmospheric pressure to be 14.7 psia. For example:

Test point: 12.7 psia Equivalent gauge pressure: 12.7 psia – 14.7 psia = -2.0 psig Measurement uncertainty: ±0.05% · (-2.0 psig) = ±0.001 psi

3.9.2 TI Types. The OCLPC shall be capable of supporting the following types of pressure measuring instruments:

a. Analog pressure gauges

b. Digital pressure gauges

c. Pressure transducers (onboard voltage measurement not required)

d. Pressure switches (onboard continuity detection required)

3.9.3 Pressure Generation and Control. The OCLPC shall be capable of generating and controlling pressure (and vacuum) over the entire range specified in

3.9.1 Measurement Range and Uncertainty. All pressure and vacuum generating components shall be oil free.

3.9.4 Pressure Measurement. The OCLPC shall be capable of measuring pressure in the following two situations:

a. When pressure or vacuum is generated and controlled by the OCLPC.

b. When pressure or vacuum is generated and controlled by the TI.

3.9.5 Pressure Medium. The OCLPC shall be designed for use with compressed Nitrogen when pressure is controlled by the OCLPC. When pressure is generated and controlled by the TI, the OCLPC may also be exposed to clean, dry air. Navy calibration methods do not require the use of nor exposure to Oxygen.

3.9.6 Pressure Sensors. A maximum of three (3) modular/removable sensors is acceptable to meet the range and uncertainty requirements of paragraph 3.9.1 Measurement Range and Uncertainty.

3.9.7 Pressure Indicator. The pressure indicator comprises the main measurement component and display. This may include modular/removable sensor modules, depending on the design.

3.9.7.1 Display. The display shall meet the requirements of 3.3.4 Front panel display indicators. In addition, the display shall be alphanumeric and contain backlight capabilities. Minimum character height shall be 0.3 inches. It shall be capable of displaying over the entire range with a display resolution as specified in paragraph 3.9.5.2 Display resolution for all units of measure specified in 3.9.5.3 Units of measure.

3.9.7.2 Display Resolution. The OCLPC display resolution shall provide one decimal place more than the measurement uncertainty specification at a given test point.

Example: Test Point: 2 psig; Uncertainty: ±0.001 psi; Resolution: 0.0001 psi

3.9.7.3 Units of Measure. The OCLPC shall be capable of displaying at least the following units of measure over the entire range specified in 3.9.1 Measurement Range and Uncertainty. Unit conversions shall comply with NIST Special Publication 811.

a. pound-force per square inch gauge (psig)

b. pound-force per square inch absolute (psia)

c. inches of mercury gauge (inHg) (32 °F, 60 °F, and “Conventional”)

d. inches of mercury absolute (inHg abs) (32 °F, 60 °F, and “Conventional”)

e. millimeters of mercury gauge (mmHg) (“Conventional”)

f. millimeters of mercury absolute (mmHg abs) (“Conventional”)

g. inches of water gauge (inH2O) (39.2 °F, 60 °F, and “Conventional”)

h. inches of water absolute (inH2O abs) (39.2 °F, 60 °F, and “Conventional”)

i. feet of sea water (FSW)1

j. user defined 1 Conversion factor defined by US Navy Diving Manual: 1 psi = 2.25 FSW. FSW is by nature a gauge pressure measurement, where 0 psig = 0 FSW. Further conversion to psia requires addition of atmospheric pressure.

3.9.8 Temperature Compensation. The pressure indicator and optional sensor modules may include temperature compensation over the operating temperature range to achieve the required measurement uncertainty specification.

3.10 Accessories. The following accessories specified in 3.10.1 Equipment Connections through 3.10.4 Adapter Accessories shall be provided with each OCLPC.

3.10.1 Equipment Connections. The use of either quick disconnect or SAE AS4841 37° flare fittings is acceptable for OCLPC component interconnections and hoses. The AS4841 1/4 inch flare fitting is referred herein as an “AN4” fitting with a dash suffix indicating the flare (-F) or cone (-M) termination. All connections shall include a tethered cap or plug capable of sealing the port when not in use. Connections shall conform to the oxygen cleaning requirements specified in 3.11.3 Cleaning for oxygen service.

3.10.2 Hose Assemblies. OCLPC hose assemblies shall conform to the oxygen cleaning requirements specified in 3.11.3 Cleaning for oxygen service. They shall include an indelible label with the manufacturer CAGE, part number, length, and proof pressure. NOTE: The goal is quick assembly and disassembly minimizing thread damage from over tightening.

3.10.2.1 Hose Requirements. The hose shall withstand a minimum working pressure of 200 psig and proof pressure of 800 psig. The hose inside diameter shall not exceed 0.130 inches diameter. The hose shall function at proof pressure with a bend radius of 1.5 inches or less. The hose must not collapse under 29 inch Hg vacuum.

3.10.2.2 Hose Inventory. Hoses meeting the specification above shall be supplied in the following count and lengths.

Qty Length 2 ea. 24 Inches 2 ea. 48 Inches 1 ea. 72 Inches

3.10.3 Calibration Accessories. The OCLPC shall include any accessories required to calibrate the digital display unit and modules.

3.10.4 Adapter Accessories. The OCLPC shall include the following adapters and fittings to support various test setups and connections to the TI.

3.10.4.1 Adapter Inventory. At a minimum, the following adapters and fittings shall be included. No special marking or labels are required.

Qty Description

1 ea. 1/4-18NPT-M to OCLPC Connection, Adapter

1 ea. 1/4-18NPT-F to OCLPC Connection, Adapter

1 ea. 1/8-27NPT-M to OCLPC Connection, Adapter

1 ea. 1/8-27NPT-F to OCLPC Connection, Adapter

1 ea. AN4-M to OCLPC Connection, Adapter

1 ea. AN4-F to OCLPC Connection, Adapter

1 ea. AN6-M to OCLPC Connection, Adapter

1 ea. AN6-F to OCLPC Connection, Adapter

2 ea. Electrical leads for switch testing

3.10.4.2 Adapter Case. A small non-organic box or case is required to organize and store the adapters and fittings when not in use. The case shall have a dedicated storage space within the enclosure/transit case.

3.11 Maintainability. Maintainability shall be as specified below in 3.11.1 Fault Isolation through 3.11.6 Firmware Updates.

3.11.1 Fault Isolation. The design of the equipment shall permit isolation of faults, and repair down to the component item or Shop Replaceable Assembly (SRA) with the maintenance provisions furnished. Refer to MIL-PRF-28800F paragraph 6.5.2.18 Non-repairable subassembly for a definition of a non-repairable subassembly.

3.11.2 Preventive Maintenance. Preventive maintenance shall not require more than 60 minutes per 30-day period. Preventive maintenance shall not void the calibration of the OCLPC.

3.11.3 Cleaning for Oxygen Service. The OCLPC design shall allow for periodic cleaning and verification to the cleanliness levels shown in the Acceptance Criteria of Table X of MIL-STD-1330D. The OCLPC design shall not trap solvents and shall allow for verification that solvents have been removed. The design shall allow for a cleaning process as specified in 3.11.3.1 Cleaning solvents through 3.11.3.4 Wetted surfaces.

3.11.3.1 Cleaning Solvents. All wetted materials of the OCLPC as well as all surfaces that are exposed to the environment during use or transport shall be compatible with the solvents specified in a through d. Compatibility assessments, including test methods and results, shall be furnished to the government and are subject to review and approval.

a. Trichlorotrifluoroethane, CFC-113 Type I, II. As specified in MIL-C- 81302D.

b. Methoxy-nonafluorobutane, HFE-7100, 3M™ Novec™ Engineered Fluid 7100.

c. Methyl Nonafluorobutyl Ether in an azeotrope formulation with trans-1,2-dichloroethylene, HFE-71DE, 3M™ Novec™ Engineered Fluid 71DE.

d. Trans-1-chloro-3,3,3-trifluoropropene, Honeywell Solstice® Performance Fluid.

3.11.3.2 Solvent Flushing. The OCLPC shall be designed such that solvent can be flushed through its internal piping. All wetted surfaces of the OCLPC to which TIs are exposed, including pressure sensing devices, shall be contacted by the solvent during the flush.

3.11.3.3 Outer Surfaces. All surfaces of the OCLPC shall be compatible with brief, but frequent exposure to long wave ultraviolet (UV) light with a wavelength of 3400 to 3800 Angstroms (340 to 380 nm). This includes any paints or protective coatings applied to the surface.

3.11.3.4 Wetted Surfaces. The OCLPC shall have a known internal volume and surface area which includes all wetted surfaces, including those of the permanently installed connectors specified in paragraph 3.10.1 Equipment connections.

3.11.4 Washability. The equipment shall conform to all requirements after being washed, and there shall be no evidence of deterioration when tested in accordance with MIL-PRF-28800F paragraph 4.5.7.1.2 Washability test.

3.11.5 Maintenance Provisions. Equipment shall be as specified in 3.11.4.1 Accessibility for maintenance through 3.11.4.4 Adjustment/Alignment to facilitate maintenance:

3.11.5.1 Accessibility for Maintenance. The equipment shall be designed to ensure that any necessary maintenance access can be accomplished utilizing non-proprietary tools. The equipment shall be constructed so that no damage to any component shall occur and no permanent distortion to any structural member shall be caused during maintenance and calibration (performance verification and adjustment/alignment).

3.11.5.2 Maintenance and Calibration Aids. If required, circuit board extenders, special adapters, special tools, and patch or interface cables required for maintenance or calibration shall be provided. They shall be identified as a set with a unique part number. Stowage shall be in a reusable pouch or container.

3.11.5.3 Accessibility for Repair. The equipment shall be designed so that SRAs can be removed without removing other hardwired subassemblies or components.

There shall be no need to unsolder cables or interconnecting wiring to remove SRAs. Assemblies designed primarily to distribute power and signals to other components are excluded from this requirement. When troubleshooting/repair information is provided and access to both sides of SRA is necessary, the design of the equipment shall facilitate this directly or through extender cards.

3.11.5.4 Adjustment/Alignment. The equipment shall be provided with any necessary instructions/software (to include programming commands) needed to adjust/align the equipment so that the equipment meets its performance specifications after repair or due to the equipment failing calibration.

3.11.5.4.1 Accessibility for Adjustment. The equipment design shall permit adjustments of components that are changeable without removing any component, printed circuit cards, or subassembly. The use of extender cards is permitted.

Example: Access will be provided to potentiometers that control the accuracy of specified parameters.

3.11.5.4.2 Alignment Instructions/Software. If the equipment has alignment data stored in memory (example: EEPROM, data files, DACs, etc.) that is necessary for the equipment to meet its performance specification and modification of this alignment data is necessary after repair or a calibration failure, the equipment shall be designed and information provided so that the alignment can be performed by the Navy. The alignment process shall be able to use existing Navy calibration standards to satisfy a traceable calibration.

This alignment information provided shall include any necessary software (preferably software commands) usable via any allowable communications interface in 3.4 Digital Interface and usage instructions required to perform an alignment (to include any necessary setup instructions and/or software commands to put the equipment into the alignment mode, instructions and/or software commands necessary to gather new alignment data, along with any software algorithms required to format the alignment data into the appropriate data required by the equipment, and instructions and/or software commands necessary to reprogram the equipment with the new alignment data).

If software is required for the alignment process, preference will be given to software that uses current Navy calibration standards without modification (or the modification must be able to be performed by the Navy). Alternatively, if the software will not use Navy calibration standards without modification and modification by the Navy is not possible, preference will be given if the manufacturer supplies the explicit instructions and/or software commands and any necessary algorithms for the Navy to develop its own organic alignment support using existing Navy calibration standards.

3.11.5.4.3 Accessibility for Adjustment. The equipment design shall permit adjustments of components that are changeable without removing any component, printed circuit cards, or subassembly. The use of extender cards is permitted.

Example: Access will be provided to potentiometers that control the accuracy of specified parameters.

3.11.5.4.4 Alignment Instructions/Software. If the equipment has alignment data stored in memory (example: EEPROM, data files, DACs, etc.) that is necessary for the equipment to meet its performance specification and modification of this alignment data is necessary after repair or a calibration failure, the equipment shall be designed and information provided so that the alignment can be performed by the Navy. The alignment process shall be able to use existing Navy calibration standards to satisfy a traceable calibration.

This alignment information provided shall include any necessary software (preferably software commands) usable via any allowable communications interface in 3.4 Digital Interface and usage instructions required to perform an alignment (to include any necessary setup instructions and/or software commands to put the equipment into the alignment mode, instructions and/or software commands necessary to gather new alignment data, along with any software algorithms required to format the alignment data into the appropriate data required by the equipment, and instructions and/or software commands necessary to reprogram the equipment with the new alignment data).

If software is required for the alignment process, preference will be given to software that uses current Navy calibration standards without modification (or the modification must be able to be performed by the Navy). Alternatively, if the software will not use Navy calibration standards without modification and modification by the Navy is not possible, preference will be given if the manufacturer supplies the explicit instructions and/or software commands and any necessary algorithms for the Navy to develop its own organic alignment support using existing Navy calibration standards.

3.11.6 Repair. Maintenance instructions shall be furnished to facilitate the replacement of SRAs and subsequent testing procedures to ensure the performance of the SRA or the repair action taken. (See MIL-PRF-28800F paragraph 6.5.2.18 Non-repairable subassembly for guidance when a subassembly may be deemed non-repairable to aid in the identification of SRAs that can be repaired/replaced.)