Applications

• Control and regulation of industrial processes
• Monitoring of plants and switching of electric circuits
• Indication of limit values
• Inductive contacts for safe switching, even in hazardous areas
• Process industry applications: in machine and plant construction, chemical and petrochemical industry, power plants, mining, onshore and offshore and environmental engineering

Models of contacts

	Magnetic snap-action contact model 821 No control unit and no extra power supply required Direct switching up to 230V/1A/30W Up to 4 switch contacts per measuring instruments Not suitable for PLCs		Inductive contact model 831 Can be used in Zone 1/21 (2 GD) hazardous areas Additional control unit required Long service life due to non-contact sensor Low reaction on the display accuracy Up to 3 switch contacts per measuring instrument
	Electronic contact model 830E For direct triggering of a Programmable Logic Controller (PLC) Long service life due to non-contact sensor Low reaction on the display accuracy Up to 3 switch contacts per measuring instrument		Reed-contact model 851 For direct triggering of a Programmable Logic Controller (PLC) Direct switching up to 250V AC/DC -1A, 60VA Single or double change-over contact, model 851.3 or 851.3.3 Combines the electrical values of the 821 and 830E contacts