Calibration; Overview; Sensing Unit Calibration Warning - Honeywell 7866 Operation And Maintenance Manual

5.1

Overview

Analyzer calibration
The 7866 analyzer is calibrated at the factory before shipping. The analyzer must be field-calibrated prior
to operation. The input calibration procedure includes:
•
Setting the Zero for Range 1: 100 % Air; 0 % CO
•
Setting the Span for Range 1: 0 % Air; 100 % CO
•
Setting the Zero for Range 2: 100 % CO
•
Setting the Span for Range 2: 0 % CO
•
Setting the Zero for Range 3: 100 % H
•
Setting the Span for Range 3: 75 % H
Indicator calibration
The 7866 Indicator is calibrated at the factory before shipping. You do not need to recalibrate it before
operating it.
The PV Input selection is factory set for 1-5V to be consistent with the Analyzer output of 4-20mA. If you
change the analyzer output to 0-20 mA you must change the PV Input to 0-5V. Recalibration is not
necessary because the indicator automatically rescales the input values.
The PV Input calibration procedure includes:
•
Setting the Zero for the PV Input
•
Setting the Span for the PV Input
Other
This section also includes the procedures for:
•
field-calibrating the current output(s),
•
entering a security code,
•
changing the security level, and
•
setting alarm limits.
5.2

Sensing Unit Calibration Warning

•
Do not open the threaded cover of the sensing unit unless the power source is disconnected. Then loosen the set
screw to permit threaded cover to be turned.
•
Before making any test with power applied to the sensing unit, either remove the sensing unit to a non-hazardous
area or verify that the atmosphere is free from combustible gases.
Failure to comply with these instructions could result in death or serious injury.
9/06 7866 Triple Range Digital H

5. Calibration

; 0 % H
2 2
; 100 % H
2 2
; 0 % N
2 2
; 25 % N
2 2
and CO Analyzer/Indicator - Operation and Maintenance
2 2
2
2
Calibration
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