Emerson 4000 LOI, KEYPAD, Membrane Keypad, m. Fault 13, Invalid Slope, Figure 8-15.Fault 13, Invalid Slope

Oxymitter 4000

Instruction Manual

IB-106-340 Rev. 3.0 December 2003

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 an Oxymitter 4000 with a membrane

keypad (upper view) and an Oxymitter 4000

with an LOI (lower view).

Membrane Keypad. When Fault 13 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	J1
TP2
TP3
TP4	RED YEL GRN ORG

TP5

TP6

once, pauses for three seconds, and re-

peats.

1. During a calibration, the electronics

calculates a slope value. If the value of

the slope is less than 35 mV/deg or

more than 52 mV/deg, 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.

KEYPAD

Alarms

O2 Cell Bad

LOI 37260031

Figure 8-15. Fault 13, Invalid Slope

Ensure the calibration gases match the

calibration gas parameters. If you at-

tach a multimeter to TP1+ and TP2-,

sample gas 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 paragraph 9-4i,

Cell Replacement.

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.

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