Installation & Operation Manual
Terminal 07-08 analog output (SETUP 7)
• An isolated 4…20 mA signal proportional to the flow rate is available for the ER-420-DC and ER-420-AC.
• When the output is disabled, a 3.5mA signal will be generated on these terminals.
• Maximum driving capacity is 1000 Ohm @ 30V DC.
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 29 March 2013
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