VA 550 / VA 570 Explosive Area Gas flow meter cs instrument


CS Instrument Flow Meter | Thermal Mass Flow Meter | gas flow meter

VA 550 / VA 570 Explosive Area Gas flow meter cs instrument

CS Instrument Model VA 550/ VA 570 mass flow meter

The new flow meters VA 550/ 570 work according to the calorimetric measuring principle. Therefore an additional temperature and pressure compensation are not necessary.

Due to its robust design, the aluminum die-cast housing, the robust sensor tip made from stainless steel 1,4571, the new VA 550/ 570 is suitable for demanding industrial applications. An ATEX version is available for applications in explosive areas. For flow measurement e. g. of natural gas there is a version with a DVWG admission.

Contrary to the previously used bridge circuit the newly developed evaluation electronics records all measured values digitally. This allows very precise and fast measurements with a wide temperature range of up to 180 °C (resp. 350 °C). The measuring span is 1 - 1000 and enables, therefore, measurements in very low as well as a very high flow speeds of up to 224 m/s.

Simple operation and flexible interface

VA 550/ 570 has an integrated Modbus output as a standard with which all parameters like Nm³/h, Nm³, Nm/s, Nl/min, Nl/s, kg/h, kg/min, ft/min, °C, etc. can be transferred.

All parameters can be adjusted directly at the instrument (via a display) or via the PI 500 hand-held measuring instrument resp. Service Software. Of course, there are also 2 x 4 - 20 mA analog outputs available for flow and temperature and a galvanically isolated pulse output for the total consumption.

A remote diagnosis can be carried out via Modbus and all relevant parameters can be checked and changed if necessary. So it is possible to change e. g. the gas type, the inner diameter, the scaling and so on or the zero point resp. the leak flow volume suppression in case of changed process conditions.

Via remote diagnosis and status update e. g. temperature exceeding, failures of the flow sensor or the calibration data can be determined.


Measuring range
up to 50 Nm/s, Low-Speed version*
up to 92,7 Nm/s, Standard version*
up to 185 Nm/s, Max version*
up to 224 Nm/s, High-Speed version*
* Measuring range Nm³ / h for different pipe diameters and gases, see table measuring ranges flow
* All measurements related to DIN 1343 standard conditions 0 ° and 1013 mbar ex-works


accuracy class
(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.
Accuracy indications:
referred to ambient temperature 22 °C
± 2°C, system pressure 6 bar
Repeatability:0.25 % of m.v. in case of correct mounting (mounting aid, position, inlet section)
Measuring principle:Thermal mass flow sensor
Response time:t90 < 3 s
Operating temperature range probe tube/display unit:
-40...180 °C probe tube
-40...70 °C display unit
-40...120 °C for ATEX version
Adjustment possibilities via display, external hand-held meter PI 500, PC Service Software, remote diagnosis:Nm³/h, Nm³/min, Nl/min, l/s, ft/min,cfm, kg/h, kg/min, inside diameter, reference conditions ° C/° F,mbar/hPa, zero point correction, low flow cut off, scaling Analog output 4 ... 20 mA, pulse/alarm, error codes etc.
Standard: 1 x 4 ... 20 mA analog output (not electrically isolated), pulse output, RS 485 (Modbus RTU)
Optional: 2 x 4 ... 20 mA active, ModbusTCP, HART, Profibus DP, Profinet, M-Bus
Burden:< 500 Ohm
Additional average value
for all parameters freely adjustable from 1 minute up to 1 day, e. g. 1/2 hours average value, average day value
Protection class:IP 67
Material:Housing aluminum die-cast, probe tube stainless steel 1,4571
Operating pressure

VA 550: 50 bar; in special version 100 bar (with DVGW approval a maximum of 16 bar)

VA 570: 16 bar, in special version 40 bar

Power supply:18...36 VDC, 5 W
Approval:ATEX II 2G Ex d IIC T4, DVGW

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