Self Contained IR Pyrometer - Metis Series - MP25
/Pyrometer Series Metis MP utilizes lead sulphide and Metis MB lead selenide detectors with filtered spectral response at relative short infrared wavelengths, and they are therefore often used to measure metal surfaces above 75°C (Metis MP) or above 50° (Metis MB).
The emissivity of these surfaces decreases with an increase wavelength, so they offer much better performance than other pyrometers with similar low zero scale temperatures, but with longer wavelength response.
Other major advantages are the lower sensitivity for changes in emissivity at shorter wavelengths, the small spot sizes, the fast response time and the digital signal processing which allow the pyrometer to operate within very wide temperature ranges.
This makes these units preferable for many other applications, too. Optical and electronic parts are housed in a rugged IP65, extruded aluminum casting to operate in harsh industrial environments.
Metis Series - Self Contained IR Pyrometer - MP25
Product Information
Pyrometer Series Metis MP utilizes lead sulphide and Metis MB lead selenide detectors with filtered spectral response at relative short infrared wavelengths, and they are therefore often used to measure metal surfaces above 75°C (Metis MP) or above 50° (Metis MB). The emissivity of these surfaces decreases with an increase wavelength, so they offer much better performance than other pyrometers with similar low zero scale temperatures, but with longer wavelength response.
Other major advantages are the lower sensitivity for changes in emissivity at shorter wavelengths, the small spot sizes, the fast response time and the digital signal processing which allow the pyrometer to operate within very wide temperature ranges. This makes these units preferable for many other applications, too. Optical and electronic parts are housed in a rugged IP65, extruded aluminum casting to operate in harsh industrial environments.
Lenses
The infrared energy radiated by the target is centered via focusable (Metis MP) or fixed focus lenses (Metis MB) directly on the detector. The focusing feature gives you control of the cone of vision and offers the possibility to measure either a small spot (focused) or the average of a bigger spot (out of focus). Fixed focus lenses with larger diameter collect more infrared energy and therefore result in smaller spot sizes.
The lenses are made of quartz glass (Metis MP23 and MP25) or calcium fluoride CaF2 (Metis MB) which are highly transparent in their spectral regions. If additional windows are necessary, they must offer similar optical characteristics.
The detector is sensitive to infrared radiation in an area called the cone of vision. For full scale temperatures up to 700°C the cone of vision diameter in front of the lens is about 16 mm and about 9 mm for full scale temperatures above. This area has to be kept free from any intervening objects. The spot size diameter for distances not given in the chart can be calculated by interpolation.
Optical Alignment
Metis MB and MP Pyrometers are available with 2 different solutions for aiming the sensor onto the target. The first and most popular method is the built-in laser pointer which is also helpful for focusing. The second is a sight-through optics version with reticle-defined target which is advantageous for applications where aiming onto hot, incandescent targets is needed.
Temperature Output Signals
Metis Pyrometers offer a variety of analog and digital output signals for displaying, recording, archiving and controlling of measured process temperatures. The isolated analog output is switchable from 0 to 4 to 20 mA. Zero- and full-scale temperatures are adjustable to cover any portion of the instrument’s available temperature span to a minimum of 50°C. There is a choice of 2 digital communication interfaces: RS 232 or RS 485 max. 57.6 kBd.
PID Control
The pyrometer can be equipped with PID control output signal instead of the analog temperature output signal 0 – or 4 – 20 mA. The control features and functions can be operated manually by PC or automatically by digital commands. The self-optimizing feature automatically determines the P, I and D control parameters. If PID option is chosen, the temperature information will be available from the pyrometer only via digital interface.
Signal Filtering
For measuring and holding of the highest instantaneous temperature value a peak picker (maximum value storage) is installed to compensate interruptions or attenuations in radiation caused by bursts of steam, smoke or dust. It can be reset either automatically or manually by an external contact closure or periodically by user preset clear time. In this last case the highest temperature will be held in a dual storage and will be reset in only one of the two storages after preset clear time to avoid a decrease of the temperature output, should a short cold period appear just at the reset moment.
The exposition time is the length of time it takes for the output signal to reach 90% of a step change in measured temperature. It can be used to filter out rapid variations in temperature and achieve a “more quiet” signal for control or display purposes.
Software
The PSCWin Software is available for automatic or manual set up of the pyrometer, for recording and for storing of graphical or table files. At the same time these files can be used for quality assurance purposes because the parameter settings are recorded, too. Minimum computer requirements are: 500 MHz clock frequency and Windows 95, 98, ME or XP operating system.
