1 - Purchase Description.pdf

25M-323A-FL

May 12, 2025

Rev 5

PURCHASE DESCRIPTION

FOR

Laminar Flow Computer

1.0 SCOPE:

The requirement is for flow computers which shall be used with existing Air Force (AF) laminar flow elements (LFEs). For this Purchase Description (PD), the flow computer will be referred to as the Laminar Flow Computer (LFC) and Test Instrument as (TI). This LFC will replace the current AF LFC P/N: FCS-10A, manufactured by CME. This system is designed to operate in a variety of different scenarios: when the TI is upstream of the LFE with no valves in between the TI and the LFE; when the TI is calibrated at high pressures such that a valve is required to be between the upstream TI and downstream LFE; or when the TI is calibrated at below-atmospheric pressures where the TI is downstream of the LFE.

Additionally, the LFC pressure ports and temperature probe can be used to measure differential pressure, absolute pressure, and temperature without an LFE. The LFC is designed to make the comparison between its reading and the TI’s reading simple and objective. The LFC is portable and all of its components are stored in a one-piece portable device which also has space for storing flexible pressure tubing, temperature probe, power cord, and operator’s manual.

2.0 PERFORMANCE REQUIREMENTS:

2.1. Differential Pressure: The LFC shall measure LFE differential pressure from 0 to 15 inches of water @ 4 °C with an uncertainty of ±0.005 inches of water, or better.

2.2. Absolute Pressure: The LFC shall measure LFE absolute pressure, both upstream and downstream, from 1 to 20 psia with an uncertainty of ±0.01 psi. One of the readings may be calculated via differential pressure.

2.3. Temperature: The LFC shall measure LFE temperature from 50 to 100 °F with an uncertainty of ±0.3 °F.

2.4. Operating Temperature Range: The LFC shall meet performance requirements over an operating temperature range of at least 50 to 100 °F.

2.5. Operating Humidity Range: The LFC shall meet performance requirements over an operating humidity range of at least 10 to 95% RH.

2.6. LFC Flow Resolution: The LFC flowrate resolution shall be adjustable down to 0.1 sccm.

2.7. Flow Stability: When using the flow function, the LFC shall provide a clear visual indication that the flowrate is stable and that the data point can be taken. The stability limit magnitude shall be a change in flow rate (in flow units per amount of time) that is definable by the user.

2.8. Warm-Up Time: The LFC shall meet the requirements of this PD with a maximum warm up time of 20 minutes.

2.9. Flow Uncertainty: Measured flow rates shall have an uncertainty of ±1.5% of reading or less.

2.9.1. Measurement Stability: The accuracy of each measurement parameter shall remain in-tolerance for a period of 12 months.

3.0 FUNCTIONAL REQUIREMENTS:

Attachment 1

Rev 5

3.1. Measuring Flow: The LFC shall calculate and display LFE flowrate and when applicable make appropriate density or K-Factor corrections based on flowing conditions and TI designed/scaled or normally operated specifications. Density corrections are applied to the LFE’s outlet standard flowrate (see 3.8 Application of Density and Gas Correction Factors) such that the LFE calculated flowrate will be what the TI should read under calibration conditions. The user shall be able to develop and save test files on the LFC, which will walk the user step-by-step through a calibration and ultimately be able to store the Calibration Results to memory. The user shall also be able to measure flow without having to use test files.

3.1.1. Test Setup: A Test Setup will be created by the user based on their responses to a series of questions prompted by the LFC regarding the TI. Based on the responses to these questions, the LFC shall configure the display, identify appropriate LFE, make all necessary density corrections, etc. The following questions are provided in order to make clear the intention of the “question-and-answer” configuration approach. At a minimum, the following questions shall be asked of the user:

3.1.1.1. TI Flow Unit: The following questions are asked to the user in order to identify the TI’s flowrate and uncertainty. See 3.3 Flowrate Units for required supported flow units.

Standard/Mass or Actual Flow: Does the TI indicate in standard/mass flow or actual flow?

Standard Flow: If the TI indicates in standard flow, the user shall be prompted to identify the reference temperature and absolute pressure for which its standard flow is based upon (default values for reference temperature and absolute pressure will be 70 °F and 14.7 psia, respectively).

Basic TI Flowrate Unit: What is the basic TI flowrate unit? For example, liters per minute, cubic feet per hour, grams per second, etc. “Basic” means without regard to “standard” or “actual” references which are commonly used.

Full Scale: What is the magnitude of the TI’s full scale in the stated flowrate units?

TI Uncertainty: Is the TI’s uncertainty (i.e. allowable tolerance) in % of full scale or in % of reading? What is the magnitude of the TI’s uncertainty?

3.1.1.2. Density and Gas Correction Factors: The user shall be able to select from Rotameter, K-Factor, or None. See 3.8 Application of Density and Gas Correction Factors for appropriate formulas.

Calibration Gas: What is the calibration gas? See 3.8.1 Gas Density for required supported gases.

TI Designed/Scaled or Normally Operated Specifications: What is the TI’s designed/scaled or normally operated gas? What is the TI’s designed/scaled or normally operated temperature and absolute pressure (e.g. rotameters are typically designed/scaled for a specific temperature and pressure, and a turbine flowmeter is not designed/scaled for a specific temperature and pressure, therefore, normal operating conditions will be used)?

Rev 5

TI’s Outlet Pressure Measurement: Will the TI’s outlet absolute pressure be measured using 1) LFE absolute pressure (see 3.10.3.1.3 Entrance Factor for discussion about Entrance Factor considerations when using an LFE absolute pressure as the TI’s outlet absolute pressure), or 2) by user’s entry (user will use separate means to measure TI’s outlet absolute pressure; this option will apply when the TI is operated at high pressures where a valve is required to be between the TI and the LFE, or at below-atmospheric pressures where the TI is downstream of the LFE and flow is being generated by pulling a vacuum).

TI’s Temperature Measurement: Will the TI’s temperature be measured using 1) the LFE’s temperature measurement, or 2) by user’s entry (user will use separate means to measure TI’s temperature)?

3.1.1.3. Calibration Points

Progression: Will the TI be calibrated in ascending, descending, or ascending and descending order?

Increments: What are the number of and magnitude of flowrates over which the TI will be calibrated? (e.g. for a 100 SLPM TI calibrated at 25%, 50%, 75%, and 95% of full scale, the user would tell the LFC that there are four calibration points and that these points are 25, 50, 75, and 95 SLPM) Calibration points shall have the option of being entered in % of full scale values as well.

Warm-up/Exercise: A reminder to warm up the TI and standard shall appear on the display prior to taking the first calibration point and when a new LFE standard is connected to the system.

3.1.2. Rotameter Example: At a minimum, the LFC manual shall have a rotameter calibration example. This will include the physical setup of the TI and LFC/LFE, and a step-by-step example of how to configure the LFC Test File.

3.2. Display Screen(s): At a minimum, the LFC shall provide the information and data stated in the following paragraphs. If multiple screens are used, they will be accessed by the user with minimum keystrokes. Also, the user shall be able to press one key to “escape” back to the primary display screen.

3.2.1. Primary Display Screen Requirements: The primary run screen shall display, at a minimum, 1) active LFE, 2) calibration gas (will be identified by its name or recognizable abbreviation), 3) flowrate with units (when appropriate “A” for actual or “S” for standard shall be indicated, e.g. ALPM, SCFM), 4) flowrate rate of change, 5) an objective visual indication of flowrate stability, 6) an objective means to determine if the LFE is out of its calibration range (this can be satisfied by having the LFC “blank out”, “star out”, etc. the flowrate), and 7) an indication which identifies if density corrections are being made to the LFE flowrate based on user menu selections. Note: indicators such as that for flowrate stability and density correction may be integrated into the LFC other than through the primary display screen so long as they are visible to the user when the primary display is active.

3.2.2. Additional Display Screen Requirements:

1) LFE differential pressure (at a minimum in units of inches of water @ 4 °C),

2) upstream and downstream absolute pressures (at a minimum in units of psia), Rev 5

3) gas temperature (at a minimum in units of °F),

4) real-time C- and K-Factor values (see 3.10.3.1 C- and K-Factors),

5) gas density (at a minimum in units of lb/ft3), and

6) viscosity (at a minimum in units of micropoise). If other units are available, they will be selected in a separate configuration menu.

3.3. Flowrate Units: Most common flowrate units shall be able to be defined by the user. The “volume” requirements are: cubic centimeters, liters, cubic meters, cubic inches, and cubic feet.

The “mass” requirements are: milligrams, grams, kilograms, and pounds. Each of the volume and mass units shall be capable of being defined with a time base of seconds, minutes, and hours. All volumetric measurements included shall have the capability of reading in the equivalent standard unit and referenced to pressure and temperature conditions configurable by the user.

3.4. TI Absolute Pressure: The LFC shall be able to measure the absolute pressure at the outlet of the TI (see 3.10.3.1.3 Entrance Factor for information on existing LFC Entrance Factor approach to determining TI outlet absolute pressure). The LFC shall also allow the user to enter the absolute pressure manually during a calibration. The TI outlet absolute pressure shall be used for appropriate density corrections (see 3.8 Application of Density and Gas Correction Factors).

3.5. TI Temperature: The LFC shall be able to measure the temperature of the flowing gas; this value shall be used as the temperature at the outlet of the TI. The LFC shall also allow the user to enter the temperature of the gas manually during a calibration. The TI outlet temperature shall be used for appropriate density corrections.

3.6. Differential Pressure Zeroing: The LFC shall allow the user to zero the differential pressure measurement being made across the LFE through front panel control.

3.7. LFE Actual Flowrate: The LFE flowrate at the LFE outlet is calculated based on the calibration factors for the LFE being used and the flowing conditions of the gas. LFE Actual Flowrate is calculated as: where K-Factor is determined as a function of C-Factor and the K- Factor vs. C-Factor calibration curve, ΔP = LFE differential pressure in units of inches of water @ 4 °C, α = linear coefficient of thermal expansion of the LFE material, 9.6x10-6, in units of inch/inch/°F, ΔT = temperature at calibration minus 70 °F in units of °F, µ = gas viscosity in units of micropoise (µP). The LFC shall be capable of calculating LFE flowrate with the following gases at a minimum: Air, Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, and Oxygen.

3.8. Application of Density and Gas Correction Factors: The following sections pertain to density and gas correction factors for when calibrating a TI that is designed/scaled or normally operated in a different gas and/or pressure and/or temperature other than which it is being calibrated. 3.8.2 Rotameter Density Correction and 3.8.3 Gas Correction Factor (K-Factor) use the LFE’s flowrate as a true mass flowrate (e.g. mg/s, pph) to which density corrections will be applied (the LFE’s true mass flowrate is calculated based on the LFE’s actual flowrate at the LFE outlet and the density at the LFE outlet). Once the density correction or gas correction factor is applied to the LFE’s true mass flowrate, the resultant value will then be converted to the TI’s flowrate units (see 3.3 Flowrate Units); this is the value that will be compared to what the TI is indicating. When “None” is selected (see 3.1.1.2 Density and Gas Correction Factors), the LFE’s true mass flowrate will be converted to the TI’s flowrate units and this is the value that will be compared to what the TI is indicating.

Rev 5

3.8.1. Gas Density: When the LFC is calibrating a TI that is designed/scaled or normally operated in a gas other than that which the LFEs are calibrated for, the LFC shall be able to determine the proper density at flowing pressure and temperature. The minimum required gases that shall be supported by the LFC are: Air, Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, and Oxygen.

3.8.2. Rotameter Density Correction: When the user identifies calibration of a rotameter (see

3.1.1.2 Density and Gas Correction Factors), a density correction shall be made as follows:

Mass FlowROTAMETER = Mass_FlowLFE*[density(TI designed/scaled or normally operated conditions)/density(during calibration)]1/2.

3.8.3. Gas Correction Factor (K-Factor): When the user identifies calibration of a TI which requires use of a K-Factor (i.e. mass flowmeter) (see 3.1.1.3 Density and Gas Correction Factors), the LFE shall perform the following: 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐹𝐹𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷= 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐷𝐷𝐷𝐷𝐹𝐹𝐷𝐷𝑆𝑆𝑆𝑆𝐷𝐷𝐷𝐷 𝑈𝑈𝑈𝑈𝐷𝐷𝑆𝑆𝐷𝐷*

K_FACTOR.

3.9. Remote Communications:

3.9.1. RS232 and USB: The LFC shall come with a RS232 and USB port for remote communications. RS232 and USB cables shall be provided with each LFC in order to connect the LFC to a personal computer.

3.9.2. USB: There shall be at least one integrated USB Ver 2.0 compliant port.

3.9.3. Communication with LFC: The user shall be able to remotely query the LFC to read the following LFC measurements using both RS232 and USB between the LFC and a personal computer, at minimum: absolute pressure, differential pressure, and temperature. All commands shall be provided in the operator’s manual.

3.9.4. Firmware Updates: All firmware updates shall be updateable via RS232 or USB.

3.10. Calibration Requirements:

3.10.1. Calibration of LFC Pressure and Temperature Sensors: The LFC pressure and temperature sensors shall be calibrated while in place within the LFC; no components shall require removal for calibration. Temperature probes shall be sealed to prevent contamination and allow calibration in a water bath.

3.10.1.1. Adjustment of LFC Pressure and Temperature Sensors: The pressure and temperature sensor measurements shall be adjusted by way of zero and span coefficients. Following calibration of the pressure and temperature sensors, the user can determine the new zero and span coefficients and enter the new values through the LFC front panel. A calibration and adjustment procedure shall be provided in the manual.

3.10.2. LFE Calibration Data: LFEs are calibrated at the AFPSL and calibration values are calculated for each LFE. This data is provided to the PMEL end-user who shall be able to load all of the calibration data both automatically with a computer and manually through the LFC front panel or by other acceptable means.

3.10.2.1. Nominal LFE Flowrate Ranges: The following table indicates the nominal LFE flowrate ranges.

Rev 5

LFE # Minimum (ALPM) Maximum (ALPM) 1 0.001 0.01 2 0.01 0.1 3 0.1 1 4 1 10 5 10 100 6 30 300 7 100 1000 8 200 2000

3.10.2.2. Aggregating and Loading LFE Calibration Data to a LFC: The LFC shall come with a software package which allows the AFPSL technician to create one calibration file which shall store the calibration data for the set of LFEs calibrated for the PMEL end-user. This file shall be capable of being transferred by email, posted to the Internet, and burned onto a CD. The LFC shall allow the PMEL end-user to connect their LFC to a computer by RS232 and USB and load the calibration data automatically from the calibration file to their LFC.

3.10.2.2.1. Manual Loading of LFE Calibration Data to LFC: The user shall be able to load the LFE calibration data manually through the LFC front panel. The user shall also be able to load additional LFE’s for use (not part of the core set) manually by entering calibration data.

3.10.3. LFE Calibration Factors: The LFEs are calibrated at the AFPSL, and specific values are assigned that uniquely characterize each LFE. The following are a list of values which the Air Force currently assigns to a LFE using the existing LFC; however, with proper justification, others may be proposed for addition or deletion.

3.10.3.1. C- and K-Factors: For each LFE, 20 C- and K-Factor pairs are determined from calibration.

3.10.3.1.1. C-Factor: ( )

µ αρ TPFactorC ∆⋅⋅+⋅∆⋅ =− where ρ = density of gas in units of lbm/ft3, ΔP = LFE differential pressure in units of inches of water @ 4 °C, α = linear coefficient of thermal expansion of the LFE material, 9.6x10-6, in units of inch/inch/°F, ΔT = temperature at calibration minus 70 °F in units of °F, µ = gas viscosity in units of micropoise (µP).

3.10.3.1.2. K-Factor: ( )TP

QaFactorK α µ where Qa = actual volumetric flowrate at the LFE’s outlet in units of actual cubic feet per minute, µ = gas viscosity in units of micropoise (µP), ΔP = LFE differential pressure in units of inches of water @ 4 °C, α = linear coefficient of thermal expansion of the LFE material, 9.6x10-6, in units of inch/inch/°F, ΔT = temperature at calibration minus 70 °F in units of °F.

3.10.3.1.3. Entrance Factor: When using the LFC/LFEs for calibrating a TI, the TI is positioned upstream of the LFE and the TI’s outlet absolute pressure must be known for when density corrections are required. The absolute pressure at the outlet of the LFE is therefore not a realistic interpretation of the TI’s outlet

Rev 5 absolute pressure because of pressure drops across the LFE and across the upstream LFE flow conditioner. When the AFPSL calibrates a LFE, the pressure drop across the upstream flow conditioner is determined. This value, along with the pressure drop across the LFE is used to determine an Entrance Factor. Entrance Factor = Pentrance/ΔPLFE, where Pentrance is the differential pressure across the upstream flow conditioner pressure tap and the upstream LFE pressure tap and ΔPLFE is the differential pressure across the LFE. During the calibration of the LFE, the Entrance Factors at each calibration point are averaged so that there is only one Entrance Factor for each LFE. When a TI is being calibrated, its outlet absolute pressure is then determined as follows: TI Outlet Pressure = PLFE(outlet) + ΔPLFE*(1 + Ef)

3.10.4. Range: For each LFE, a low and high C-Factor limit is defined by the AFPSL.

3.11. Serial Number: The serial number of each LFE calibrated as part of a set is stored in the LFC.

3.12. Standalone Pressure Measurement: The LFC shall have the means to perform calibrations on other TIs in both differential pressure and absolute pressure as a calibration standard IAW the uncertainties listed in 2.1 Differential Pressure and 2.2 Absolute Pressure.

4.0 MECHANICAL & PHYSICAL REQUIREMENTS:

4.1. Dimensions and Weight: The LFC shall be a single, fully contained unit, and shall have a footprint of no greater than 2 ft2. The LFC, all accessories, and the manual shall be easily portable and moved around in one shipping/carrying case and shall weigh no more than 50 pounds in total.

4.2. Temperature Probe Size: The LFE temperature fitting accommodates a 3/16 inch diameter probe. The LFE temperature fittings are 3/16 inch pass-through type with a Teflon ferrule.

The temperature probe that comes with the LFC shall be provided accordingly and shall be approximately 3 inches in length. The temperature probe cable shall be at least 10 feet in length.

4.3. Pressure Fittings: The pressure taps on the LFC shall be male (for inlet pressure) and female (for outlet pressure). The LFE pressure taps are also male (for inlet pressure) and female (for outlet pressure). The LFC shall come with two 10 feet long pressure hoses with Parker© quick-connect fittings; one hose will have female fittings on both ends (used for inlet pressure connection between the LFC and LFE) and one hose will have male fittings on both ends (used for outlet pressure connection between the LFC and LFE). Quick-connect fitting part numbers are: 4Z-Q4VY-SS (male) and 4Z-Q4CY-SSP (female). These are the same fittings which are used on the LFEs. Other models which are compatible with the LFE pressure taps are acceptable.

4.4. Overpressure Protection: The LFC shall have an overpressure protection mechanism to protect the pressure transducers in the event of over-pressurization.

4.4.1. Safety: At minimum, a visual overrange alert shall be incorporated into the LFC.

4.5. Shipping/Carrying Case: Reusable case which shall hold the LFC and all accessories shall be provided with the LFC. The case shall be rugged, rigid, waterproof, and capable of withstanding shock and vibration from day-to-day shipping. The case will be inspected by the Air Force and shall be free from any defects (i.e. poor molding fabrication, loose materials, Rev 5 damaged or improperly assembled cases, peeling, or chipping of plating or finish, nicks or burrs of metal parts, and post molding warping) which affect the durability, strength, safety, or serviceability. The finish of exposed edges/surfaces shall be smooth and free of sharp or jagged edges.

4.5.1. Handle and wheels: The LFC shipping/carrying case shall have at least two heavy duty, chest-type, large bail handles. The case shall have wheels.

4.5.2. Temperature Range: The shipping/carrying case shall protect the LFC over a temperature range of -20°C to 70°C and concurrently over a humidity range of 0 to 100%.

4.5.3. Pressure Relief Valve: The case shall be provided with a valve to equalize air pressure inside of the case with the air pressure outside of the case. The valve shall be designed, positioned, and recessed on the case to prevent damage and accidental opening. A warning decal shall be placed on the front of the case describing the valve operation.

4.6. Display: At a minimum, the LFC shall have a 4 x 4 inch graphic display interface.

4.7. Front Panel Controls: All LFC functions shall be accessible through front panel controls.

Controls may be embedded in an electronic display in lieu of a physical keypad. In addition to front panel controls, an external keyboard and mouse may be provided, but both shall have wired USB connections.

4.8. Power Requirements:

4.8.1. AC Power: The LFC shall operate from an AC source of 100 to 120/ VAC at 50/60 Hz. A detachable power cord shall be provided with the LFC.

4.8.2. Electrical Safety: Documentation shall be provided to support how all electric safety considerations for the system have been addressed. The safety of all personnel shall be assured during any personnel conductive or non-conductive contact with the outside of the equipment, and during the changing of the fuse, with the power to the system and its components on. This documentation shall consist of a minimum of a citing of a UL or ANSI identified standard or equivalent United States Std that the equipment conforms to.

4.9. Individual Unique Identifier Designation: This item shall be clearly labeled with a model number, serial number, and manufacturer’s name. Unique item identification labeling shall follow Item Identification and Valuation requirements as stated in the contract.

4.10. Construction: The LFC shall be designed and constructed of materials that meet the requirements of this specification and in accordance with the best commercial practices for industry approved equipment. It shall be the contractor’s responsibility to assure the government that such design objectives as reliability, accuracy of operation, maintainability and ease of operation have been given due consideration in the manufacture of this equipment.

All parts such as buttons, switches, controls, connectors, etc., shall have proper clearance and adjustments. They shall work together so that the equipment shall supply the rated requirements without unnecessary strains or burdens to the user. They shall be able to withstand the conditions met in shipping, storage, installation, and services. All materials and parts of this equipment shall be capable of withstanding environmental testing requirements of this specification.

5.0 FIRMWARE REQUIREMENTS:

Rev 5

5.1. Firmware Identification: If applicable, all firmware used in conjunction with instrument shall be identified by Name, Version, and Date; to be displayed upon startup or located in an “About” menu in the firmware.

5.2. Firmware Warranty: The contractor shall warrant that the product meets this purchase description, is free from defects in design and operation, and will perform to stated specifications within this purchase description for the length of the equipment warranty.

5.2.1. The contractor (at no additional cost) shall update or replace the firmware product as necessary to correct any deficiencies identified in the firmware. Replacement firmware shall meet or exceed the requirements in this purchase description, shall not require additional training to operate, and shall be warranted for the remainder of the equipment warranty.

5.2.2. The contractor shall bear transportation costs for all replacement products.

5.2.3. The contractor (at no additional cost) shall provide technical support for normal firmware usage, clarification of documentation, and resolution of problems. The contractor shall have multiple methods for convenient contact of Technical Support. Contact methods may include but are not limited to on-line or telephone.

5.3. Interchangeability:

5.3.1. When firmware upgrade is anticipated by a manufacturer during the life of this contract, the contractor shall contact AFMETCAL for concurrence. If AFMETCAL concurs with the proposed upgrade, all previous units delivered under this contract shall be updated to this upgrade.

5.3.2. All firmware provided under this contract shall be at the same version, revision, and revision date at the completion of the contract.

5.3.3. Firmware shall be updateable by AFMETCAL through communication protocols with Windows based-PC or external drive. Instructions on how to perform the update and any required communication software shall be provided.

6.0 OPERATOR’S MANUAL: The operator’s manual shall include appropriate detail about LFC system features and capabilities and shall also include pertinent information as described in this purchase description. A calibration procedure shall also be illustrated within the LFC manual.

6.1. Calibration and Alignment Procedures: The manual shall include organic calibration (verification) and alignment procedures for calibrating and aligning the meters and any other component that requires periodic calibration. Any associated software required to align meter shall be provided.

6.2. Remote Command Listings: The manual shall list the input/output parameters, command strings and other pertinent data required to accomplish remote operation of the meters by means of a PC.

7.0 ENVIRONMENT, SAFETY, AND OPERATIONAL HEALTH: A combination of the system manual, other documentation, and/or the system itself shall identify potential environment, safety and operational health hazards and how they are mitigated when the design itself cannot mitigate them. This will be accomplished through stating the hazard and accompanying mitigation through

Rev 5 the use of safety devices, use of warnings, or use of special operational procedures to counter such hazards.

8.0 TESTING: The LFC will be inspected and accepted at a destination specified elsewhere in this contract. The item will be checked with test equipment and parameters equal to or better than those required assuring specified performance requirements are met. Test equipment used shall have first echelon certification directly traceable to the International System of Units through the National Institute of Standards Technology (NIST) or other approved equivalent international laboratory.

Tests will be performed to assure the item meets or exceeds all of the requirements of this purchase description. Such testing does not relieve the contractor of performing all inspections and quality control checks at the point of fabrication as necessary to assure performance as specified.

9.0 WARRANTY & TECHNICAL SUPPORT: A warranty & technical support normally offered by the vendor for this product shall be provided with the unit. The warranty shall last at least one year from delivery.

Attachment:

Data Requirements

25M-323B-FL

January 15, 2024

Rev 1

PURCHASE DESCRIPTION

FOR

Laminar Flow Element Cases

1.0 SCOPE:

In addition to the requirements outlined in the Purchase Description for Part A (25M-323A-FL), shipping cases are required for the existing laminar flow element (LFE) set and straighteners. Each LFE shipping case shall be capable of containing one full set of eight laminar flow elements, accompanying flow straighteners, and valves. The foam used in the cases shall be rigid foam with custom cutouts that allow for easy placement of LFE’s and flow straighteners. Generalized mock-ups of the LFE’s and flow straighteners are provided in this PD, but an actual set of meters will be loaned to the winning bidder to assist with final measurements of foam cutouts.

2.0 LFE SHIPPING CASES:

Each shipping case shall hold one set of eight LFE’s, accompanying straightener sections, and valves. The case shall be rugged, rigid, waterproof, and capable of withstanding shock and vibration from day-to-day shipping. Each case will be inspected by the Air Force and shall be free from any defects (i.e. poor molding fabrication, loose materials, damaged or improperly assembled cases, peeling, or chipping of plating or finish, nicks or burrs of metal parts, and post molding warping) which affect the durability, strength, safety, or serviceability. The finish of exposed edges/surfaces shall be smooth and free of sharp or jagged edges.

2.1. Handle and wheels: The LFC shipping/carrying case shall have at least two heavy duty, chest-type, large bail handles. The case shall have wheels.

2.2. Foam Material: The foam material used shall be rigid and resistant to degradation such as flaking, chipping, and decomposition.

2.3. Custom Cutouts: The foam inserts within each case shall be fabricated with cutouts specific to each component carried within the case.

2.4. Foam Tray Insert: Each case shall have a top and bottom foam tray. The top tray shall be removable and have straps/handles to assist easy removal and replacement.

2.5. Temperature Range: The shipping/carrying case shall protect the LFC over a temperature range of -20°C to 70°C and concurrently over a humidity range of 0 to 100%.

2.6. Pressure Relief Valve: The case shall be provided with a valve to equalize air pressure inside of the case with the air pressure outside of the case. The valve shall be designed, positioned, and recessed on the case to prevent damage and accidental opening. A warning decal shall be placed on the front of the case describing the valve operation.

2.7. Dimensions: The maximum allowable size of each case is 36” x 28” x 20” (LxWxH).

3.0 WARRANTY: A warranty normally offered by the vendor for this product shall be provided with the unit. The warranty shall last at least one year from delivery.

25M-323B-FL

January 15, 2024

Rev 1

APPENDIX:

Below is an example of a potential layout of the foam inserts mentioned in 2.4.

Attachment to Purchase Description

25M-323A/B-FL

Flow Computer

DATA REQUIREMENTS

MANUALS: A complete user and service manual and calibration procedure shall be provided with each unit in contractor format. Manuals shall be on CD/DVD-ROM in Indexed Portable Document Format (iPDF). The manuals shall comply with Data Item Description (DID) DI-TMSS-80527D and the Contract Data Requirements List (DD Form 1423).

REPAIRABLE ITEM INSPECTION REPORT: A COMPLETE REPAIRABLE ITEM INSPECTION REPORT SHALL BE PROVIDED ONCE AT THE END OF EVERY FISCAL YEAR (ONCE/IF WARRANTY REPAIRS BEGIN). THE REPORTS SHALL COMPLY WITH DATA ITEM DESCRIPTION (DID) DI-PSSS-80386 AND THE CONTRACT

DATA REQUIREMENTS LIST (DD FORM 1423).