Emerson Process Management OXYMITTER 4000 instruction manual Fault 13, Invalid Slope

Hazardous Area Oxymitter 4000

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

HEATER T/C

DIAGNOSTIC HEATER

ALARMS O2 CELL CALIBRATION

CALIBRATION RECOMMENDED

SW2

ON

m. Fault 13, Invalid Slope

Figure 8-15shows 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

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

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

KEYPAD

Alarms

O2 Cell Bad

LOI 37260031

Figure 8-15. Fault 13, Invalid Slope

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% O2 ≈ 23 mV

0.4% O2 ≈ 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

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-17