Emerson Process Management IB106-340 instruction manual Fault 7, High Case 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

g. Fault 7, High Case Temp

The HEATER LED flashes three times,

pauses for three seconds, and repeats

(Figure 7-7).

1. If the case temperature exceeds 185°F

(85°C), the temperature control will

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

22220038

shut off and the 4-20 mA signal output

will go to the default value.

2. This signifies that the environment

where the Oxymitter 4000 is installed

exceeds the ambient temperature re-

quirements or that heat due to convec-

tion is causing case temperature to rise

above the limit.

3. Placing a spool piece between the

stack flange and the Oxymitter 4000

flange may eliminate this problem.

Figure 7-7. Fault 7, High Case Temp

4. If a spool piece does not solve the

problem, relocation is the only solution.

7-10 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management