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VA 521 - Compact Inline flow meter for compressed air and other gas types

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PRODUCT DETAILS

This compact thermal mass flow meter measures the mass flow rate and provides a direct output of standardized volume flow rate without requiring additional pressure or temperature measurement. Thanks to the integrated thermal mass flow principle, compensation is automatic and highly accurate.

The device is specifically designed for installation in confined spaces. An integrated flow straightener eliminates the need for inlet and outlet sections, allowing flexible installation even in challenging pipe layouts.

The sensor can be easily installed and removed, while the integrated measuring section remains in the pipeline during cleaning or recalibration and can be securely closed using a sealing cap. With no moving parts, the instrument offers low maintenance requirements and long-term reliability.

It is suitable for compressed air and non-corrosive gases such as nitrogen, oxygen, argon, and helium.

KEY FEATURES & BENEFITS

Direct mass flow measurement with standardized volume flow output

No additional pressure or temperature measurement required

Compact design for limited installation space

Integrated flow straightener – no inlet or outlet sections required

High accuracy at both low and high flow rates

Easy sensor installation and removal

Measuring section remains installed during service

No moving parts for low maintenance

TECHNICAL SPECIFICATIONS

Pressure range: up to 40 bar

Temperature range: up to 80 °C

Flow velocity: up to 224 Nm/s

Pipe sizes: ½" to 2"

Measurement accuracy:

±1.5% or ±1% of measured value

plus ±0.3% of final value

OUTPUTS & INTERFACES

Standard interfaces:

4...20 mA analogue output

Pulse output

Modbus RTU (RS 485)

Optional interfaces:

Modbus TCP (Ethernet)

Power over Ethernet (PoE)

M-Bus

DISPLAY & OPERATION

Integrated display for measured values

Parameter settings adjustable via display keys

Main counter reset directly via the display

Name File Name
Data_sheet_accessories_flow_EN (4) Data_sheet_accessories_flow_EN (4).pdf
Data_sheet_VA521_EN Data_sheet_VA521_EN.pdf
overview_of_products_VAxx_EN (4) overview_of_products_VAxx_EN (4).pdf

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