VOLUMETER TRZ 03-K
The volumeter TRZ 03-K is the ideal flow meter for gas measurement in industrial applications, which are not under custody control: Providing high precison and reliability but nevertheless cost effective.
METHOD OF OPERATION, CONSTRUCTION
Method of operation
The TRZ 03-K Volumeter is a flow meter suitable for metering gases, 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.
Construction
The meter case comprises the measuring element with the
turbine wheel. A flow straightener located upstream of
the measuring element substantially eliminates turbulences and swirl from the gas flow and directs the gas onto
the turbine blades.
The rotary motion generated by the turbine wheel is transmitted by a magnetic coupling from the pressurized meter case to the unpressurized meter head. 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. In the case of larger nominal sizes and a higher pressure rating, the TRZ 03-K can be fitted with inductive highfrequency sensors scanning the turbine wheel (HF 3) and the reference wheel (HF 2). The reference wheel is a cam wheel located on the same shaft as the turbine wheel which enables the turbine wheel to be monitored.
FEATURES, MATERIALS
Features
Features gas onto the turbine blades.
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
max approx. 100 Hz.
Inductive pulse transmitter (HF 1), pulse frequency at
max 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.
Meter head (type “F”)
• Protection class IP 65
• Universally readable
• Totalizer unit and HF1 pulse transmitter are easily
replaceable on site.
Nominal size: DN 50 through DN 600 Special designs with larger nominal sizes up to DN 1000 are possible.
Pressure rating:
PN 10 through PN 100,
ANSI 150 through ANSI 600
Special designs with a higher pressure rating are
possible.
Operating temperature range:
Standard design: -10°C to +50°C
Special designs for higher and/or lower temperatures
are possible.
Explosion protection
The pulse transmitters are intrinsically safe; their type
of protection is EEx ib IIC T6. Therefore, the
TRZ 03-K can be operated in Zone 1.
Long service life
r-connection
To connect the pressure transmitter of a PTZ corrector.
Materials
Rotor: Delrin for DN 50 to DN 200 and PN 10 / PN 16.
Aluminium alloy for all other diameters and pressure ratings and for meters with HF sensors.
Aluminium rotors instead of delrin rotors on special request.
Meter case material (standard)
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TYPES OF GAS, MOUNTING,OPERATING INSTRUCTION
Types of gas
The TRZ 03-K standard design is suitable for use with all gases in compliance with the DVGW code of practice G260. The materials used are appropriate for gases and fuel gases, such as natural gas, refinery gas, gaseous liquids and their mixtures, nitrogen, CO2 (dry), air and all inert gases. For aggressive gases (e.g. biogas, acid gas or ethylene), there are special designs available with PTFE lining, special material, special lubrication, etc.
Mounting and operating instruction
The TRZ 03-K Volumeters can be operated in horizontal or vertical position up to the nominal size of DN 150. For DN 200 the mounting position must be specified in the order. From the nominal size of DN 250, they can only be installed in a horizontal position.
Special instructions for startup and operation:
Turbine meters are precise measuring instruments and must therefore be carefully handled during transport, storage and operation. Do not fill any downstream pipelines or station sections via the Volumeter. This may result in excessive flow rates with resultant damage to the turbine wheel. The gas meter has been designed for short-term overload operation at up to 1.2 times the value of Qmax. Such load conditions should be avoided, however, in order to protect the TRZ 03-K from any unnecessarily high flow rates. The gas flow must be free of shocks or pulsations, foreign particles, dust or liquids. Otherwise it is recommended that filters and separators be installed. No components affecting the gas flow are permitted directly upstream of the Volumeter (see DVGW guidelines and PTB guideline G 13).
In each case, a 2 DN inlet pipe and a 2 DN outlet pipe are
required, while also a bend may be used as outlet pipe. If
flow perturbation (e.g. due to a gas pressure controller)
occurs upstream of the inlet pipe, it is additionally
necessary to use a perforated-plate straightener. There
are perforated-plate straighteners available complying
with ISO 5167-1 or of the type RMG LP-35, the latter
resulting in a pressure loss which is 2.5 times lower than
that of the standardized flow straightener.
Reducers or expansion fittings must be installed upstream
of the inlet pipe, and their opening angle must not exceed
30°.
The gas meter must be installed in weather-proof
locations. For outside installations, appropriate guards
must be provided against direct weathering influences.
MEASURING RANGES, DIMENSIONS, WEIGHTS
Measuring ranges, dimensions, weights
