Каталог Weidmuller: Electronics - Analogue Signal Conditioning

Intrinsically safe signal conditioners
for hazardous area applications
ACT20X
NAMUR isolating switching amplifier: with relay output
The ACT20X-HDI-SDO-RNO (NC) isolating switching amplifier is a specialized signal
isolating converter for Namur sensor signals or for simple switching signals from the
Ex Zone 0. A single relay, available optionally as NC or NO, provides the output signal
in the safe zone. Single-channel or double-channel versions are also available.
B
Connection diagram: ACT20X HDI-SDO-RNC
Ex label
Channel 1:
Input Signals
NAMUR
+
Mechanical
switch
– R p
R s
R p
14
13
12
11
44
43
42
41
Output Signals
Relay
Relay
Relay
Relay
Channel 2:
N.O. or N.C.
Channel 1:
N.O. or N.C.
ATEX
II 3 G Ex nA nC IIC T4
II (1) G [Ex ia] IIC/IIB/IIA
II (1) D [Ex iaD]
IECEx
Ex nA nC IIC T4 Gc
[Ex ia Ga] IIC/IIB/IIA
[Ex ia Da] IIIC
FM
Installation in CL I DIV2 GP A-D T4
Protects Ex circuits, in compliance with
Cl. I-III ABT 1/2 GP A-G or
Cl. I Zn2 AEx/Ex nA nC [ia] IIC T4.
Channel 2:
NAMUR
+
Mechanical
switch
– R p
R s
R p
24
23
22
Power Supply
Gnd. –
51
Supply +19.2...31.2 V DC
52
Module status
53
N.C.
21
54
Module status
Zone 0, 1, 2, 20, 21, 22 /
Cl. I/II/III, div. 1 gr. A-G
Zone 2 / FM Cl. 1,
div. 2, gr. A-D o safe area
Note
Application: monitoring of fill level with the ACT20X HDI-SDO-RNO
(relay output)
EX Zone
Safe zone
A.C. supply
Control
+24 V DC
+
Power
supply
Fill level is high,
intrinsically safe Namur
or mechanical switch
PS
0 V
-
Other converter
Channel 1 digital input
Channel 1 digital output
Zone 0
Channel 2 digital input
Channel 2 digital output
ACT20X-2HDI-2SDO-RNO
Tank
Fill level is low,
intrinsically safe Namur
or mechanical switch
B.6