Emerson Process Management OXYMITTER 4000 Alarms Calib Failed, Fault 15, Last Calibration Failed

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

o. Fault 15, Last Calibration Failed

Figure 8-17shows 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 15 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

three times, pauses for three seconds, and

repeats.

1. The last calibration failed alarm acti-

vates when the slope and constant

values calculated are out of range and

the unit reverts to using the previous

calibration values.

2. The cell should be replaced. See para-

graph 9-4h,Cell Replacement, for cell

KEYPAD

replacement instructions.

LOI. When Fault 15 is detected, the LOI displays the “Calib Failed” message. Refer to the comments in paragraphs 1 and 2 above.

Alarms

Calib Failed

8

LOI 37260033

Figure 8-17. Fault 15, Last Calibration Failed

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-19