EXAMPLE 2 - SPACE MEASUREMENT
This mode of operation is commonly used when remaining vessel capacity is of more importance to the
installation than the actual material level.
Space
For this example we’ll assume the following:
» the vessel is a 3 ft diameter by 15 ft long cylinder (including the parabolic ends of 1.5 ft each).
» the maximum vessel filling rate is 1 ft per minute (slower at mid level).
» a mA output scaled from 4 mA at Full to 20 mA at Empty is required for PLC operation.
» in the event of a measurement difficulty, failsafe operation is to be activated in 6 seconds.
» if the difficulty doesn’t subside, the mA output must immediately assume 22.00 mA.
» an XCT-8 transducer is mounted in a standpipe so that the face is 18 in. above the vessel top.
» a TS-3 temperature sensor is mounted in the vessel to monitor liquid temperature.
4.50 ft
(P006)
3.00 ft
(P007)
12.00 ft
(P053)
1.5 ft
(P052)
TECHNICAL REFERENCE
PL-508 83
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