202D-M-V3.1
Versions
24
6.3 RELAY AND 4-20mA OUTPUT VERSION
This version combines features of the DC powered with a 4-20mA output.
The 4-20mA output provides a two-wire retransmission of the flow rate. Both
the 4mA and 20mA points are fully programmable so that the output can span
across the entire operating range or, alternatively, across a small section of the
operating range.
The instrument draws its operating power from the 4-20mA loop and uses
lithium batteries for backup if the 4-20mA loop is interrupted. The
alarm/pulse outputs are not supported if the 4-20mA loop is interrupted.
Specification
Resolution and Linearity: 0.05% of span.
Accuracy: 0.05% of span at 25°C.
0.1% (typ) of span, full temperature range.
Response (4-20mA): 0.5 second.
Loop Power Supply: 9-28 Volts.
Since the 4-20mA output is designed to provide power to the Model 202D, it is
not isolated from the input. Hence, all sensors must be self-powering (such as
reed switches and coils). If external power is required to power the sensor (e.g.
Namur switches, Hall effect sensors or opto-sensors), the power supply
delivering the external power must be isolated from the 4-20mA loop supply.
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