Magnetic Proximity Sensors
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Magnetic OPERATING PRINCIPLES FOR MAGNETIC SENSORS Magnetic sensors are actuated by the presence of a permanent magnet. Their operating principle is based on the use of reed contacts, whose thin plates are hermetically sealed in a glass bulb with inert gas. The presences of a magnetic field makes the thin plates flex and touch each other causing an electrical contact. The plate’s surface has been treated with a special material particularly suitable for low current or high inductive circuits. Magnetic sensors compared to traditional mechanical switches have the following advantage: • • • • • Contacts are well protected against dust, oxidization and corrosion due to the hermetic glass bulb and inert gas; contacts are activated by means of a magnetic field rather than mechanical parts Special surface treatment of contacts assures long contact life Maintenance free Easy operation Reduced size When using the NO (normally open) type the open reed contact closes as the magnet approaches. NO Magnetic sensors are two wires. When using the NO+NC type both NO (normally open) and NC (normally closed) functions are made available by means of a single glass bulb. NO+NC Magnetic sensors are supplied with three wires, one is in common, one is NO and one is NC TYPICAL REED CONTACT PROTECTIONS The lifespan of a magnetic sensor at low values of voltage and current depends on the mechanical characteristics of the contact while for higher values the operating life depends on the characteristics of the load. In these cases, it is suggested to apply some form of external protection at the sensor output. 44 732 389-3376 Fax 732 542-3553 www.fargocontrols.com

Magnetic Magnetic Proximity Sensors Extremely small dimensions and high operating distances characterize these magnetic sensors in metallic case. To actuate sensor a magnetic is required. Features: • • • • • High operating distance Threaded metallic case Protection degree of IP 67 Hermetically sealed Compliant to the EMC directive Output VA V A NO 10 220 0.5 S3390 S3391 MODEL S3392 S3393 NO+NC 20 150 1 S3398 S3399 S3400 S3401 ∅ 6 mm M8 x1 Dimensions: mm 1" = 25.4 mm 1 mm = .03937” Wiring NO Changeover, NO+NC External Dimensions Operating Distance Switching Frequency Case Protection Degree...

Magnetic Rectangular Magnetic Proximity Sensors To actuate sensor a magnetic is required. Features: • High operating distance • Rectangular case • Protection degree of IP 67 • Hermetically sealed • Compliant to the EMC directive Output VA V A MODEL NO 10 220 0.5 S3394 S3395 NO+NC 20 150 1 S3402 S3403 Height = 8 mm Height = 8 mm Dimensions mm, 1mm = .03937” Wiring NO NO+NC Operating Distance 10 mm Switching Frequency N0 output = 230 Hz max/ NO+NC output = 250 Hz max Case Plastic Protection Degree IP 67 Operating Temperature Output Connection -25 to +100°C (-13 to +212°F) Cable: 2 x 0.14 mm²,...