With the Ex 99, the steute business unit "˜Extreme' will be presenting a new series of position switches developed especially for "˜Extreme' applications and conforming to DIN EN 50041 dimensions.
"˜Extreme' conditions include use in explosive environments. These new switching devices have therefore been tested and approved in accordance with ATEX and IECEx for use in gas Ex zones 1 and 2, as well as dust Ex zones 21 and 22.
A further "˜Extreme' criterion is suitability for low temperatures. The Ex 99 series can be used in temperatures down to -60degC, making high demands on design, especially housing construction and sealings.
The housings in the new position switches are therefore made out of high-quality fibreglass-reinforced plastic. This material guarantees that even after an impact test at -60degC the high protection class of the switchgear (IP 66) is maintained.
A further aspect to which the designers have dedicated a great deal of attention is the sealing. The sealing of the housing cover is completely vulcanised, while the sealing of the plunger features a redundant sealing system, comprising an external sealing cuff able to withstand low temperatures and an internal Teflon sealing ring.
As is usual with steute position switches, a wide range of actuators is available - for example plungers, roller plungers, roller levers, parallel levers, turning levers, adjustable turning levers and push buttons. Regarding switching inserts, users can choose between different variants with slow-action or snap-action. A function for safety-related applications is a further option.
The extended (low) temperature range of this new series of Ex norm switches also increases its field of application, e.g. into the oil & gas industry (onshore and offshore) or shipping technology (ships travelling the Arctic). The standard dimensions of the new "˜Extreme' switchgear series facilitate integration in a surrounding construction.
More information about the Ex 99 position switches can be found at www.4top.co.uk.
fortop Automation & Energy Control UK Ltd
Malvern Hills Science Park
Geraldine Road
WR14 3SZ
UNITED KINGDOM
+44 (0)1684 585148