Emerson Process Management IB106-340 instruction manual Fault 10, High Cell mV

Oxymitter 4000

	HEATER T/C
DIAGNOSTIC	HEATER	SW2
ALARMS	O2 CELL	ON
	CALIBRATION

CALIBRATION RECOMMENDED

Instruction Manual

IB-106-340 Rev. 2.4

April, 2001

j. Fault 10, High Cell mV

The O2 CELL flashes once, pauses for

three seconds, and repeats (Figure 7-10).

1. Using a multimeter, measure across

TP1+ to TP2-.

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

22220041

2.	If you measure 1.2 VDC, the cell wires,
	either orange or green, have become
	detached from the input.
3.	One possible cause is connector J1.
	The orange or green wire has come
	loose from the crimped connection.
4.	The platinum pad could also be at fault.
	The pad could have broken free from
	the back of the cell.
5.	Replace heater strut per paragraph
	6-7,Heater Strut Replacement. If

Figure 7-10. Fault 10, High Cell mV

necessary, replace the cell flange

assembly per paragraph 6-8,Cell

Replacement.

7

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 7-13