Information for general use
Rev. M / 73023639
Classification of fuel gas types into groups based on their physical and
combustion properties (families, abbreviated to GF)
A distinction is made between 4 gas families. Gas families are classified in
Germany in DVGW Code of Practice G 260; natural gas and gas similar to
natural gas are members of the second gas family in this system.
are devices which automatically measure the superior calorific value of
gases. The superior calorific value, density at base conditions and carbon
dioxide content are calculated using the values from the sensors.
Reflects the influence of water vapor on calorific value/heat value.
Values for wet (saturated) gas or partly wet (partially saturated) gas are lower
than those for dry (unsaturated) gas because the total volume consists of
the components of hydrocarbons and water vapor.
The instrument do not analyze water vapor. The determination of the actual
water vapor content must, for example, be obtained from moisture or dew
point measurements.
The results are therefore calculated for three assumed standards (dry/wet
/partly wet) of water vapor.
Grounding the devices may create ground loops since the cable screens
create additional connections if they are connected to both sides.
A ground loop is electric cabling closed to create a loop. In the event of low-
frequency error currents, an undesirable voltage drop occurs in the signal
path and an interference signal is added to the signal as a result of the
impedance of the loop.
Grounding is the general term used for the highly conductive connection to
a reference potential, for example, to the earth which is also conductive.
This device connection is used, among other things, to prevent incoming and
outgoing interference as described in the EMC directives and allows various
electrical devices and equipment to be operated with a joint reference
potential.
also called net heating value or Lower heating value Hi (colloquially known
as energy content or energy value) is a heat variable.
In contrast to the Superior calorific value, the calorific value, all the
combustion products are in gaseous which is why this value is lower than the
superior calorific value. The value can refer to mole, mass or volume, for
example in kWh/m³.
also known as the standard audit trail, is a log archive which can be used by
all software parts and records every extraordinary situation, for example,
errors in the measuring equipment.
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