11.5
Integrated volume corrector (option)
The electronic meter index on the MQMe Quantometer can be optionally fitted with an
electronic volume corrector. In this case, the flow rate and volume of the gas under
standard conditions are calculated in accordance with AGA NX-19. An external pressure
and temperature sensor must be installed for these calculations. If a pressure and
temperature sensor is not installed, fixed values can be set for the calculations according to
AGA NX-19. The standard configurations set in the factory are 273.15
°K (0°C); 1013.25
mbar, unless otherwise agreed.
11.6
Pressure and temperature sensor
If an external pressure and temperature sensor is connected to the MQMe Quantometer,
the necessary wiring is described in Fig. 11 to Fig. 15. Communication with the external
sensors is via a bus system. Pressure sensors with measuring ranges of 5 and 10 bar
absolute pressure are supported.
11.7
Communication
The MQMe Quantometer has several options for transmitting the measured and calculated
data to a digital control system (DCS) or SCADA. The MQMe Quantometer can be
optionally equipped with a RS485 or M-Bus interface and a high frequency (HF) or low
frequency (LF) pulser (for configuration with volume correction).
In addition, a scalable 4–20 mA output signal can be optionally used for transmitting the
data. The rotation of the turbine wheel can also be monitored using an external high
frequency (HF) sensor. The signal from the HF sensor enables the actual gas flow to be
determined to a high level of precision and it can be transmitted to any digital control
system (DCS) or SCADA for control and regulation purposes.
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