Photoelectrics Level Sensors Types VP, Modulated, Metal Housing Modulated light Built-in amplifier Output: NPN or PNP, 4-wire (NO & NC) Housing: Stainless steel or nickel plated brass Tip: Polysulphone or glass High chemical resistance to most acids and bases Liquid and electrical circuit completely isolated Power supply: DC models 10 to 40 VDC Product Description Ordering Key VPB1 M NA-1 Optical level probe with sealed behind the tip. Type: Refraction principle modulated infrared light for Designed for direct mounting Housing material detection of liquids. Self- through the wall of a tank. Tip material contained unit has built-in The polysulphone tip is espe- Light source amplifier. Separate transmit- cially resistant to most acids Output type ting and receiving elements and bases. Connection Type Selection Housing material Tip material Ordering no. Ordering no. Ordering no. Ordering no. NPN, Make & NPN, Make & PNP, Make & PNP, Make & Break switching Break switching Break switching Break switching Cable M12 Plug Cable M12 Plug Stainless steel Polysulphone VPA1MNA VPA1MNA-1 VPA1MPA VPA1MPA-1 Stainless steel Glass VPA2MNA VPA2MNA-1 VPA2MPA VPA2MPA-1 Nickel plated brass Polysulphone VPB1MNA VPB1MNA-1 VPB1MPA VPB1MPA-1 Nickel plated brass Glass VPB2MNA VPB2MNA-1 VPB2MPA VPB2MPA-1 Specifications Rated operational voltage 10 - 40 VDC Pressure 10 bar at +60C (+ 140F) Ripple 10 V Environment Degree of protection IP 67 Output current Operating temperature -20 to +80C (-4 to +176F) Continuous 200 mA Storage temperature -40 to +100C (-40 to +212F) No-load supply current 7 mA Liquid temperature +100C (+212F) for 60 s Voltage drop 2.5 VDC Housing material Stainless steel AISI 303 or Protection Reverse polarity, nickel plated brass short circuit, transients 2 Cable 2 m, 4 x 0.3 mm , grey, 5.2 Ambient light 50.000 lux oil resistant PVC Transient voltage 1 kV Resistance 100 , extension possible Delay after power-on 20 ms Weight 90 g Operating frequency 30 Hz Tightening torque Stainless steel 30 Nm Indication for Nickel plated brass 30 Nm Output ON LED, yellow No LED indication on plug types External thread 3/8 (ISO 228/1) Sensing accuracy CE-marking Yes Liquid level difference Horizontal mounting: 5 mm LED indication on plug types Vertical mounting: 2.5 mm Specifications are subject to change without notice (02.03.2006) 1VP, modulated Mode of Operation The probe contains IR trans- the sensor head, is reflected mitter, receiver and amplifier internally to the phototransis- with open collector NPN or tor placed in the other side of PNP output. The light source the sensor head (fig. 1), pro- is a Ga-As diode emitting vided that the tip of the sensor Fig. 1 Fig. 2 modulated, infrared light in is situated in free air. If the Receiver Transmitter Receiver Transmitter short pulses. sensor tip is immersed in a Refraction liquid, always having a refrac- into liquid This level probe is thus insen- tive index different from air Internal sitive to ambient light (up to (fig. 2), the beam will be reflection 50,000 lux) and suitable even refracted into the liquid. for adhesive liquids. Liquid All types of sensors can ope- Air The conical tip of the sensor rate in oil, waste water, aque- forms an angle of 90. This ous solutions such as beer, angle acts as a prism, i.e. the wine, alcohol etc. without any beam, emitted from the Ga- kind of accessory. As diode placed in one side of Dimensions Wiring Diagrams 17 19 4 BK 2 WH SW 27 3 BU PNP VP..M.A 1 BN 17 19 2 WH 4 BK SW 27 3 BU NPN VP..M.A-1 Installation Hints To avoid interference from inductive voltage/ Relief of cable strain Protection of the sensing face Switch mounted on mobile carrier current peaks, separate the prox. switch power cables from any other power cables, e.g. motor, contactor or solenoid cables Incorrect Correct The cable should not be pulled Any repetitive flexing of the A proximity switch should not serve as mechanical stop cable should be avoided Accessories Connector type CON.1A-../CON.14NF.. or CON.1O-../CON.13NF series. 2 Specifications are subject to change without notice (02.03.2006) 14.5 14.5