Over 70 years of successful
experience
Rotary piston gas meters have been
manufactured since 1930 by Aerzener Maschinenfabrik, one of the largest and
oldest manufacturers worldwide. The basis for the design of the gas meter
series is from many years of experience and continual dialogue with the end
users, as well as using the harmonized EU-standards which will apply to all
installations within the European Market. They are manufactured in accordance
with the Aerzen tradition for quality, correspond to our quality assurance
system and are certified to DIN ISO 9001 and as per pressure device guideline DGRL
97/23/EG.
Mode of operation
Rotary piston gas meters operate
according to the positive displacement principle. They are used for metering
gas in closed piping systems. A pressure difference between the inlet and
outlet of the gas meter produces a driving torque on the rotary pistons. Once
the driving torque exceeds the inertia of the rotors, they begin to rotate in
the direction of the arrows. During rotation, the cavities formed between the
rotors and the cylinder housing fill and discharge with a volume of gas,
Therefore, the rotation of the pistons is a value for the gas which has flown
through. The rotation is transmitted via an adjusting gear to the counter, it
records the gas volume that has passed across the gas meter in actual cubic
meters. The rotors turn very freely, because no metal contact takes place
within the measuring chamber. Measuring starts at Δp< 0.1 mbar and
Q~1/1000 Qmax.
More flexibility by new counter design
The Aerzen rotary piston gas meters are
equipped with a new double roller type counter, which enables upon
commissioning an adjustment to the flow direction without intervention of the
counter and without supervision by a calibration inspector. Consequently,
less storing time is necessary and costs of short-term modifications regarding
planned projects can be avoided.
The adjustment at site to the requested
flow direction can be undertaken easily and without the use of tools. The counter
provides two displays working in opposite direction which are covered by a
shield when delivered. After determination of the flow direction, the cover is
removed and the corresponding display becomes visible. If necessary the
counter head can be turned by 90° by loosening 2 hexagon socket screws.
|
