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Raytek® Marathon MM

Industrial pyrometer with integrated visual and laser sighting

Marathon MM IR sensor
Marathon MM Control Panel
Raytek Marathon MM IR-Sensor
Marathon MM IR sensor
Marathon MM Control Panel
Raytek Marathon MM IR-Sensor

More Performance for a Broad Range of Applications

  • Document your process control with real-time video monitoring and recording capability
  • Ensure the integrity of the measurement with instant noncontact temperature readings
  • Easily configure each sensor with Remotely Adjustable Precision Variable Focus
  • Improve validation of correct aiming with integrated visual and laser sighting

The Raytek MM Sensors are rugged, NEMA 4 sealed single-piece systems with easy-to-use operator interface and the flexibility to handle nearly any application.

  • At a Glance
  • Technical Specs
  • Applications
  • Accessories
  • Resources

The Marathon MM series platform consists of five IR temperature sensor models, each with a measurement wavelength and temperature range appropriate for specific application needs, from low temperature plastic processing to high temperature glass and metals processing.

The Marathon MM features Precision Variable Focus that allows fast, easy and accurate adjustment of the focus of measurement targets, either by push-button at the rear of the instrument or remotely via an RS232/RS485 PC connection, where adjustments can be seen in real-time through video. Sensors with variable focus option can be configured according to specific application requirements, reducing the installation time and chance for incorrect installation.

The optional video sighting allows for simultaneous visual and temperature process monitoring, with the capability to capture and document any process variations. This unique capability sets a new standard for process monitoring.

Through the lens and laser sighting come standard on every unit, and optional integral video make the MM unit easy to install and operate.

All sensors feature identical installation hardware and include Raytek DataTemp Multidrop software to enable easy and consistent installation, configuration and data capture across the full breadth of an applications.

Key Features:

  • Read temperature ranges from -40 to 2250 ºC (-40 to 4082 ºF)
  • Withstand ambient temperatures from 5 to 65 °C (41 to 149 °F)* without cooling and up to 315 °C (600 ºF) with ThermoJacket™
  • Optical resolution up to 100:1
  • Precision Variable Focus from 0.2 to 2.2 m (0.7 to 72 ft)
  • Integrated through-the-lens and either video or laser sighting
  • Real-time video monitoring and recording capability
  • Response time: 20 ms
  • Compact, rugged design, IP65 / NEMA-4 rated
  • Digital RS485 communications (networkable)
  • Simultaneous analogue and digital outputs
  • DataTemp Multidrop software compatible

*Video: up to 50°C (122°F)

Model Number
Temperature Range
-40 to 800° °C
(-40 to 1472° ºF)
300 to 900 ºC
(572 to 1652 ºF)
250 to 1650 ºC
(500 to 3000 ºF)
450 to 2250 ºC
(842 to 4082 ºF)
250 to 1100 ºC
(500 to 2012 ºF)
Spectral Response
8 to 14 μm
7.9 μm
5 μm
3.9 μm
System Accuracy
± 1% of reading or ± 1°C for
Tmeas > 0°C (32°F)
± 1% of reading
± 1% of reading for
Tmeas > 350°C (662°F)
± 2°C or ± 2% for
Tmeas <350°C (662°F)
±0.5% of measured value or ±0.5°C (1°F), whichever is greater
Optical Resolution (D:S)
70 : 1
100 : 1
70 : 1
Response Time
120 mSec
60 mSec
120 mSec
Temperature Resolution
0.1 K
Adjustable; 0.10 to 1.15 in 0.001 increments
Signal Processing
Peak hold, valley hold, averaging, ambient background temperature compensation



Ambient Temperature 5 to 65°C ( 41 to 149°F) (video: 50°C/122°F)
with air cooling: 10 to 120°C (50 to 250°F)
with water cooling: 10 to 175°C (50 to 350°F)
with ThermoJacket: 10 to 315°C (50 to 600°F)
Storage Temperature -20 to 70°C (-4 to 158°F)
Environmental Rating IP65 (NEMA-4)


Standards and Compliance

EC Directive 2014/30/EU EMC
EC Directive 2011/65/EU RoHS Compliance amended by Directive (EU) 2015/863
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)
KCC Electromagnetic Compatibility applies to use in Korea. This product meets requirements for industrial (Class A) electromagnetic wave equipment.

Raytek Marathon MM pyrometers can be used across numerous industries, from low temperature plastic processing to high temperature glass and metals processing, including the list below and many others.

Click here if you would like to speak with an expert to discuss your application

Each Raytek Marathon MM model includes through-the-lens sighting, mounting nut (stainless steel), fixed bracket (stainless steel), an operator's manual and DataTemp Multidrop Software.

Additional accessories are available:

  • Sight Tube made from stainless steel up to 800°C/1472°F (XXXTST12)
  • Sight Tube made from ceramic up to 1500°C/2732°F (XXXTSTC12)
  • Pipe Thread Adapter made from stainless steel (XXXMMACPA)
  • Protective Window for LT, MT, G5 (XXXMMACTWL)
  • USB/RS485 Converter (XXXUSB485)
  • Industrial Power Supply 100/240 VAC to 24 VDC, 1.25 A (XXXSYSPS)
  • Low Temp Cable (XXX2CLTCB…)
  • High Temp Cable (XXX2CCB…)
  • Terminal Block (XXXMATB)
  • Terminal Block including 24 VDC power supply (110/230 VAC input) and IP65/NEMA-4 rated housing (RAYMAPB)
  • ThermoJacket enclosure for ambient temperatures to 315°C/600°F (RAYTXXTJ4), see also ThermoJacket datasheet
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