TB 1-4920-443-35
30. Fuel and Oil Tank Temperatures, Type-J (Iron-Const.) Thermocouple Channels
a. Performance Check
(1) Locate the oil tank in the doghouse on the fuel skid. Unplug Thermocouple connector that mates to
the probe on top of the oil tank, TC209. Connect Thermocouple calibrator to TC209 connector.
Calibrate Doric Ch. 25 and AEDATS OIL (TOILT) per the table below. Record the calibrated values
for each temperature set point.
(2) Locate the fuel temperature thermocouple (TC208) inside the doghouse on the fuel skid. Disconnect
thermocouple TC208. Connect Thermocouple calibrator to TC208 signal lines. Calibrate Doric- Ch.
26 and AEDATS fuel (TFUELT) per the table below. Record the calibrated values for each
temperature.
(3) Verify that the recorded temperatures from steps (1) and (2) are within the tolerances specified in
table 37 below. Record the calibrated temperature indications below.
NOTE
The T64 engine oil-tank thermocouple connector is on the engine test trailer, J207, pin A(+)
and pin B(-).
Table 30-1
Calibrator
DORIC
DORIC
DORIC
AEDATS
AEDATS
AEDATS
Set point
Tolerance
Ch. 25
Ch. 26
Tolerance
TOILT
TFUELT
Limits (2)
Limits (1)
32
30 34
31 33
100
98 102
99 101
200
198 202
199 201
300
298 302
299 301
31. Digital Temperature Indicator, Type-K (Chromel-Alumel) Thermocouple Channels
a. Performance Check (Doric and AEDATS Alignment for T700 Trailer)
(1) Using type Kx thermocouple wire, connect thermocouple calibrator to pins 17 (+) and 16 (-) of
connector E1 of the T700 Engine Control Cable, P/N 981AS622-1 (or 1003705). This cable runs from
the J-box to the T700 engine.
(2) Set thermocouple calibrator to Type K and ensure a 30 minute warm-up time. (Not required if using
Eurotron 2000T)
(3) Select Doric Channel 1 on the Type K thermocouple selector switch.
(4) Adjust the thermocouple calibrator for 400 F.
(5) Verify that the Type R Temperature Indicator is between 398 and 402 F. Adjust the ice point
potentiometer (R44) as necessary.
NOTE
To gain access to the TI Temperature Indicator alignment controls, remove the two screws
from the sides of the front panel and remove the panel. The two potentiometers are visible
at the upper left of the display. R44 (Front Panel ZERO) potentiometer controls the ice
point indication. R45 (SPAN) potentiometer controls the positive (+) full scale indication.
(6) Adjust the thermocouple calibrator for 2000 F output.
(7) Verify that the TI indicator indication is between 1998 and 2002 F. Adjust the indicator positive (+)
full-scale potentiometer (R45) as necessary.
NOTE
Interaction may occur between the TI temperature indicator ice point and positive (+) full
scale adjustment. Repeat steps 4 through 7 until no further adjustment is necessary.
(8) Adjust the thermocouple calibrator to obtain the temperature values listed. At each temperature value,
verify that the TI temperature indicator indication and AEDATS are within the tolerance limits listed.
