Pressure sensor monitors filter cleanliness
An
American Sensor Technologies product story
Edited by the Engineeringtalk editorial team
Sep 27, 2007
The Model 5000 wet/wet differential pressure sensor can detect the difference between the upstream pressure and the downstream pressure to notify the system when the filter is clogged.
American Sensor Technologies has released 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 7bar pump using a filter to purify water for drinking, if the pressure in the downstream side of the system drops to 5.5bar, the filter should be changed.
With a 24V DC supply powering the Model 5000 wet/wet different pressure sensor and a selected 4-20mA output signal, the sensor can be calibrated with a 7bar line pressure and a 1.4bar 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, the output signal will increase.
Once the downstream pressure decreases to 5.5bar, the sensor's output signal will reach the full scale of 20mA.
For filtration applications, the upstream side is positioned before the filter.
The upstream pressure drives the media through the filter.
A line is installed in the pressure sensor before the filter and connected to the high side of the sensor.
The filter removes contaminants from the media as it flows through and enters the downstream side of the system.
Next, the downstream pressure or effluent pressure leads the filtered media through the system.
The downsteam side is located after the filter.
A line is installed on the low side of the pressure sensor to monitor the differential.
When the filter is free of contaminants, the system will measure 0bar in 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.
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 ratings for system safety in the most extreme conditions.
Featuring AST's 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.
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