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CS Instruments VA 520 - Flow meter for compressed air and gases

  • Very low pressure drop
  • For pipe sizes DN8 to DN80
  • Measurement of mass flow with direct output of standard volumetirc flow

The CS Instruments VA-520 air flow meter builds on the CS instruments VA 500. The VA-520 meter utilises the calorimetric measuring principle. Due to their compact design it is possible to monitor all compressed air (or other process gases) data from a system be it the smallest compressed air tool to the actual compressor (DN8 to DN80).

The device is supplied with threaded or flanged inserts to make installation a quick and easy task.

By fitting the sensor with quick release couplings, the VA-520 becomes a mobile service tool for fast local no fuss monitoring.

The measurement electronics can be easily removed from the piping section for periodic maintenance, additionally it can be rotated through 180° if a bi-directional measurement is required

For permanent installation it is possible to transfer data to a building management system or PLC with the 4-20mA output for actual flow.

If totalising is required then the Pulse output (galvanically separated) should be selected from the device.

Digital communications is provided with the standard Modbus RTU (RS 485) interface or the optional Modbus TCP (Ethernet), PoE, M-Bus.

The VA 520 is ideal for monitoring compressed air consumption and system balancing including leak analysis. It is also ideal for monitoring of expensive process gases like nitrogen, CO2, oxygen or argon.

The versatility of the in head display keypad offers a variety of meter selectable values, m³/h, m³/min, l/min, l/s, kg/h, kg/min, kg/s, cfm. There is also a resettable zero for totalised flow via the keypad. The supplied software enables alternative gas selection (nitrogen, oxygen, CO2, and argon) without the need for recalibration.

Typical accuracy

Stated at ± 1.5% of m.v. ± 0.3 % of f.s with optional accuracy available of ± 1% of m.v. ± 0.3 % of f.s.

Gas temperature and operating range

From -30°c to +80°c

Operating pressures

Between -1 and +16 bar optionally or up to PN40.

Measuring ranges

Standard instruments are configured for a maximum velocity of 92.7 MPS (metres per second), low flow (50 MPS), high-flow (224 MPS) and configurations are also available.

Key specifications

Measuring rangesLow-Speed (50 m/s)
Standard (92.7 m/s)
High-Speed (224 m/s)
Measured mediumAir, gases
Gas types are adjustable over CS service software or CS data loggerAir, nitrogen, argon, CO2, oxygen
Accuracy: (m.v.: of meas. value) (f.s.: of full scale)± 1.5% of m.v. ± 0.3% of f.s.
on request: ± 1% of m.v. ± 0.3% of f.s.
Operating temperature-30...110 °C sensor tube
-30...+80 °C housing
Operating pressure-1 to 16 bar optionally up to PN 40
Process connectionFlange (in acc. with DIN EN 1092-1 or ANSI 150 Ibs or ANSI 300 Ibs)

Data sheets and manuals

Other features

  • 5 point ISO calibration certificate optional
  • Gas mixture and real gas adjustment optional
  • Special cleaning oil and grease free optional (e.g. for oxygen applications)
  • LABS and silicone-free version including cleaning oil and grease-free optional
  • DN or ANSI flanged connections available

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CS Instruments