63
7.
Connect the span gas to the 2020PROPlus (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 2020PRO
Plus).
8. The 2020PROPlus will take 60-90 seconds to set the span set point.
When finished with the calibration, the 2020PRO
Plus will display
“Calibration complete”.
NOTE: If you are not using the Photovac 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.
Calibration Using a Gas Bag
Preparing the Calibration Gas Bag and the Zero
Air Bag
WARNING
Observe proper handling techniques for all gases!
1. Connect the regulator to the calibration gas cylinder.
If you are using a portable tank of calibration gas, connect the regulator
directly to the tank.
If you are using a large cylinder of calibration gas, you must obtain a
high purity regulator. Isobutylene in air is usually supplied with a
standard CGA 590 cylinder valve outlet. Obtain a regulator with the
matching fitting. Connect the regulator to the tank of calibration gas.
Tighten the regulator onto the tank with a wrench. Do not over-tighten.
NOTE: Do not force the connection.
Do not use Teflon
®
tape with CGA fittings. In general, these fittings are designed for
metal-to-metal sealing.
Do not use adapters to connect one CGA fitting to another type of CGA fitting. If the
regulator does not match the outlet on your calibration tank, contact your specialty
gas supplier.
2. Attach the knurled nut on the gas bag adapter to the regulator. Finger-
tighten the fitting.
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