Installation & Operation Manual
Terminal 07-08 analog output (SETUP 7) :
A passive 4-20 mA signal proportional to the flow rate is available with this option. When a power supply is connected but the
output is disabled, a 3.5 mA signal will be generated.
Maximum driving capacity is 1000 Ohm. This output does loop power the unit as well.
Terminal 09-11; Flowmeter input:
Two basic types of flowmeter signals can be connected to the unit: passive or active pulse.
The screen of the signal wire must be connected to the common ground terminal 9 (unless earthed at the sensor itself).
The maximum input frequency is approximately 10 kHz (depending on the type of signal). The input signal type has to be
selected with the correct SETUP function (see "Details of Setup Functions" on page 14).
Pulse-signal NPN / NPN-LP:
The ER-420 is suitable for use with flowmeters which have a NPN output signal. For reliable pulse detection, the pulse
amplitude has to go below 1.2V. Signal setting NPN-LP employs a low-pass signal noise filter, which limits the maximum input
frequency (see "Details of Setup Functions" on page 14).
Page 25 March 2013
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