Thermo Scientific INNOVA Series Instruction Manual page 75

6. Press the → button to restart the pump.
7. Remove the probe and attach the dilution fitting directly to the inlet
fitting of the Innova.
8. Attach the probe to the dilution fitting.
9. Attach the Tedlar bag tubing to the gas sample port of the transformer.
10. Open the valve on the bag two full turns then fill the bag with gas
from the head space of the transformer, closing the valve when the
bag is full.
11. Remove the gas collection bag.
12. Open the valve on the collection bag and attach the bag directly to the
inlet of the probe on the Innova Transformer Gas Tester.
13. View the Innova Transformer Gas Tester display to determine the
concentration of combustible gas in the transformer.
14. Remove the gas collection bag from the probe when complete and
close valve on bag.
NOTE
When testing for oxygen content, either remove the dilution fitting
from the Innova Transformer Gas Tester or place your finger over the
small orifice on the dilution fitting before performing test.
Calibration
The Calibration procedure for the transformer gas tester version is identical
to the procedure as outlined in the calibration section of this manual. The
calibration gas cylinder is 25% LEL Hydrogen, 12% Oxygen, balance
Nitrogen. Users should enter the Autocal gas value for the LEL range as
50% LEL, to compensate for the dilution probe and to provide the correct
readings when the 1:1 dilution fitting is used. The dilution fitting must be
removed for calibration.
The Innova Transformer Gas Tester is calibrated with 1% hydrogen (25%
LEL) in the LEL range.
NOTE
The Innova XT is calibrated to allow for correct readings when used
with the 1:1 dilution probe in %LEL mode or without the dilution
probe in PPM mode.
71-6417
Appendix C
67