Emerson Oxymitter 4000 Instruction Manual download pdf (Page 99)

Instruction Manual

IM-106-340C, Rev. 4.4

July 2008

8-9

Hazardous Area Oxymitter 4000

Figure 8-5. Fault 3, Reversed Thermocouple

Fault 3, Reversed Thermocouple Wiring or

Faulty PC Board

Figure 8-5 shows 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). The upper view also shows J1 and

test points TP1 through TP6, located on the

microprocessor board, below the membrane

keypad or the LOI module.

Membrane Keypad

When Fault 3 is detected, the HEATER T/C LED

flashes three times, pauses for three seconds,

and repeats.

1. Using a multimeter, measure the voltage

from TP3+ to TP4-. If the reading is

negative, the thermocouple wiring is

reversed.

2. Check red and yellow wires in the J1

connector for the proper placement.

3. If the wiring is correct, the fault is in the PC

board. See "Electronic Assembly

Replacement" in Section 9: Maintenance

and Service.

LOI

When Fault 3 is detected, the LOI displays the

"O2 T/C Reversed" message.

1. Remove power. Unscrew and remove the

LOI module from the electronic assembly.

2. Reconnect power to the Oxymitter 4000.

3. Perform the diagnostic steps 1 through 3

shown for the membrane keypad.

Alarms

O2T/CReversed

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

TP2

TP3

RED

YEL

GRN

ORG

TP4

TP5

TP6

38860046

LOI

KEYPAD

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 183 184

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Emerson Oxymitter 4000 Instruction Manual Page 99

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