INFICON 2020ComboPRO Portable Photoionization Detector - Manual (Page 73)

66 ISP-074-575-P1D 66
Calibrating the 2020ComboPRO with the
Flow-Match Regulator
1. Ensure that the short sample probe is connected to the 2020ComboPRO
inlet. If you are using the long probe for sampling, then ensure the long
probe is connected to the 2020ComboPRO.
NOTE: Ensure the sample probe is free of any contamination, as this will affect the
calibration.
2. Press the CAL key.
3. Follow the instructions on the display and either connect the
2020ComboPRO to zero air, connect the optional activated charcoal
filter (F1760176) and filter tube holder (A1790500), or leave the
instrument unconnected so it can sample clean ambient air. Then press
the “Next” key. The 2020ComboPRO will take 60-90 seconds to set the
zero point for calibration.
4. The 2020ComboPRO display will show “Zero air calibrated. Continue
calibration?” If span is required, press the “Next” key.
5. Enter the span gas concentration if the concentration displayed on the
2020ComboPRO is different than the concentration of the span gas
cylinder. Press the “New” key and follow the display prompts. For
further information, see page 45 for numeric value, duration, time, and
date entry. If the span concentration matches the span gas cylinder
concentration, press the “Next” key. To exit calibration, press the
“Cancel” key.
6. Ensure the calibration gas cylinder is upright and open the regulator by
turning the valve counter clockwise. Open the regulator until the ball is
1/8” (3mm) from its rest position.
7. Connect the span gas to the 2020ComboPRO (if the zero air calibration
was done with either a Zero Air cylinder or the optional activated
charcoal tube and tube holder, either should be disconnected before
connecting the span gas fitting to the 2020ComboPRO).
8. The 2020ComboPRO will take 60-90 seconds to set the span set point.
When finished with the calibration, the 2020ComboPRO will display
“Calibration complete”.
NOTE: If you are not using the INFICON Flow-Match Regulator, ensure that the inlet
pressure is less than 5 psi when calibrating.
NOTE: While the Cal status is active, all alarms are deactivated.
TARE selection
It is not unusual that, under normal operating conditions , a small letter ‘z’ will
appear on the bottom left of the display. This indicates that the zero setting on the