Emerson Process Management OXYMITTER 4000 Alarms O2 Temp Hi, Fault 9, High Heater Temp

Hazardous Area Oxymitter 4000

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

CALIBRATION RECOMMENDED

Instruction Manual

IB-106-340C Rev. 4.1

July 2004

i. Fault 9, High Heater Temp

Figure 8-11shows 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 9 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 five
times, 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
	default value (4 or 20 mA).
3.	This alarm is self-clearing. When tem-
	perature control is restored and the

KEYPAD

Alarms

O2 Temp Hi

LOI 37260027

Figure 8-11. Fault 9, High Heater Temp

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.

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

8

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-13