GE MG-101, User Manual

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MG-101 User’s Manual 9
Chapter 2. Setup and Operation
2.2 Operating Procedure (cont.)
6. Open and adjust the valves on both the
DRY GAS FIRST DILUTION
and the
DRY GAS SECOND DILUTION
rotameters, so
that the steel ball indicates approximately
“10”
on the rotameter scales.
7. Adjust the vent valve so that the steel ball on the WET GAS DILUTED rotameter also reads approximately “10.”
IMPORTANT: Leak test all connections from the nitrogen supply to the calibration chamber before proceeding.
8. Allow the nitrogen to purge through the entire system at the rotameter settings defined in the previous steps. The
calibration system will begin to dry down and eventually come to equilibrium with the dry nitrogen supply gas.
The time required to achieve equilibrium will vary depending on the moisture level of the nitrogen (approximately
6 to 18 hours will be required).
9. After the calibration system has reached equilibrium, set the valve on the
WET/DRY
rotameter to the
WET
position.
Figure 6: Rotameters and Valves
Temperature
Gauge
Vent Valve
Wet/Dry
Selector Valve
Dry Gas
Second Dilution
Wet Gas
Rotameters
Wet Gas
Dry Gas
First Dilution
Diluted