No inlet section necessary - integrated flow straightener - sensor unit removable

The newly developed VA 521 combines modern digital interfaces for connection to energy monitoring systems with a small, compact design. The VA 521 is always used when many machines (compressed air consumers) are to be integrated into an energy monitoring network.

Readout values in the display can be rotated by 180º, e.g. for overhead installation

The sensor can be removed from the measuring section and cleaned.
Unit of Measure
Items
VA 521 Compact Inline Flowmeters for Compressed Air and Other Types of Gas

VA 521 G 1/2 Inch (in) Thread Size Compact Inline Flowmeter
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VA 521 Compact Inline Flowmeters for Compressed Air and Other Types of Gas

VA 521 G 3/4 Inch (in) Thread Size Compact Inline Flowmeter
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VA 521 Compact Inline Flowmeters for Compressed Air and Other Types of Gas

VA 521 G 1 Inch (in) Thread Size Compact Inline Flowmeter
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VA 521 Compact Inline Flowmeters for Compressed Air and Other Types of Gas

VA 521 G 1-1/4 Inch (in) Thread Size Compact Inline Flowmeter
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VA 521 Compact Inline Flowmeters for Compressed Air and Other Types of Gas

VA 521 G 1-1/2 Inch (in) Thread Size Compact Inline Flowmeter
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Description N/A No inlet section necessary - integrated flow straightener - sensor unit removable

The newly developed VA 521 combines modern digital interfaces for connection to energy monitoring systems with a small, compact design. The VA 521 is always used when many machines (compressed air consumers) are to be integrated into an energy monitoring network.

Readout values in the display can be rotated by 180º, e.g. for overhead installation

The sensor can be removed from the measuring section and cleaned.
Approve Payments N/A Finance with Approve Payments

Parameters N/A m³/h, CFM (1000 mbar, 20 ºC) in case of compressed air or Nm³/h, Nl/min (1013 mbar, 0 ºC) in case of gases
Measuring Section N/A DN15 N/A DN20 N/A DN25 N/A DN32 N/A DN40
Thread Size N/A G 1/2 in. N/A G 3/4 in. N/A G 1 in. N/A G 1-1/4 in. N/A G 1-1/2 in.
Measuring Range Full Scales N/A 90 m³/h50 ft³/min N/A 170 m³/h100 ft³/min N/A 290 m³/h170 ft³/min N/A 530 m³/h310 ft³/min N/A 730 m³/h430 ft³/min
Dimension L N/A 135 mm
Dimension B N/A 55 mm N/A 55 mm N/A 55 mm N/A 80 mm N/A 80 mm
Dimension H1 N/A 50 mm N/A 50 mm N/A 50 mm N/A 80 mm N/A 80 mm
Dimension H N/A 109.65 mm N/A 109.65 mm N/A 109.65 mm N/A 215.45 mm N/A 215.45 mm
Dimension A1 N/A 25 mm N/A 26 mm N/A 33 mm N/A 35 mm N/A 36 mm
Dimension A N/A 20 mm N/A 20 mm N/A 25 mm N/A 25 mm N/A 25 mm
Note for Measuring Range N/A Flow measuring ranges VA 521 (max version 185 m/s) for compressed air (ISO 1217:1000 mbar, 20 ºC)
Measuring ranges for other types of gas.
Units Adjustable Via Keys at Display N/A CFM ft/min g/s kg/h kg/min l/s lb/h lb/min m/s m³/h m³/min
Sensor N/A Thermal Mass Flow Sensor
Measured Medium N/A Air Gases
Gas Types are Adjustable Over CS Service Software or CS Data Logger N/A Air Argon CO2 Nitrogen Oxygen
Accuracy N/A ± 0.3% of Full Scale (F.S.) ± 1.5% of Measured Value (M.V.)
Accuracy on Request N/A ± 1.0% of Measured Value (M.V.) ± 0.3% of Full Scale (F.S.)
Operating Temperature N/A -22 to 176 ºF
Operating Temperature with Pressure Sensor N/A -25 to 349 ºF
Operating Pressure N/A Up to 232 psi
Optional Pressure N/A Up to 580 psi
Digital Output N/A Modbus-Remote Terminal Unit (RTU) RS 485 Interface
Optional Digital Output N/A Ethernet Interface M-Bus Power over Ethernet (PoE)
Analog Output for Cubic Feet Per Minute (CFM) N/A 4 to 20 mA
Pulse Output N/A 1 pulse per CF or per liter electrically isolated. Pulse weight can be set on the display. Alternatively, the pulse output can be used as an alarm relay.
Direct Current (DC) Supply Voltage N/A 18 to 36 V
Power Supply N/A 5 W
Burden N/A <500 Ω
Housing Material N/A Polycarbonate
Protection Rating N/A Ingress Protection (IP 65)
Material N/A Aluminum Stainless Steel 316L
Mounting Position N/A Any
Display Shows 2 Values at The Same Time N/A
  • Present flow in, CFM, l/min/m³/min
  • Total consumption (counter reading) in CF, l, kg
  • Temperature measurement
Screw-In Thread N/A Easy installation into the existing pipe due to integrated measuring section (suitable for 1/2", 3/4", 1", 1 1/4", 1 1/2" or 2" lines)
Advantages at a Glance N/A
  • Compact, small design - for use in machines, behind maintenance unit on the end user
  • All interfaces are freely programmable via the display
  • Modbus-RTU output
  • 4 to 20 mA analog output for present flow
  • Pulse output total flow (counter reading), electrically isolated. Optional: M-Bus, Ethernet interface or PoE
  • New: Integrated pressure sensor (optional)
With a Key Stroke N/A
  • Reset counter reading
  • Select units
  • Parameterise interfaces