VPB2MPA Carlo Gavazzi

VPB2MPA, Photocells Level Sensors Models VPA, VPB, Modulated Light, VPB2MPA, Optical level probe with modulated infrared light for liquid detection, with built-in amplifier. Transmitter and receiver incorporated in a solid box behind the tip. Designed for direct mounting on the tank wall. The polysulfone tip is especially resistant to most acids and bases., VPB2MPA, The sensor contains an IP transmitter (infrared), receiver and amplifier with open collector output NPN or PNP. The light source is a Ga-As diode that emits modulated light, infrared light in short pulses. This sensor is insensitive to ambient light (up to 50,000 lux) and suitable for adhesive liquids. The conical tip of the sensor forms an angle of 90°C. This angle acts as a prism, that is, the beam emitted by the Ga-As diode located on one side of the sensor cadeza, is reflected internally to the phototransistor located on the other side of the sensor head, provided that the tip of the sensor is outdoors (fig. 1). If the sensor tip is inserted into a liquid, as long as it has a refractive index other than air, the beam will be refracted into the liquid (Fig. 2). The different types of sensor can operate in oil, wastewater, aqueous solutions such as beer, wine, alcohol, etc. without any type of accessory.