Application in high pressure or vacuum conditions 95

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Unformatted text preview: ting "around the corner", in crevisses or through holes. • Necessity of flush mounted installation. • Required minimum distance between several adjacent proximity sensors. 9.4 Environmental considerations • Ambient temperature • Effect of dust, dirt, particles, humidity, splashing water, water jets inter alia, see IP protection classes. • Influence of magnetic or electric fields, e.g. in a welding environment. • Influence of external light emissions (peculiarities of ambient lighting). • Area with explosion hazard • Clean room environment • Requirements for hygiene or sterilisation for use with food packaging or in a medical environment. • Application in high pressure or vacuum conditions. 9.5 Safety applications • Application in areas with explosion hazard • Application for the purpose of accident prevention • Application where increased safety measures are required against breakdown © Festo Didactic GmbH & Co. KG • FP 1110 139 9. Selection criteria for proximity sensors 9.6 Options/features of proximity sensors 140 • Design/type with specification of dimensions • Voltage supply (direct current, alternative current) • Type of switch output and type of protective circuits: – Positive switching (PNP output) – Negative switching (NPN output) – Short circuit protection – Reverse polarity protection • Connection:...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

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