Mass Flow Sensors - VA 550

CS INSTRUMENTS GmbH & Co. KG

Insertion-type thermal mass flow sensor for compressed air and gases
Measures flow, total consumption, velocity, and temperature
Pressure range up to 50 bar, special version up to 100 bar
Media temperature range up to 180 °C
Robust impact-proof aluminum die-cast housing, IP67
All wetted parts made from stainless steel
No moving parts and no wear
ATEX, IECEx, DVGW, and cULus-listed versions/options

The VA 550 is an insertion-type thermal mass flow meter for installation in existing compressed air or gas lines from 3/4″ to >DN 1000. It measures flow, total consumption, velocity, and temperature, with configurable gas types including compressed air, nitrogen, argon, carbon dioxide, oxygen, nitrous oxide, natural gas, helium, propane, methane, biogas, and hydrogen (H2). The sensor has no moving parts, negligible pressure loss, stainless-steel wetted parts, and a robust aluminum die-cast housing. It supports measurement ranges up to 224 m/s, operating pressure up to 50 bar as standard or 100 bar special version, and media temperatures up to 180 °C. Standard outputs include 4–20 mA, pulse output, and RS 485 Modbus-RTU, with optional Ethernet Modbus-TCP, PoE, M-Bus, HART, Profibus DP, Profinet, and IO-Link.

Use Cases

Flow measurement in existing compressed air lines
Flow measurement in industrial gas lines
Hydrogen gas flow measurement, with real-gas adjustment required for H2
Natural gas flow measurement, with optional DVGW approval up to 16 bar
Compressor and compressed-air system monitoring
Outdoor compressed-air and gas measurement applications
Applications requiring remote access via Modbus, Ethernet, HART, M-Bus, Profibus, Profinet, or IO-Link

Capabilities

Measures thermal mass flow in compressed air and gases
Displays four measured values: flow, total consumption, velocity, and temperature
Provides access to measured values and settings via Modbus-RTU
Supports configuration and diagnostics through the display, PI 500 hand-held device, PC service software, or remote diagnosis
Supports selectable gas types including hydrogen (H2)
Supports real-gas adjustment for selected gas types
Can be installed or removed under pressure without disconnecting or emptying the line
Supports optional integrated pressure sensor configurations for selected versions
Supports optional bus and digital interfaces: Ethernet Modbus-TCP, PoE, M-Bus, HART, IO-Link, Profibus DP, and Profinet

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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