Product category:
Pressure measurement systems
News Release from: American Sensor Technologies | Subject: DP on filters
Edited by the Processingtalk Editorial
Team on 27 September 2007
Monitoring filter condition using a DP
sensor
American Sensor Technologies offers a wet/wet differential pressure sensor ideal for monitoring the cleanliness of filters, for 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, with a 100psi pump using a filter to purify water for drinking, if the pressure in the downstream side of the system drops to 80psi, the filter should be changed
This article was originally published on Processingtalk on 19 Aug 2004 at 8.00am (UK)
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With a 24VDC supply powering the Model 5000 wet/wet different pressure sensor and a selected 4-20mA output signal, the sensor can be calibrated with a 100psi line pressure and a 20psi differential pressure.
When the water filtration system is operating with a clean filter, the output signal will be 4mA.
As the pressure decreases on the downstream side, the differential pressure, and the output signal, will increase.
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Typically when the downstream pressure decreases to 80psi, the differential is 20psi and the sensor output signal is configured to reach the full scale value of 20mA.
When the filter is free of contaminants, the system will measure 0psi in differential pressure.
As the filter becomes clogged, the pressure on the downstream side reduces, which creates a greater differential between the high and low sides.
By using a differential pressure sensor, the unit will offer a linear output signal based on the differential pressure.
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 over-range and burst protection (5x rated line pressure or 2000psi, whichever is less) ratings for system safety in the most extreme conditions.
Featuring the AST Krystal Bond 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 +85C (-40 to +185F).
Accuracy specifications are < 0.3% BFSL, including non-linearity, hysteresis, and non-repeatability.
For more information about the hydrogen compatible Model 5000 wet/wet differential pressure sensors, go to the American Sensor Technologies website.
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