Alarms O2 Temp Hi, Fault 9, High Heater Temp

Oxymitter 4000

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

CALIBRATION RECOMMENDED

Instruction Manual

IB-106-340 Rev. 3.0

December 2003

i. Fault 9, High Heater Temp

Figure 8-11shows 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 9 is de-

tected, the HEATER LED flashes five times,

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

pauses for three seconds, and repeats.
1.	If the thermocouple produces a voltage
	in excess of approximately 30.7 mV,
	the high heater temp alarm activates.
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.

KEYPAD

Alarms

O2 Temp Hi

LOI

37260027

Figure 8-11. Fault 9, High Heater Temp

4. If the temperature continues to rise, the

next alarm will be the high high heater

temp alarm.

LOI. When Fault 9 is detected, the LOI dis- plays the “O2 Temp Hi” message. Refer to the comments and procedures in para- graphs 1 through 4 above.

Rosemount Analytical Inc. A Division of Emerson Process Management

Troubleshooting 8-13

4000 specifications

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Emerson 4000 manual Alarms O2 Temp Hi, Fault 9, High Heater Temp

Models: 4000