Product category:
Machine Safety Monitoring and Control
News Release from: R. Stahl | Subject: IS isolator series
Edited by the Engineeringtalk Editorial
Team on 01 May 2003
Isolators provide new levels of safety
The IS isolator series is a novel and future-leading series of modules for intrinsically safe circuits.
The IS isolator series is a novel and future-leading series of modules for intrinsically safe circuits The series consists of IS pac modules, together with two mounting options, IS pac bus and IS pac carrier, to form a solution for every installation
This article was originally published on Engineeringtalk on 17 Oct 2005 at 8.00am (UK)
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Each galvanically isolated, compact 17.6 mm module has two input channels; all standard analogue and digital signals are accommodated.
Display and control elements, such as DIP switches, are on the front side with sufficient space for individual labelling.
A new feature of the IS pac are the removable terminals that allow modules to be exchanged while the system is in operation.
Further reading
Safety controllers handle dusty environments
R Stahl has optimised its successful type 8040 control units that are designed for use in areas where combustible dusts are a hazard.
Isolator system approved for offshore applications
The IS Pac isolator system has been approved by Det Norske Veritas for installation on ships and offshore platforms.
The isolators have integrated line error messaging systems that can be set up on an individual channel basis, or a collective messaging system can be implemented with the pac bus or pac carrier.
There are three ways the modules can be mounted in the control cabinet.
First, they can simply be snapped onto a DIN rail and wired individually for use.
For more mounting sophistication, Stahl provides two options.
The first is the IS pac bus, which consists of small plastic connectors which fit inside the DIN rail.
Any number of pac bus connectors can be assembled until the desired length is attained.
The pac modules then plug into the pac bus using the customary tilt-on procedure.
The advantage of the pac bus is that all the IS pac modules can be powered from a single input module that is mounted anywhere on the bus (a second input module can be added for redundancy) and line errors and power supply failures are relayed over floating contacts as collective messages.
A second mounting option provided by Stahl is the IS pac carrier.
With either 8 or 16 slots, the pac carrier provides the opportunity to house the IS pac modules and connect them to a control system via fieldbus modules or a Hart multiplexer.
The pac carrier has, as standard features, a redundant and safety fuse-protected power supply as well as error messaging regarding the status of power interruptions and line errors.
It can snap onto a DIN rail or it can be screwed directly to a mounting plate.
The isolator series modules and mounting options are approved in accordance with ATEX and meet international requirements.
The series is designed for application in Zone 2, respectively Division 2, as well as for use in combustible dust-Ex circuits.
All units are vibration and shock tested, and operate in ambient temperatures ranging from -20 to +70C.
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