Figure 8-15. fault 13, invalid slope -17, Hazardous area oxymitter 4000, Alarms o2 cell bad – Emerson Process Management OXYMITTER 4000 User Manual

Page 113: Instruction manual

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Instruction Manual

IB-106-340C Rev. 4.1

July 2004

Rosemount Analytical Inc. A Division of Emerson Process Management

Troubleshooting 8-17

Hazardous Area Oxymitter 4000

DIAGNOSTIC

ALARMS

TEST

POINTS

HEATER T/C

HEATER

O2 CELL

CALIBRATION

CALIBRATION RECOMMENDED

O2 CELL mV +

O2 CELL mv -

HEATER T/C +

HEATER T/C -

INC

INC

DEC

DEC

HIGH

GAS

LOW

GAS

CAL

TEST GAS +

PROCESS -

% O2

SW2

TP1

J1

TP2

TP3

RED

YEL

GRN

ORG

TP4

TP5

TP6

ON

37260031

Alarms

O2 Cell Bad

LOI

KEYPAD

Figure 8-15. Fault 13, Invalid Slope

m. Fault 13, Invalid Slope

Figure 8-15 shows 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 13 is

detected, the CALIBRATION LED flashes
once, pauses for three seconds, 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 paragraph 9-2, Calibration. 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 measurements are:

8% O

2

≈ 23 mV

0.4% O

2

≈ 85 mV

3. Power down the Hazardous Area

Oxymitter 4000 and remove it from
the stack.

4. Replace the cell per paragraph 9-4h,

Cell Replacement.

LOI. When Fault 13 is detected, the LOI

displays the “O2 Cell Bad” message. Refer
to the comments and procedures in para-
graphs 1 through 4 above.

8

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