Emerson Process Management OXYMITTER 4000 IM-106-340 - Manual (Page 105)

Instruction Manual
IM-106-340, Rev. 4.0
May 2006
8-13
Oxymitter 4000
Figure 8-9. Fault 7, High Case Temp
Fault 7, High Case Temp
Figure 8-9 shows 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 detected, The HEATER LED
flashes three times, pauses for three seconds,
and repeats.
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 requirements or that
heat due to convection 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.
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.
37260025
LOI
KEYPAD
Alarms
Board Temp Hi
DIAGNOSTIC
ALARMS
TEST
POINTS
HEATER T/C
HEATER
O2 CELL
CALIBRATION
CALIBRATION RECOMMENDED
O2 CELL mV +
O2 CELL mv -
HEATER T/C +
HEATER T/C -
INC INC
DEC DEC
HIGH
GAS
LOW
GAS
CAL
TEST GAS +
PROCESS -
% O2
SW2
TP1
J1
TP2
TP3
RED YEL GRN ORG
TP4
TP5
TP6
ON