Tecfluid FLOMID-MX User Manual
Page 5
5
2.4
Remote partial reset connection
Terminal
11
Anode.
12
Cathode.
This input is for connecting a remote push button to reset the partial volume counter, which is
used principally for starting batching processes. These terminals are configured to be activated by a
potential free normally open push button.
The reset input can be connected to the input of an opto-isolator as shown below. The
minimum current required to activate this input is about 2 mA, which can be obtained by applying a
minimum voltage of 5 Vdc to the input. (+ to terminal 11 and – to terminal 12). To do this the instrument
must be opened at the front, the printed circuits must be withdrawn and the JP1 and JP2 jumpers
must be changed to position 1-2.
The push button contact must be a good quality snap action switch to guarantee correct working at low
voltages and reduce contact bounce to a minimum.
2.5
Connection of digital outputs
The digital outputs are NPN opto-isolated bipolar transistors with the same characteristics as the
pulse output (see part 2.3).
Terminal
4
Collector output 1.
5
Emitter output 1.
6
Collector output 2.
7
Emitter output 2.
In the event of employing inductive loads, such as relays, the use of a free wheeling diode is
necessary and should be connected (see part 2.3).