Safety Barriers
Description Safety barriers limit the energy fed to an intrinsically safe circuit so that neither sparks nor thermal effects (hot surfaces) can cause an explosion. CEAG safety barriers can be used for all kinds of instrumentation applications. • Digital inputs • Digital outputs • Analog inputs • Analog outputs • Temperature sensors • Pressure transmitters etc.
■ Plug in barrier to be installed on a backplane ■ Backplane snaps on standard 35 mm DIN rail ■ Optional replaceable fuses ■ LEDs shows barrier status ■ Cage clamp connections need no screws ■ Easy installation ■ General purpose and customized backplanes for easy installation ■ Power supply modules to stabilize barrier voltages ■ Large tagging areas for easy circuit identification ■ Mounts horizontally or vertically ■ International approvals
Safety or zener barriers generally have to be connected to equipotential earth. Each barrier connects to this high intergrity ground. The new plug type barrier has a back plane for 10 modules with a single connection to equipotential earth. By plugging the barriers into the back plane, each of them will automatically be earthed. The back plane can also be fitted with a power supply which stabilizes the mains voltage. It is particularly suitable for supply barriers the auxiliary power connection of which is also fed to the back plane via the copper ducts of the PCB. The new safety barriers are fitted with replaceable upstream fuses. Should the polarity be confused or the operating voltage be inadmissibly high, the upstream fuse is there to protect the internal fuse and thus the valuable barrier from being destroyed. The upstream fuse may be replaced during operation. Supply barriers are fitted with an LED which indicates the proper state of the barrier. When installing the barrier, care has to be taken that the polarity of the chosen barrier matches the circuit. The rated voltage must not be exceeded in operation, since that would result in measuring faults. Account has to be taken of the voltage drop over the end to end resistor of the barrier. A correct transmission of voltage signals can only be achieved with purely ohmic end to end resistors. For safety reasons, the maximum values for current, voltage, inductance and capacitance of the barrier have to be checked to match the data of the connected intrinsically safe circuit.
CEAG Sicherheitstechnik GmbH
184
Safety Barriers
Product features Simple wiring
Simple mounting
• save wiring through backplane technology • the PCB connects all barriers to equipotential earth • a power supply module can feed supply barriers via the printed circuit board • 20-30 V DC stabilized to 24 V DC • the stabilized voltage simplifies the use of supply barriers with otherwise fluctuating power lines
• plug-in barriers • cage clamp wiring • replaceable fuses • large tagging area • dual ground
Terminology
Safety barrier
Operating data VN Rated maximum voltage < 2 µA for V < VN Rmax. End to end resistance Si Internal fuse Technical data: Leakage current at VN Temperature drift Operating temperature Storage temperature range Relative humidity Width Weigth Explosion protection: Approval
Safety parameters (in intrinsically safe ciruits) Voc Isc Ca La
Maximum open circuit voltage Maximum short circuit current Maximum permissible external capacitance Maximum permissible external inductance
6
< 2 mA ≤ -250 x 10 - 6 / K -40 °C ... +60 °C -40 °C ... +80 °C < 75 % (annual average) < 95 % (30 d/a) no condensation see dimensions page 193 approx. 70 g
TÜV 97 ATEX 1167 X
Ordering details
Single barrier socket
Description
Type
Order No.
Standard socket (backplane) for 1 barrier Standard socket (backplane) for 2 barriers Standard socket (backplane) for 10 barriers Supply backplane for 8 barriers replaceable fuse 63 mA replaceable fuse 100 mA replaceable fuse 125 mA replaceable fuse 160 mA replaceable fuse 250 mA
SB- 9101 SB- 9102 SB- 9100 SB- 9200 SB- 9201 SB- 9202 SB- 9203 SB- 9204 SB- 9205
GHG 110 0000 W9101 GHG 110 0000 W9102 GHG 110 0000 W9100 upon enquiry GHG 110 0000 W9201 GHG 110 0000 W9202 GHG 110 0000 W9203 GHG 110 0000 W9204 GHG 110 0000 W9205
Note 10 fold backplane segment
Barriers will be supplied without sockets. Please order socket separately. All barriers can be ordered using the type number or the full order no. GHG….
CEAG Sicherheitstechnik GmbH
185
Safety Barriers
Safety barriers Type
DC barrier
1
23
21
13
11
PA
positive
2
23
21
13
11
VN (V)
Rmax (Ω)
Fuse (mA)
VOC (V)
ISC (mA)
Drawing No.
LED
Order No.
SB-0728
24
340
50
28
93
1
X
GHG 111 9140 W0728
SB-1728
-24
340
50
28
93
2
X
GHG 111 9040 W0728
SB-1240
24
205
50
28
150*
1
X
GHG 111 9140 W2410
SB-1230
24
115
50
27.4
277*
1
X
GHG 111 9140 W2420
SB-0722
18
185
50
22
150
1
GHG 111 9140 W0722
SB-0715
12
155
100
15
150
1
GHG 111 9140 W0715
SB-1250
12
53
100
15
387
1
GHG 111 9140 W1211
SB-0758
6
32
100
7.6
500
1
GHG 111 9140 W0758
SB-0779
24/24
340/340
50/50
28/28
93/93
3
SB-1202
23/17
340/435
50/50
26/20
87/51
3
GHG 115 9140 W0796
SB-0767
12/12
155/155
100/100
15/15
150/150
3
GHG 115 9140 W0767
SB-2250
12/12
53/53
100/100
15/15
387/387
3
SB-1350
10/10
83/495
100/100
11.66/11.66
174/25
3
SB-1351
10/10
495/495
50/50
11.66/11.66
25/25
3
GHG 115 9140 W1351
SB-0764
10/10
1075/1075
50/50
12/12
12/12
3
GHG 115 9140 W0764
SB-1301
+6/-6
74
100/100
17.2
414
4
GHG 113 9140 W1202
PA
negative DC double
3
DC floating
4
X
GHG 115 9140 W0779
GHG 115 9140 W1250 X
GHG 115 9140 W1350
23
21
SB-1302
+9/-9
1145
50/50
25.2
25
4
GHG 113 9140 W1804
13
11
SB-1303
+12/-12
154
50/50
29.4
248
4
GHG 113 9140 W2405
SB-2427
24/24
268/13.5+0.9 V
50/50
26.6
120
5
X
GHG 114 9440 W2427
SB-1787
24/24
340/30+0.9 V
50/50
28
93
5
X
GHG 115 9440 W1787
SB-0707
24/24
280/30+0.9 V
50/50
28
171*
5
X
GHG 115 9440 W0707
PA
double with return
5
23
21
13
11
PA
Channel 2 (11-13)
* only group IB
Channel 1 (21-23)
Note Barriers will be supplied without sockets. Please order socket separately (Page 185). All barriers can be ordered using the type number or the full order no. GHG….
CEAG Sicherheitstechnik GmbH
186
Safety Barriers
Safety barriers
double return
6
23
21
13
11
Type
VN (V)
Rmax (Ω)
SB-0786
24/24
Fuse (mA)
30 Ω + 1.2 V
VOC (V)
ISC (mA)
Drawing No.
LED
Order No.
50/50
28/28
0/0
6
GHG 115 9440 W0786
30 Ω + 1.2 V
PA
7
23
21
13
11
SB-1502
12
30 Ω + 1.2 V
50
16.8
0
7
GHG 111 9440 W1201
SB-1602
12
59
100
16.8
390
8
GHG 111 9240 W0906
SB-0710
6
85
50
10
200
8
GHG 111 9240 W0710
SB-1604
6
195
100
8.8
55
8
GHG 111 9240 W0406
PA
AC standard
8
23
21
13
11
6
PA
SB-1701
AC double
9
23 13
21 11
10/10
185/185
50/50
12/12
80/80
9
GHG 115 9240 W0766
SB-0761
6/6
145/145
100/100
9/9
100/100
9
GHG 115 9240 W0761
SB-0201
1.8/1.8
40/40
150/150
5.3/5.3
178/178
9
GHG 113 9240 W0201
SB-0772
18/18
340/340
50/50
22/22
73/73
10
GHG 115 9240 W0772
SB-0765
12/12
135/135
50/50
15/15
150/150
10
GHG 115 9240 W0765
SB-0760
6/6
85/85
50/50
10/10
200/200
10
GHG 115 9240 W0760
PA
universal
10
23
21
13
11
PA
Channel 2 (11-13) Channel 1 (21-23)
Note Barriers will be supplied without sockets. Please order socket separately (Page 185). All barriers can be ordered using the type number or the full order no. GHG….
CEAG Sicherheitstechnik GmbH
187
Safety Barrier Applications
Digital input Floating circuit - 1 channel • Power supply voltage: 24 V DC • End-to-end resistance 282 Ω +0.9 V • Short circuit proof • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G
Hazardous Area
Safe Area 23
21
+24 V
13
11
DI
PA
SB-2427 or SB-1787
Analog input (4 - 20 mA transmitters) Floating circuit - safety barrier circuit • Lowest possible barrier voltage drop: 6.6 V maximum (at 20 mA) • Power supply voltage: 24 V DC • No restrictions for programming SMART transmitters • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G
Hazardous Area
+
Safe Area
23
21
13
11
+24 V
-
AI (Load)
PA
SB-2427 or SB-1787
-
CEAG Sicherheitstechnik GmbH
188
Safety Barrier Applications
Digital output (solenoid valves, LEDs or audible alarms) Grounded circuit - 1 channel • Power supply voltage: to 24 V DC • End-to-end resistance: 340 Ω • Short circuit • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G Grounded circuit - 1 channel - groups C-G • Low resistance barrier • Power supply voltage: to 26 V DC • End-to-end resistance: 205 Ω • Smallest IS barrier available • IS connections for: Zone 1, Group IIB Class I, II, III, Div. 1, Gr. C-G
6 Hazardous Area +
Safe Area 23 +
+ 21
13 -
- 11
-
+24 V DC
-
PA
SB-0728 or SB-1240
Grounded circuit - 2 channel • Power supply voltage: to 26 V DC • End-to-end resistance 340 Ω/channel • Short cirucit proof • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G • Lowest cost solution
Hazardous Area +
Safe Area 23
21
13
11
+24 V DC
PA
+
-
SB-0779
0V
CEAG Sicherheitstechnik GmbH
189
Safety Barrier Applications
Analog output (4 - 20 mA transducers) Grounded circuit - 1 channel • Barrier end-to-end resistance: 155 Ω • Allows the connections of transducers with maximum 445 Ω input impedance • Short circuit proof • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G
Hazardous Area 4 - 20 mA
I
+
P
-
Safe Area 23 +
4 - 20 mA
+
13 -
21
+
11
-
-
PA
SB 0715 or SB 0728
Grounded circuit - 2 channels • Barrier end-to-end resistance: 145 Ω • Allows the connections of transducers with maximum 445 Ω input impedance • Short circuit proof • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G • Lowest cost solution
Hazardous Area
I
P
Safe Area
+
23 ~
~ 21
Ch 1
-
13 ~
~ 11
Ch 2
PA
I
+
P
SB-0201 or SB-0761
-
0V PA
CEAG Sicherheitstechnik GmbH
190
Safety Barrier Applications
Temperature sensors (thermocouples, RTDs) One safety barrier for all applications Thermocouple • Low resistance solution (85 Ω maximum) • Short circuit proof • Lowest cost solution for thermocouple available
Hazardous Area
• Smallest thermocouple IS barrier available • Suited for all thermocouples • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G
Safe Area 23 ~
~ 21
13 ~
~ 11
PA
SB-0201 or SB-0760 2-wire RTD • Lowest resistance solution (40 Ω maximal) • Short circuit proof • Lowest cost solution for RTD available
Hazardous Area
↑↑
6
• Smallest RTD IS barrier available • IS connections for: Zone 1, Group IIC, Class I, II, III, Div. 1, Gr. A-G
Safe Area 23 ~
~ 21
13 ~
~ 11
ϑ
PA
SB-0201 or SB-0761 3-wire RTD • Lowest resistance solution (40 Ω maximum) • Short circuit proof • Lowest temperature coefficient
Hazardous Area
↑↑
• Smallest RTD IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III, Div. 1, Gr. A-G
Safe Area 23 ~
~ 21
13 ~
~ 11
ϑ
PA
SB-0201 or SB-0761 23 ~
~ 21
13 ~
~ 11
PA
SB-0201 or SB-0761 CEAG Sicherheitstechnik GmbH
191
Safety Barrier Applications
Load cells 10 V DC supply - sense • Lowest resistance solution (155 Ω maximum) • Lowest temperature coefficient • Only two barriers required for complete system • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III; Div. 1; Gr. A-G
Hazardous Area
Safe Area 23
21
13
11
+
Sense PA
Bridge
23
21
13
11
Signal
Signal
PA
SB 1350 or SB 0767 SB 1351 0V
12 V DC supply - without sense • Lowest resistance solution (53 Ω maximum) • Lowest temperature coefficient • Only two barriers required for complete system • Smallest IS barrier available • IS connections for: Zone 1, Group IIC Class I, II, III; Div. 1; Gr. A-G
Hazardous Area
Bridge
Safe Area 23
+
+
21
+
13
-
-
11
0V
PA 23
21
13
11
Signal
Signal
PA
SB 1250 or SB 0767 SB 1351
CEAG Sicherheitstechnik GmbH
192
Dimensions
Safety barriers
68.2 mm
9.7 mm
b
a
13 (1x) 125 mm
24.8 (2x)
6
119.5 (SB 9100)
119.5 mm
d
c
125 mm
98.2 mm
70.4 mm
Glossary a Barrier b Socket for 2 barriers c Socket for 10 barriers d Fast-on terminals e Backplane sockets f Fast-on IS terminals g Equipotential earth
e
f
g
g
CEAG Sicherheitstechnik GmbH
193
