The Thermalert 4.0 Series Pyrometers from Fluke Process Instruments include numerous integrated infrared temperature sensors with our widest selection of spectral ranges that can be used for a wide variety of process control applications.

Each pyrometer conforms to Industry 4.0 standards, combines innovative digital technology with standard two-wire installations for all setups and can be ordered with ATEX and IECEx certification. With multiple communication options, this smart infrared measurement sensor provides the features you need to understand your temperature data and control your unique process in a compact, integrated package that is easy to install and operate.

Thermalert 4.0 Pyrometers

With the ability to withstand ambient temperatures up to 85°C (185°F) without extra cooling, as well as multiple wavelength options to support a broad range of applications, Thermalert 4.0 Series Pyrometers can provide a complete picture of even the harshest environments.

Each pyrometer is designed with best-in-class optical resolution, which varies based on the application, and multiple communication options to meet your process requirements – including 2-wire loops powered by RS485, digital outputs (Ethernet, EthernetIP, ProfinetIO) and analog outputs.

Laser sighting, ATEX/IECEx certification and a broad range of accessories (including high temperature enclosures) are also available for all models.

Key Features:

Durable stainless steel IP65 / NEMA4 enclosures
Read temperature ranges from -40 °C to 2300 °C (-40 ºF to 4172 °F)
Withstands ambient temperatures from -20 °C to 85 °C (-4 °F to 185°F)
Intrinsically safe models (ATEX/IECEx/CCC-IS certification)
Integrated laser sighting
Galvanic isolated outputs
Plastic lens option for food applications
Analog input for ambient compensation and adjusting emissivity setting
Multiple communication interfaces:
- 2-wire loop powered for analog communication
- 2-wire loop options specifically for HART protocols
- 4-wire (Fieldbus Support – Ethernet, EthernetIP, ProfinetIO)
- 12-wire M16 and 6-pin terminal block for digital communication (RS485)
Advanced signal processing
Wide choice of focus distances

DataTemp® Multidrop Software

Thermalert 4.0 infrared sensors can be integrated with your process control system with the DataTemp® Multidrop Software. Each software solution provides you with the tools you need to “plug and play,” by quickly configuring your sensors and then monitoring temperatures with a real-time graphical display.

The software’s bar graph feature shows temperature profiles at various spots across your process. The program can also record and archive process temperatures, as well as show high- and low-alarms, making it easy to identify when conditions are beyond your set parameters.

Technical Specs for Thermalert Models: LT, G5, G7, P7, P3

Model Number	LT	G5	G7	P7	P3
Temperature Range	-40 to 1000ºC (-40 to 1832ºF)	250 to 2250ºC (482 to 4082ºF)	300 to 900ºC (572 to 1652ºF)	10 to 360ºC (50 to 680ºF)	25 to 450ºC (77 to 842ºF)
Spectral Response	8 to 14 µm	5 µm	7.9 µm	7.9 µm	3.43 µm
System Accuracy	for Tmeas > 0°C (32°F): ±1% of reading or ±1.0°C (2.0°F) for Tmeas ≤ 0°C (32°F): ±[1.0°C + 0.1* (0°C – Tmeas )] with Tmeas in °C; ±[2.0°F + 0.1* (32°F – Tmeas )] with Tmeas in °F				for Tmeas > 75°C (167°F): ±(3°C + 1% of reading)
Repeatability	±0.3°C (0.6°F) or 0.3% of reading				±1°C (2°F) or 0.5% of reading
Response Time	LT-07, LT-15, LTD-04: 150ms LT-30, LTB-30: 30ms LT-50, LT-70: 130ms	G5-30, G5-70: 60ms	G7-70: 130ms	P7-30: 130ms	P3-20: 130ms
Optical Resolution (D:S)	LTD-04: 4:1 LT-07: 7:1 LT-15: 15:1 LT-30, LTB-30: 33:1 LT-50: 50:1 LT-70: 70:1	G5-30: 33:1 G5-70: 70:1	G7-70: 70:1	P7-30: 33:1	P3-20: 20:1
Focus Distance	LT-07: CFO 50mm (2in) LT-15, LTD-04: SFO 1520mm (60in) LT-30, LTB-30: SFO 1520mm (60in) CF1 76mm (3in) CF2 200mm (7.9in) LT-50: SFO 1520mm (60in) CF2 200mm (7.9in) LT-70: SF2 1250mm (49in) CF2 200mm (7.9in)	G5-30: SFO 1520mm (60in) G5-70: SF2 1250mm (49in)	G7-70: SF2 1250mm (49in)	P7-30: SF0 1520mm (60in)	P3-20: SF4 500mm (20in)
Smallest Measurement Spot	LT-07: CF 7.1mm (0.28in) LT-30, LTB-30: CF1 2.3mm (0.09in) CF2 6.1mm (0.24in) LT-50: CF2 4mm (0.16in) LT-70: SF2 17.9mm (0.7in) CF2 2.9mm (0.11in)	G5-70: SF2 17.9mm (0.7in)	G7-70: SF2 17.9mm (0.7in)
Standards and Compliance	EC – Directive 2014/30/EU – EMC EC – Directive 2011/65/EU – RoHS Compliance amended by Directive (EU) 2015/863 EC – Directive 2014/34/EU – ATEX valid for models: T40-xx-xx-xxx-x-IS EC – Directive Nr. 1907/2006 – REACH amended by Directive (EU) 2020/2096 EN 61326-1: 2013 - Electrical measurement, control and laboratory devices - Electromagnetic susceptibility (EMC) EN 50581: 2012 - Technical documentation for the evaluation of electrical products with respect to restriction of hazardous substances (RoHS) EN 60079-0: 2019 Risk of explosion – part 0: general requirements (ATEX) EN 60079-11: 2012 Risk of explosion – part 11: device protection by intrinsic safety “I” (ATEX) UKCA - Conforms to UK Conformity. Except for units with intrinsically-safe rating. KCC - Electromagnetic Compatibility Applies to use in Korea only. Class A Equipment (Industrial Broadcasting & Communication Equipment)

Technical Specs for Thermalert Models: MT, HT, 3M, 2M, 1M

Model Number	MT	HT	3M	2M	1M
Temperature Range	250 to 2250ºC (482 to 4082ºF)	500 to 2000ºC (932 to 3632ºF)	100 to 600ºC (212 to 1112ºF)	250 to 1400ºC (482 to 2552ºF)	500 to 2300ºC (932 to 4172ºF)
Spectral Response	3.9 µm	2.2 µm	2.3 µm	1.6 µm	1 µm
System Accuracy	for Tmeas > 0°C (32°F): ±1% of reading or ±1.0°C (2.0°F) for Tmeas ≤ 0°C (32°F): ±[1.0°C + 0.1* (0°C – Tmeas )] with Tmeas in °C; ±[2.0°F + 0.1* (32°F – Tmeas )] with Tmeas in °F		±(2°C + 0.5% of reading)
Repeatability	±0.3°C (0.6°F) or 0.3% of reading		±1°C (2°F) or 0.25% of reading
Response Time	MT-30, MT-70: 130 ms	HT-60: 130 ms	3M-70: 20ms	2M-150, 1ML-150, 1MH-150: 10ms
Optical Resolution (D:S)	MT-30: 33:1 MT-70: 70:1	HT-60: 60:1	3M-70: 70:1	2M-150, 1ML-150, 1MH-150: 150:1
Focus Distance	MT-30: SF0 1520mm (60in) CF1 76mm (3in) CF2 200mm (7.9in) MT-70: SF2 1250mm (49in) CF1 76mm (3in) CF2 200mm (7.9in)	HT-60: SFO 1520mm (60in) CF1 76mm (3in) CF2 200mm (7.9in)	3M-70: SFO 1520mm (60in) CF2 200mm (7.9in)	2M-150, 1ML-150, 1MH-150: SFO 1520mm (60in) CF2 200mm (7.9in)
Smallest Measurement Spot	MT-30: CF1 2.3 mm (0.09 in) CF2 6.1 mm (0.24 in) MT-70: SF2 17.9 mm (0.7 in) CF1 1.1 mm (0.04 in) CF2 2.9 mm (0.11 in)	HT-60: CF1 1.3mm (0.05in) CF2 3.3mm (0.13in)	3M-70: CF2 2.9mm (0.11in)	2M-150, 1ML-150, 1MH-150: SFO 10.1mm (0.4in) CF2 1.3mm (0.05in)
Standards and Compliance	EC – Directive 2014/30/EU – EMC EC – Directive 2011/65/EU – RoHS Compliance amended by Directive (EU) 2015/863 EC – Directive 2014/34/EU – ATEX valid for models: T40-xx-xx-xxx-x-IS EC – Directive Nr. 1907/2006 – REACH amended by Directive (EU) 2020/2096 EN 61326-1: 2013 - Electrical measurement, control and laboratory devices - Electromagnetic susceptibility (EMC) EN 50581: 2012 - Technical documentation for the evaluation of electrical products with respect to restriction of hazardous substances (RoHS) EN 60079-0: 2019 Risk of explosion – part 0: general requirements (ATEX) EN 60079-11: 2012 Risk of explosion – part 11: device protection by intrinsic safety “I” (ATEX) UKCA - Conforms to UK Conformity. Except for units with intrinsically-safe rating. KCC - Electromagnetic Compatibility Applies to use in Korea only. Class A Equipment (Industrial Broadcasting & Communication Equipment)

Thermalert 4.0 Pyrometers can be used across numerous industries and are ideal for process monitoring and control, product monitoring and more in applications spanning metals, plastics, oil and gas, glass and food. Several examples of where Thermalert 4.0 can be used include, but are not limited to, the following list below. Click here if you would like to speak with an expert to discuss your application

Thermalert 4.0 Model Spectral Response	Applications
LT 8-14 µm	Thick plastics, asphalt, carpeting, coated paper, thermoforming, food, coke, coal, cement
G5 5 µm	Glass surface temperature for bending, tempering, annealing and sealing
G7 7.9 µm	Ultra-thin drawn glass
P3 3.43 µm	Extrusion and converting of thin films: polyethylene, polypropylene, and polystyrene
P7 7.9 µm	Production and converting of films of polyester (PET), fluoroplastic, Teflon®, acrylic, nylon (polyamide)
MT 3.9 µm	Furnace refractory, flame hardening and brazing
HT 2.2 µm	Ferrous and nonferrous metals, induction heating, furnaces, laboratory research
1M 1 µm	Semiconductor, metals forging, molten glass
2M 1.6 µm	Non ferrous and unoxidized metals, galvanizing lines and steel annealing
3M 2.3 µm	Rolling mills, wire coating and annealing, laser welding, plastic tubing extensions
3M 2.3 µm	Rolling mills, wire coating and annealing, laser welding, plastic tubing extensions
C02 4.24 μm	Flame or flue gas temperature measurement for incineration plants, boilers or power station
C0 4.64 μm	Flame or flue gas temperature measurement for incineration plants, boilers or power station
NOX 4.47 μm	Flame or flue gas temperature measurement for incineration plants, boilers or power station

Atex certification and related applications

Industry	Application	Atex Type of Certification
Steel	Galvanizing, annealing, plating and coating with hydrogen atmosphere	Gas II 2G Ex ib IIC T4 Gb
Solar	Hydrogen reduction	Gas II 2G Ex ib IIC T4 Gb
Petrochemical	Sulfur recovery, boilers, crackers, reactors, pipes, flare control	Gas II 2G Ex ib IIC T4 Gb
Chemical	Fertilizer, starch, alcohols, flour, vinyl	Gas II 2G Ex ib IIC T4 Gb
Fire detection	Offshore installations, storage areas, indoor coke handling, dust extraction	Dust II 2D Ex ib IIIC T135°C Db IP65
Storage terminals	Storage of coal, wood pellets, sulfur, petroleum coke, starch, fluids	Dust II 2D Ex ib IIIC T135°C Db IP65

Lens Protectors and Air Purge Collars

Lens protectors and air purge collars are independent accessories that help ensure dust, moisture and airborne particles are kept away from the pyrometer lens.

Water- or Air-Cooled Housing

The water- and air-cooled housing options can be specified for use in ambient temperatures up to 175°C (315°F).

ThermoJacket

For harsher environments, the ThermoJacket can protect the sensor in ambient temperatures of up to 315°C (600°F). It completely encloses the pyrometer, combining thermal and mechanical protection while air purging the lens. Pyrometers can be installed or removed while the ThermoJacket is in its mounted position.

Manuals:

Thermalert 4.0 Manual

Product Literature:

Thermalert 4.0 Brochure

Thermalert 4.0 Datasheet

Spot Size Calculator:

Calculate Distance to Target Size