CS VA 500/ VA 570 Modbust RTU Ouput

CS Instrument

Thermal Mass Flow Meter

In line Flow Meter

Insertion Flow Meter

Model VA 500/ VA 520

Our affordable mass flow meter for compressed air and gases works according to the approved calorimetric measuring principle. An additonal pressure and temperature compenstation is not necessary. Contrary to the previously used bridge circuit the newly developed evaluation electronics records all measured values digitally. This enables very precise and fast measurements.

Due to the new evaluation electronics, all VA 500/ VA 520 models have an integrated Modbus output as a standard. So all parameters can be easily transferred via Modbus. 


Due to its compact design it is possible to monitor all compressed air systems from the compressor to the smallest compressed air tool (1/4“ to 2 inch) with the new mass flow sensor VA 520. VA 500 flow sensors are available for larger pipe diameters from DN 50 to DN 300. Apart from compressed air also other gases like e.g. nitrogen, oxygen and CO2 can be measured.


Model VA 500 VA520
Insertion In line Flange In line Pipe Thread
Parameters m³/h, l/min (1000 mbar, 20 °C) in case of compressed air resp. Nm³/h, Nl/min (1013 mbar, 0 °C) in case of gases
Units adjustable via keys at display m³/h, m³/min, l/min, l/s, ft/min, cfm,m/s, kg/h, kg/min, g/s,lb/min, lb/h
Sensor Thermal mass flow sensor
Measuring medium Air, gases
Gas types are adjustable over CS service software or CS data logger Air, nitrogen, argon, helium, CO2,oxygen, vacuum
(m.v.: of meas. value)
(f.s.: of full scale)
± 1.5 % of m.v. ± 0.3 % of f.s.
on request
± 1.0 % of m.v. ± 0.3 % of f.s.
Operating temperature:
-30…110 °C probe tube
-30…80 °C housing
-30…80 °C
Operating pressure -1…50 bar -1 to 16 bar optional to PN 40
Digital output
RS 485 interface (Modbus-RTU),
Ethernet-Interface PoE), M-Bus
Analog output 4…20 mA for m³/h e. g. l/min
Pulse output
1 Pulse per m³ or per liter galvani – cally isolated. Pulse value can be set on the display. Alternatively, the pulse output can be used as an alarm relay
Supply 18…36 VDC, 5 W
Burden < 500 Ω
Housing Polycarbonate (IP 65)
Probe tube
Stainless steel, 1.4301
Mounting length 220 mm,
Ø 10 mm
Mounting thread G 1/2“
Ø Casing 65 mm
Measuring section N/A
Stainless steel, 1.4301 or 1.4571
Process connection N/A
Flange (to DIN EN 1092-1
e. g. ANSI 150 Ibs or
ANSI 300 Ibs)
R 1/4“ to R 2“ (BSP British
Standard Piping) or
to 2“ NPT-thread
Mounting position Anything

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