Sealed-Vented-Absolute: How To Know Which Transducer To Specify:
In
summary, the most accurate pressure format to specify for any open-atmosphere
system is vented gage. Whether used
in a lake, river, reservoir, well, or sewage lift station, a vented gage
transducer will negate the fluctuations in atmospheric pressure and ensure the
most precise indication possible of the actual level of the liquid being
measured. If it is not practical
from a maintenance point of view to use a vented gage, then sealed gage is the
next best option. Absolute
transducers are best suited for closed systems that are under pressure or vacuum
and not subject to the effects of atmospheric pressure.
Ship Draft: Seawater-compatible level transmitters for thru-hull mounting in ocean-going vessels.
Roadside Drainage Ditches: Monitor water depth in roadside drainage ditches to warn of imminent
"wash-overs".
Zero Check for Sealed Gage Transducers: A good way to verify the stability of a pressure transducer is to periodically check the output at zero pressure input.
Wet Well Level Transmitter: The liquid level or pressure shall be sensed by a pressure transducer certified by FM, UL, and CSA for installation in a Class I, Division 1, Groups A, B, C, and D, Class II, Division 1, Groups E, F, and G, Class III, Division 1 hazardous location when connected...
Submersible Polyurethane-Jacketed, 4 Wire Cable: Although KPSI installs cable with a water block layer, in all installations, care should be taken to ensure no damage occurs to the cable, as cable damage represents one of the most frequent causes of transducer failure. Water block will prevent moisture intrusion through small cuts in the cable from reaching the transducer.
Tank Level Measurement: Submersible or above ground pressure transducers can be used for tank level measurements. Application specific circumstances dictate which approach is most feasible.
Lift Stations: 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.
Pressure Systems
34 Research Drive
Hampton, VA 23666
800.678.7226
