Chemie Und Filter Gmbh Verfahrenstechnik Kg

Prominent Dosiertechnik Gmbh

Hermann Berger

Franz Ernst

The upwardly extending outlet of a pump contains a non-floating permanent magnet which tends to assume a lower end position but is propelled upwardly in response to admission of a metered quantity of liquid into the outlet to initiate the emission of a signal by a sensor. The emission of such signal persists as long as the actuator remains above its lower end position. The sensor is connected with the resetting input of a counter by way of an OR circuit. The n-th output of the counter transmits a signal to an alarm signal generating circuit in response to transmission of a certain number of consective timing pulses to its counting input prior to transmission of a signal to the resetting input. The timing pulses are transmitted by a generator which also transmits pulses to the pump to thus determine the frequency of admission of liquid into the outlet. A rectangular wave oscillator receives signals from the sensor and transmits a series of signals to the OR circuit with a delay which equals or approximates the length of the interval between two consecutive timing pulses. The oscillator starts to transmit signals to the OR circuit only if the signal which is emitted by the sensor persists during the aforementioned delay. This ensures that no alarm signal is generated if the viscosity of pumped liquid is so high that the actuator is incapable of returning to its lower end position during the interval between successive admissions of liquid into the outlet.

Apparatus for monitoring the flow of fluid from a metering pump

An apparatus for regulating a parameter by admission of an additive into a medium comprises a control pulse generator which is dependent on the extent of deviation from the norm, and a regulating element which effects the admission of additive during the interval of generation of a control signal. The control signal generator comprises a first timing pulse generator with a constant frequency and a first counter which receives the first timing pulses from the first timing pulse generator and transmits a first counter overflow signal after receiving a predetermined number of first timing pulses. The control signal generator further comprises a second timing pulse generator whose frequency increases with decreasing deviation form the norm and which transmits second timing pulses to a second counter which transmits a second counter overflow signal after receiving a predetermined number of second timing pulses. Still further, the control signal generator comprises a circuit which interlinks the first and second counter overflow signals in such a way that the first counter determines the duration of the periods and the second counter determines the width of the control signals.

Apparatus for regulating a parameter by admitting an additive into a

A switching circuit with a time-delay device comprises a pulse generator, and a counter which receives pulses therefrom. The overflow output of the counter transmits a counter signal after receiving a predetermined number of pulses. The counter is provided with a holding circuit for maintaining the counter signal up to the time of resetting and renewed start of the counting operation. The resetting input of the counter receives a signal either by way of an inverter or directly. The overflow output of the counter is connected with the output of the time delay device, either directly to obtain a delayed start or by way of an inverter to obtain a delayed termination.

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Heidelberg, Germany

Hermann Berger