OPT Optical Level Sensor

Brand: KOBOLD Instruments, Inc.

The optical level sensors of model OPT have been developed for monitoring transparent liquids. Due to the very small dimensions, very slight switching hysteresis and high repeatability, the instruments are also suited for service in small vessels.

The optical sensor is situated in a robust housing.

It comprises a plastic hollow hemisphere, in which the infrared diode is fitted as a transmitter and a semiconductor as a receiver. When the sensor is not wetted by liquid, the infrared light is reflected fully from the surface of the hemisphere to the receiver.

As soon as the sensor is covered with liquid, the refractive index on the boundary layer changes and most of the light escapes into the liquid.

Less light then reaches the receiver, which allows switching to take place. The level probe should not be fitted with the sensor pointing downwards, as errors can occur due to drops of liquid sticking to it.

Specifications

Applications

  • Drinks Vending Machines
  • Leakage Protection
  • Medical Technology
  • Motor Vehicle Industry

BSP Connection

  • G 1/2"

Cable Length

  • 5 feet (1.5 metres), Ø 0.177" (Ø 4.5 mm) - Cable

Cable Material

  • Polyurethane

Electrical Contacts

  • N/C Contact
  • N/O Contact

Enclosure / Body Material

  • 304L Stainless Steel
  • Polypropylene

Environmental Protection

  • IP68
  • NEMA 6

Gasket Material

  • FPM

Hysteresis

  • ± 0.039" (± 1 mm)

Input

  • 15 mA at 5 Vdc
  • 17 mA at 24 Vdc

Maximum System Pressure

  • psi: 145 (bar: 10, kPa: 1,000)

NPT Connection

  • 1/2" NPT Male

Nut & Bolt Material

  • Polyamide - Hexagon Nut

Operating Temperature

  • -20° to 80° C (-4° to 176° F)

O-Ring Material

  • FPM

Output

  • 200 mA, Short-Circuit-Proof - OPT-4 & OPT-5
  • 3 mA At, Maximum
  • Maximum
  • NPN
  • Open Collector

Power Requirement

  • 24 Vdc ± 15 %
  • 5-12 Vdc ± 5 %

Repeatability

  • ± 0.039" (± 1 mm)

Response Time

  • 1 second - with Falling Level
  • 50 µs - with Rising Level

Sensor / Probe Material

  • Polysulfone

Switch Type

  • NPN Open Collector

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