Bullet Sensors & Transducers e-Digest, Vol. 83, Issue 9, September 2007: Product News

    (ISSN 1726- 5479)


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Wet/Wet Differential Pressure Sensor Ideal for Monitoring Cleanliness of Filtration Systems



Mount Olive, NJ, American Sensor Technologies offers a wet/wet differential pressure sensor ideal for monitoring the cleanliness of filters in either liquid or gas applications. When installed within a water filtration system, the Model 5000 Wet/Wet Differential Pressure Sensor can detect the difference between the upstream pressure, that drives the water through the filter, and the downstream pressure, that leads the filtered water through the system, to notify the system when the filter is clogged.


For example, in a 100 PSI pump using a filter to purify water for drinking, if the pressure in the downstream side of the system drops to 80 PSI, the filter should be changed. With a 24 VDC supply powering the Model 5000 wet/wet different pressure sensor and a selected 4-20 mA output signal, the sensor can be calibrated with a 100 PSI line pressure and a 20 PSI differential pressure.


When the water filtration system is operating with a clean filter, the output signal will be 4 mA. As the pressure decreases on the downstream, the output signal will increase. Once the downstream pressure decreases to 80 PSI, the sensorís output signal will reach the full scale of 20  mA. When connected to a controller, the operator understands when to replace the filter.


In addition to featuring highly accurate output of differential pressure, the Model 5000 is constructed of 316L stainless steel wetted materials that resist hydrogen embrittlement to ensure the highest reliability in a variety of media. This design also provides excellent overrange and burst protection (5x rated line pressure or 2,000 PSI, whichever is less) ratings for system safety in the most extreme conditions. Featuring ASTís Krystal Bondô Technology, the Model 5000 does not contain internal O-rings or fluid-filled cavities, eliminating the chance of outside media permeation or system contamination from silicone oil.


Voltage and current outputs are available over a wide operating temperature range of -40 to 850C (-40 to 1850F). Accuracy specifications are < 0.3% BFSL, including non-linearity, hysteresis, and non-repeatability.

Differential pressure sensor



Karmjit Sidhu

450 Clark Drive,

Mt. Olive, NJ  07828

Tel: (973) 448-1901

Fax: (973) 448-1905

E-mail: kssidhu@astsensors.com



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