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 B.  This procedure does a check of the calibration of the sensor while the sensor is installed in the airplane. Because you can not find the temperature of the sensor accurately while it is installed in the duct, this test is for system troubleshooting only.
 TASK 21-61-41-706-014
 2.  Duct Temperature Sensor Check (Fig. 601)_____________________________
 A.  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)

 B.  References
 (1)  
AMM 21-61-41/401, Duct Temperature Sensors

 (2)  
AMM 25-21-45/401, Sculptured Ceiling Panels

 (3)  
AMM 25-52-73/401, Cargo Compartment Sidewall Lining

 C.  Access
 (1)  Location Zones
 107 Forward Half of Cabin
 210 Air Conditioning Distribution Bay

 D.  Prepare for the Resistance Check
 S 016-021
 (1)  
To do a test of the temperature limit sensor and anticipator sensor for the passenger cabin, remove the overhead ceiling panels (AMM 25-21-45/401).

 S 016-023

 (2)  
To do a test of the temperature limit sensor and anticipator sensor for the flight compartment, remove the center panel on the aft bulkhead in the forward cargo compartment.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TEMPERATURE (`F)  RESISTANCE (OHMS) 
-40  151,380 259,440-
-35  128,850 216,150-
-30  109,520 181,450-
-25  93,600 152,600-
-20  80,260 128,670-
-15  68,990 109,060-
-10  59,520-92,620 
-5  51,450-78,980 
0  44,630-67,510 
5  38,820-57,880 
10  33,860-49,760 
15  29,580-42,930 
20  25,940-37,110 
25  22,800-32,150 
30  20,070-27,960 
35  17,710-24,370 
40  15,650-21,310 
45  13,870-18,660 
50  12,320-16,380 
55  10,980-14,390 
60  9,800-12,690 
65  8,760-11,210 
70  7,850-9,920 
75  7,030-8,810 
80  6,300-7,840 

TEMPERATURE (`F)  RESISTANCE (OHMS) 
85  5,690-6,970 
90  5,150-6,200 
95  4,660-5,540 
100  4,220-4,950 
105  3,820-4,450 
110  3,460-4,000 
115  3,150-3,600 
120  2,860-3,260 
125  2,610-2,940 
130  2,380-2,660 
135  2,180-2,410 
140  1,990-2,190 
145  1,810-2,100 
150  1,650-1,840 
155  1,500-1,700 
160  1,370-1,560 
165  1,250-1,440 
170  1,140-1,330 
175  1,050-1,230 
180  965-1,130 
185  887-1,050 
190  815-969 
195  750-900 
200 691-837 

RESISTANCE TABLE

Duct Temperature Sensor - Temperature and Resistance Data
Figure 601 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E37010
A 737-300/400/500MAINTENANCE MANUAL

-40-30 -20 -10 0 10 20 30 40 50 60 70 80 90100 110 120 130 140 150 160 170 180 190 200
　
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