Gas is a substance subject to thermal expansion, which means that depending on temperature, it increases or decreases its volume. Consequently, what changes is the measuring accuracy of a gas meter with relation to its energy content. In other words when gas with some energy content, volume and temperature is already in pipes and is heated, then the index unit is to show a bigger consumption after flow, whereas when gas is cooled, the gas meter will indicate a lower consumption.
It is a very important issue as a temperature change of 3˚C corresponds to a volume change of approximately 1%. Such considerable temperature changes are likely to occur especially to meters placed on the outside of a building. Consequently the meter works at various temperatures depending on the season. A gas meter with temperature compensation provides a solution to this problem as it uses and undergoes thermal expansion as well.
A temperature compensation mechanism installed in the measuring unit is adjusted in such a way so that it changes the cyclic volume of the measuring unit exactly like gas undergoing expansion due to temperature changes. Elements responsible for compensation installed in the meter allow a radial shift of the diaphragm, which results in moving the curve of typical error up or down in relation to the zero line.
Thus the gas meter converts the measured value of gas volume into its value at fiducial temperature – irrespective of measuring temperature.
UG SERIES V=1.2 dm3
UG 1.2 dm3 series gas meters are designed for measurement of gas supplied to apartments where consumption of gas does not exceed 6 m3/h of air density of 1.2 kg/m3.
THE GAS METERS CAN BE USED FOR MEASUREMENT OF:
- Natural gas
- City gas
- Propane-butane gas
Gas meter is equipped with pulse magnet as standard.
Pulse transmitter can be added at any time (1 imp = 0.01 m3).
THE GAS METERS CAN BE USED FOR MEASUREMENT OF:
- Natural gas
- City gas
- Propane-butane gaGas meter is equipped with pulse magnet as standard.Pulse transmitter can be added at any time (1 imp = 0.01 m3).
| UG G1.6 | UG G2.5 | UG G4 | ||
| Maximum flow rate | m3/h | 2.5 | 4 | 6 |
| Minimum flow rate | m3/h | 0.016 | 0.016 / 0.025 | 0.016 / 0.025 / 0.040 |
| Nominal flow rate | m3/h | 1.6 | 2.5 | 4 |
| Cyclic volume | dm3 | 1.2 | 1.2 | 1.2 |
| Max working pressure | bar | 0.5 / 2* | 0.5 / 2* | 0.5 / 2* |
| Index max indication | m3/h | 99999.999 | 99999.999 | 99999.999 |
| Starting flow rate | dm3/h | 3 | 5 | 5 |
| Fireproof up to 650 ºC according to EN 1359 | bar | 0.1 | 0.1 | 0.1 |
ADDITIONAL INFORMATION ON GAS METERS WITH MECHANICAL TEMPERATURE COMPENSATION
| UG T | |
| Cyclic volume | 1.15 (1.2) dm3 |
| Allowable indication errors limits during initial verification: – Qmin to 0.1 Qmax | ± 3.5% |
| – 0.1max to Qmax | ± 2.0% |
| Temperature range | -25 ÷ 55°C |
| UG T – TC correction range: – standard | -10 ÷ 40°C |
| – optional | -25 ÷ 40°C |
| A [mm] | B | [mm] | C [mm] | D | [mm] | E | [mm] | Weight [kg] | |
| Steel | Alu | Steel | Alu | Steel | Alu | Steel | Alu | ||
| 000 | 200 | – | 226 | – | 163 | – | 66 | – | ~ 1.7 |
| 100 | 200 | 210 | 212 to 224 | 210 | 163 | 175 | 66 | 74 | ~ 1.7 |
| 110 | 200 | 210 | 208 to 228 | 210 | 163 | 175 | 66 or 70 | 74 | ~ 1.7 |
| 130 | 200 | – | 212 to 228 | – | 163 | – | 66 | – | ~ 1.7 |
| 152.4 | 235 | – | 262 | – | 177 | – | 72 | – | ~ 3 |
| 160 | 235 | – | 241 | – | 177 | – | 77 | – | ~ 3 |
| 220 | 283 | – | 223 | – | 177 | – | 72 | – | ~ 2.9 |
| 250 | 326 | – | 223 | – | 177 | – | 72 | – | ~ 3.2 |
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