Robust emergency-pull wire and belt alignment switches for Ex zones.
The “Extreme” versions of the new steute ZS 92/ZS 92 SR emergency pull wire and belt alignment switches have already been tried and tested in practice. At the SPS 2019, steute will now be showing for the first time Ex versions of these two switching devices, both developed especially for adverse environments. Design features include very robust die-cast aluminium housings with multiple coatings (passivation, base coat, powder coating), a high protection class (IP 65) and significantly reduced actuation force and actuation travel compared to their predecessors. This makes it easier to actuate the emergency stop function and also means reliable fulfilment of all relevant international standards (for e.g. emergency stop switchgear, emergency pull wire s witches or the safety of continuous conveyor equipment).
The emergency pull wire switches in the Ex ZS 92 S series will be available with ATEX/IECEx approvals for zones 1 (gas Ex) and 21 (dust Ex). The belt alignment switches in the Ex ZS 92 SR series will be approved for zone 21 (dust Ex).
Both series have very long lifetimes, even in adverse ambient conditions, and are extremely versatile, for example featuring many different mounting options. These new Ex switches are available in many different configurations for both the actuation lever and the release lever. This means that they can be installed in more or less any conceivable operational position, including for the first time at the back of a machine or belt.
Simple adjustment of the actuation point in 5o steps (between 5o and 35o for two switching inserts) further increases the versatility of the Ex ZS 92 SR in practical applications. The mounting dimensions are compatible not only with its predecessor, the Ex ZS 90 series, but also with other belt alignment and emergency pull wire switches, making it easy to retrofit the new switches on existing conveyors and machines.
The Ex ZS 92 S can be used in temperatures from -10 to +55oC in conjunction with maximum wire lengths of 2 x 100 m. The position of the Ex ZS 92 SR belt alignment lever can be adjusted in 12o steps to suit individual requirements.
With these two series, steute has once again expanded its range of robust “Extreme” switchgear for explosive zones. Typical applications for these devices include international mining, as well as the production of chemicals and construction materials.
