Emerson Process Management IB106-340 instruction manual Fault 9, High Heater Temp

Instruction Manual

IB-106-340 Rev. 2.4

April, 2001

	HEATER T/C
DIAGNOSTIC	HEATER	SW2
ALARMS	O2 CELL	ON
	CALIBRATION

CALIBRATION RECOMMENDED

Oxymitter 4000

i. Fault 9, High Heater Temp

The HEATER LED flashes five times,

pauses for three seconds, and repeats

(Figure 7-9).

1. If the thermocouple produces a voltage

in excess of approximately 30.7 mV,

the high heater temp alarm activates.

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 TP2 TP3 TP4

TP5 TP6

J1 RED YEL GRN ORG

22220040

2.	The 4-20 mA signal returns to the de-
	fault value (4 or 20 mA).
3.	This alarm is self-clearing. When tem-
	perature control is restored and the
	thermocouple voltage returns to the
	normal range, the alarm clears.
4.	If the temperature continues to rise, the
	next alarm will be the high high heater
	temp alarm.

Figure 7-9. Fault 9, High Heater Temp

7-12 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management