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Use at High Ambient
Temperatures and
with Glowing Objects

Due to their robust design, sensors for hot ambient temperatures are ideal for use in demanding industrial plants, such as the automotive, glass and steel industries. In addition to being suitable for use in high temperature ranges, the sensors are also designed for measurements on red glowing surfaces. Variants with blue laser enable reliable results on glowing objects.

Challenges with High Ambient Temperatures and Hot Materials

High Emissivity

Challenge: Glowing objects have a high emissivity, meaning that they emit a lot of heat radiation. Due to the intense heat radiation and high temperatures, they can influence the measured values of the sensors.


Solution: 
 

Mirrorings and Reflections from Hot Media

Challenge: Hot liquid media present a challenge due to their moving, non-solid surface and the frequent reflections that occur. Reflective liquids in particular reflect light or laser beams irregularly, which can lead to multiple distance signals. 

Solution:
Time-of-flight laser distance sensors enable reliable measurement of hot and liquid media. The sensors are able to detect several objects in the measuring range and to suppress the disturbing reflections. This makes it possible to separate the relevant signal of the liquid medium from the signal of a disturbing background. In this way, the measurement signal remains stable even under challenging conditions, such as with reflective liquids.
 

Extreme Ambient Conditions

Challenge: Extreme ambient conditions can directly influence the measured values of the sensors, as temperature fluctuations contract and expand the housing material. This changes the optical components, which influences the measured values. 

Solution: 

Ambient Temperature up to 250 °C

Challenge: In extremely hot environments of up to 250 °C, conventional sensors may melt or be damaged by the high temperatures. 

Solution:

  • The sensors for the high temperature range are distinguished by their robust and particularly heat-resistant housing design. 

  • Temperature-resistant glass fiber-optic cables are suitable for confined spaces. Signal evaluation takes place externally via the fiber-optic amplifier outside the high temperature range.

The Advantages of Blue Laser on Red Glowing Surfaces

General Information on the Light Spectrum

The light spectrum consists of different wavelengths. Each has a different color. A color can be assigned to each wave in the color spectrum. Red light differs from blue light in its wavelength and energy density.

  • Blue light has a wavelength of 380 to 500 nm and is characterized by a high energy density.

  • Red light, on the other hand, has a wavelength of 640 to 690 nm and a lower energy density than blue light.


Signal from Red and Blue Laser on Glowing Surface

Blue laser light offers the advantage of delivering reliable and precise measurement results on red glowing surfaces. This is because a sensor with blue laser light only allows blue wavelengths through its bandpass filter, while other spectral ranges are blocked. This filters out the red and infrared light emitted mainly by glowing objects. Only the blue laser light from the sensor reaches the optics and generates a stable signal on the line.

In contrast, the bandpass filter of a sensor with red laser naturally lets red light through to capture the sensor’s own laser light. However, since red and infrared light are spectrally close together and the bandpass filter always allows a small wavelength range, infrared light can also pass through the bandpass filter. Since glowing objects mainly emit red and infrared radiation, these disturbing wavelengths also reach the line. This leads to a significant reduction in the sensor signal. As the blue laser blocks the interfering waves, a more stable and accurate measurement is possible.


 

Industries with High Temperatures and Glowing Objects

Fill-Level Measurement with Liquid Aluminum

Challenge:
Casting aluminum bars is a central process in the casting industry. The fill level of the liquid aluminum, which reaches a temperature of 700 °C, must be monitored. However, the extreme heat creates a reflective surface that can strongly reflect light rays and influence the measurement.

Solution: 

Coarse Wire Measurement in Steel Mills

Challenge:
During the production of coarse wire in steelworks, billets up to 1,200 °C must be rolled and then checked for geometric quality characteristics such as diameter, ovality, rolling or surface defects.

Solution: 



Positioning Hot Slabs

Challenge:
During initial rolling operations, slabs must be correctly positioned for quality control to ensure that slabs are processed evenly. Due to the extremely high temperatures of the slabs, it is necessary to measure from a long distance.

Solution: 

Thickness Measurement with Annealed Metal

Challenge: 
Thickness measurement of annealed metal plays a crucial role in industrial processes such as metal or steel production. The extremely high temperatures present a challenge as they could damage conventional sensors due to the heat or affect their accuracy. Due to the glowing surface, red laser light penetrates deep into the surface and can make measurements unreliable.

Solution: 




 

Bottle Detection in Hot Areas

Challenge:
In industrial processes such as glass or beverage production, bottles must be reliably detected even in areas with high temperatures.

Solution: 

Presence and Position Monitoring of Body Parts

Challenge:
In manufacturing processes that take place in hot environments, reliable detection of components is a special requirement. The high temperatures can stress sensors, while reflective metal surfaces make precise detection even more difficult.

Solution: 




 

Detection of Skid Position in Drying Ovens at Extreme Temperatures

Challenge:
In industrial drying ovens, skids that serve as carriers for workpieces must be precisely positioned to ensure a smooth flow. This application presents a particular challenge, as the furnaces have temperatures of several hundred degrees Celsius.

Solution:

Contactless Temperature Measurement

Challenge:
When producing bricks for houses, it must be ensured that the clay column has a constant temperature of 40 °C before cutting and burning. For this purpose, a temperature sensor for contactless measurement is installed on the side of the conveyor. Thanks to two adjustable switching outputs, target/actual value comparisons can be carried out with the sensor.

Solution: 
 

Temperature Measurement of Roasted Almonds

Challenge:
Precise temperature control is essential during the roasting process, as temperature fluctuations can significantly affect the consistency and taste of caramelized almonds.

Solution: 

Overview of Solutions

Laser Distance Sensors Time of Flight in 316L Housing

Laser Distance Sensors Time of Flight in 316L Housing

The time-of-flight laser distance sensors function in accordance with the time-of-flight measurement principle with laser class 1. The wintec sensor also works very reliably in adverse ambient conditions, such as those caused by ambient light or contamination. The robust stainless steel housing (1.4404/316L) is resistant to oils, coolants and cleaning agents.

Inductive Sensors for Extreme Temperature Ranges

Inductive Sensors for Extreme Temperature Ranges

These inductive sensors detect contactlessly metallic objects in extreme temperature ranges. With increased switching distances and a very robust design, the sensors are designed for a long service life of several years.

MLWL 2D/3D Profile Sensors

MLWL 2D/3D Profile Sensors

The sensors from the MLWL series are available in three different laser classes and two laser colors and are characterized by very high resistance to ambient light. They are suitable for reliable measurement in small measurement volumes and for profile measurements at greater distances.

Laser Distance Sensors Triangulation

Laser Distance Sensors Triangulation

These laser distance sensors work with a fine blue light beam and a high-resolution CMOS line. They determine the distance between the sensor and the object by means of the triangulation principle. Thanks to the integrated TripleA technology, the sensors offer high precision, temperature stability and material independence. The blue laser light enables enhanced performance on challenging surfaces. 






 

Glass Fiber-Optic Cables

Glass Fiber-Optic Cables

Thanks to their flexibility, glass fiber-optic cables can be easily integrated even in confined spaces. With their high transmission efficiency, they enable precise measurements over long distances. Glass fiber-optic cables are an ideal solution in high temperatures or in aggressive ambient conditions in particular.

MLSL 2D/3D Profile Sensors

MLSL 2D/3D Profile Sensors

The compact MLSL 2D/3D profile sensors offer maximum capabilities in the tightest spaces as well as good resolution with height profiles of 1,280 points per profile and a detection rate of up to 4 kHz. They are available in three different laser classes and two laser colors and are characterized by high resistance to external light. 

Temperature Sensors

Temperature Sensors

Sensors of this type measure the temperature of objects contactlessly using infrared radiation – regardless of material, size and state of aggregation. Two switching outputs and an analog output enable the comparison of target/actual values as well as absolute measurements.


 

Sensors

Product Advantages of sensors  Product links
P3 laser distance sensors triangulation
  • Blue laser for red glowing surfaces
  • Robust aluminum housing for harsh environments
  • Hybrid glass protects the optics
  • Temperature drift of up to 2.5 µm/K

  • Suitable for use in a temperature range from –30 to +60 °C
Protective screen (3P)
  • Scratch-resistant lens cover
  • For 50 × 50 × 20 mm (3P)
  • Protection against weld spatter and sparks
Laser distance sensors time of flight
  • Variant with robust stainless steel housing 
  • High resistance to ambient light
  • Robust in temperatures from −40 to +50 °C
Protective housing (1P)
  • Stainless steel housing
  • For 50 × 50 × 20 mm (1P)
  • Protective housing for harsh environments

Inductive sensors for extreme temperature ranges
  • Long service life up to 100,000 hours
  • Configurable switching distances up to 40 mm
  • Temperature-resistant in the temperature range –10 to +250 °C
Glass fiber-optic cable
  • Applications with limited space availability
  • High transfer efficiency
  • Temperature ranges from –25 to +180 °C
Temperature sensors
  • Contactless temperature measurement using infrared radiation
  • Temperature measurements from –25 to +350 °C 
Product
P3 laser distance sensors triangulation
Protective screen (3P)
Laser distance sensors time of flight
Protective housing (1P)

Inductive sensors for extreme temperature ranges
Glass fiber-optic cable
Temperature sensors
Advantages of sensors 
  • Blue laser for red glowing surfaces
  • Robust aluminum housing for harsh environments
  • Hybrid glass protects the optics
  • Temperature drift of up to 2.5 µm/K

  • Suitable for use in a temperature range from –30 to +60 °C
  • Scratch-resistant lens cover
  • For 50 × 50 × 20 mm (3P)
  • Protection against weld spatter and sparks
  • Variant with robust stainless steel housing 
  • High resistance to ambient light
  • Robust in temperatures from −40 to +50 °C
  • Stainless steel housing
  • For 50 × 50 × 20 mm (1P)
  • Protective housing for harsh environments
  • Long service life up to 100,000 hours
  • Configurable switching distances up to 40 mm
  • Temperature-resistant in the temperature range –10 to +250 °C
  • Applications with limited space availability
  • High transfer efficiency
  • Temperature ranges from –25 to +180 °C
  • Contactless temperature measurement using infrared radiation
  • Temperature measurements from –25 to +350 °C 
Product links

Machine Vision

Product Benefits of machine vision  Product links
MLWL 2D/3D profile sensors
  • Precise resolution of the measuring range X (> 2,000 measuring points)
  • Creating 2D elevation profiles and 3D point clouds
  • Blue light for applications on metal, organic or semi-transparent materials
MLSL 2D/3D profile sensors
  • Creating 2D elevation profiles and 3D point clouds
  • Compact, lightweight design – even suitable for robot applications
  • Available with laser class 3
  • Integrated data evaluation and transfer
Protective screens 
  • Scratch-resistant lens cover
  • Protection against weld spatter and sparks
Cooling units 
  • Cooling of the sensor by water or air
  • Cooling and heating operation possible
Protective housing
  • Protection against the effects of industrial environments
  • High degree of protection
Product
MLWL 2D/3D profile sensors
MLSL 2D/3D profile sensors
Protective screens 
Cooling units 
Protective housing
Benefits of machine vision 
  • Precise resolution of the measuring range X (> 2,000 measuring points)
  • Creating 2D elevation profiles and 3D point clouds
  • Blue light for applications on metal, organic or semi-transparent materials
  • Creating 2D elevation profiles and 3D point clouds
  • Compact, lightweight design – even suitable for robot applications
  • Available with laser class 3
  • Integrated data evaluation and transfer
  • Scratch-resistant lens cover
  • Protection against weld spatter and sparks
  • Cooling of the sensor by water or air
  • Cooling and heating operation possible
  • Protection against the effects of industrial environments
  • High degree of protection
Product links

Product Flyer for High Temperatures and Glowing Objects

P3 Series Product Flyer
P3 Series Product Flyer (2 MB)

This document provides an overview of the P3 series laser distance sensors.

der wintec. Brochure
der wintec. Brochure (1 MB)

This document contains the brochure on long-range laser distance sensors with wintec (wenglor interference-free technology).

weCat3D 2D/3D Profile Sensors Product Flyer
weCat3D 2D/3D Profile Sensors Product Flyer (3 MB)
This document contains the flyer for 2D/3D profile sensors.
Inductive Sensors for Extreme Temperature Ranges Product Flyer
Inductive Sensors for Extreme Temperature Ranges Product Flyer (9 MB)

This document contains the product flyer for the inductive sensors for extreme temperature ranges.

P1XD Product Flyer
P1XD Product Flyer (902 KB)

This document provides an overview of the P1XD series fiber-optic amplifiers.

Contact

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Product Comparison
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