SON for RFQ Specs.pdf

STATEMENT OF NEED

Environmental Chamber

PR 142082-26-0374

PURPOSE

1.0 Procure an environmental chamber with a Nitrogen bottle.

MISSION

The Radar Operations Center (ROC) Hardware Engineering team is responsible for testing of WSR-88D equipment in certain conditions. These conditions are outlined in each piece of equipment’s specification document. As we conduct rigorous testing, an environmental chamber is needed to simulate the range of conditions in which the equipment is expected to operate. In particular, the environmental chamber should be capable of accurately controlling both temperature and humidity. The temperature range that equipment must operate in the radome is from -40 deg C to +49 deg C, and the relative humidity range is from 15% to 95%.

TECHNICAL SPECIFICATION:

1.0 CLIN 0001: Total quantity 1; Test Equity Chambers TE-123H or equivalent 120VAC environmental chamber.

1.1 Specification:

Temperature Range -68°C to +175°C Control Tolerance ±0.5°C (Short-term variations measured at the control sensor after stabilization) Uniformity ±1°C (Variations throughout the chamber after stabilization) Humidity Range Standard Range: 10% to 95% (Limited by a 6°C dewpoint and maximum dry bulb of +85°C)

With GN2 Purge or optional Dry Air Purge: 5% to 95% (Dry bulb range of +10°C to +85°C)

NOTE: Ability to reach RH extremes may be limited by the humidity sensor accuracy. Low Dew Point conditions can only be achieved when starting with a clean, dry chamber.

Control Tolerance ±3% RH (Measured at the control sensor after stabilization) Display Resolution

0.1% RH

Humidity Sensor Dynamic capacitive type (no wet wicks required)

Cool Down Transition Time* (uncontrolled humidity mode)

Start Temp

End Temp

+23°C 0°C -40°C -55°C -65°C -68°C

+23°C ----- 6 min 31 min 51 min 68 min Ultimate

+50°C 7 min 16 min 44 min 62 min 82 min Ultimate

+85°C 18 min 28 min 54 min 82 min 101 min Ultimate

+150°C 43 min 54 min 87 min 108 min 129 min Ultimate

Heat Up Transition Time* (uncontrolled humidity mode)

Start Temp

End Temp

+23°C +50°C +85°C +125°C +150°C +175°C

+23°C ----- 2 min 12 min 24 min 33 min Ultimate

0°C 3 min 9 min 18 min 32 min 41 min Ultimate

-40°C 9 min 16 min 25 min 39 min 48 min Ultimate

-55°C 14 min 18 min 31 min 44 min 53 min Ultimate

-65°C 15 min 21 min 32 min 45 min 54 min Ultimate

Rate Of Change To calculate the rate of change for a particular condition, take the difference between the Start Temp and End Temp and divide by the Transition Time.

Cool Down Example: From +85°C to -40°C = 125°C / 54 min = 2.3°C/min.

Heat Up Example: From -40°C to +85°C = 125°C / 25 min = 5.0°C/min.

*Note: Transition times are measured after a 2 hour soak at the respective start temperature with an empty chamber, as indicated on the temperature controller, 23°C ambient. Measured with setpoint beyond the start and end temperatures. Does not include the effect of proportional band when approaching setpoint. Measured at nominal line voltage of 120V, 60 Hz. Performance is reduced on 123H-EX 50 Hz export versions by 17%.

Live Load Capacity (uncontrolled humidity mode)

+23°C 0°C -40°C -55°C -65°C

500 Watts 400 Watts 225 Watts 175 Watts 100 Watts

Refrigeration and Heating System

High Stage Refrigerant

R-404A (Dupont HP-62)

Low Stage Refrigerant

R-508B (Dupont SUVA-95)

Compressors 1/2 HP x 1/3 HP Tecumseh hermetic compressors in a cascade configuration.

Condenser Air Cooled

Heat of Rejection 5,000 BTUH (maximum rated chamber load at maximum cooling rate from high temperature soak)

Air Heater Power 1,000 Watts (500 Watts when compressors are running)

Humidifier Heater Power

750 Watts

Instrumentation

Temp/Humidity Controller

Watlow F4T Touch Screen Controller with RS-232, Ethernet interface, 4.3" color graphic touch screen. OR...

Watlow F4 Controller with RS-232 interface, LED readout of temperature, LCD display of other parameters.

Limit Controller Independent high and low temperature limits. Triggers an audible alarm and shuts down the chamber. Relay contacts provide a safety power interlock for test sample.

Chart Recorder (Optional) Honeywell DR4300 Series. Two pen, 10" circular chart. Mounts in lower front door. 24-hour rotation.

Input Power Requirements

Input Voltage

123H North America Version:

120 V nominal (110 to 126 VAC), 60 Hz, 1 PH Max Current Draw 18 A, Recommended Minimum Service 20 A

Power Cord and Plug

6' Power cord supplied with a molded NEMA 5-20P plug.

Plugs into a standard NEMA 5-20R receptacle.

Use of an extension cord is not recommended.

Model 123H-EX export version is supplied with power cord for the destination country.

Humidity Water Requirements

Supply and Drain Must be provided with a water line and floor drain.

Negligible consumption.

Water Recirculation System (optional)

Provides a reliable supply of filtered water for the humidity system. Perfect for installations where a water line and drain are not available.

Physical Characteristics

Inside Dimensions 18" W x 16.5" H x 13.5" D (2.3 cubic feet)

Outside Dimensions 26" W x 63" H x 36.5 " D (nominal) The vent tube adds 3" to height.

Minimum Installed Clearance

6 " from the left and right side 12" from the rear

Window Viewing Area 7" W x 12 " H

Access Ports 4" Port on left and right side (two total) Supplied with foam plugs

Weight Chamber Weight: 520 pounds Shipping Weight: 635 pounds (North America only, contact us for export shipment)

Sound Level 62 dBA (A-weighted, measured 36" from the front)

NOTE: Performance is typical and based on operation at 23°C (73°F) ambient and nominal input voltage. Designed for use in a normal conditioned laboratory. Operation at higher ambient temperatures may result in decreased cooling performance. Additional ports and shelves will also affect performance. Operation above 30°C (85°F) or below 16°C (60°F) ambient is not recommended.

DELIVERY SCHEDULE

CLIN 0001: Total quantity 1, Test Equity Chambers TE-123H or equivalent.

Ship to:

National Weather Service/Radar Operations Center Attention: Clinton Maples

1200 WESTHEIMER DRIVE

NORMAN, OK 73069

POINT OF CONTACT:

Clinton Maples Radar Operations Center 1200 Westheimer Dr.

Norman, OK 73069

(405) 573-3493 lindsey.m.alberts@noaa.gov