Method of transmitting measured temperature and position paramet

Details Method of transmitting measured temperature and position paramet Method of transmitting measured temperature and position paramet

1992-10-26

1993-10-19

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Float

73292, 73290V, 32420721, 340618, 374142, G01F 2300, G01R 3318

Patent

active

052535215

ABSTRACT:
A magnetostrictive liquid level transducer equipped with a number of temperature sensitive resistors is supplied with low level power from a remote station and charges a capacitor to store power for interrogation of the level transducer. The transducer is interrogated periodically for level measurements and the capacitor is recharged between interrogations. During the recharging periods, temperature measurements are made. Thus the level and temperature related data is measured and transmitted alternately. Each measurement results in a pair of pulses having a spacing corresponding to the measured value. The transmission message comprises a plurality of frames or time periods. The first frame is blank and is used for synchronizing the receiving device with the message frames. The subsequent frames have the level and temperature related data interleaved in the message and are easily sorted by the receiving device at the remote station. The data pulses are sent on the power transmission conductors.

REFERENCES:
patent: 4361835 (1982-11-01), Nagy
patent: 4726226 (1988-02-01), Tellerman
patent: 4924700 (1990-05-01), Habart
patent: 5017867 (1991-05-01), Dumais et al.
patent: 5050433 (1991-09-01), Lumetta
patent: 5076100 (1991-12-01), Hunter et al.

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