Table 8-2: Relative density meters: Compressibility Method and valid ranges for process variables
Compressibility
Method
Valid range
Temperature Pressure Relative
density
% CO2 % N2 % H2
SGERG-88 −30 to
+100 °C
0 to 120 BarA 0.55 to 0.9 0–30%
(1)
0–50%
(1)
N/A
(1) The sum of CO2 and N2 must be less than 50%.
8.3.3 Configure energy content measurement using a field
communicator
The energy content parameters are used to measure and calculate calorific value, Wobbe index, and energy
flow.
Prerequisites
You must be able to supply gas composition data to the meter, for the following constituents:
• Carbon monoxide (CO)
• Carbon dioxide (CO2)
• Nitrogen (N2)
• Hydrogen (H2)
Gas composition must be measured in % by volume.
If you plan to measure energy flow, you must be able to supply flow data to the meter. You have the following
options:
• If you are using an external volume flow device, Volume Flow (External) and Mass Flow (Calculated) are
available.
• If you are using an external mass flow device, Mass Flow (External) and Volume Flow (Calculated) are
available.
Tip
In either case, you can measure energy flow in either mass units or volume units. The meter automatically
selects the appropriate process variable.
If you plan to poll an external device for any of these, ensure that the meter has the required polling slots
available. The meter provides four polling slots, and they may be already in use. You may need to use a fixed
value or digital communications for some external values. To check the current polling configuration, choose
Configure → Manual Setup → Inputs/Outputs → External Device Polling. If you are already polling for one
of these, you can use the existing polled data.
Procedure
1. Set the measurement units.
a) Choose Configure → Manual Setup → Measurements → Energy.
b) Set Calorific Value Unit to the unit to be used to measure calorific value.
Configuration and Use Manual Configure process measurement using a field communicator
MMI-20020954 March 2021
Configuration and Use Manual 73
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