Deskripsi
Flow Meter Gas RMG TURBINE METER TRZ 03
Method of operation, Construction
Method of operation Flow Meter Gas RMG
The TRZ 03 turbine meter is a flow meter suitable for gas measurement in compliance with EN 12261 and OIML,
where the rate of flow is indicated by a mechanical totalizer in units of volume (cubic meters at flowing conditions)
under prevailing pressure and temperature. The gas flow is constricted to a definite cross section and
drives a coaxially mounted turbine wheel. The speed of the turbine wheel, which is proportional to the flow rate,
is reduced by gearing and transmitted to the mechanical digital index. The number of rotations is reduced by gearing in the
meter head, which can be adjusted by selecting an appropriate pair of adjusting gears, so that cubic meters
at flowing conditions are indicated by the mechanical totalizer. A reed contact (or an inductive sensor) located on the mechanical
totalizer provides low-frequency pulses whose number is proportional to the volume at actual conditions
flowed through. Inductive high-frequency sensors scan the turbine wheel
(HF 3) and the reference wheel (HF 2). The latter is a cam wheel located on the same shaft as the turbine wheel
which enables the turbine wheel to be monitored. Furthermore, the meter head can be equipped with an
encoder for digital transmission of the totalizer reading (Vo) to a volume corrector.
Flow Meter Gas RMG TURBINE METER TRZ 03
Features, Materials
Features
LF-Pulse transmitter (in the meter head)
Standard: reed contact
Alternatively : inductive pulse transmitter
Option: up to 3 LF pulse transmitters
possible
HF-pulse transmitter (option)
• In the meter head:
Inductive pulse transmitter (HF 1), pulse frequency at
Qmax approx. 100 Hz.
• In the meter case:
Inductive pulse transmitter for scanning
– the blades of the turbine wheel
(HF 3, from DN 80)
– the cams of the reference wheel
(HF 2, from DN 100)
All inductive pulse transmitters provide volume pulses in
compliance with NAMUR.
Standard measuring range 1:20 (MID)
With high-pressure testing, measuring ranges up to
1:160 are possible (depending on operating pressure).
Nominal size: DN 50 through DN 600
Pressure rating: PN 10 through PN 100,
ANSI 150 through ANSI 600
Operating temperature ranges:
acc. to MID: -25°C to +55°C
acc. to PED: -20°C to +80°C (spheroidal cast iron)
-40°C to +80°C (cast steel)
acc. to ATEX: -25°C to +70°C
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