The state volume converter UNIGAS PTZ converts the measured gas volume Vb of one gas meter at operation condition into m³ dry gas from standard condition pn = 1,01325 bar and Tn = 273,15 K.
The compressibility is considered as fixed value or acc. to the chart pressure stored in the calculator and temperature dependent.
The operation volume gas meter transmits impulses proportional to the measured flow to the processor of the UNIGAS PTZ Compact by means of a low frequency impulse converter mounted in or at the gas meter. The processor receives the values of the operation pressure and -temperature from the sensors, which are either installed directly at the gas meter or at the piping.
Scope of delivery
UNIGAS PTZ Compact consists of the micro-processor controlled computing device, the pressure- and the temperature sensors and an optimised 3-way test cock. The computing device can be mounted directly to the gas meter or separately and is certified for use in hazardous aereas according to (EEX ib IIC T5).
Pabs= 0,9 bar to 6,0 bar with official calibration "national"
Pabs= 4,0 bar to 10,0 bar with official calibration "national"
Gas temperatures -10°C to 40°C
Ambient temperature -10°C to 40°C
Storage temperatures -20°C to 50°C
Natural gas acc. to DVGW-worksheet G 260, technical gases.
Total errors of measurement (reproducibility, hysteresis, room temperature) within ± 0.5 % from measured value.
A standard m3 impulse output with pulse times of 10 ms, 30 ms, 40 ms or 100 ms is programmable. Furthermore, an actual m3-impulse output or a fault alarm output is also programmable. A data interface RS 232 is also available.
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