Connection diagram for the transmitter (“RS 485”)
3
28
20
21
23
24
25
26
27
1
2
22
+
-
+
-
+
-
+
-
1
2
3
28
20
21
22
23
24
25
26
27
Supply cable
Ground terminal for
protective conductor
Ground terminal for
signal cable shield
Signal cable
ba009y32
Fuse
• Power supply 20...55 V AC / 16...62 V DC:
2.5 A slow-blow / 250 V; 5.2 × 20 mm
• Power supply 85...260 V AC:
1 A slow-blow / 250 V; 5.2 × 20 mm
Ground connection (protective earth)
L1
for AC power supply
L+
for DC power supply
NL–
Alarm output (Relay 1): can be configured
max. 60 V AC / 0.5 A AC; max. 30 V DC / 0.1 A DC
Ground connection (screening of signal cable)
Version with a “RS 485”communication module
Status output (Relay 2): can be configured
max. 60 V AC / 0.5 A AC; max. 30 V DC / 0.1 A DC
RS 485 interface
or *
Auxiliary input
A + / –
3...30 V DC
B – / +
Current output (active): 0/4...20 mA, R
L
< 700 Ω
or *
Pulse/frequency output (active/passive): f
max
= 10 kHz
active: 24 V DC, 25 mA (max. 250 mA/20 ms)
passive: 30 V DC, 250 mA
* Only one version is possible for each, depending on the setting selected in
the function “SYSTEM CONFIG.” (see page 71).
The input and outputs are galvanically isolated from the power supply and
from each other.
Fig. 23
Terminal compartment
Promag 33 (RS 485)
4 Electrical Connection Promag 33
24 Endress+Hauser
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