Mass Flow Sensors - VD 550

CS INSTRUMENTS GmbH & Co. KG

Unique sensitivity in the lower measuring range, measuring from 2 m/s
Suitable for extremely high flow rates
Measures flow, total consumption, temperature, and pressure
Robust impact-proof aluminum die-cast housing for outdoor use, IP67
Differential-pressure measuring principle

The VD 550 is a robust differential-pressure flow sensor for wet compressed air and gases. It measures flow, total consumption, temperature, and pressure, with measuring ranges of 2–224 m/s or 600 m/s for compressed air and 0.04–500 mbar differential pressure for gases. It is suitable for wet air, technical gases, mixed gases such as natural gas/H2, LPG, propane, and CO2, and the selectable gas-type list includes hydrogen (H2). The sensor supports medium temperatures from −30 to +180 °C, operating pressure from −1 to +100 bar(g), ambient temperature from −20 to +70 °C, and has an IP67 aluminum die-cast housing. It provides 4–20 mA, pulse output, and RS 485 Modbus-RTU, with optional Ethernet, PoE, M-Bus, HART, and IO-Link interfaces.

Use Cases

Measurement of compressor capacity
Efficiency measurement of compressed air systems
Flow measurement in technical gases
Flow measurement in mixed gases, including natural gas/H2 mixtures
Flow measurement for LPG, propane, CO2, and selectable hydrogen gas configurations

Capabilities

Measures gas velocity using differential pressure/dynamic pressure at the sensor tip
Determines flow using the measured pressure and pipe diameter
Measures temperature and absolute pressure for density calculation across different gases, temperatures, and pressures
Supports RS 485 Modbus-RTU communication as standard
Optional interfaces include Ethernet Modbus/TCP, Ethernet PoE, M-Bus, HART, and IO-Link
Supports real-gas calibration in selected gas types as an order option

CS INSTRUMENTS GmbH & Co. KG CS INSTRUMENTS is a specialized manufacturer of advanced measurement technology for compressed air and industrial gases. They provide high-precision sensors for flow measurement, dew point monitoring, and leak detection. In the hydrogen industry, their equipment helps facilities accurately track gas consumption, monitor line purity, and ensure safety across distribution networks.

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