PerkinElmer Photovac 2020, Manual

Page: 77 / 190

Detailed Operation
75
8. Repeat this procedure, if necessary, to prepare a bag of
zero air.
NOTE: Do not use the same gas bag or gas bag adapter for the bag of
zero air. You will contaminate the bag of zero air.
Calibrating 2020 with a Gas Bag
1. Disconnect the probe from the 2020.
2. Press the ENTER key.
3. Select “Set”, “Cal” and then “Mem”.
4. Select the desired Cal Memory. 2020 has 15 Cal
Memories and can be calibrated with 15 different span
gases or response factors if required. Only one Cal
Memory can be used at a time. Each Cal Memory
stores a different response factor, zero point, sensitivity,
and alarm levels.
5. Select “Chng” and then “User”. Enter a name for the
calibration memory.
6. Press the ENTER key and enter a response factor.
7. Press the ENTER key and enter an alarm level for each
mode.
8. Press the ENTER key and enter a response factor.
Refer to page 169 for a list of Response Factors.
If the compound is not listed or you are measuring gas
mixtures, then enter a value of 1.0. The concentration
detected by 2020 will be multiplied by the response
factor before it is displayed and logged.
9. Connect the supply of zero air. If you are using a gas
bag with zero air, open the bag and connect the gas bag
adapter to the inlet.