Pilot Study: Comparison of calibration a wet drum gas meter
Project Description
A drum gas meter will be used to compare low pressure standards (provers) over the flow range (0.016 ÷ 2) m3/h. The gas meter will be calibrated at 10 flow rates:
0.016 m3/h, 0.04 m3/h, 0.1 m3/h, 0.16 m3/h, 0.25 m3/h, 0.4 m3/h, 0.6 m3/h, 1 m3/h, 1.6 m3/h, 2 m3/h.
The cyclic volume of the gas meter is V=5 dm3. During testing, it will always be necessary to test integer multiples of the cyclic volume. The oil level is adjusted visually by adjusting the lower part of the meniscus to the needle installed in the gas meter at the 0 position of the pointer.
The laboratories should carry out the calibration using their normal procedures. HF pulse transmitter (3-wire sensor 5 V) will have to be used.
The gas meter will have to be shipped empty without oil, the oil will be shipped separately in a canister.
If laboratories are not able to cover all the flow rates, they may calibrate the meter over part of the flow range.
Each laboratory will be responsible for the transfer of the meter to the next laboratory. The loop will be for the countries, which the ATA Carnet will be issued and these countries will have to use only services of delivery company for the gas meter transport.
Test conditions:
- Test gas: air
- Test pressure: near atmospheric
- Test temperature: (18 – 22) °C
- Relative humidity: less than 80%
Tomáš Valenta, (CMI, Czechia) will support the coordination of this project.