Emerson Process Management IM-106-340 Alarms O2 Cell Bad, Fault 13, Invalid Slope

Instruction Manual

IM-106-340, Rev. 4.0

May 2006

Figure 8-15. Fault 13, Invalid Slope

Oxymitter 4000

Fault 13, Invalid Slope

Figure 8-15shows the electronic assembly for an Oxymitter 4000 with a membrane keypad (upper view) and an Oxymitter 4000 with an LOI (lower view).

HEATER T/C

DIAGNOSTIC HEATER

ALARMS O2 CELL CALIBRATION

CALIBRATION RECOMMENDED

SW2

ON

Membrane Keypad

When Fault 13 is detected, the CALIBRATION LED flashes once, pauses for three seconds,

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	J1
TP2
TP3
TP4	RED YEL GRN ORG

TP5

TP6

and repeats.

1. During a calibration, the electronics

calculates a slope value. If the value of the

slope is less than 35 mV/dec or more than

52 mV/dec, the slope alarm will be active

until the end of the purge cycle.

2. See "Calibration with Keypad" in Section 9:

Maintenance and Service. Verify the

calibration by carefully repeating it. Ensure

the calibration gases match the calibration

gas parameters. If you attach a multimeter

to TP1+ and TP2-, sample gas

KEYPAD

Alarms

O2 Cell Bad

LOI 37260031

measurements are:

8% O2 . 23 mV

0.4% O2 . 85 mV

3.Power down the Oxymitter 4000 and remove it from the stack.

4.Replace the cell per "Cell Replacement" in Section 9: Maintenance and Service.

LOI

When Fault 13 is detected, the LOI displays the "O2 Cell Bad" message. Refer to the comments and procedures in paragraphs 1 through 4 above.

8-19