36 Input Circuits
HP289
6. Input Circuits
This section covers the connection of flowmeter signals for the Model
214D Series Batch Controllers.
The 214D Series has a regulated power supply output which can be
used to power sensors. A trimpot on the rear of the instrument allows
the voltage to be adjusted in the range of 8-24 Volts and the output can
supply a maximum of 50mA.

6.1 Input Circuit for the 214D Series

The 214D Series has an input conditioning card which will accept
signals from most pulse or frequency producing flowmeters. An 8
position DIP switch on the rear panel enables the input circuit to be
configured for different signal types.
The input will interface directly to:
• Turbine Flowmeters
• Open Collector Outputs
• Reed Switches
• Logic Signals
The following pages give examples of the interconnection to various
signal outputs and a circuit diagram of the input is also provided.