Detect overflows in cleanroom and industrial applications with maximum measurement accuracy

Detect overflows in cleanroom and industrial applications with maximum measurement accuracy

SCHMIDT® Flow Sensors SS 20.400 and their ATEX counterpart SS 23.400 detect even the smallest airflows from 0.05 m/s. They also feature integrated direction detection. In addition to pressure measurement, the bidirectional flow sensors can reliably detect existing overflows in cleanrooms or controlled environments. If backflows occur, leading to contamination entry, this is also reliably detected.

Upon request, the sensors are supplied with high-precision calibration. This includes further improvement of accuracy through increased calibration points and the documentation of target and actual values as an ISO calibration protocol. The measurement accuracy is then ±1% of the measured value plus 0.04 m/s.

For laminar flow applications, the sensors are now calibrated in a vertical flow channel. Its design guarantees a downward airflow, as ideally should prevail in practical applications, and excludes all external influences from actual measurement practice on site. This also accounts for so-called thermal convection flow, which in practice makes up about 10% of the flow at 0.45 m/s.

The ATEX version SS 23.400 for use in explosion hazard areas complies with the ATEX Directive 94/9/EC. The flow sensors are DEKRA-certified and can be used in Zone 2 (Equipment Category 3G) without additional measures, such as a Zener barrier.

How the bidirectional measurement with thermal flow sensors works is described in a brochure.