Product category:
Hazardous area interfaces, Enclosures
News Release from: R Stahl | Subject: Stahl 9411/21
Edited by the Processingtalk Editorial
Team on 05 February 2008
Field device coupler Exi units on an Exe
fieldbus
Connect intrinsically safe Foundation Fieldbus H1 or Profibus PA devices to up to four spurs, enabling a quick and reliable link-up to a non-intrinsically safe Exe fieldbus trunk
The new R Stahl 9411/21 field device coupler connects Exi units to an Exe fieldbus trunk, and expands the Stahl range of ISbus components The units allow users to connect intrinsically safe Foundation Fieldbus H1 or Profibus PA devices to up to four spurs, enabling a quick and reliable link-up to a non-intrinsically safe Exe fieldbus trunk
This article was originally published on Processingtalk on 29 Apr 2003 at 8.00am (UK)
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Each spur is powered with 40mA, which is sufficient for one field device as well as an optional hand-held operator panel.
The couplers feature an integrated power management which minimises starting and fault currents.
The intrinsically safe spurs comply with FISCO specifications (IEC 60079-27).
A short circuit limiter (spur protection) and galvanic isolation from the trunk (1.5 kV AC test voltage according to EN 50020) prevent feedback effects on the trunk.
Additionally, the couplers feature a switchable terminating resistor.
9411/21 units are available in different versions which are either suitable for DIN rail mounting or come with a fibre-glass reinforced or stainless steel housing.
All models are equipped with either screw or cage clamp terminals.
Besides the new 9411/21 types, R Stahl continues to supply 9411/11 couplers for Exd or Exm field devices.
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