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Figure 8. Heater probe.
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TB-9-4920-454-35 Tester Exhaust Gas Temperature Howell Instruments Inc. Model BH112JB-( ) Manual
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Figure 9. Heater probe control circuit.

TB 9-4920-454-35
(6) Multimeter should indicate 0 V ac (±1.0); if not, verify equipment connection.
(Ensure that pins C and D are connected to multimeter.)
(7) Connect equipment as shown in figure 8, CONNECTION B.
(8) Set calibrator for an dc millivolt output corresponding to ambient temperature
as specified in table 3.
(9) Set TEMPERATURE switch to HEATER PROBE TEMP SET.
(10) Adjust PROBE CONTROL until TEMP oC indicator displays 100.
(11) Reverse leads at calibrator OUTPUT terminals.
(12) Set calibrator for a 4.10 mV dc, less ambient temperature millivolt equivalent,
output.
(13) PROBE POWER lamp should be flashing, if not, perform b (2) below.
(14) Adjust PROBE CONTROL until TEMP oC indicator displays 600.
(15) Set calibrator for a 24.91 mV dc, less ambient temperature millivolt equivalent,
output.
(16) PROBE POWER lamp should be flashing; if not, perform b (3) below.
(17) Turn PROBE CONTROL fully ccw.
(18) Disconnect calibrator from TI and connect heater probes as shown in figure 9.
(19) Adjust PROBE CONTROL until TEMP oC indicator displays 100.
(20) Set TEMPERATURE switch to OPERATE.
NOTE
If probe temperature exceeds set temperature, PROBE
POWER lamp will go out until probe temperature falls below
set temperature.  Wait until temperature begins to stabilize
(lamp flashes on and off regularly) before taking a reading.
WARNING
Do not touch heater probes as severe burns could result.
15

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