Knowing the exact value of the radiation temperature is essential for the calibration process. It can be measured by either using a contact thermometer (in combination with the determination of the emissivity) or a transfer standard infrared thermometer. This value can then be used to determine the device constant for an initial calibration of the infrared sensors. In order to conduct a post-calibration by customers or local calibration facilities, the calibration temperature should be near the temperatures which occur at the respective applications.
Optris makes use of a transfer standard radiation thermometer CTlaser-PTB (see figure) to measure the radiation temperature of a reference source. The CTlaser- PTB is based on the IR thermometer optris CTlaser. The CTlaser-PTB needs to be traceable to the international temperature scale from 1990 (ITS-90). Thus, it is calibrated by the PTB (German national metrology institute) on a regular basis. ITS-90 is a very good approximation of thermodynamic temperature. It is based on 17 well-reproducible fixed values such as melting points of highly pure metals. Within the framework of ITS-90 the CTlaser-PTB is compared to national temperature standards from the PTB. This comparison within a closed chain of comparative measurements with a known uncertainty in measurement takes place on a regular basis.
Based on the CTlaser-PTB, Optris produces the CTlaser- DCI as a high-precision reference IR thermometer for its customers. The DCI units are produced with pre-selected components supporting high stability of measurement. In combination with a dedicated calibration at several calibration points the CTlaser-DCI achieves a higher accuracy than units from series production.
The optics of an IR thermometer is described by the distance-to-spot-ratio (D:S). Depending on the quality of the optics a certain amount of radiation is also received from sources outside the specified measurement spot. The maximum value here equals the radiation emitted by a hemispheric radiant source. The respective signal change in correlation with a resize of the radiation source is described by the Size-of-source effect (SSE).
As a result of this correlation all manufacturers of IR thermometers use accurately defined geometries for the calibration of their units; meaning depending on the aperture of the radiation source (A) a distance (a) between the IR thermometer and the reference source is defined. Thus, the value specified in datasheets and technical documentation as a measurement field is, in general, a certain defined percentage of this radiation maximum – values of 90 % or 95 % are common.
The quick exposure time of only 90 μs makes the high speed IR thermometer CT 4M the perfect sensor for measuring fast processes. Due to its short measuring wavelength and a temperature range from 0°C to 500 °C, the pyrometer optris CT 4M, is suitable for measurements of metals, metal oxides, ceramics or materials with unknown or changing emissivity.
The electronics box of the measuring device allows a flexible terminal device through selectable analog outputs as well as various optional digital interfaces.
The new compact infrared camera optris Xi 410 combines all the benefits of infrared cameras and infrared thermometers.
The Optris Xi 410 has a fast Ethernet interface and can be powered by PoE. This allows for a simple installation, even if the distance from the PC is large. The built-in hot spot finder function can be used to reliably measure moving objects without having to reposition the camera. If the network connection is interrupted or if the connected PC has a problem, the camera immediately switches to the autonomous stand-alone mode which ensures a continuous measurement and alarm. Thus the reliability of problem detection (typically exceeding a threshold in the context of monitoring a fire outbreak) is maintained. Thanks to this unique feature, the Optris Xi 410 is ideal for all safety applications related to fire prevention, detection of critical hot spots, monitoring of industrial equipment and storage of all kinds.
The Optris Xi 410 incorporates a motorized remote focus, controlled by the free PIX Connect software. The resolution of the camera is 384 x 240 pixels with a frame rate of 25 Hz.
The Optris PI 450i G7/ PI 640 G7 infrared cameras are the first industry-specific thermal imaging cameras in the PI series. Designed specially for the glass industry, this camera measures in only one spectral range.
The IR camera is used as a line-scan camera in the field of sheet glass production and offers various possibilities for documenting and controlling the process.
This compact, high-performance infra-red camera for the glass industry is available with interchangeable lenses and industrial accessories. The comprehensive license-free software package “Optris PIX Connect” is included in the price.
The infrared pyrometer optris CS LT is perfectly suited for temperature measurement in small and narrow environments. The robust measuring heads have been developed for use in temperature ranges from -50°C to 1,030°C and can be employed in ambient temperatures of up to 80°C without additional cooling.
The inexpensive IR pyrometers are perfectly suited for OEM solutions. They also work ideally for multiple employments of infrared measurement points.
The pyrometer optris CSmicro 3M has been designed for a temperature range from 50°C to 600°C. Its special spectral range of 2.3 µm makes it the ideal IR pyrometer for temperature measurement of metallic surfaces starting from 50°C and it allows for measurements through glass.
The small infrared measuring head is optimally suited for installation in limited spaces and subsequently makes possible an especially cost-efficient mechanical process integration.
The CSmicro series can now be operated via the new IR mobile App (Android). The App enables to monitor and analyze infrared temperature measurements on a connected smartphone or tablet.
The pyrometer optris CSmicro 2M has been designed for a temperature range from 250°C to 1,600°C. Its special spectral range of 1.6 µm makes it the ideal IR pyrometer for temperature measurements of metals.
The small infrared measuring head is perfectly suited for installation in very limited spaces and allows for an especially cost-efficient mechanical process integration.
The pyrometer optris CT LT is equipped with one of the world’s smallest infrared sensors with a high optic resolution of 22:1. Additionally, it offers a high variability due to selectable analog outputs as well as several digital interfaces in the electronics box.
The extended version, the pyrometer CTex LT, is additionally equipped with Zener double barriers (for employment in explosion-prone areas).
The pyrometer optris CTfast LT is perfectly suited for especially quick measurements ,due to its extremely short response time of 6 ms. The unchoppered sensor allows a continuous temperature surveillance of fast processes in a spectrum of -50°C up to 975°C.
The pyrometer optris CThot LT has been developed for the most extreme conditions in high-temperature areas and is acclaimed for its especially high temperature resistance. Employment of the inrared thermometer in ambient temperatures of up to 250°C without additional cooling poses absolutely no problems.
Due to the mentioned features, the IR pyrometer is especially suited for applications in driers, in tempering for metal and glass industries, in the processing of plastics and textiles, and in the semiconductor production. By request, the IR thermoemters are available in an explosion-safe design with ATEX certificate.
The infrared cameras optris PI 400i / PI 450i are the smallest thermographic cameras in their class. Being equipped with a measurement speed of 80 Hz and an optical resolution of 382 x 288 pixels they provide real-time thermographic images in high speed.
The IR camera PI 450i is, due to its thermal sensitivity of 40 mK, specifically suited for the detection of slightest temperature differences, making it indispensable in quality control of products and in medical prevention.
The compact and high-performance infrared cameras offer a temperature range of -20°C up to 900°C, being optionally upgradeable up to 1500 °C. They can be delivered with exchangeable optics, industrial thermal imager equipment and they come with an extensive license-free thermography software package.
The Series 1000 and 2000 are a range of extra large 3 to 5 digit LED array displays, 125 mm digit height, designed to be used in process / temperature / weighing applications where high visibility and distant viewing is required. Using high intensity wide angle LED's in an IP65 enamelled steel housing ensures clear viewing distances of greater than 50 metres. For high ambient temperature conditions, an optional special coated glass window is available. Typical applications include downtime, time and production control in large factories, the indication of load cell inputs / crane overload protection, process signals such as temperature, pressure, level, and AC or DC voltages and currents. For electrical specifications, input signal details, as well as the terminal connector assignments in the Extra Large Display, see the individual indicator operating manuals (e.g. Model 4001). Standard DPM indicators are used and internally fitted for the internal signal conversion for the Extra Large Displays. (Models ending in a 2)
The CALOG-TEMP, Multi-Function Temperature Calibrator is a high-precision, hand-held calibrator for the calibration and troubleshooting of process control instrumentation. The CALOG-TEMP simultaneously measures and sources ten types of thermocouples and seven resistance temperature detectors (RTD), whilst automatically capturing the calibration results. It measures milliamps whilst sourcing or simulating millivolts, TCs, RTDs or ohms to calibrate transmitters. The CALOG-TEMP logging facility stores data on the SD card supplied, which is easily downloaded to a PC via the onboard USB port and usable in most of the common spreadsheet formats. The trend feature is ideal for graphing temperature profiles and PID controller optimization with a programmable timebase. In addition, the CALOG-TEMP has the functionality necessary to install and maintain all powered and non-powered transducers using the built-in 24V loop power supply. The CALOG-TEMP is the economical choice for people wanting to do industrial field or workshop calibration.
The infrared laser thermometer optris CTlaser F2 offers a special measuring wavelength for temperature measurement of CO2 flame gases. This makes it optimally suited for e.g. combustion processes, garbage incineration, or processes in chemical reactors.
The IR thermometer’s temperature range covers temperatures from 200°C up to 1,650°C, while the stainless steel measuring head is heat-resistant up to 85°C without additional cooling. Optional cooling and protection equipment is available, ensuring exact temperature measurement even in rough surroundings.
The infrared thermometer optris CTlaser F6 is an upgraded version of the pyrometer optris CTlaser F2. It has also been designed for temperature measurement of CO flame gasses, e.g. in combustion processes, in garbage incineration, or in processes in chemical reactors.
The pyrometer measures temperatures precisely between 200°C and 1,650°C. Due to the measuring head being made of stainless steel, it is heat-resistant up to 85°C without additional cooling. Also, optional cooling and protection equipment is available, ensuring exact temperature measurement even in rough surroundings.
The infrared thermometer optris CTlaser G5 has been specifically designed for measurement of glass temperatures, especially for container glass, lightbulb production, vehicle glass production as well as in the manufacturing of solar cells. Last but not least, the IR thermometer optris CTlaser G5 allows for temperature measurement of smallest objects of 1 mm from a distance of 70 mm.
The IR thermometer optris CSlaser G5 HF offers very quick response times and is thus perfectly suited for fast processes.
The infrared thermometer optris CTlaser G7 is perfectly suited for precise temperature measurement of ultra-thin glass surfaces. It offers a broad temperature range from 100 °C up to 1200 °C and can be employed in temperatures of up to 85°C without additional cooling.
The IR thermometer for measurements of plastic foils and glass temperatures is capable of targeting smallest objects of 1.6 mm (0.06 in) in a distance of 70 mm (2.76 in). Its standardized two-wire interface additionally allows for a reliable transfer of measurement data and easy integration into a PLC.
The infrared video thermometer optris CSvideo 3M is perfectly suited for low-temperature measurement of metals and composite materials starting from 50 °C. Parallel use of the video module and the laser sight allow for an easy and exact measuring field marking even if the measuring object is located in hard-to-access areas.
The new Optris video pyrometers CTvideo 1M / 2M allow a parallel use of video and crosshair laser aiming for an optimal measuring field adjustment even in processes with limited access. It reliably measures temperatures of metals or ceramics and, due to its short measuring wavelength, reduces measuring errors of surfaces with low or unknown emissivity.