Emerson Process Management OXYMITTER 4000 Alarms O2 Cell Bad, Fault 11, Bad Cell

Hazardous Area Oxymitter 4000

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

CALIBRATION RECOMMENDED

Instruction Manual

IB-106-340C Rev. 4.1

July 2004

k. Fault 11, Bad Cell

Figure 8-13shows the electronic assembly

for a Hazardous Area Oxymitter 4000 with

a membrane keypad (upper view) and a

Hazardous Area Oxymitter 4000 with an

LOI (lower view).

Membrane Keypad. When Fault 11 is

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

detected, the O2 CELL flashes three times,
pauses for three seconds, and repeats.
1.	The bad cell alarm activates when the
	cell exceeds the maximum resistance
	value.
2.	The cell should be replaced. See para-
	graph 9-4h,Cell Replacement, for cell
	replacement instructions.

KEYPAD

LOI. When Fault 11 is detected, the LOI displays the “O2 Cell Bad” message. Refer to the comments and procedures in para- graphs 1 and 2 above.

Alarms

O2 Cell Bad

8

LOI 37260029

Figure 8-13. Fault 11, Bad Cell

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-15