447
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Issue date 19.9.00
Zener barriers - Operating instructions
How to select the correct barrier
7.The follo wing points have to be clarified if spe cial field devi ces
are used.
• If the field device is a 4-20 mA transmitter: What load in
Ohms can be connecte d to t he transmitte r so t hat it ca n at-
tain 20 mA as before?
• If the field device is a current / pressure converter: What
load ca n be conn ected to the controlle r ca rd s o that it ca n
attain 20 mA as before?
• If the field device is a transmitter: How high is the load in
the safe area? (Typically, resistances of up to 250 Ohm are
used in the controller.).
NEW: In the near future, a barrier will be available with a
replaceable back-up fuse.
The introduction of a replaceable back-up fu se ahead of the
integrated fuse provides protection against faults which could
occur during the commissioning of the system. It is always
arranged that the outer fuse will respond before the inner, inn-
accessible fuse. The fuses used are specially intended for use
on barriers.
Z...
Type
Channels
Max.
Series resist-
ance
Uin
at 10 µA
Uin
max
Fuse rating External
fuse
Fuse supplied
by
LITTLEFUSE
Ohm V V mA mA
Z715.F 1 106 13 13.6 100 63 217,063
Z728.F 1327 27 28 80 50 217,05
Z728.H.F 1 250 27 28 80 50 217,05
Z765.F 2106
106
13
13
13.6
13.6
100
100
63
63
217,063
Z779.F 2327
327
27
27
28
28
80
80
50
50
217,05
Z779.H.F 2250
250
27
27
28
28
80
80
50
50
217,05
Z787.F 2 327
36 + 0.9V
27
27
28
28
80
80
50
50
217,05
Z787.H.F 2250
25+ 0.9V
27
27
28
28
80
80
50
50
217,05
Z960.F 2 64
64
6.5
6.5
9.5
9.5
80
80
50
50
217.05
Z961.F 2106
106
6.5
6.5
8.1
8.1
160
160
100
100
217.1
Z966.F 2 166
166
10
10
11.7
11.7
100
100
63
63
217.063
448
Issue date 19.9.00
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Zener barriers - Operating instructions
How to select the correct barrier
Type Nominal data See circuit
diagram No. Circuit diagram
Hazardous area Safe area
connections connections
+ ve - ve a.c. VΩ
Z705
–
Z710
–
Z710.CL
Z805
–
Z810
–
Z810.CL
–
Z905
–
Z910
–
5
5
10
10
10
10
10
50
50
50
1), 2)
3)
1), 2)
3)
1), 2)
1)
2)
3)
4)
5)
6)
7)
Z715
–
Z715.CL
Z715.1K
–
Z815
–
Z815.CL
Z815.1K
–
–
Z915
–
–
Z915.1K
15
15
15
15
15
100
100
100
1k
1k
1), 2)
3)
1), 2)
3)
1), 2)
Z722
Z722.CL
Z728
Z728.CL
–
Z822
Z822.CL
Z828
Z828.CL
–
–
–
–
–
Z928
22
22
28
28
28
150
150
300
300
300
1), 2)
1), 2)
1), 2)
1), 2)
3)
Z755 Z855 – 5 10 4), 5)
– – Z955 510 6)
Z757
–
–
Z857
–
–
–
Z961
Z961.H
7
7
9
9
9
9
10
10
100
100
360
360
4), 5)
6)
6)
Z764 Z864 –12
12 1k
1k 4), 5)
– – Z964 12
12 1k
1k 6)
Z765 Z865 –15
15 100
100 4), 5)
– – Z966 12
12 150
150 6)
– – Z966.H 12
12 75
75 6)
Z772 Z872 –22
22 150
150 4), 5)
+VE Type
18
27
CL
x3
-VE Type
18
27
CL
x3
AC Type
18
27
x3
x3
+VE Type
18
45
27
36
x3
x3
-VE Type
18
45
27
36
x3
x3
AC Type
18
45
27
36
x3
x3
x3
x3
AC Type
All diodes are turned 180 ˚
for the -VE- version.
18
45
27
36
x3
x3
449
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Issue date 19.9.00
Zener barriers - Operating instructions
How to select the correct barrier
see
Note 2 Ex-characteristic s for [EEx ia] IIC Max. end-to-
end resist-
ance
Uin
bei 10 µA
Uin
max
Fuse rating
Uz (V) Rmin (Ω) IK(mA) Pmax(W) Cmax (µF)Lmax (mH) L/R Ratio ΩVVmA
4.94
4.98
9.56
9.94
9.56
9.8
9.8
49
49
49
504
499
195
203
195
0.62
0.61
0.47
0.50
0.47
1800
1800
3
3
3
0.15
0.15
0.95
0.95
0.95
60
60
75
75
75
18.18
18.18
55
55
62 +2V
0.9 (1 µA)
0.9 (1 µA)
6.5
6.5
6.5
4.8
4.7
8.9
9.3
8.9
250
250
100
100
100
14.7
15.0
14.7
14.7
15
98
98
98
980
980
150
153
150
15
15
0.55
0.57
0.55
0.06
0.06
0.75
0.75
0.75
0.75
0.75
1.5
1.5
1.5
150
150
65
65
65
590
590
106
106
113 +2V
1024
1024
13.0
13.0
13.0
13.0
13.0
13.6
14.0
13.6
13.6
14.0
100
100
100
100
100
22
22
28
28
28
147
147
301
301
301
150
150
93
93
93
0.83
0.83
0.65
0.65
0.65
0.26
0.26
0.13
0.13
0.13
1.5
1.5
4.2
4.2
4.2
43
43
55
55
55
166
181 +2V
327
342 +2V
327
19.0
19.0
27.0
27.0
26.0
20.1
20.1
28.0
28.0
27.6
50
50
50
50
50
A1
A2
B
4.94
4.94
4.94
9.8
9.8
4.9
504
504
1008
0.62
0.62
1.24
1800
1800
1800
0.15
0.15
0.037
60
60
23
18.18
18.18
–
0.9 (1µA)
0.9 (1µA)
–
4.8
4.8
–
250
250
–
A1
A2
B
C
4.89
4.89
4.89
9.78
9.8
9.8
4.9
19.6
499
499
998
499
0.61
0.61
1.22
1.22
1800
1800
1800
3
0.15
0.15
0.037
0.15
60
60
23
30
18.18
18.18
–
–
0.9 (1µA)
0.9 (1µA)
–
–
4.7
4.7
–
–
250
250
–
–
A1
A2
B
A1
A2
B
C
A1
A2
B
7.2
7.2
7.2
8.7
8.7
8.7
17.4
8.7
8.7
17.35
9.8
9.8
4.9
98
98
49
196
352.8
352.8
176.4
729
729
1458
89
89
178
89
25
25
50
1.3
1.3
2.6
0.19
0.19
0.39
0.39
0.05
0.05
0.1
14
14
14
5
5
5
0.5
5
5
0.46
0.7
0.7
0.17
4.5
4.5
1.2
4.5
54.5
54.5
14.35
29
29
11
173
173
68
86
589
589
238
15.5
15.5
–
106
106
–
–
380
380
–
6.0
6.0
–
6.5
6.5
–
–
6.5
6.5
–
6.9
6.9
–
8.1
8.1
–
–
8.1
8.1
–
200
200
–
100
100
–
–
50
50
–
A1
A2
B
11.6
11.6
11.6
980
98
490
12
12
24
0.03
0.03
0.06
1.6
1.6
1.6
230
230
60
910
910
350
1033
1033
–
10.0
10.0
–
11.0
11.0
–
50
50
–
A1
A2
B
C
12
12
12
24
980
980
490
1960
12
12
24
12
0.04
0.04
0.08
0.08
1.6
1.6
1.6
0.2
230
230
60
230
910
910
350
460
1033
1033
–
–
10.0
10.0
–
–
11.7
11.7
–
–
50
50
–
–
A1
A2
B
14.7
14.7
14.7
98
98
49
150
150
300
0.55
0.55
1.1
0.75
0.75
0.75
1.5
1.5
0.35
65
65
23
106
106
–
13.0
13.0
–
13.6
13.6
–
100
100
–
A1
A2
B
C
12
12
12
24
147
147
73.5
294
82
82
164
82
0.24
0.24
0.48
0.48
1.6
1.6
1.6
0.2
5.2
5.2
1.
5.2
143
143
53
71
166
166
–
–
10.0
10.0
–
–
11.7
11.7
–
–
50
50
–
–
A1
A2
B
12
12
24
73.5
73.5
36.5
163
163
327
0.49
0.49
0.98
1.5
1.5
0.18
1.34
1.34
0.312
72
72
30
82
82
–
10.0
10.0
–
11.7
11.7
–
100
100
–
A1
A2
B
22
22
22
147
147
73.5
150
150
300
0.83
0.83
1.66
0.26
0.26 1.5
1.5 43
43 166
166
–
19.0
19.0
–
20.1
20.1
–
50
50
–
no approval for IIC
450
Issue date 19.9.00
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Zener barriers - Operating instructions
How to select the correct barrier
Type Nominal data See circuit dia-
gram No.
Circuit diagram
Hazardous area Safe area
connections connections
+ ve - ve a.c. VΩ
Z778
Z779
Z779.H
Z878
Z879
Z879.H
–
–
28
28
28
28
28
28
600
600
300
300
240
240
4), 5)
4), 5)
4), 5)
8)
9)
10)
11)
Z796 Z896 –26.6
20.5 320
415 4), 5)
Z788
+
Z788.H
Z788.R
Z788.R.H
Z888
+
Z888.H
Z888.R
Z888.R.H
–28
10
28
10
28
10
300
50
240
50
240
50
4), 5)
4), 5)
7)
4), 5)
Z786 Z886 28
28 Diode
Diode 8)
Z787
Z787.H
Z887
Z887.H
–28
28
28
28
300
Diode
240
Diode
9)
9)
– – Z960 10
10 50
50 10)
– – Z965 15
15 100
100 10)
– – Z967 17
17 120
120 10)
– – Z972 22
22 300
300 10)
– – Z978 28
28 620
620 10)
All diodes are turned 180 ˚
for the -VE- version.
18
45
27
36
x3
x3
All diodes are turned 180 ˚
for the -VE- version.
18
45
27
36
x3
x3
18
45
27
36
x3
18
45
27
36
451
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Issue date 19.9.00
Zener barriers - Operating instructions
How to select the correct barrier
see
Note 2 Ex-characteristic s for [EEx ia] IIC Max. end-to-
end resist-
ance
Uin
at 10 µA
Uin
max
Fuse rating
Uz (V) Rmin (Ω) IK(mA) Pmax(W) Cmax (µF)Lmax (mH) L/R Ratio ΩVVmA
A1
A2
B
A1
A2
B
A1
A2
B
28
28
28
28
28
28
28
28
–
607
607
303.5
301
301
150.5
235
235
–
46
46
92
93
93
186
119
119
–
0.32
0.32
0.65
0.65
0.65
1.3
0.83
0.83
–
0.13
0.13
0.13
0.13
0.13
0.13
0.13
16
16
4.2
4.2
4.2
2.55
2.55
103
103
40
55
55
42
42
646
646
–
327
327
–
250
250
–
27.0
27.0
–
27.0
27.0
–
27.0
27.0
–
28.0
28.0
–
28.0
28.0
–
28.0
28.0
–
50
50
–
50
50
–
80
80
–
A1
A2
B
26.6
20.5
23.9
314
407
177.25
85
50
135
0.57
0.26
0.81
0.15
0.3
0.15
5
14
1.9
60
132
34
340
437
–
24.0
18.0
–
25.1
19.5
–
50
50
–
A1
A2
A1
A2
B
B
A1
A2
B
28
9.56
28
9.56
28
12.14
28
9.56
28
301
49
235
49
40.54
42.14
235
49
40.54
93
195
119
195
314
288
119
195
314
0.65
0.47
0.83
0.47
1
0.87
0.83
0.47
1
0.13
3.0
0.13
3
0.13
0.13
0.13
3
0.13
4.2
0.95
2.55
0.95
0.27
0.36
2.55
0.95
0.27
55
75
42
75
27.7
25
42
75
27.7
327
64
250
64
–
–
250
64
–
27.0
6.5
27.0
6.5
–
–
27.0
–
–
28.0
9.1
28.0
9.1
–
–
28.0
9.1
–
50
50
80
80
–
–
80
80
–
A1
A2
B
28
28
28 –
–
– –
–
–
0.13
0.13
0.13
–
–
–
–
–
–
36 + 0.9 V
36 + 0.9 V
–
27.0
27.0
–
28.0
28.0
–
50
50
–
A1
A2
B
A1
A2
B
28
28
28
28
28
28
301
–
301
235
–
235
93
93
119
–
119
0.65
–
0.65
0.83
–
0.83
0.13
0.13
0.13
0.13
0.13
0.13
4.2
–
4.2
2.55
2.55
55
–
55
42
42
327
36 + 0.9 V
–
250
25+ 0.9 V
–
27.0
27.0
–
27.0
27.0
–
28.0
28.0
–
28.0
28.0
–
50
50
–
80
80
–
A1
A2
B
C
9.94
9.94
9.94
9.94
49
49
24.5
98
203
203
406
102
0.50
0.50
1.08
0.25
3
3
3
3
0.95
0.95
0.2
3.5
75
75
27
143
64
64
–
–
6.5
6.5
–
–
9.5
9.5
–
–
50
50
–
–
A1
A2
B
C
15
15
15
15
98
98
49
196
153
153
306
77
0.57
0.57
1.15
0.29
0.75
0.75
0.75
0.75
1.5
1.5
0.3
6.0
65
65
20
117
115
115
–
–
13.0
13.0
–
–
14.2
14.2
–
–
50
50
–
–
A1
A2
B
C
16.8
16.8
16.8
16.8
117
117
59
235
143
143
286
71
0.60
0.60
1.20
0.30
0.56
0.56
0.56
0.56
1.6
1.6
0.26
6.8
47
47
21
114
136
136
–
–
15.0
150
–
–
16.2
16.2
–
–
50
50
–
–
A1
A2
B
C
22
22
22
22
301
301
150
602
73
73
146
37
0.40
0.40
0.80
0.20
0.26
0.26
0.26
0.26
6.6
6.6
1.5
23
83
83
33
166
327
327
–
–
19.0
19.0
–
–
20.9
20.9
–
–
50
50
–
–
A1
A2
B
C
28
28
28
28
607
607
304
1215
46
46
92
23
0,32
0,32
0.64
0.16
0.13
0.13
0.13
0.13
16
16
4.2
64
105
105
39
205
646
646
–
–
26.0
26.0
–
–
27.6
27.6
–
–
50
50
–
–
no approval for IIC
no approval for IIC
see Note 1
452
Issue date 19.9.00
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Zener barriers - Operating instructions
How to select the correct barrier
Note:
Zener barriers type Z787H and Z887H have channels with
diode returns.
The Ex terminals for the channels with diode returns should be
regarded as 28 V voltage source s.
The 28 V must be considere d as the theore tical maxim um up
to wh ich a capaci tive lo ad can be ap plied t o the Ex t erminals
due to the leakage curr ent of the diode retur n. This voltage is
only used in calculating the load capacitance.
Remark:
A1, A2 and A3 are separate channels.
B: Two channels in parallel circuit with a ground connection.
C: Two channels in series circuit without a ground return.
Type Nominal data See circuit dia-
gram No.
Circuit diagram
Hazardous area Safe area
connections connections
+ ve - ve a.c. VΩ
– – Z954 11)
Dummy
799 18
45
27
36
see
Note 2 Ex-characteristics for [EEx i a] IIC Max. end-to-
end resist-
ance
Uin
at 10 µA
Uin
max
Fuse rating
Uz (V) Rmin (Ω) IK(mA) Pmax(W) Cmax (µF)Lmax (mH) L/R Ratio ΩVVmA
A1
A2
A3
B
C
4.5
4.5
4.5
9.0
9.0
11.76
11.76
11.76
3.92
17.64
383
383
383
1148
510
0.43
0.43
0.43
1.29
1.15
3000
3000
3000
3.2
3.2
0.25
0.25
0.25
0.028
0.12
85
85
85
19
24
27.27
27.27
27.27
0.9 (1 µA)
0.9 (1 µA)
0.9 (1 µA)
4.9
4.9
4.9
50
50
50