Emerson Process Management OXYMITTER 4000 instruction manual Fault 14, Invalid Constant

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

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

CALIBRATION RECOMMENDED

n. Fault 14, Invalid Constant

Figure 8-16shows 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 14 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 CALIBRATION LED flashes

twice, pauses for three seconds, and

repeats.

1. After a calibration has been performed,

the electronics calculates a cell con-

stant value.

2. If the cell constant value is outside of

the range, -4 mV to 10 mV, the alarm

will activate. See paragraph 9-2,Cali-

bration, and verify the last calibration

was performed correctly.

KEYPAD

3.	Power down the Hazardous Area
	Oxymitter 4000 and remove it from the
	stack.
4.	Replace the cell per paragraph 9-4h,
	Cell Replacement.

Alarms

O2 Cell Bad

LOI. When Fault 14 is detected, the LOI displays the “O2 Cell Bad” message. Refer to the comments and procedures in para- graphs 1 through 4 above.

LOI 37260032

Figure 8-16. Fault 14, Invalid Constant

8-18 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management