14
• Connect the tubing to the barbed fitting of the sensor.
• IMPORTANT: Turn the gas on and allow to flow for at least one minute before
proceeding.
• Scroll through software menu to Zero Adj and tap Enter. The current zero
value will be displayed.
• Wait for the zero to stabilize.
• If the display is not already reading zero, trim the stabilized value to zero on
the display using the Up and Down arrows.
• Accept the value by tapping Enter with the magnetic wand.
• Turn off the gas flow and remove the calibration adapter from the sensor, or
disconnect tubing.
NOTE
Ambient air can be used to zero the sensor instead of nitrogen or
Zero Air if the area is known to be free of the target gas or any gas
to which the sensor may be cross-sensitive (as listed on the
sensor data sheet). In this case, no cylinder or calibration
adapter is needed for the zero calibration.
4.1.1.2 Span Calibration
WARNING
Never adjust the span before completing zero adjustment. Performing
these operations out of order will cause the calibration to be faulty.
• Attach the pressure regulator to the calibration gas cylinder.
DraegerSensor PR and LC:
• Fit the calibration adapter tightly to the end of the sensor.
Draeger Sensor IR:
• Connect the tubing to the barbed fitting of the sensor.
• IMPORTANT: Turn the gas flow on and allow to flow for at least one minute
before proceeding.
• Scroll through software menu to Span Adj and tap Enter. The span value will
be displayed.
• Wait for the span value to stabilize.
• Using the Up and Down arrows, trim the stabilized value to the calibration gas
concentration that is being applied to the sensor. If the sensor has reached
the end of its life, the span value will not be able to be reached. In this case,
replace the sensor.
• Accept the value by tapping Enter with the magnetic wand.
• Turn off the gas flow and remove the calibration adapter from the sensor, or
disconnect tubing.
Calibration
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