Volumetric Measurement of Gas Volume & Calibration of Gas Volume
Opposite to measurement of temperature or pressure, the accurate measurement of gas volume
(and
gas
flow
rate)
requires
a
comprehensive
knowledge
of
the
physical
behaviour
of
gas.
For
example,
mass
flow
meters
don’t
measure
gas
volume
but
the
gas
flow
rate
by
the
change
of
resistance
of
two
heated
wires.
However,
this
change
of
resistance
is
dependent
on
the
gas
composition
(gas
mixtures), temperature, humidity etc..
RITTER manufactures drum-type gas meters which volumetrically measure gas volume. With
this measurement principle, the gas volume is measured directly thus eliminating the mentioned
factors
falsifying the measurement results. The measurement accuracy of all RITTER
drum-type meters is ±0.5% of reading across the full measurement range. Furthermore, the
RITTER gas meters are made from superior thermoplastics for measurement of even highly
aggressive gases.
Obviously, the calibration of such highly accurate gas meters is of utmost importance. RITTER
developed and manufactures a calibration system for gas flow rate and gas volume based on
the technology of Sonic Nozzles. This measurement principle allows calibration uncertainties
of down to 0.3%. Because there are no expendable or moving parts, the calibration results are
long-term stable (nozzles > 2 m³/h 10 years, < 2 m³/h 5 years). Furthermore, the system is
maintenance-free.
Dr.-Ing. Ritter Apparatebau GmbH, Germany
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