Emerson Process Management OXYMITTER 4000 Alarms Board Temp Hi, Fault 7, High Case 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

g. Fault 7, High Case Temp

Figure 8-9shows 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 7 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 three

times, pauses for three seconds, and

repeats.

1. If the case temperature exceeds 85°C

(185°F), 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 Hazardous Area Oxymitter

4000 is installed exceeds the ambient

temperature requirements or that heat

KEYPAD

Alarms

Board Temp Hi

LOI 37260025

Figure 8-9. Fault 7, High Case Temp

	due to convection is causing case tem-
	perature to rise above the limit.
3.	Placing a spool piece between the
	stack flange and the Hazardous Area
	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.

8

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 8-11