Models ER-420-AC, ER-420-DC & ER-420-LP
Pulse-signal PNP / PNP-LP:
The ER-420 is suitable for use with flowmeters which have a PNP output signal. 3.2V is offered on terminal 11 which has to
be switched by the sensor to terminal 10 (SIGNAL). For a reliable pulse detection, the pulse amplitude has to go above 1.2V.
Signal setting PNP-LP employs a low-pass signal noise filter, which limits the maximum input frequency (see "Details of Setup
Functions" on page 14).
For a signal detection level of 50% of the supply voltage, see "Terminal 05-06; scaled pulse output R1:" on page 24.
Active signals 8.1V to 12V and 24V
If a sensor gives an active signal, see "Details of Setup Functions" on page 14. The detection levels are 50% of the selected
supply voltage; approximately 4V (ACT_8.1) or 6V (ACT_12) or 12V (ACT_24).
Page 26 March 2013
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