Emerson Process Management IM-106-340 Alarms Board Temp Hi, Fault 7, High Case Temp

Instruction Manual

IM-106-340, Rev. 4.0

May 2006

Figure 8-9. Fault 7, High Case Temp

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

CALIBRATION RECOMMENDED

Oxymitter 4000

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 detected, The HEATER LED flashes three times, pauses for three seconds,

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

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

KEYPAD

Alarms

Board Temp Hi

LOI 37260025

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.

8-13