miniELCOR
17
4.3 Compressibility
calculation
4.3.1 PTZ, TZ conversion
The compressibility factor is calculated from the composition of the gas listed in
the parameters, using one of the following methods implemented in the device: AGA
NX-19-mod, SGERG-88, AGA8-G1, AGA8-G2 or AGA8-92DC.
Calculation of the compressible factor is performed in each measuring period. In
the SGERG-88 and AGA8-G1 methods the value of the heat of combustion is
entered for the combustion temperature 25°C / gas temperature 0°C. The service SW
contains a built-in calculator for the conversion of the heat of combustion at different
temperatures.
Due to the required accuracy of the device, the use of the individual methods of
calculation of compressibility is limited by the pressure and temperature ranges
pursuant to the following table:
Pressure
measuring range
Method
AGA NX-19
mod
SGERG-88 AGA8-G1
AGA8-G2
AGA8-92DC
80 ÷ 520 kPa -25 ÷ +60 °C
-25 ÷ +60 °C
-25 ÷ +60 °C
-25 ÷ +60 °C
200 ÷ 1000 kPa
N/A
-25 ÷ +60 °C
-25 ÷ +60 °C
-25 ÷ +60 °C
400 ÷ 2000 kPa
N/A
-25 ÷ +60 °C
-25 ÷ +60 °C
-25 ÷ +60 °C
700 ÷ 3500 kPa
N/A
-10 ÷ +60 °C
-10 ÷ +60 °C
-25 ÷ +60 °C
1400 ÷ 7000 kPa
N/A
-10 ÷ +60 °C
-10 ÷ +60 °C
-25 ÷ +60 °C
80 ÷ 1000 kPa
N/A
-25 ÷ +60 °C
-25 ÷ +60 °C
-25 ÷ +60 °C
400 ÷ 7000 kPa
N/A
-10 ÷ +60 °C
-10 ÷ +60 °C
-25 ÷ +60 °C
Table 1 Limitation of standard validity range of compressibility calculation
Note:
At device there is applied compressibily calculation method GOST NX-19 which
is not approved by
Č
MI certificate.
Usage of method GOST NX-19 is limited only for temperature range from -23°C
to +60°C.
Default compressibility
For the set method during each calculation, it is checked whether the measured
pressure and temperature value are in the valid interval of the pertinent method. If
some of the values are outside the valid interval, the so called default compressibility
is used for the conversion. The value of the default compressibility must be entered
by the user during device configuration.
4.3.2 PT, T conversion
The device also allows the setting of the ratio of compressibility factors (K) as a
fixed constant. The range of the entered constant is not limited.
Summary of Contents for miniELCOR
Page 13: ...miniELCOR 6 Fig 1 Volume and energy calculations Scheme...
Page 50: ...miniELCOR 43...
Page 55: ...miniELCOR 48 Fig 22 Basic navigation from the initial screen FW 2 xx...
Page 69: ...miniELCOR 62 Fig 30 Shielding connection in bushing 12 35...
Page 84: ...miniELCOR 77 Fig 33 Base device parameters Fig 34 Data archive...
Page 111: ...miniELCOR 104 Fig 64 Switch of communication protocol in the device...
Page 114: ...miniELCOR 107 Fig 66 Fig 67...
Page 119: ...miniELCOR 112 Fig 70 Fig 71...
Page 120: ...miniELCOR 113 Fig 72 Fig 73...
Page 121: ...miniELCOR 114 Fig 74 Fig 75...
Page 122: ...miniELCOR 115 Fig 76...
Page 125: ...miniELCOR 118...