202D-M-V3.1
Versions
22
6.2 DC POWER VERSION
The DC power version will operate from an external power source between
9-28VDC and draws no more than 4mA. This enables the instrument to be
powered from AC mains adaptors and eliminates the need to run mains
voltages in the field.
The instrument uses lithium batteries for backup if the DC power is
interrupted.
However, alarms and/or pulse outputs are not supported if the DC power
is interrupted.
Open collector outputs are also provided for high and low flow rate alarms.
If a pulse output is programmed, terminals 6 and 5 will act as a pulse out.
The output can sink up to 200mA and can be used to power external relays,
lights or audible alarms. The outputs are internally protected against voltage
spikes caused by relays and coils.
Both outputs are separately isolated via opto-isolators.
The switching points can be programmed during the setup mode and the low
flow alarm will switch on whenever the flow rate drops below the
programmed flow rate. Similarly, the high alarm switches on whenever the
flow exceeds the high setpoint.
If a scaled pulse output is programmed, a pulse will be output every preset
value of the total. For example, if the total is in litres, then programming 5 will
output one pulse every 5 litres. If an unscaled pulse output is programmed,
output pulses will follow input frequency from a flowmeter.
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