User manual

UNIVERSAL SENSOR SWITCHING MODULE
Instruction manual Page 12
Released 09/2006 Rights reserved for change in technical data! HYGROSENS INSTRUMENTS GmbH Postfach 1054 D-79839 Löffingen Tel: [phone] Fax: [phone]
6.4 Analog input
6.4.1 Circuit diagram
6.4.2 Functional description
The analog input is to be adapted over a pin contact strip for various types of sensors
and industrial probes.
In order to also use resistive sensors as probes, there is possibility of applying the
reference voltage to the sensor through a configurable preset resistor, which works as
a voltage divider.
The signal is first pre-amplified and then evaluated with a comparator. In each case,
the switching point and hysteresis can be adjusted through a potentiometer.
The switching polarity can be selected by the jumper connections at the output of two
series connected inverters. The signal triggers the internal Timer, which in turn
switches on the relay at the output stage. The switching status of output is indicated
over the LED.