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 B.  There is one water separator temperature sensor installed in each pack. It is in the downstream end of the water separator.
 TASK 21-51-30-706-001
 2.  Water Separator Temperature Sensor Resistance Check___________________________________________________
 A.  General
 (1)  This procedure is a check of the calibration of the sensor while the sensor is installed in the pack. Because you can not find the temperature of the sensor accurately while it is installed in the pack, this check is for system troubleshooting only.
 B.  Equipment
 (1)  Digital Multimeter, High Impedence (alternative)
 NOTE: The digital multimeter must be specifically selected to
____ minimize self-heating of the sensor element. The instrument must limit the current through the sensor to less than 100 microamperes. If you use resistance measuring instruments without this current-limiting feature you will get an error in resistance value due to self-heating of the sensor element.
 (2)  
Digital Multimeter, Hewlett Packard Model 3465A (alternative)

 (3)  
Thermometer (capable of measuring temperature in degrees F to an accuracy of plus or minus 1 degree F from -40 to 140 degrees F)

 C.  References
 (1)  AMM 12-31-31/201, Body Section 46 Access Door and Panels
 D.  Access
 (1)  
Location Zones
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

 (2)  
Access Panels
 3303 Left Air Conditioning Access Panel
 3403 Right Air Conditioning Access Panel

 

 E.  Prepare for the Resistance Check
 S 886-002
 (1)  Make sure the pack has been off for 20 minutes or until it is at ambient temperature.
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A
737-300/400/500MAINTENANCE MANUAL
 S 016-003
 (2)  
Open the applicable left or right air conditioning access panel, 3303 or 3403 (AMM 12-31-31/201).

 S 016-004

 (3)  
To do the check of the left (right) water separator temperature sensor, remove the left (right) 35 degree F controller, M223 (M224), in the forward end of the air conditioning bay.

 F. Do the Resistance Check of the Water Separator Temperature Sensor
 S 226-005
 (1)  
Go to the air conditioning bay and measure the ambient temperature near the water separator temperature sensor.

 S 976-006

 (2)  
Write down the temperature.

 S 486-007

 (3)  
To do the check of the left (right) water separator temperature sensor, connect the digital multimeter between pin 6 and pin 7 on the airplane connector, D706 (D708), for the left (right) 35 degree F controller.

 S 766-008

 (4)  
Write down the resistance in ohms that you measure.

 S 976-009

 (5)  
Find the temperature on Figure 602 that is nearest to the
 temperature that you wrote down.

 S 976-010

 (6)  
Compare the permitted range of resistance for that temperature to the resistance you wrote down.

 S 906-011

 (7)  
If the resistance is out of range, replace the sensor.

 G. Put the Airplane Back to its Usual Condition
 S 416-012
 (1)  If you did the check of the left (right) water separator temperature sensor, install the left (right) 35 degree F controller in the forward end of the air conditioning bay.
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737-300/400/500MAINTENANCE MANUAL
 S 436-013
 (2)  Close the equipment bay door for the air conditioning (AMM 12-31-31/201).
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