Operation Manual

Job Card No.:
Engine:
Filing No.:
Exhaust Gas Thermocouples
Testing
0178-48-10 1842
Job
Stop engine. Remove thermocouple (job 11.01.04). Carry out a comparative measurement either with a new
thermocouple or one that has been removed from an adjacent cylinder. Refit new or used thermocouple (job
11.01.04).
Comparative Test (see also Fig. of job 11.01.04)
Start engine and run up to working temperature. Pull
plug (5) out of socket (4). Connect mV meter to the
following point in socket 4:
Connection (1): negative lead (green)
Connection (3): positive lead (red)
Read off mV value.
Measure temperature of coupling socket (compari-
son point) and take mV value from table. Add both
mV values together and take exhaust gas tempera-
ture from table.
If the coupling socket has been removed from
the comparison point on engine, measure the
temperature of coupling socket and add same
to value of exhaust gas temperature.
Conversion Table: mV to °C
Using Thermocouple Leads NiCr
and Ni to DIN 43710
°C 0 10 20 30 40 50 60 70 80 90
0 0 0,40 0,80 1,20 1,61 2,02 2,43 2,85 3,26 3,68 mV
100 4,10 4,51 4,92 5,33 5,73 6,13 6,53 6,93 7,33 7,73 mV
200 8,13 8,54 8,94 9,34 9,75 10,16 10,57 10,98 11,39 11,80 mV
300 12,21 12,63 13,04 13,46 13,88 14,29 14,71 15,13 15,55 15,98 mV
400 16, 40 16,82 17,24 17, 67 18,09 18,51 18,94 19,36 19,79 20,22 mV
500 20,65 21,07 21,50 21,92 22,35 22,78 23,20 23,63 24,06 24,49 mV
600 24, 91 25,34 25,76 26 ,19 26,61 27,03 27,45 27,87 28,29 28,72 mV
© 1183
11.01.05
S/BVM 628
Compare table temperature with that indicated by
thermometer. Renew thermocouple if necessary.
Refit coupling (Job Card 11.01.04).
Testing
Carry out a comparative measurement if readings
between thermocouples differ widely or a thermo-
couple has entirely failed.
Job Card:
- 11.01.04
Tools:
- Standard tools
- mV meter
- Thermometer
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