Photoelectrics Level Sensors Types VP, Modulated * Modulated infrared sensor for liquid level detection * Built-in amplifier, Ga-As diode * Output: Transistor NPN/PNP, make or break switching * High chemical resistance to most acids and bases * VP01/03/23: Output OFF when sensor in liquid * VP02/04/24: Output ON when sensor in liquid * No electrical or thermal connection between liquid and electrical circuit * LED-indication for output ON * Power supply 10 to 40 VDC Product Description Optical level sensor with modulated, infrared light for the detection of liquids. Fitted with built-in amplifier. Transmitter and receiver are completely selfcontained in solid plastic designed for mounting into container wall. Ordering Key VP01/02 are available in a Polysulfone housing resistant to most acids and bases. VP03/04EM are available in a Polyamide 12 housing resistant to various solvents. VP23/24 are available in a stainless steel housing. VP 2 2 E P M -1 Type Housing Output status Output type PNP output Modulated Connection Type Selection Housing material Connection Ordering no. Transistor NPN Make switching Ordering no. Transistor NPN Break switching Ordering no. Transistor PNP Make switching Ordering no. Transistor PNP Break switching Polysulphone Polyamide 12 Nickel-plated brass Nickel-plated brass Stainless steel Cable Cable Cable Plug Cable VP 02 EM VP 04 EM VP 01 EM VP 03 EM VP 01 EPM VP 03 EPM VP 24 EM VP 23 EM VP VP VP VP VP 02 04 22 22 24 EPM EPM EPM EPM-1 EPM VP 23 EPM Specifications Rated operational voltage Rated operational current Continuous Voltage drop No-load supply current Sensing accuracy Liquid level difference Ambient light Frequency of operating cycles (f) Environment Degree of protection Operating temperature Storage temperature Indication for output status Housing material VP01/02 VP03/04 VP23/24 VP22 10 - 40 VDC 200 mA 1.0 VDC 7 mA Horizontal mounting: 5 mm Vertical mounting: 2.5 mm 0 - 50.000 lux 30 Hz IP 67 -20 to +80C (-4 to +176F) -40 to +100C (-40 to +100F) LED, yellow Tip material VP01/02/22 VP03/04/23/24 Weight VP0x VP2x Connection Cable Plug (-1) Cable for plug (-1) Pressure VP0x VP2x Pipe thread Polysulphone Polyamide 12 90 g 190 g PVC, 2 m M12 x 1 CON.1-... series 10 bar at + 60C 10 bar at + 80C 3/8" PT Polysulphone Polyamide 12 Stainless steel (AISI 304) Nickel-plated brass Specifications are subject to change without notice (02.10.02) 1 VP, modulated Dimensions Mode of Operation The sensor contains IR transmitter, receiver and amplifier with transistor output. The light source is a Ga-As diode emitting infrared light in short pulses. The conical tip of the sensor forms an angle of 90C. This angle acts as a prism, i.e. the beam, emitted from the GaAs diode placed in one side of the sensor head, is reflected internally to the phototransistor placed in the other side of the sensor head, provided Pipe thread ISO 228/1-G 3/8" VP0xEM, VP0xEPM that the tip of the sensor is situated in free air. If the sensor tip is immersed in a liquid, always having a refractive index different from air, the beam will not be refracted by the prism and the photo transistor will not receive any signal. The sensor types can operate in oil, waste water, aqueous solutions such as beer, wine, alcohol etc. without any kind of accessory. Pipe thread ISO 228/1-G 3/8" VP23/24EM, VP22/23/24EPM 8 70.5 20 19 O 12.6 O 14.6 19 M12 x 1 ISO 228/1-G 3/8" SW 27 VP0xEM, VP0xEPM VP22EPM-1 Wiring Diagrams BN+ BN+ BK BK VP01/03/23 EM BU- BK BK BN+ BU- BU- VP02/04/24 EM BU- BN+ VP02/04/22/24 EPM VP01/03/23 EPM Installation Hints To avoid interference from inductive voltage/ current peaks, separate the prox. switch power cables from any other power cables, e.g. motor, contactor or solenoid cables Relief of cable strain Protection of the sensing face Switch mounted on mobile carrier A proximity switch should not serve as mechanical stop Any repetitive flexing of the cable should be avoided Incorrect Correct The cable should not be pulled 2 Specifications are subject to change without notice (02.10.02)