Revision 1 132 9/10/2019
6.6 Calibrating/validating the Analyzer
The analyzer must be calibrated using known certified standards. The concentration of the
calibration gas should be 50 - 75 % of the analyzer’s full scale.
The analyzer can be calibrated 3 ways:
a) Manual Calibration (Section 6.6.1)
b) Manually Initiated Auto Calibration (Section 6.6.2)
c) Auto Calibration (Section 6.6.3)
6.6.1 Manual Calibration
The analyzer must be equipped with a manually operated 3-way valve that
can be used to introduce calibration gas to the analyzer.
a) Place the analyzer in Bypass mode by pressing the Bypass button on the handheld
keypad. This will disable any alarm outputs.
b) Connect the calibration gas to the Calibration port of the analyzer and set the output
pressure of the calibration standard to the same pressure that the sample gas normally
runs at (this is typically 15 psig).
c) At this point the analyzer will be running its auto sequence. If calibration gas is introduced
all outputs and data logs will be updated with information that is generated while the
calibration gas is running. If this is not desired, place the analyzer can be in Reference
Mode. While the analyzer is in Reference Mode, any data will be logged as Reference
data, not as stream data. To place the analyzer in reference mode, using the GUI
software to initiate the Reference 1 Manual sequence.
If the analyzer is to be calibrated while the analyzer is still running the auto
sequence, it is important to disable the High High alarm if the calibration
gas is higher than the alarm setpoint.
d) Turn the 3-way valve to introduce calibration gas to the analyzer.
e) Allow the analyzer to analyze the calibration gas until the readings become stable. This
typically takes 15 to 30 minutes. Once the readings become stable, make a note of the
current analyzer reading.
f) To calibrate the analyzer, an adjustment must be made to the analyzer’s Gain Factor.
The gain factor can be found on the Streams tab of the GUI as well as on the hand held
keypad. The new Gain Factor can be calculated by formula shown in Equation 6-1.:
New Gain = (Calibration Gas Value / Current Analyzer Reading) × Current Gain Factor 6-1
The Global tab has a Gain Calculator where the user can enter the Calibration Gas Value,
the Analyzer reading and the current Gain Factor. The calculator will calculate the value for
the new gain; however, the user will still have to enter it in the GUI or through the keypad.
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