unique mounting features for thermal mass flow meters · thermal mass flow sensor sensor element...
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Unique mounting features for
Thermal Mass Flow Meters
By Martin Raab in
cooperation with CaTeC b.v.
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E+E ELEKTRONIK
• Development and production of sensors and transmitters for: – humidity
– dew point
– CO2
– O2
– air velocity
– mass flow measurement
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Thermal Mass Flow Meter
Gas flow measurement The thermal measurement principle
Adjustment under pressure Applications for thermal flow meters
E+E accredited laboratory for flow Type of flow meters
Unique mounting features
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Gas flow measurement
Measuring the quantity of a gas flowing through a defined area in a defined amount of time
Quantity Number of molecules
Area e.g. m2
Velocity e.g. m/s
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Gas flow measurement
Quantity
Volumetric flow m3/h, l/min, CFPM
3600][]/[]/[ 23 mAsmvhmQ
]/[]/[]/[ 33 mkghmQhkgm
Mass flow kg/h
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Gas flow measurement
• Standard conditions (ISO 10780:1994) – temperature: 0 °C = 273.15 K
– pressure: 1.01325 bar = 1013.25 hPa
1.3 kg
0°C
1013.25 mbar
Standard volume
1.3 kg 0°C
10bar
100°C
5bar
Actual volume
0.1 m3
0.28 m3
1.3 kg
1 m3
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Thermal measurement principle
Hot film anemometer principle Heat dissipation due to enveloping gas flow
Heat dissipation depends on the “number of molecules” flowing past.
Direct mass flow measurement
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Thermal measurement principle
Hot Film Anemometer
Rh: thin-film resistor – electrically heated Ra: thin-film resistor – gas temparature
ΔT between Rh and Ra = constant
Ih
Rh
Ra
m .
m: mass flow .
Ih: heating current
Ra Rh
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Thermal Mass flow sensor
Sensor element
Baffle / protection bar
Stainless steel body
The baffle protects the sensor element from damage by dirt and other objects. It also ensures a defined flow of the sensor element which remains to a low angular dependence.
The thin sensor element is due to the small surface insensitive to dirt and has a very fast response time.
A very good mechanical protection and the small flow restriction leads to a low presser loss in the application.
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Thermal measurement principle
• Advantages of thermal flow meters – No moving parts
– High measurement accuracy
– Extremely wide span
– Minimum pressure drop due to compact design
– Fast response time
– Insensitive to vibrations
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Adjustment under pressure • Application-dependent adjustment
– The flow meter is adjusted under pressure
– Adjustment in the mounting valve / pipe line
– Calibration certificate included as standard
Reference measures the standardized volume flow [Nm3/h]
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Applications – thermal flow meter
• Mass air flow sensor for automotive engines
• Compressed air consumption measurement
• Gas flow measurement in the
– Chemical industry
– Process industry
• CO2 measurement in breweries
• Air measurement in sewage treatment plants
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Flow calibration - ÖKD
• E+E Elektronik operates a government-accredited calibration lab (ÖKD) in accordance with EN ISO/IEC 17025.
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Flow calibration - ÖKD
• Calibration range: 0.8 to 2300 kg/h
• Pressure: 1 to 10 bar
• measuring uncertainty: 0.003 m3/h + 0,9% of measured value.
ÖKD Calibration has worldwide recognition It is the same as NMI calibration in the Nederland's
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Type of flowmeters
Mechanical Pressure Optical Thermal mass flow Vortex Electromagnetic, ultrasound and coriolis
In-line Insertion
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The mounting ball valve
Flowmeter =
= +
transmitter + mounting valve
The mounting valve assembly allows for the easy and reliable installation within the pipeline. The high measurement accuracy is guaranteed by the accurate, reproducible positioning of the probe within the mounting valve.
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• Unique installation concept – The sensor can only be installed at precisely one position and depth.
The mounting ball valve
Sealing cone
Locking pin (key)
Sensor
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The mounting ball valve
For dismounting of many other units on the market you have to cut the pipe.
Installation and removal with just a brief interruption of the flow in less then 30 seconds!
Operating without flow meter
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Customer Value
• Possibility for regularly calibration
• Very easy and time saving mounting
• Very service friendly
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Non-return protection
YES NO
Non-return protection device for insertion flow meters The sensor can only be pushed in one direction during installation. The sensor will not move back at all, even when it is released.
unlock YES
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Non-return protection Precise positioning The precise positioning with respect to immersion depth and orientation is easy to perform, guaranteeing accurate measurement results.
Flow direction
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Sensor retraction tool
• Remove without flow interruption!
measuring remove
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Customer Value
• Absolutely secure mounting
• Assembly/disassembly under pressure without flow interruption Possibility for regularly calibration
• Easy and accurate positioning for precise measurement
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Questions and answers