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ALRE WSERD Flow Switch

The WSERD air flow monitor is suitable for monitoring fans, control flaps, humidifiers and electrical heating registers in accordance with DIN 57100, Part 420 and for use with DDC systems. The air flow monitor works according to the calorimetric principle. The extraction of heat by the air flow is measured and converted into the switching value. The sensor contains a heating element and two temperature sensors. A microcontroller controls the heating and measures the temperature differences. From the stored calibration curves, it calculates the air flow speed and transmits the value serially to the control unit. Here another microcontroller determines the switching behavior of the two relays from the default values ​​of the setting controls.

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Made in Germany. brand ALRE, model WSERD

International delivery to United Arab Emirates, Kuwait, Qatar, Saudi Arabia, Saudi Arabia, Bahrain, Oman and other Middle Eastern countries.
Our warehouses are located in UAE.

price by request

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Our company is a UAE supplier of control and measuring instruments from well-known world brands

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Fast delivery across the Middle East

Supply to United Arab Emirates, Kuwait, Qatar, Saudi Arabia, Bahrain, Oman and other countries

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Technical specifications of ALRE WSERD

Type 534.446 134.446
Articlenumber G8000429 G8000428
Adjustable tripping value for flow with fluids 0,2 m/s
Adjustable tripping value for flow with gases 10 m/s 10 m/s
Ambient temp. for evaluation electronics from 0 °C
Ambient temp. for evaluation electronics up to 50 °C
Bearing temperature, lower value -10 °C
Bearing temperature, upper value 70 °C 75 °C
Can be read off No
Degree of contamination 2
Depth 85 mm
Electric connection Screw terminals
Height 69 mm
Housing material Plastic
Included with probe Yes
Length of sensor 165 mm
Max. sensor temperature 90 °C
Maximum switching current 8 A
Maximum switching voltage 230 V AC, 50 Hz
Medium Air, not aggressive
Medium temperature -20 °C
Min. sensor temperature -20 K
Number of switching stages 10
On-delay time 120 s
Operating voltage 100-240 VAC oder 24 V AC / DC
Potential free switching contact Yes
Probe integrated in the device Yes No
Protection class II, following appropriate mounting
Rated impulse voltage 4000 V
Sensor element Hot film anemometer
Switching contact 2 two-way contacts
Switching difference, can be adjusted Yes
Transistor output 15 s
Type of protection IP65 housing side, IP 54 sensor
Width 136 mm
Wire break or measurement circuit monitoring 20 s
With display No
With explosion protection No
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User Guide and Instruction manual for ALRE WSERD

You can request the necessary certificates, documentation, instructions and user guide for ALRE WSERD using the special form.

You can buy ALRE WSERD in UAE at a favourable price in «Texair FZCO» by leaving a request on the website, by phone +441225535040 or by email . ALRE WSERD price are subject to change depending on exchange rates. We deliver instruments by transport companies in United Arab Emirates, Kuwait, Qatar, Saudi Arabia, Saudi Arabia, Bahrain and other Middle Eastern countries.

See also: Flow Switches