Delphin ProfiMessage, Руководство по оборудованию

Страница: 83 / 322

Profi Message
Connection
Indicate here how the sensor has been connected (the diagram displays the selec-
ted wiring):
2 Wire : The sensor is connected with only two wires. This is recommended only
for very short lines and high impedance sensors otherwise the resulting voltage
drop across the circuits can lead to measurement errors. Alternatively, a sensor
can be used with three connections, where measurement takes place without line
compensation.
4 Wire : The recommended connection method for low impedance sensors and/or
longer supply lines. The loss of feed lines does not matter because the device has a
high-ohm input resistance (no voltage drop on the line feed) and the voltage drop
(the measurement value) can be measured directly at the sensor.
4.6.3.3 Sensor type current
Mode
unipolar : Measuring only positive currents.
bipolar : Measuring positive and/or negative currents.
Measuring range
Select a measuring range that is equal to or greater than the current at the load res-
istor to prevent A/D converter overload. The channel receives the status ‘Meas-
83
Delphin Technology AG
Dezember 2015
Profi Message Manual