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DEVICES FOR EX ZONES
Safety switches with separate actuators are suitable for sliding, hinged and particularly removable safety guards, which need to be closed to ensure the necessary operational security. They are also suitable for fitting on profile sections and existing equipment.
AZM range solenoid interlocks, operating in combination with control elements of a machine, e.g. fail-safe standstill monitors or fail-safe delay timers, ensure that sliding, hinged and removable guarding devices, such as grids, hoods or doors, cannot be opened until hazardous conditions (e.g. running-down movements) have come to an end.
Along with the mechanically operated limit switches, magnetic reed switches (magnetically operated) have been constantly gaining increased importance. They can be regarded as a complement to the plunger, roller and turret head operated limit switches and as an important addition to electronic proximity switches.
The magnetic safety sensors serve to monitor the position of sliding, hinged and removable safety guards. Sensors without integral evaluation can only be used for safety duties to DIN VDE 0660-209 in combination with a safety guard monitor for protection up to Control Category 4 to EN 954-1.
The fundamental functional characteristic of a key transfer system is that, depending on the operating state of the machine control system, the key is trapped and cannot be withdrawn either. In automatic mode (with the guard locked) in a control element (usually in a key-operated selector switch)
Two Directives basically govern the explosion protection of machinery and plants within the European member states. Directive 94/9/EC of the European Parliament and of the Council of 23 March 1994
. Directive 1999/92/EC of the European Parliament and of the Council of 16 December 1999
Pull-wire emergency stop switches are fitted on machines and plant components, which cannot be protected by guards. Contrary to mushroom head emergency stop pushbuttons, the emergency stop function can be triggered from any point on the wire.
The new generation of safety relay modules SRB EXi combines the approved safety technique with the demands of the explosion protection. The SRB EXi modules are developed on the basics of the ATEX directive 94/9/EG and the European standards EN 60 079 et seq. The intrinsically safe monitoring guards EXi are designed for equipment of the category 2GD. Therewith emergency stop devices and safety door monitorings may be used in gas- and dust-explosive atmosphere.
These safety switches are suitable for hinged safety guards, which need to be closed to ensure the necessary operational security. The variety of requirements to be found in practice can be met by means of the wide range of safety switches for hinged guards.
The command and signaling devices of the Ex-R series are particularly suitable for applications in explosive environments and meet the requirements of the zones 1, 2, 21 & 22. The devices are furthermore suitable for use under rough ambient conditions as well as for operation with gloves because of their large actuating surfaces.
The belt alignment and slack-wire switches are suitable for use on material handling equipment. The belt alignment switches are actuated, when the conveyor belt becomes misaligned. Depending on the plant arrangements, this signal can be used to switch the equipment off or to provide automatic correction of the belt alignment.
The belt alignment and slack-wire switches are suitable for use on material handling equipment. The slack-wire switches monitor the wire rope tension. With correct tension present, the switch is actuated.