System4 | High Precision

Land Instruments System4 - Fixed ThermometerSYSTEM4 thermometers offer exceptional flexibility with a choice of single wavelength, ratio, fibroptic and fibroptic ratio models. Thermometer type, temperature range, spectral response and optical characteristics are chosen to suit any application from 0 to 2600°C.

Key Features

  • Fully interchangeable thermometer and processors ensure maximum flexibility without the need for recalibration.
  • Wide range of thermometers with focusable, through-the-lens sighting or flexible fibroptics with optional laser targeting.
  • Small target capability
  • Wide range of highly effective mounting accessories
  • Rugged, flexible, modular design
  • Accurate, reliable, drift-free measurement
  • Industry standard outputs to suit any process monitoring, recording or control system

SYSTEM4 comprises an advanced range of high precision radiation thermometers, LANDMARK® processors and a range of mounting accessories which combine to form a complete temperature measurement system.
Thermometer type, temperature range, spectral response and optical characteristics are chosen to suit any application from 0 to 2600°C.

  • Focusable optics – standard and short focus versions with through-the-lens sighting providing clear and guaranteed definition of target.
  • Optional close-up lenses – giving measurement of targets as small as 0.45mm.
  • Accurate, reliable, drift-free measurement.
  • Rugged design with a range of mounting options.
  • Flexible Fiber optics light guide versions – with optional laser targeting system to define target spot.
  • High level linear output.

SYSTEM4 Radiation Thermometers

Proven, reliable electronics and a high quality optical system combine to give a thermometer which delivers accurate, dependable temperature measurement. A rugged die-cast aluminum body, with a high quality electrical connector, ensures reliable performance.
Standard bodied thermometers all feature through-the-lens sighting with a 6° field of view. Adjustable focus with a circular graticule gives precise alignment on to the smallest of targets. Two optical variants are available: Standard focus – adjustable between 500mm and infinity, and Short-focus – viewing from 350mm to 1m. Close-up lenses are also available which can measure targets as small as 0.45mm from as close as 90mm.

SYSTEM4 Fibroptic Thermometers

The use of flexible Fiber optics light guides allows the detector and electronics enclosure to be located in a less hostile environment, and enables access to difficult targets.
The SYSTEM4 fibroptic thermometers are available with an optional integral laser targeting system which defines the target spot for accurate alignment.
The use of Fiber optics permits viewing of normally inaccessible targets, where there are high magnetic fields or in high ambient temperatures up to 200 °C without cooling of the optic head. There is a choice of three optic heads and three light guide lengths.

Emissivity Enhancer

The Emissivity Enhancer improves the accuracy of SYSTEM4 short wavelength thermometers on difficult to measure materials such as bright annealed and stainless steel strip.
Intended for use on low emssivity materials it gives enhanced emissivity values.

Technical Details SYSTEM4 Standard Thermometers

Model Range Wavelength Response Time(1) Accuracy(2)
General purpose, metals, glass, refractories
M1 450/1000C 450 to 1000 °C 1µm 5 ms 0.4%K
M1 600/1600C 600 to 1600 °C 1µm 5 ms 0.4%K
M1 800/2600C 800 to 2600 °C 1µm 5 ms 0.7%K
General purpose, metals and glass processing
M2 300/1100C 300 to 1100 °C 1.6 µm 5 ms 0.25% + 1K
Bright oxidised or lightly oxidised metal surfaces
M4 50/250C 50 to 250 °C 2.4 µm 100 ms 3K
M4 150/550C 150 to 550 °C 2.4 µm 100 ms 4K
Glass surface temperature measurement
M5 400/1300C 400 to 1300 °C 4.8 to 5.2 µm 100 ms 0.6%K (4)
M5 1000/2500C 1000 to 2500 °C 4.8 to 5.2 µm 100 ms 0.6%K (4)
General purpose, low temperature, metals, glass, food, paper and textiles
M6 0/300C 0 to 300 °C 3 to 5 µm 100 ms 0.3% + 2.5K
M6 100/700C 100 to 700 °C 3 to 5 µm 100 ms 0.3% + 2K
Plastic thin film
M7 25/375C 25 to 375 °C 3.43 µm 100 ms 3K
Food, textiles, paper, plastics, rubber, wood, paint and ceramics
M8 0/1000C 0 to 1000 °C 8 to 14 µm 100 ms 1%K + 1K
Ratio thermometer, variable emissivity, target obscuration, partially filled field of view
R1 600/1600C 600 to 1600 °C 0.85 to 1.1 µm 100 ms 0.65%K
R1 1000/2600C 1000 to 2600 °C 0.85 to 1.1 µm 100 ms 1.1%K


(1) – Time quoted to 95% step change
(2) – Accuracy quoted to ITS90
(3) – Above 75 °C / 167 °F
(4) – Optimised for glass toughening = 3k at 630 °C

Technical Details SYSTEM4 Fibroptic Thermometers

Model Range Wavelength Response Time (1) Accuracy (2)
General purpose, metals, glass, refractories
M1 600/1600CYL 600 to 1600 °C 1µm 5 ms 0.4%K
M1 800/2600CYL 800 to 2600 °C 1µm 5 ms 0.7%K
General purpose, metals and glass processing
M2 300/1100CYL 300 to 1100 °C 1.6 µm 5 ms 0.25% + 1K
General purpose, low temperature and secondary metals
M3 50/250CQ (3) 50 to 250 °C 2.1 µm 100 ms 3K
Ratio thermometer, variable emissivity, target obscuration, partially filled field of view
R1 600/1600CYL 600 to 1600 °C 0.85 to 1.1 µm 100 ms 0.65%K
R1 1000/2600CYL 1000 to 2600 °C 0.85 to 1.1 µm 100 ms 1.1%K

Y – Denotes laser targetting system available
(3) – Above 75 °C

  System4 High Precision – Datasheet

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