Applications Operational principle Wiring Optical Level Switches 4a An optical level switch works by emitting a beam of infrared light Liquid Level Control within a prism and measuring the amount of light received. When the Dimensions In fig 4a two optical switches are installed measured fluid reaches the sensor the amount of emitted light received individually in the upper and lower level drops thus triggering the contacts. As the sensor is detecting the state of the tank. between material covering or not covering the prism it can be used to When liquid rises to cover the upper opti- detect the presence or absence of fluid thus preventing damage to cal switch it will trigger the solenoid valve pumps. to close. When the liquid level drops to The compact unit houses the infrared transmitter, the prism, the re- the lower level the optical switch reopens ceiver and the electronics, there is also an external LED indicator to 4b the solenoid to refill the tank. show the condition of the switch. The sensor requires a power supply of between 10-28 Volts Dc. The benefit of the modern optical sensor is Motor protection that there are no moving parts that can retain material and get In Fig 4b an optical switch is installed in clogged up or damaged, simply fit and forget. the lower level of the tank which will cut For ordering information please refer to the part number breakdown on the power to the pump thus protecting it the reverse of this brochure. from damage. TYPE OPT-PC OPT-PS OPT-PC OPT-PS OPT-A2 OPT-A4 Hex Size 19mm 19mm 22mm 22mm 22mm 22mm Body Material Polycarbonate Polysulfone Polycarbonate Polysulfone 304 Grade Stainless Steel 316 Grade Stainless Steel Load Current (Max) 100mA 100mA 100mA 100mA 100mA 100mA Overload Current Protection (Max) 100mA 100mA 100mA 100mA 100mA 100mA Ambient Light (Max) 5000 Lux (visible light) 5000 Lux (visible light) 5000 Lux (visible light) 5000 Lux (visible light) 5000 Lux (visible light) 5000 Lux (visible light) Power Supply 10~28 Volts DC 10~28 Volts DC 10~28 Volts DC 10~28 Volts DC 10~28 Volts DC 10~28 Volts DC Operation Temperature -10C~125C -10C~125C -10C~125C -10C~125C -10C~125C -10C~125C Ambient Temperature -10C~80C -10C~80C -10C~80C -10C~80C -10C~80C -10C~80C Operation Pressure 10Kg/cm2 10Kg/cm2 10Kg/cm2 10Kg/cm2 40Kg/cm2 40Kg/cm2 3/8 G (BSP) 3/8 G (BSP) Connection Thread M12 x1.0 (PC, Polysulfone Only) M12 x1.0 (PC, Polysulfone Only) 3/8 G (BSP) 3/8 G (BSP) 3/8 NPT 3/8 NPT (ST/ST Only) Contact Model NO or NC PNP or NPN output NO or NC PNP or NPN output NO or NC PNP or NPN output NO or NC PNP or NPN output NO or NC PNP or NPN output NO or NC PNP or NPN output Ingress Protection IP68 IP68 IP68 IP68 IP68 IP68 2m (dia 3.8) 3C PVC 22 AWG, 2m (dia 3.8) 3C PVC 22 AWG, 2m (dia 3.8) 3C PVC 22 AWG, 2m (dia 3.8) 3C PVC 22 AWG, 2m (dia 3.8) 3C PVC 22 AWG, 2m (dia 3.8) 3C PVC 22 AWG, Cable Custom made if over 2m Custom made if over 2m Custom made if over 2m Custom made if over 2m Custom made if over 2m Custom made if over 2mOrder Information The full range of Comus products are available to Example: OPT-PC-AR-1 OPT- - - view at any of the websites or contact your nearest Housing Material distributor, a ful list of our distributors can be PC= Polycarbonate (Standard) found on the websites PS= Polysulfone A2= 304 Grade Stainless Steel A4= 316 Grade Stainless Steel Connection Thread AR= G 3/8 (BSP) AU= 3/8 NPT (SS304 & SS316 only) M2= M12 x 1.0 (Polycarbonate & Polysulfone only) Output 1= PNP NC 2= PNP NO 3= NPN NC 4= NPN NO *NO: Wet, In liquid NC: Dry, out of liquid The Comus International group of companies consists of: Comus International Assemtech Europe Limited Comus Belgium BVBA 454 Allwood Road Unit 7, Rice Bridge Industrial Estate Overhaamlaan 40 Clifton Thorpe-le-Soken B-3700 Tongeren New Jersey 07012 Essex Belgium U.S.A England CO16 0HL Tel: (1)973 - 777 - 6900 Tel: +44 (0)1255 862236 Tel: +32 (0)12 390400 Fax:(1)973 - 777 - 8405 Fax:+44 (0)1255 862014 Fax:+32 (0)12 235754 email: info comus-intl.com email: sales assemtech.co.uk email: info comus.be Website: