User Manual

66 ISP-074-575-P1D

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