Schmidt sensor goes with the flow

Published: 5-Feb-2007


German firm Schmidt has launched the Flow Sensor SS 20.415 - a highly specialised sensor for laminar-flow monitoring in cleanrooms.

The sensor is based on the principle of a thermal anemometer and can measure the flow velocity in two directions and can precisely detect the flow direction. The housing of the sensor is a thin stainless steel pipe measuring only 9mm in diameter. The complete electronic - based on a microprocessor - is located inside this small pipe.

The sensor is robust due to a metal chamber in which the sensing element is protected against impacts, the company says. Beneath the analogue output this sensor offers two digital outputs to indicate the flow direction and that flow reaches a preselected switching level.

The sensor comes with the Schmidt Cleanroom Quick Mounting System: a mounting adaptor made of stainless steel, which is mounted onto a wall or ceiling. After inserting the sensor into this adaptor the sensor gets automatically into the right position in regard to the filter outlet. Schmidt offers the mounting adaptors in different versions fitting to all standard cleanroom ceiling systems.

The sensor's housing is completely tight and can be sterilised during operation with alcohol or hydrogen peroxide. The sensor starts to measure from a velocity of 0.05 m/s. Schmidt operates also a high precision wind tunnel and thus offers a calibration certificate for this sensor which is traceable to national standards.

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