mru SWG100 BIOEX, User Manual, Page: 90 / 150

MRU GmbH SWG 100 BIO Ex User Manual
Page
90
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150
Connection of the external control via 4-20 mA input signals
The signal inputs built a 4-bit binary number:
I4 – I3 – I2 – I1: 0-11 mA=open=0;
11/12-20 mA=closed=1.
Connection of the external control via one 4-20 mA input signal
The user has the opportunity to control the analyzer with only the first 4-20mA input
(see sketch below). The different commands will be given by the changing of the
current signal. The offset-signal is 4 mA. Every 1 mA step describes a condition of for
the external control. Overall the analyzer can take 16 different statuses. The first
status is by 5 mA (4 mA+1 mA) the second is by 6 mA (4 mA + 2 mA) and so on until
the 20 mA signal is reached.
The connection of the one 4-20 mA signal is a two-wire connection.
- - - -
I
+
I3
I2
I1
+
+ +
-
+
I1