Fully integrated air purge regulator and level transmitter
Operation based on the control regulating a continuous 1 cfh (cubic foot per hour) flow of compressed air into the tank downpipe
Provides a 1:1 pressure signal to a compatible indicator or external transducer through 1/4 in. airline tubing
All LiquiSeal™ purge controls feature an internal isolation diaphragm
Back pressure created by the continuous purging of the downpipe is applied to this internal diaphragm
Working as a pneumatic transmitter, an equivalent pressure is generated on the gauge side of the diaphragm, which isolates downstream components from contact with the liquid or vapor releases
Generates a constant flow of compressed air to purge a downpipe
All-pneumatic design does not include integral transmitter
Provides 1:1 pressure signal to a compatible indicator or external transducer through 1/4 in. airline tubing
Holds a fixed pressure differential across a precision orifice to ensure constant flow rate of 1 cfh (cubic foot per hour), making it possible to maintain a linear 1:1 response of the sensing system
Back pressure sensed is equivalent to the hydrostatic head pressure due to actual liquid depth
Pneumatic output, or electronic (4 mA to 20 mA) output when paired with KING-GAGE® 860 Series Sensor Control or 868 Series D/P Purge Control
Unaffected by foam or vapor
Safe for hazardous environments
Virtually free from long term drift, hysteresis and temperature sensitivity unlike strain measurements (including load cells) since mechanical deflection of the diaphragm is not directly measured
The compensating pneumatic balance pressure which effectively isolates the sensor is converted to a proportional 4 mAdc to 20 mAdc signal or can be directly output to a suitable gauge
