Emerson Process Management instruction manual Fault 14, Invalid Constant IM-106-340, Rev May

Oxymitter 4000

Figure 8-16. Fault 14, Invalid Constant

Instruction Manual

IM-106-340, Rev. 4.0

May 2006

Fault 14, Invalid Constant

Figure 8-16shows 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 14 is detected, the CALIBRATION LED flashes twice, 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.	After a calibration has been performed, the
	electronics calculates a cell constant value.
2.	If the cell constant value is outside of the
	range, -4 mV to 10 mV, the alarm will
	activate. See "Calibration with Keypad" in
	Section 9: Maintenance and Service, and
	verify the last calibration was performed
	correctly.
3.	Power down the Oxymitter 4000 and
	remove it from the stack.

KEYPAD

Alarms

O2 Cell Bad

LOI 37260032

4. Replace the cell per "Cell Replacement" in

Section 9: Maintenance and Service.

LOI

When Fault 14 is detected, the LOI displays the "O2 Cell Bad" message. Refer to the comments and procedures in paragraphs 1 through 4 above.

8-20