SCHURTER Electronics Metal Line switch range is more than just mechanical switches. The global electronic components manufacturer offer switches to operate in the harshest of environments. To achieve this, the business utilise different technology.
The PSE EX family is certified according to ATEX and IECEx regulations. The area of application is consistent with that of the device group II (other areas than mining). The Piezo Switch is used in hazardous environments with ATEX / IECEx certification due to the PSE EX certification. The benefit of using Piezo technology is no moving parts which allows for a fully sealed switch, ideally placed to deal with the rigors of the toughest industries. The PSE EX 16 family has been extended and enhanced to include the PSE EX 19 and PSE EX 22 mounting diameter.
The PSE EX family is approved for use in potentially explosive atmospheres containing air and gases. Further application areas also include industrial sectors such as mills, where solids are found in smallest form as dust which may be prone to self-ignition.
Flammable substances such as gases, vapors or mist which are released into the environment, e.g. while in production, during transportation or storage, may ignite and pose serious consequences for people and property. The same is true for dust, which may develop in conjunction with air to an explosive atmosphere.
To ensure security in these areas, the Device Directives 94/9/EC was developed for products and protection systems. The purpose of the guidelines is the protection of personnel and devices which are working in such hazardous areas. This is done by eliminating all possible sources of fire and ignitions in the products and systems used in these areas.
The approval marking is Ex II 2 GD (according ATEX regulations), Ex ib IIC T6 … T5 Gb and Ex ib IIIC T85 ° C … T100 ° C Db (according IEC regulations) for gases and dust.
The temperature class was extended from T4 to T5 and T6. Therefore the permissible power dissipation of the PSE EX was limited accordingly so that the Piezo Switch is intrinsically safe according to EN60079-11.
In addition, the flammability group was increased from IIB to IIC, respectively IIIC (gas, dust). This extension will allow the use of the PSE EX in atmosphere with further type of gases, combustible dust, ignitable fibres and flyings.
Typical applications include; oil and gas exploration rigs, petrochemical facilities, environments of transportation and storage of combustible materials, paint mixing devices, painting devices, grain mills, wood processing industry, chemical plants etc.
The PSE EX standard models are available with mounting diameters of 16, 19 and 22 mm with pin connectors and housing colors in red, green or natural aluminum. On request other colours, housing diameters and connection versions are obtainable. The switches for hazardous use have a label with the particulars of the certification and an identification number. Installation instructions are included in the packaging according to the ATEX directives.
Technical data / Approvals:
– PSE EX 24V, 40 mA, PT6 = 0.7 W, PT5 = 0.96 W
– ATEX II 2 G D
– IEC Ex ib IIC T6…T5 Gb
– IEC Ex ib IIIC T85°C…T100°C Db
