Emerson 3081FG instruction manual Identifying and Correcting Fault Indications, Thermocouple

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.

Instruction Manual

IB-106-3081 Rev. 1.5

September 2002

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.

	CELL+(BK)	CELL-(WH) THERMOCOUPLE-(RD)		THERMOCOUPLE+(GY)
FACTORY-INSTALLED
JUMPER
TERMINAL	7	8 9	10		EARTH
BLOCK (TB1)				11
	6				GROUND
	5			12
					TERMINALS
	4			13
PROBE CABLE
	3			14
SHIELD	2			15	4-20 mA (- )
	1
GROUND					4-20 mA (+)
				16
CELL AND					4-20 mA
THERMOCOUPLE					26020023

6

Figure 6-4. Model 3081 Transmitter Terminal Block

Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 6-3