Pressure pulse masking circuit for a pressure monitor in a dispe

Details Pressure pulse masking circuit for a pressure monitor in a dispe Pressure pulse masking circuit for a pressure monitor in a dispe

1985-05-15

1986-09-23

Rolla, Joseph J.

Dispensing

Automatic control

222 55, 307308, 307491, 73753, B67D 508, B67D 514

Patent

active

046130594

ABSTRACT:
A pressure monitoring system monitors the pressure of hot melt adhesive in a dispenser in an adhesive dispensing system. The dispenser includes a valve and the dispensing system further includes a controller for opening and closing the valve for dispensing pressurized hot melt adhesive from the dispenser. The pressure monitoring system includes a sensor circuit which develops an electrical pressure signal reflective of the pressure of adhesive in the dispenser and a pressure monitor circuit which monitors the electrical pressure signal when the dispenser valve is open. A pulse masking circuit is interposed between the pressure sensor circuit and the pressure monitor circuit to modify the signal produced by the pressure sensor circuit to mask out a transient leading edge, reduced pressure pulse appearing in the electrical pressure signal each time the valve is opened. In this way, the signal received by the pressure monitor circuit is free of such reduced pressure pulses, so that the pressure monitor circuit can properly monitor the actual fluid pressure at the dispenser when the valve is open.

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