Elgas DATCOM, Operating Instructions Manual

Page: 142 / 228

8
Metrological Features
140
Pressure
Measurement Range
Method
GOST 13390.2 GOST 13390.3
100 ÷ 520 kPa
-23,15 ÷ +70 °C -23,15 ÷ +70 °C
100 ÷ 1000 kPa -23,15 ÷ +70 °C -23,15 ÷ +70 °C
100 ÷ 2000 kPa
-23,15 ÷ +70 °C -23,15 ÷ +70 °C
200 ÷ 1000 kPa -23,15 ÷ +70 °C -23,15 ÷ +70 °C
400 ÷ 2000 kPa
-23,15 ÷ +70 °C -23,15 ÷ +70 °C
400 ÷ 7000 kPa -10 ÷ +70 °C -23,15 ÷ +70 °C
700 ÷ 3500 kPa
-10 ÷ +70 °C -23,15 ÷ +70 °C
1400 ÷ 7000 kPa -10 ÷ +70 °C -23,15 ÷ +70 °C
2500 ÷ 13000 kPa Not applicable -23,15 ÷ +70 °C
Table 21 Limitation of ranges applicability given by limitation in compressibility calculation (GOST)
8.3.1.1 Substitute Compressibility
For the selected method, it is checked at every calculation whether the measured value of
pressure and temperature is within the range of the method validity. If a value is outside of this
range, substitute compressibility K is used for the conversion. The substitute compressibility value
must be entered by the user when configuring the device Fig. 67.
Fig. 67 Setting the substitute compressibility value K for calculating C (SW Compass)
8.3.2 PT, T Conversion
If it is required to set the device as PT or T corrector, then the device does not calculate gas
compressibility, but a fixed constant value is used as the degree of compressibility K to calculate
the conversion number K. The constant value of the degree of compressibility K is set in the
device parameters for parameter C (Fig. 67). For the value "Compressibility" it is necessary to set