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Operation
You can adjust instrument sensitivity if a known concentration of gas exists between the
source and receiver units and instrument sensitivity is supsected. If a problem arises,
consult Rosemount.
You may need to adjust the span factor if you have fitted new gas cells or filters.
Calibrate
Re-enter the Mode 5 CALIBRATE menu and proceed to the Calibrate option.
You can calculate the basic calibration of the instrument from this routine. It is preferable
to conduct this operation with the plant shut down to ensure a zero gas concentration
within the duct. If this is not possible, the instrument can calibrate to a known value of the
gas concentration - the calibration target.
Set the calibration target either to a known value of the gas concentration or to zero. Then
set the desired number of cycles over which the calibration factor is determined
™
(Rosemount
recommends a minimum of 30). Now run the calibration, and the display will
show a countdown during its execution. When the calibration is complete, the new Cal
Factor is displayed for about five seconds, and the instrument exits the calibration routine.
Note
You must run the calibration routine during commissioning; otherwise, the instrument will not be
able to calculate the true level of gas within the duct.
Reference Manual
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Table of Contents
Troubleshooting
