Elgas DATCOM, Operating Instructions Manual

Page: 145 / 228

8
Metrological Features
143
Fig. 70 Constant pressure value setting (SW Compass)
The size of the substitute value can be changed by the user after turning the service switch to the
ON position. Switching measured value p / constant value is protected by a metrological switch.
8.4.1.2 Gas temperature - measured or fixed value
By default, the measured value of the gas temperature t in the pipeline by the temperature sensor
is used to calculate C. In some special cases, instead of the measured temperature value, the
value that is entered into the device as a constant when configuring the device can be used for
the calculation. Then we talk about a substitute or constant value of temperature.
Substitute temperature value ts (Ts)
This value is used instead of the measured value of the gas temperature automatically if the so-
called error conditions occur, i.e. in the following cases:
 the measured gas temperature is outside the measuring range, or
 an error has occurred and the measured gas temperature value is not available
Constant temperature value t (T)
The constant temperature value is used if the instrument is not equipped with a transmitter for
measuring the gas temperature. The use of a constant value must be set manually in the device
parameters.
Note:
This option is not allowed if the instrument is delivered as a specified meter according to MID
approval (certificate TCM143 / 18-5562).
Setting of substitute and constant temperature value
The substitute temperature value ts (Ts) and the constant temperature value t (T) are in fact one
single common value entered in the instrument parameters. If it is to be used as a constant value,
it is necessary to select a constant value for the temperature parameter on the parameter card C
instead of the measured value p. Spare size, resp. constant temperature is entered in the field