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English
Zener barriers provide cost saving Ex-protection for various applications in process automation systems. The amount of energy transferred to the hazardous location is limited to a safe level incapable of igniting the explosive atmosphere.
Z-system zener barriers from Pepperl+Fuchs are directly mounted on a 35 mm DIN-Rail. Through accessories, the required grounding can be done directly on the DIN mounting rail.
· Fast mounting on the DIN-rail
· Grounding directly connected with DIN-rail
· Separation of field loop by removing the fus
Z-system zener barriers are available with high density up to 2 channels / 12,5 mm width. Variants with field replaceable fuses provide a convenient means of disconnecting or open-circuiting the instrument loop without interfering with the wiring, making commissioning and maintenance operations much easier. Zener barriers are very accurate in transmission and are often used for calibratable systems such as weighing applications.
Features:
< 2-channel
< DC version, positive polarity
< Working voltage 26.5 V/6.5 V at 10 µA
< Series resistance max. 327 Ω/64 Ω
< Fuse rating 50 mA
< DIN rail mountable
< Asymmetrical version
Functions:
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.
Asymmetrical Zener Barriers are for optimization of applications which have different voltage levels regarding to ground potential.
Depending on the application, increased or decreased intrinsic safety parameters apply for serial or parallel connection.
For the detailed parameters refer to the Zener Barrier certificate.
Application examples can be found in the system description of the Zener Barriers.
Other Zener Barrier Models:
Z705
Z715
Z722
Z728
Z728.F
Z728.H
Z728.H.F
Z755
Z757
Z764
Z765
Z772
Z778
Z779
Z779.F
Z787
Z787.F
Z787.H
Z787.H.F
Z788
Z788.R
Z789
Z828
Z905
Z928
Z954
Z955
Z960
Z960.F
Z961
Z961.H
Z964
Z965
Z966
Z966.F
Z966.H
Z967
Z040
Z041
Z042
Z710
Z713
Z715.1K
Z715.F
Z728.CL
and so on