Emerson Process Management OXYMITTER 4000 Alarms Very Hi O2 Temp, Fault 6, High High Heater Temp

Instruction Manual

IB-106-340C Rev. 4.1 July 2004

Hazardous Area Oxymitter 4000

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

CALIBRATION RECOMMENDED

f. Fault 6, High High Heater Temp

Figure 8-8shows 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 6 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 TP2 TP3 TP4

TP5 TP6

J1 RED YEL GRN ORG

detected, the HEATER LED flashes twice,
pauses for three seconds, and repeats.
1.	The high high heater temp alarm will
	activate when the thermocouple pro-
	duces a voltage of 37.1 mV
	[900°C (1652°F)].
2.	The triac and the temperature control
	may be at fault.
3.	Remove power. Allow Hazardous Area
	Oxymitter 4000 to cool for five minutes.

KEYPAD

Alarms

Very Hi O2 Temp

LOI 37260024

Figure 8-8. Fault 6, High High Heater Temp

Restore power.

4. If the condition repeats, replace the

electronic assembly per paragraph

9-4c.1,Electronic Assembly

Replacement.

LOI. When Fault 6 is detected, the LOI displays the “Very Hi O2 Temp” message.

1.The very high O2 temperature alarm will activate when the thermocouple produces a voltage of 37.1 mV [900°C (1652°F)].

2.The triac and the temperature control may be at fault.

3.Remove power. Allow the Oxymitter 4000 to cool for five minutes. Restore power.

4.If the condition repeats, replace the electronic assembly per paragraph 9-4c,Electronic Assembly Replace- ment.

8-10 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management