Dual Wavelength Infrared
Temperature Sensors
Dual Wavelength Temperature Sensors
  • Dual
    Wavelength
    Sensors  
  • PRO
    80
     
  • PRO
    90
      
Dual Wavelength Sensors


Dual wavelength sensors tend to measure the hottest temperature viewed in the target area which enables them to compensate for adverse application conditions.  This includes applications with varying emissivity, intervening media, and small or wandering targets.  With a unique single detector design and the industry’s highest signal dilution factor, Williamson’s dual wavelength sensors can outperform all other ratio sensors when these adverse conditions exist.
High Performance Features:
  • Temperature limits of 200-4500°F    (95-2500°C)
  • Accurate, reliable, repeatable measurements
  • Wide selection of temperature ranges and optics
  • Measures target temperature, signal strength (emissivity), signal dilution, and ambient temperature
  • Visual, laser, and fiber optic alignment options
  • A variety of installation and protective accessories
With their advanced design, these sensors include the patented ESP Filters that can be easily programmed to filter out bad readings on challenging applications.		 Applications:
These dual wavelength sensors can be used for temperature monitoring or process control with applications in challenging and harsh operating environments. They are ideal for applications involving low or varying emissivity materials, intervening media, and or partial filled field of views.  Typical applications include:
  • Ferrous Metals
  • Induction Heating
  • Vacuum Chambers
  • Glass Molds
  • Rotary Kilns
  • Molten Metal
  • Small Wires
  • Welded Tubes
PRO 80 Visual Alignment


The PRO 80 Dual-Wavelength Sensors with Visual Alignment  are used with applications involving greybody materials, like nonferrous metals, to automatically compensate for any variations in emissivity.  These sensors are also used to compensate for difficult application issues such as misalignment or intervening media.
Standard Features:
  • A wide selection of temperature ranges and optics
  • Visual Aiming (for fiber optics choose PRO 90)
  • Optional through the lens laser aiming
  • An intuitive Text based user interface
  • Programmable outputs and alarms for measured target temperature, signal strength (emissivity), signal dilution, and ambient temperature.
  • Advanced ESP Filters for Signal Strength and Signal Dilution
  • Bi-directional RS485 and RS232 communications
  • Advanced system diagnostics and status messages
  • Rugged, corrosion resistant NEMA 4 / IP65 enclosures
  • Stand alone and system configurations
  • A wide selection of accessories
Unique Features:

With a unique single detector design and the industry’s highest signal dilution factor, Williamson’s dual-wavelength sensors can outperform all other ratio sensors when demanding application issues exist. Typical difficult application issues include:
  • Low or varying emissivity
  • Intervening Media such as dirty optics, scale, smoke, steam, dust, or water spray
  • A partially filled field of view caused by a mechanical obstruction or a small or wandering target
With their advanced design, these dual wavelength sensors include the patented ESP Filters that can be easily programmed to filter out bad readings on challenging applications.

PRO 80 SERIES – Visual, Dual Wavelength Sensors
Model Nominal Wavelength Temperature Range Optical Resolution 20:1 Signal Dilution Top End Signal Dilution
Fahrenheit Celsius Large Res. Std Res. Hi Res.
Sensors for Demanding Low Temperature Applications
82-03 2 µm 200-600°F 95-315°C D/17 D/17 n/a 375°F / 190°C 500:1
82-20 2 µm 400-1100°F 200-600°C D/17 D/17 D/50 425°F / 220°C 2000:1
82-26 2 µm 500-1200°F 260-650°C D/17 D/17 D/50 425°F / 220°C 2200:1
82-40 2 µm 900-2700°F 475-1475°C n/a D/75 D/100 975°F / 525°C 2000:1
Sensors for Demanding Medium & High Temperature Applications
81-10 1.5 µm 700-2100°F 375-1150°C D/17 D/75 n/a 925°F / 500°C 6000:1
81-15 1.5 µm 750-2500°F 400-1375°C D/17 D/75 n/a 1000°F / 540°C 6000:1
81-20 1.5 µm 900-3200°F 475-1750°C D/17 D/100 D/120 1225°F / 660°C 6000:1
81-30 1.5 µm 1000-4000°F 550-2200°C D/17 D/100 D/120 1325°F / 720°C 6000:1
81-40 1 µm 1100-2000°F 600-1100°C D/17 D/30 n/a 1300°F / 700°C 2250:1
81-50 1 µm 1300-2500°F 700-1375°C D/17 D/75 n/a 1500°F / 815°C 2250:1
81-65 1 µm 1600-3200°F 875-1750°C D/25 D/100 D/150 1800°F / 980°C 2250:1
81-70 1 µm 1700-4500°F 925-2475°C D/25 D/100 D/150 2275°F / 1250°C 2250:1

Options and Accessories:
  • 23 – Remote Interface Module with Power Supply
  • PS – Universal Power Supply
  • LA – Laser Aiming
  • SB - Swivel Bracket
  • AP - Air Purge
  • WCAP - Water Cooling Air Purge
Resources:

PRO Series Brochure (PDF)

Dual Wavelength Temperature Systems Brochure (PDF)

PRO 80 & 90 Datasheet (PDF)

Application Worksheet (PDF)
PRO 90 Fiber Optic Alignment


The PRO 90 Dual-Wavelength Sensors with Fiber Optics are used with applications involving greybody materials,  like nonferrous metals, to automatically compensate for any variations in emissivity.  These sensors are also used to compensate for difficult application issues such as misalignment or intervening media. With the fiber optic configuration, it is possible to view a target and mount the sensor electronics in a remote or more convenient location.  This provides greater durability and flexibility with sensor installations that involve confined spaces and/or severe environments.
Standard Features:
  • A wide selection of temperature ranges and optics
  • Fiber optic alignment with a small, sealed fiber cable
  • Optional Integrated Aim Light to verify alignment
  • An intuitive Text based user interface
  • Programmable outputs and alarms for measured target temperature, signal strength emissivity), signal dilution, and ambient temperature
  • Advanced ESP Filters for Signal Strength and Signal Dilution
  • Bi-directional RS485 and RS232 communications
  • Advanced system diagnostics and status messages
  • Rugged, corrosion resistant NEMA 4 / IP65 enclosures
  • Stand alone and system configurations
  • A wide selection of accessories
Unique Features:

All of Williamson’s fiber optic sensors use a small, sealed fiber optic cable with an ambient limit of 400°F (200°C) to enable access to difficult to reach targets and to survive hostile operating conditions.  In addition, Williamson offers several unique fiber cable options that can enable measurements on applications that were previously considered difficult to measure.  This includes the ArmorGuard System, the Stainless Steel Braid System, and the Gooseneck System.

With a unique single detector design and the industry’s highest signal dilution factor, Williamson’s dual-wavelength sensors can outperform all other ratio sensors when demanding application issues exist. Typical difficult application issues include:
  • Low or varying emissivity
  • Intervening Media such as dirty optics, scale, smoke, steam, dust, or water spray
  • A partially filled field of view caused by a mechanical obstruction or a small or wandering target
With their advanced design, these dual wavelength sensors include the patented ESP Filters that can be easily programmed to filter out bad readings on challenging applications.

PRO 90 SERIES – Fiber Optic, Dual Wavelength Sensors
Model Nominal Wavelength Temperature Range Optical Resolution 20:1 Signal Dilution Top End Signal Dilution Type of Cable Max Length
Fahrenheit Celsius No Lens Std Res. Hi Res.
Sensors for Demanding Applications -
92-20 2 µm 400-1100 200-600 D/2 D/12 D/50 525°F 275°C 2000:1 Quartz 3ft 91cm
92-25 2 µm 500-1100 260-600 D/2 D/35 D/50 525°F 275°C 2000:1 Quartz 3ft 91cm
92-40 2 µm 900-2700 475-1475 D/2 D/50 D/75 1025°F 550°C 2000:1 Quartz 6ft 1.8m
91-10 1.5 µm 700-2100 375-1150 D/2 D/35 D/50 925°F 500°C 6000:1 Quartz 30ft 9.1m
91-15 1.5 µm 750-2500 400-1375 D/2 D/35 D/50 1000°F 540°C 6000:1 Quartz 30ft 9.1m
91-20 1.5 µm 900-3200 475-1750 D/2 D/50 D/75 1225°F 660°C 6000:1 Quartz 30ft 9.1m
91-30 1.5 µm 1000-4000 550-2200 D/2 D/50 D/75 1325°F 720°C 6000:1 Quartz 30ft 9.1m
91-40 1 µm 1100-2000 600-1100 D/.75 D/12 D/50 1300°F 700°C 2250:1 Glass 20ft 6m
91-50 1 µm 1300-2500 700-1375 D/.75 D/35 D/50 1500°F 815°C 2250:1 Glass 25ft 7.6m
91-65 1 µm 1600-3200 875-1750 D/.75 D/50 D/75 1800°F 980°C 2250:1 Glass 30ft 9.1m
91-70 1 µm 1700-4500 925-2475 D/.75 D/50 D/75 2275°F 1250°C 2250:1 Glass 30ft 9.1m

Options and Accessories:
  • 23 – Remote Interface Module with Power Supply
  • PS – Universal Power Supply
  • AL – Integrated Aim Light
  • FOSB – Fiber Optic Swivel Bracket
  • AP - Air Purge
  • WCAP - Water Cooling Air Purge
  • AG - ArmorGuard System
  • SSB - Stainless Steel Braid System
  • GN - Gooseneck System
Resources:

PRO Series Brochure (PDF)

Dual Wavelength Temperature Systems Brochure (PDF)

PRO 80 & 90 Datasheet (PDF)

Application Worksheet (PDF)