Models ER-420-AC, ER-420-DC & ER-420-LP
5 – FLOWMETER
SIGNAL
51
The ER-420 is able to handle several types of input signal. The type of flowmeter pickup / signal is
selected with SETUP 51.
OTE:N The selections "active pulse" offer a detection level of 50% of the supply voltage. Read
also par. 4.4.2.2. and 4.4.3.2. Flowmeter input terminal 09-11.
Type of Signal Explanation Resistance Freq. / MV Remark
NPN NPN input 100 K pull-up 6 kHz (open collector)
NPN - LP NPN input with low pass filter 100 K pull-up 2.2 kHz (open collector) less
sensitive
REED Reed switch input 1 M pull-up 1.2 kHz —
REED - LP Reed switch input with low pass
filter
1 M pull-up 120 Hz Less sensitive
PNP PNP input 100 K pull-down 6 kHz —
PNP - LP PNP input with low pass filter 100 K pull-down 700 kHz Less sensitive
ACT_8.1 Active pulse input 8.1V DC 3 K9 10 kHz External power required
ACT_12 Active pulse input 12V DC 4 K 10 KHz External power required
ACT_24 Active pulse input 24V DC 3 K 10 KHz External power required
Page 16 March 2013
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