Oxymitter 4000

 

HEATER T/C

 

DIAGNOSTIC

HEATER

SW2

ALARMS

O2 CELL

ON

 

 

CALIBRATION

 

CALIBRATION RECOMMENDED

Instruction Manual

IB-106-340 Rev. 3.0

December 2003

g. Fault 7, High Case Temp

Figure 8-9shows 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 7 is de-

tected, The HEATER LED flashes three

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

times, pauses for three seconds, and re-

peats.

1. If the case temperature exceeds 185°F

(85°C), the temperature control will

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

KEYPAD

Alarms

Board Temp Hi

LOI

37260025

Figure 8-9. Fault 7, High Case Temp

 

above the limit.

3.

Placing a spool piece between the

 

stack flange and the Oxymitter 4000

 

flange may eliminate this problem.

4.

If a spool piece does not solve the

 

problem, relocation is the only solution.

LOI. When Fault 7 is detected, the LOI displays the “Board Temp Hi” message. Refer to the comments in paragraphs 1 through 4 above.

Rosemount Analytical Inc. A Division of Emerson Process Management

Troubleshooting 8-11