Ultrasonic air-in-line detector self-test technique

Details Ultrasonic air-in-line detector self-test technique Ultrasonic air-in-line detector self-test technique

1989-09-05

1991-10-01

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340573, 340621, 73598, 12866001, 128912, 128DIG6, 128DIG13, G08B 2900, A61B 800

Patent

active

050537474

ABSTRACT:
An ultrasonic air-in-line detection system for use in detecting air bubbles in the fluid line of a disposable cassette mounted on a main pump unit is disclosed in which a self-test procedure is periodically used to ensure that any faults in the ultrasonic air-in-line detector which do not fail safe are automatically detected. After a pumping cycle is completed, if the ultrasonic air-in-line detector indicates that there is fluid in the fluid line at the location of the ultrasonic sensor, the operating frequency of the transmitting ultrasonic transducer is changed to a non-resonant frequency for the self-test procedure. If the ultrasonic air-in-line detector still produces a signal indicating that there is fluid in the line, this indicates that there is a failure in the ultrasonic detector and a fault is indicated and the system is shut down.

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