Instruction Manual

IB-106-340 Rev. 3.0

December 2003

 

HEATER T/C

 

DIAGNOSTIC

HEATER

SW2

ALARMS

O2 CELL

ON

 

 

CALIBRATION

 

CALIBRATION RECOMMENDED

Oxymitter 4000

n. Fault 14, Invalid Constant

Figure 8-16shows the electronic assembly

for an Oxymitter 4000 with a membrane

keypad (upper view) and an Oxymitter 4000

with an LOI (lower view).

Membrane Keypad. When Fault 14 is de-

tected, the CALIBRATION LED flashes

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

twice, pauses for three seconds, and re-

peats.

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

Alarms

O2 Cell Bad

LOI

37260032

 

Figure 8-16. Fault 14, Invalid Constant

3.

Power down the Oxymitter 4000 and

 

remove it from the stack.

4.

Replace the cell per paragraph 9-4i,

 

Cell Replacement.

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

8-18 Troubleshooting

Rosemount Analytical Inc. A Division of Emerson Process Management