Instruction Manual

IB-106-340 Rev. 2.4

April, 2001

 

HEATER T/C

 

DIAGNOSTIC

HEATER

SW2

ALARMS

O2 CELL

ON

 

 

CALIBRATION

 

CALIBRATION RECOMMENDED

Oxymitter 4000

c. Fault 3, Reversed Thermocouple

The HEATER T/C LED flashes three times,

pauses for three seconds, and repeats

(Figure 5-3).

1. Using a multimeter, measure TP3+ to

TP4-.

TEST

POINTS

INC INC

HIGH LOW

GAS GAS

DEC DEC

O2 CELL mV +

O2 CELL mv - HEATER T/C + HEATER T/C -

CAL

TEST GAS +

PROCESS -

% O2

TP1 TP2 TP3 TP4

TP5 TP6

J1 RED YEL GRN ORG

22220035

2.

If the reading is negative, the thermo-

 

couple wiring is reversed.

3.

Check red and yellow wires in the J1

 

connector for the proper placement.

4.

If the wiring is correct, the fault is in the

 

PC board. See paragraph 6-5b,Elec-

 

tronic Assembly Replacement.

Figure 7-3. Fault 3, Reversed Thermocouple

7-6 Troubleshooting

Rosemount Analytical Inc. A Division of Emerson Process Management

Page 104
Image 104
Emerson Process Management IB106-340 instruction manual Fault 3, Reversed Thermocouple