Two-Color Pyrometer Metis

Two-Color Pyrometer Metis

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Two-Color- or Ratio- Pyrometers are typical names for pyrometers which measure temperatures from the ratio of radiation signals of two adjacent wavelengths as opposed to measuring the absolute intensity like single wavelength units do. The advantages for customers are the following:

  • Gray bodies, i.e., targets with the same emissivity on both wavelengths, can be measured without emissivity setting.
  • There is automatic compensation for dust, smoke or a dirty viewing window between pyrometer and target.
  • Temperature errors are minimized if the target is too small or moving and the field of measurement can’t be completely covered.

Metis Two-Color Pyrometers have universal applications, which means that they can also be used as two-color pyrometers as well as single wavelength pyrometers. In single wavelength mode, customers have the choice of deriving the analog output signal from shorter or longer wavelengths, or both. Using digital communication these temperature measurement results can be recorded and compared, to determine quickly whether the target is a „gray body“ radiator or not.

Temperature Ranges and Spectral Responses :




Spectral Response

0.7-1.1 μm

1.45-1.8 μm




Additional Specifications :

Measurement Uncertainty:

Fullscale temperatures < 1500oC: 0.3% of measured value in oC + 1oC
Fullscale temperatures < 1800oC: 0.5% of measured value in oC + 1oC
Fullscale temperatures < 2500oC: 1% of measured value in oC


0.1% of measured value in oC + 1oC

Speed of Response: t90

2 ms with dynamic adaptation at low signal levels, adjustable up to 10 s

Analog Output Signal:

0 or 4 - 20 mA selectable, 500 Ω max. load

Digital Interface:

Either RS 232 or RS 485 max. 57,6 kBd (standard supply), Profibus (optional)

Temperature Resolution:

Analog < 0.1% of adjusted temperature range, digital 0.1oC

Ambient Temperature Range:

Pyrometer: operation -10 - 70oC, storage -20 - 70oC, Fiber Optic Cable and Lens: 0-250oC

Power Supply:

24 V AC/DC (12 - 30 V AC/DC), AC: 48 - 62 Hz, max. 7,5 VA


Power supply, analog and digital output are galvanically isolated against each other and against housing

Housing and Rating:

Extruded aluminium profile, IP 65 per DIN 40 050


500 g

CE Label:

According to EU directives for electromagnetic immunity

Laser Pointer:

(optional) 650 nm, < 1 mW, class II per IEC 60825-1-3-4

Camera Modul:


Video Signal:

Isolated BAS signal about 1 VSS at 75 Ω, CCIR standard, 50 Hz


Black/white 628 x 582 pixel

Field of View:

266 to 380:1, depending on Model,distance and optics type

Signal Port:

Cinch connector with SCART adapter connected to cable assembly (accessory)

Date, Time:

Real time clock with 5 year buffer

Image Overlays:

Reticule, model no. or text of your choice, max. 12 characters, time or date, temperature and emissivity