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The Series 700 submersible pressure transducer is suspended approximately 10 inches above the bottom of the wet well via a self-supporting cable. It can hang freely or be suspended in a PVC instrumentation wet well. Alternately, the transducer may be fitted with a ½" Male NPT conduit fitting and attached to rigid conduit.
The sensing element features a four active arm Wheatstone Bridge strain gage diffused directly onto a silicon diaphragm. Protected by a porous screen, this sensor assembly is housed in a rugged 316 stainless steel case with the barrier diaphragm in direct contact with the liquid media. Ported holes in the side of the case nearest the pressure sensor ensure clog-free reliable operation.
Optional pressure inputs and electrical output connections are available as are a variety of analog signals with current loop (4-20 mA) and voltage (0-5 VDC) output being the most common. Excitation voltage may range from 9 to 30 VDC. As the signal is proportional to the liquid column above it, lift station operators are provided with a continuous output that monitors wastewater levels. This facilitates the implementation of anticipatory control processes that can be related to alarm and other instrumentation as well as pump control mechanisms.
The factory attached self-supporting polyurethane jacketed cable has a pull strength of 200 pounds with integral Kevlar tension members to prevent cable stretching. The cable also contains an integral vent tube referenced to local barometric pressure to eliminate inaccuracies due to varying atmospheric conditions.
At the point of cable termination in the controller panel, a field replaceable Series 810 vent filter is connected to the vent tube. Designed specifically for those high humidity environments where water vapor may condense in the vent tube, this unit protects sensitive electronic components from mildew, corrosion, rust and other forms of deterioration while at the same time preventing the formation of a liquid column on the back of the sensor that could cause erroneous readings.
 return to KPSI Level and Pressure Transducer Application Notes
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