Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1990-08-16
1992-01-07
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
222 64, 331 65, 324236, G01F 2318, G01N 2772
Patent
active
050780107
ABSTRACT:
A sensor for sensing the level of adhesive medium in a dispensing device, which sensor comprises; (a) a coil which is adapted to surround a dispensing device for dispensing adhesive medium at an adhesive dispensing station; (b) means for connecting the coil to the input of an oscillator; (c) detector means for detecting the frequency of the output of the coil; (d) conversion means to perform a frequency to voltage conversion on the varying frequency detected at the detector means (c); (e) analogue to digital conversion means to convert the signal from the frequency to voltage conversion means (d) into a form which can be compared with a calibration scale obtained by measuring the signals generated at the output of the coil, when the coil is surrounding a dispensing device containing at least two different known quantities of adhesive medium; and (f) display means for displaying the result of this comparison. The sensor can give information to the machine operator as to when the adhesive is about to run out, or to indicate how many more bonding cycles can be performed before the dispensing device has to be replaced or refilled.
REFERENCES:
patent: 3962919 (1976-06-01), Playfoot et al.
patent: 4165641 (1979-08-01), Pomerantz et al.
patent: 4816759 (1989-03-01), Ames et al.
patent: 4876504 (1989-10-01), Blake et al.
patent: 5001424 (1991-03-01), Kellett et al.
Emhart Inc.
Spencer Spencer T.
Yasich Daniel M.
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