5/9/2018 6/8/2020 1
Approved By Issue Date Revision Date Revision Level
Brian Ziegler
Middleton Laboratory Local Operating Procedure
This Calibration procedure applies to all Dry Gas Meters in Middleton, Wisconsin Laboratory.
Equipment used: Spirometer
Using the Spirometer: The Spirometer consists of two tanks. The green tank has a U-tube on it to show any pressure (either positive or negative) in the green tank. The sight glass vial with the ruler near it tells what the level of water is in the green tank. The controls at the Spirometer consist of a water valve and a clamp for the hose. The valve controls the flow of water between the tanks. The clamp controls the up and down movement of the red tank. NEVER STAND UNDER THE RED TANK WHEN IT IS ELEVATED!!
When the Spirometer is not in use most of the water is stored in the red tank on the floor.
1. Connect hoses to Dry Gas Meter (DGM) and manometer as shown in figure 1 for leak test.
Figure 1
2. With spirometer clamped off pressurize the system by blowing into the hose, which is attached to the inlet port of the DGM. When there is 6 to 8 inches of pressure, clamp off the hose you just blew into. The manometer liquid will rise until pressure is equal in the system then stop. If the manometer does not stop rising there is a leak. Repair the leak as necessary and recheck. 3. Connect as in figure 2 for calibration of the meter. In this case, the manometer is used to monitor the pressure at the DGM. A reading of 2.0 in H2O with the system operating indicates a flow restriction that must be remedied before continuing the calibration.
Figure 2
LMS-AMER-MID-WI-13
Version 06/08/20
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