Optomax Industrial Glass Range Liquid Level Switches

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Supply Voltages (Vs) 4.5 to 15.4Vdc
or 8 to 30Vdc
Supply Currents (Is) 2.5mA max. (Vs = 4.5 to 15.4Vdc)
or 7.5mA max. (Vs = 4.5 to 30Vdc)
Output Sink and Source Current (Iout) 1A
Operating Temperatures -40 to +125°C
Storage Temperatures Standard: -40 to +125°C
Housing Material Stainless steel housing with glass sensing tip
Sensor Termination 20AWG, 250mm PTFE wires, 8mm tinned
Operating Pressure Up to 600 bar depending on housing type




Output Voltage (Vout): Iout = 1A
Vs = 4.5 to 15.4Vdc
Output High Vout = Vs – 1.5V max
Output Low Vout = 0V + 0.5V max
Output Voltage (Vout): Iout = 1A
Vs = 8 to 30Vdc
Output High Vout = Vs – 1.8V max
Output Low Vout = 0V + 0.7V max


Wire Designation
Red Vs
Green Output*
Blue 0V

*See part numbering guide for output type and logic


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Features and Benefits


  • Reverse polarity, ESD and transient over-voltage protected
  • Wide supply voltage ranges
  • N and P type output configurations, capable of sinking or sourcing up to 1A, can directly drive loads
  • Extended temperature ranges available
  • Rated 316L stainless steel housing with glass sensing tip
  • Thread options for external mounting
  • Up to 600bar operating pressure


  • Side or top vessel mounted
  • 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
  • Built-in output delays available on request for applications where sloshing causes intermittent switching
  • Robust construction permitting use in a wide range of demanding applications
  • Compatible with most fluids and chemicals, suitable for acids and solvents
  • Can operate in demanding, corrosive environments due to its robust construction and ability to operate in high pressure and temperature environments
  • Suitable for below zero applications
  • Corrosion and shock resistant
  • Maintenance free


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



  • Pump protection
  • Empty pipe detection
  • Pump control (limit detection)
  • Low/high/intermediate level control/alarm
  • Overfill prevention/protection
  • HVAC
  • Refrigeration
  • Hydraulic levels
  • Distillation columns
  • Liquid gas control (refrigerants)
  • Gas/oil seperators
  • Power plant heater vessels
  • Bulk liquid storage

  • Fixed roof tanks
  • Floating roof tanks
  • Spherical tanks
  • Bullet tanks
  • Process vessels
  • Boiler drums
  • Seperator tanks
  • Blending drums
  • Chillers
  • Intercoolers
  • Liquefied ammonia
  • Pressure vessel liquid levels
  • Over-spill protection

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