Infrared Pyrometer for Diverse Temperatures


Thermalert 4.0 is a versatile infrared spot pyrometer for automatic, noncontact temperature measurement in harsh industrial environments. Intended for use with temperatures of -40 to 4,082°F (-40 to 2,250°C), the pyrometer series comprises 13 models with varied spectral responses, including dedicated sensors for metals, glass, plastics, paper, and food products.


Backed by 150 years of industrial experience, the Thermalert 4.0 is a smart, integrated sensor providing temperature measurement performance suitable for demanding factory automation applications. The device offers a choice of optics for long and short focal distances, and its exceptional ambient temperature range of 68 to 185°F (-20 to 85°C) enables measuring points to be set up without any extra cooling.


Compact and rugged, the Thermalert 4.0 provides best-in-class repeatability, response time, and accuracy. The advanced IP65/NEMA4 instrument employs real-time background temperature compensation and laser aiming, and its DataTemp Multidrop system software supports remote configuration, monitoring, field calibration, and firmware updates. These functions can significantly lower service costs and time spent on setup and troubleshooting. Plug & play operation further facilitates installation and maintenance.


Reliable and easy to operate, the new pyrometer delivers outstanding optical resolution. Two-wire loop-powered, RS-485 and analog outputs are available to meet diverse user requirements. In addition, galvanic insulation ensures correct readings. Up to 32 devices can be connected as part of an RS485 network. Additional Fieldbus options are planned for the future. Moreover, retrofit of existing measuring points has been made as easy as possible.


A wide variety of options and accessories are available to customize the installation of Thermalert 4.0 sensors. Lens protectors and air purge collars offer protection under severe conditions. Water- and air-cooled housings can be specified for operation in ambient temperatures up to 315°F (175°C). For extremely challenging environments, the ThermoJacket is recommended. This rugged cast aluminum housing protects the sensor in ambient temperatures to 600°F (315°C).


The Thermalert 4.0 is backward compatible with legacy Raytek and Ircon; sensors, and can be equipped with fixtures for Endurance, Thermalert TX, and XR pyrometers. Adapters are available for use with Modline 4 and Marathon MM fixtures.


  • Conforms to Industry 4.0 standards
  • Integrated laser sighting
  • Galvanic isolated outputs
  • Plastic lens option for food application
  • Analog input for ambient compensation and adjusting emissivity setting
  • USB for easy setup
  • Simple, two-wire or digital installation
  • Backward compatibility to old Raytek and Ircon in-class sensors and accessories
  • Wide temperature ranges from -40 to 2,300°C (-40 to 4,172°F)
  • Advanced signal processing
  • Wide choice of focus distances
Temp. RangeOptical
LT: 8 to 14 µm
-40 to 1,000ºC
(-40 to 1,832ºF)
Low-temp. applications: thick plastics,
asphalt, carpeting, coated paper,
thermoforming, food
G5: 5 µm
250 to 2,250ºC
(482 to 4,082ºF)
Glass surface temp. for bending,
tempering, annealing, and sealing
G7: 7.9 µm
300 to 900ºC
(572 to 1,652ºF)
Ultra-thin drawn glass
P3: 3.43 µm
25 to 450ºC
(77 to 842ºF)
Extrusion/converting thin films:
polyethylene, polypropylene, & polystyrene
P7: 7.9 µm
10 to 360°C
(50 to 680°F)
MT: 3.9 µm
200 to 2,250°C
(392 to 4,082°F)
Furnace refractory/flame hardening/brazing
HT: 2.2 µm
500 to 2,000°C
(932 to 3,632°F)
Ferrous/nonferrous metals,
induction heating, furnaces,
laboratory research
1M: 1 µm
500 to 2,300°C
(932 to 4,172°F)
Semiconductor/metals forging/
molten glass
2M: 1.6 µm
250 to 1,400°C
(482 to 2,552°F)
Nonferrous/unoxidized metals,
galvanizing lines, & steel annealing
3M: 2.3 µm
100 to 600°C
(212 to 1,112°F)
Rolling mills, wire coating & annealing,
laser welding, plastic tubing extensions
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