Emerson 3081FG instruction manual Fault Indications, Ofresponse, Speed

Instruction Manual

IB-106-3081 Rev. 1.5		Model 3081FG
September 2002
	500
	400
),sec	AIR TO 0.4% O2
90
(t	300
OFRESPONSE
	0.4% O2 TO AIR
	200
SPEED	100
	0
	IMPEDANCE, Ω	26020060

Figure 6-2. Speed of Response

Frequently conduct calibration checks to look for the following conditions:

•Continued degradation of cell slope.

•Sluggish response. (Note how long it takes the cell to respond to the application of cali-

bration check gases.) See Figure 6-2.

The slope will be valid only for the process tem- perature at which the calibration check gases are flowed, so no adjustments to the electronics are made as a result of a calibration check.

Note that cells exposed to temperatures above 1300°C (2372°F) may lose the ability to meas- ure accurately and respond quickly when re- turned to the lowest end of the operating temperature range [550°C (1022°F)].

%

mA

26020022

6-3 FAULT INDICATIONS

Figure 6-3. Faulted Operation Display

The fault conditions for the Two-Wire In Situ Oxygen Analyzer will be indicated by the faulted operation display as shown in Figure 6-3. This screen displays when a fault that invalidates the O2 reading is present. When the error is cor- rected, the screen will return to a normal opera- tion display unless another error exists.

6-2 Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management