VA 525

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Compact Inline Flow Meter for Compressed Air & Gases

The newly developed VA 525 combines modern digital interfaces for connection to an energy monitoring system with a small, compact design. Due to its reasonable price and modern digital interfaces this compact in-line flow sensor is used when many machines (compressed air consumers) are to be integrated as easily as possible into an energy monitoring network.

The high-contrast, integrated display also displays the current values rotated by 180° if desired (very useful for overhead installation). Depending on the configuration, two of the following values can be displayed:

Current consumption in m³/h, l / min, ...
Total consumption (meter reading) in m³, l, kg
Temperature measurement
Optional: Pressure measurement

Special Features

Compact, small design - for use in machines, behind maintenance unit at the end user
RS 485 interface, Modbus-RTU as a standard
With integrated flow straightener
Measuring unit selectable via keypad (m3/h, m3/min, l/min, l/s, kg/h, kg/min, kg/s, cfm)
Accuracy +/- 1.5% of m.v +/- 0.3% of full scale
Consumption counter resettable to ZERO via keypad
No additional temperature or pressure sensors necessary
Optionally with classic analogue signals (4...20 mA and pulse) or digital interfaces such as Modbus RTU, Ethernet (also PoE), M-Bus
All interfaces are programmable via the display

Application

Sub-metering of compressed air or industrial gas at end use
CDA and nitrogen consumption monitoring at point of use
Leakage detection
Energy monitoring
Cost allocation
Nitrogen generator, oxygen generator, adsorption dryer, pneumatic equipment…

With integrated display

The sensor can be removed from the measuring section and cleaned.

With integrated flow straightener

Technical Data

Measuring range	50 Nm/s, low-speed version 92.7 Nm/s, standard version 185 Nm/s, max. version 224 Nm/s, high-speed version
Measuring principle	Thermal mass flow sensor
Measuring parameters	Flow, consumption, flow speed and temperature
Accuracy class (m.v. = of measured value) (f.s. = of full scale)	± 1.5 % of m.v. ± 0.3 % of f.s. ± 1.0 % of m.v. ± 0.3 % of f.s. (On request)
Measuring medium	Air and non-corrosive gases (nitrogen, argon, helium, CO2, oxygen)
Measuring units	m3/h, m3/min, l/min, Nm3/h, Nm3/min, Nl/min, cfm, kg/h, kg/min, etc…
Display	1.8” TFT colour display (220 x 176)
Response time	t 90 < 3 s
Operating pressure	Up to 16 bar
Operating temperature	-30...60 °C
Outputs	Standard : RS 485 (Modbus-RTU) or 4…20mA Optional : Ethernet interface (Modbus-TCP, PoE, M-Bus
Wiring connection	M12 x 2, 5 pores, (M12 connector x2 is included)
Power supply	18...36 VDC, 5 W
Burden	< 500 ohm
Materials	Housing - Polycarbonate / Measuring Section - Aluminium
Protection class	IP 65
Connection	Thread : G ¼” to 2”, NPT ½” – 2”(On request)

Dimension

Connection		Measuring Range		L (mm)	B (mm)	H1 (mm)	H (mm)	A (mm)
DN 8	G ¼”	105 l/min	3.6 cfm	135	55	50	109.1	15
DN 15	G ½”	90 m3/h	50 cfm	135	55	50	109.1	20
DN 20	G ¾”	170 m3/h	100 cfm	135	55	50	109.1	20
DN 25	G 1”	290 m3/h	170 cfm	135	80	80	109.1	25
DN 32	G ¼”	530 m3/h	310 cfm	135	80	80	139.1	25
DN 40	G 1 ½”	730 m3/h	430 cfm	135	80	80	139.1	25
DN 50	G 2”	1195 m3/h	700 cfm	135	80	80	139.1	30

Product Information

VA 525 Data Sheet