50 • Calibration Program
Calibrating a 4-20 mA Detector Head
1. The display asks if you want to calibrate channel 1 (in this example a 4-
20 mA detector head). Press the UP/YES button to continue with
calibrating channel 1.
If you press the DOWN/NO button, the display will skip channel 1 and
ask if you want to calibrate channel 2.
2. If you pressed the UP/YES button, since channel 1 is a 4 - 20 mA
detector head in this example, the unit will display the following
message for a few seconds before continuing: Reminder. Calibration
Must Be Done at the Detector Head. Then the display will alternate
between the current gas reading for channel 1 and the message
CALIBRATE AT HEAD above the time remaining in the calibration
Time-out.
3. Verify that the detector head is in a fresh-air environment. (If
necessary, use a zero-emission air cylinder, also known as zero air, to
introduce a fresh-air sample when adjusting the zero reading below.)
4. Adjust the detector head’s zero reading (fresh air reading for oxygen).
See the detector head’s instruction manual for instructions on how to
adjust the zero reading (fresh air reading for oxygen).
5. Apply calibration gas to the detector head’s detector and adjust the
detector head’s span reading (zero reading for oxygen). See the
detector head’s instruction manual for instructions on how to adjust the
span reading (zero reading for oxygen).
6. Press the ENTER button to indicate that you are done with calibrating
channel 1 and are ready to continue.
Calibrating a Direct Connect Detector Head
1. The display asks if you want to calibrate channel 2 (in this example a
direct connect detector head). Press the UP/YES button to continue
with calibrating channel 2.
If you press the DOWN/NO button, the display will skip channel 2 and
return to the first calibration program screen which asks if you want to
continue or escape from the program.
2. If you pressed the UP/YES button, since channel 2 is a direct connect
detector head in this example, the unit will display the following
message for a few seconds before continuing: Expose Detector(s) To
Fresh Air. . . When Done Press ENTER. Then the display will
alternate between the gas reading and the message FRESH AIR
ENTER to ACCEPT ESCAPE to ABORT above the time remaining
in the calibration Time-out.
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