CS Instruments – VA 521

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Thermal mass flow meter with integrated flow straightener (no inlet section required), removable sensor, and modern digital interfaces for energy monitoring.

Measuring principle Thermal mass flow
Measured values Flow, total consumption, temperature
Installation 1/2" to 2" (G or NPT), integrated section
Interfaces Modbus RTU (RS-485), 4–20 mA, pulse output
Options M-Bus / Ethernet / PoE, integrated pressure sensor
Pressure range up to 16 bar, optional up to 40 bar
Measuring principle Thermal mass flow
Measured values Flow, total consumption, temperature
Installation 1/2" to 2" (G or NPT), integrated section
Interfaces Modbus RTU (RS-485), 4–20 mA, pulse output
Options M-Bus / Ethernet / PoE, integrated pressure sensor
Pressure range up to 16 bar, optional up to 40 bar
Request a quoteDownload brochure
Standard equipment 1 · Options 3 · Accessories 3
  • VA 521 compact inline meterThermal mass flow meter with integrated measuring section, display, and standard industrial outputs.
ParameterDN 15DN 20DN 25DN 32DN 40DN 50
SensorThermal mass flow sensor
Measured mediumAir, gases
Accuracy (standard)± 1.5% of reading ± 0.3% full scale
Operating temperature [°C]-30 … +80
Operating pressure [bar(g)]up to 16 (optional up to 40)
Digital interfacesRS-485 (Modbus RTU); optional M-Bus, Ethernet, Ethernet PoE
Analog output4–20 mA
Pulse outputPulse output configurable by display
Power supply18 … 36 VDC, 5 W
HousingPolycarbonate (IP65)

Compact inline flow meter

Compact and rugged design enables installation directly in machines, service units, or near compressed air consumers.

No inlet section required

Integrated flow straightener provides accurate readings without long straight pipe runs before the sensor.

Rotatable display

Display can rotate by 180° for excellent readability even in overhead or non-standard mounting positions.

Multiple measured values

Simultaneous display of flow, total consumption, and temperature enables comprehensive compressed air monitoring.

Industrial communication interfaces

Standard Modbus RTU, 4–20 mA, and pulse output; optional M-Bus, Ethernet, and PoE for easy integration.

Energy and industrial processes

Energy sector

Energy monitoring

Reliable air and gas flow measurement to support energy monitoring and process efficiency improvements.

Compressor station

Compressor stations (FAD)

Point-of-use consumption

Flow measurement directly in pipelines, including during operation.

Chemical industry

Chemical industry

Process measurement

Accurate technical gas flow measurement for stable and safe chemical processes.

Contact

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Pod lipami 4 · 1370 Logatec, Slovenija

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