Emerson 3081FG - Manual (Page 61)

Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 6-3
Model 3081FG
6-4 IDENTIFYING AND CORRECTING FAULT
INDICATIONS
A fault in the operation of the Two-Wire In Situ
Oxygen Analyzer is indicated by the faulted op-
eration display. If no faults exist, the display will
indicate NONE. Information on the current fault
is found under the DIAGNOSTICS MENU as
detailed in Section 3, STARTUP AND
OPERATION.
The following paragraphs describe the faults,
possible causes, and corrective actions. Refer
to Figure 6-4 as needed for test points and wir-
ing information.
NOTE
Allow adequate time for the oxygen
probe to reach its operating tempera-
ture [approximately 500
°°°°C (932°°°°F)] be-
fore investigating a fault. The SHOW
FAULTS screen of the DIAGNOSTICS
menu will indicate a fault until the unit
reaches operating temperature.
NOTE
The probe uses a Type B thermocou-
ple to measure the cell temperature. A
Type B thermocouple output table may
be useful for troubleshooting.
4-20 mA (+)
4-20 mA (- )
CELL AND
THERMOCOUPLE
4-20 mA
26020023
GROUND
THERMOCOUPLE
+
(GY)
CELL
-(
WH)
THERMOCOUPLE
-(
RD)
CELL
+
(BK)
EARTH
GROUND
TERMINALS
TERMINAL
BLOCK (TB1)
FACTORY-INSTALLED
JUMPER
PROBE CABLE
SHIELD
12
3
5
6
7
8 9
11
12
13
14
15
16
10
4
Figure 6-4. Model 3081 Transmitter Terminal Block
6