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Optomax Basic Range of Liquid Level Switches

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Specification

TECHNICAL SPECIFICATIONS

Supply Voltage (Vs) Any with suitable LED current limiting resistor
LED Forward Current (If) 10mA recommended
Output Signal Phototransistor open collector. Refer to circuit diagrams on datasheet
Operating Temperature -25 to +80ºC
Storage Temperatures -30 to +85ºC
Housing Materials Polysulfone (Standard)
or Trogamid
Sensor Termination 24AWG, 250mm PTFE wires, 8mm tinned
Operating Pressures 0 to 20bar (M10x1 thread)
or 0 to 7bar (All other threads)

OUTLINE DRAWINGS

Sensor mounted from inside the vessel (M10x1 thread)

liquid-level-digital_dwg_inside

Sensor mounted from outside the vessel (M12x1, 1/2″ SAE, 1/4″ NPT threads)

liquid-level-digital_dwg_outside


CIRCUIT DIAGRAMS

3-wire version

Basic 3 wire

4-wire version*

Basic 4 wire

*The 4-wire version provides galvanic isolation between the input (IR-LED) and the output (Phototransistor)

ELECTRICAL INTERFACE

3-wire version

Wire Designation
Red LED Anode
Green Output
Blue 0V

4-wire version

Wire Designation
Red LED Anode
Green Output
Blue 0V LED
Black 0V Phototransistor

Features & Benefits

FEATURES

  • Optics only solution
  • Customer is responsible for interfacing the sensor to their application
  • 3-wire (common cathode/emitter) and 4-wire (galvanically isolated) versions avaliable
  • MOQ of 500 units
  • Polysulfone or Trogamid housing material options
  • Internal or external mounting options
  • High pressure option available

BENEFITS

  • Solid state so no moving parts to cause unreliability
  • Small in size so they can be installed in applications where space is limited
  • Can detect tiny amounts of liquid when positioned correctly, ideal for leak detection
  • Fast response time
  • Repeatable switching point
  • LED current limiting resistor and phototransistor pull-up resistor can be built in to the sensor on request
  • Very robust permitting use in a wide range of fluids and chemicals
  • Low in cost for price sensitive applications

OPERATING PRINCIPLE

Liquid sensing 001_450

When in air the infrared light is reflected back to the detector

 

Liquid sensing 002_450

When in liquid the infrared light is refracted and the output switches

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