Release date 2012-05-12 05:49 Date of issue 2012-05-12 071788_eng.xml
Z728
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com
1
Zener Barrier
2
1
7
8
Zone 2
Div. 2
Zone 0, 1, 2
Div. 1, 2
+
-
x3
Connection
Assembly
• 1-channel
• DC version, positive polarity
• Working voltage 26.5 V at 10 µA
• Series resistance max. 327 Ω
•Fuse rating 50mA
•DIN rail mounting
Function
The Zener Barrier prevents the transfer of unacceptably high
energy from the safe area into the hazardous area.
The zener diodes in the Zener Barrier are connected in the
reverse direction. The breakdown voltage of the diodes is not
exceeded in normal operation. If this voltage is exceeded, due
to a fault in the safe area, the diodes start to conduct, causing
the fuse to blow. The Zener Barrier has a positive polarity, i. e.
the anodes of the zener diodes are grounded.
Features
56
78
12
34
Front view
Shield and ground
connection
Tag holder
Terminals
hazardous area
Terminals
safe area
Release date 2012-05-12 05:49 Date of issue 2012-05-12 071788_eng.xml
Technical data Z728
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com
2
General specifications
Type DC version, positive polarity
Electrical specifications
Nominal resistance 300 Ω
Series resistance max. 327 Ω
Fuse rating 50 mA
Hazardous area connection
Connection terminals 1, 2
Safe area connection
Connection terminals 7, 8
Rated voltage 28 V
Supply voltage max. 28 V
Working voltage 26.5 V at 10 µA
Conformity
Protection degree IEC 60529
Ambient conditions
Ambient temperature -20 ... 60 °C (-4 ... 140 °F)
Storage temperature -25 ... 70 °C (-13 ... 158 °F)
Relative humidity max. 75 % , without moisture condensation
Mechanical specifications
Protection degree IP20
Connection self-opening connection terminals,
max. core cross-section 2 x 2.5 mm2
Mass approx. 150 g
Dimensions 12.5 x 115 x 110 mm (0.5 x 4.5 x 4.3 in)
Construction type modular terminal housing , see system description
Mounting on 35 mm DIN mounting rail acc. to DIN EN 60715
Data for application in connection
with Ex-areas
EC-Type Examination Certificate BAS 01 ATEX 7005 , for additional certificates see www.pepperl-fuchs.com
Group, category, type of protection ¬ II (1)GD, I (M1) [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I (-20 °C ≤ Tamb ≤ 60 °C) [circuit(s) in zone 0/1/2]
Voltage Uo 28 V
Current Io 93 mA
Power Po 650 mW
Supply
Maximum safe voltage Um250 V
Series resistance min. 301 Ω
Statement of conformity TÜV 99 ATEX 1484 X , observe statement of conformity
Group, category, type of protection,
temperature class
¬ II 3G Ex nA IIC T4 Gc [device in zone 2]
Directive conformity
Directive 94/9/EC EN 60079-0:2009, EN 60079-11:2007, EN 61241-11:2006 , EN 60079-15:2010
International approvals
FM approval
Control drawing 116-0118
UL approval
Control drawing 116-0139
CSA approval
Control drawing 116-0119
IECEx approval IECEx BAS 09.0142
Approved for [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
General information
Supplementary information EC-Type Examination Certificate, Statement of Conformity, Declaration of Conformity, Attestation of
Conformity and instructions have to be observed where applicable. For information see www.pepperl-
fuchs.com.
