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29--sensor,temperature, (OB1857816) (2007-02-05)

PR Number(s): 2915013432931PR, FA810406R0598 Item: 0001 NSN: 2915013432931PRPR
SENSOR,TEMPERATURE, P/N: 1534M60P04, Description: Temperature is sensed by a
helium-filled sensing coil acting upon sensing bellows attached to a metering
valve. A second bellows is reference bellows. Pressurized helium gas in
sensing coil reacts to temperature changes. When temperature increases, gas
pressure increases. When temperature decreases, gas pressure decreases.
Control servo pressure (PC) is supplied through a fixed orifice in main engine
control. Pressure between fixed orifice and metering valve is P6 Pressure.
Pressure (P6) is regulated to that required to overcome force of helium acting
on sensing bellows, plus force of preload springs, plus force of bypass
pressure (PD) acting on reference bellows. This interaction of forces
regulats P6 at a constant value above PD at a constant value above PD at a
given temperature. An increases in temperature expands helium gas in sensing
coil and sensing bellows. As sensing bellows expands, opening at metering
valve is decreased. A smaller amount of P6 is than blec to PD, thus
increasing P6 pressure. A temperature decrease in helium-filled sensing coil
causes gas to contract. As gas contracts, metering valve opens farther,
bleeding more P6 pressure to PD, and P6 pressure decreases. The reference
bellows allows for variations in PD and is used to maintain absolute pressure
reference. FUNCTION: The sensor is a temperature sensor and transducer unit
for main engine control. It responds to changes in fan discharge temperature
and regulates pressure as a function of discharge temperature.
DIMENSIONS: 'Sensor body/length 3.000inches, width 4.390 inches, height 2.400
inches. Temperature coil dimensions: length 7.188 inches, width 2.750 inches,
height 2.750 inches, weight (dry) 2.82 lbs, signal pressures 24.1-182.4 PSI
above main fuel pump boost pressure and proportional to temperature, filter
screen size 70 microns (nominal), pressure line connection0.562-18 UNF-3A
thread, temperature range -65F to 480F. MATERIAL: consists of aluminum
exterior surfaces anodized per MIL-L-8625 class I Type II. Total Line Item
Qty:10-20,21-32 Destn: FB2039,Tinker AFB,OK.,73145-9013. Delivery:
29DEC2006, 10.00 Destn: FB2039,Tinker AFB,OK.,73145-9013. Delivery:
29DEC2006, 21.00 Electronic procedure will be used for this solicitation.
To: WOODWARD GOVERNOR COMPANY, LOVES PARK, IL.,61111-5800. Specifications,
plans, or drawings relating to the procurement described are incomplete or not
available and cannot be furnished by the Government. See Note(s) 26.

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