New multi-functional CellaTemp PA pyrometer from Keller HCW

The physical principles of non-contact temperature measurement were set out by Max Planck back in 1900. In the meantime the development of pyrometers for temperature measurement has reached a very high technical level. Nevertheless, there remains room for improvement as the new CellaTemp PA series of instruments from Keller HCW has shown.

A pyrometer consists of the following basic modules: optics, signal recording, signal processing, handling and measured value output. With development of the new CellaTemp PA pyrometer, improvements have been achieved in all these areas.

 

Modular structure

In the development of the CellaTemp PA, the core concept was the modular structure of the functional components and the multiple combination possibilities. Up to now, pyrometers have been manufactured with fixed functional structures. With the new CellaTemp PA, the operator can use various configuration possibilities to adjust the device to the required application.

The CellaTemp PA is provided with two analogue outputs. The measured variables of the outputs can be defined by the operator himself. For example, parallel to the temperature of the measured object, the inside temperature of the device can also be indicated. Alternatively, one output can be configured as an input in order to analyse the kiln temperature as a correction value. Furthermore, two switching outputs can be combined with the measured values in several ways or can be used as switching inputs.

 

Various new ­configuration parameters

In addition to the standard parameters such as scaling of measurement range, smoothing function or emission level, the CellaTemp PA is equipped with various new configuration parameters so that an individual correction curve can be entered. If, e.g. the emission behaviour of the measured object changes with the temperature, the measured value is dynamically adjusted. Furthermore, the transmission factor of protective glasses or the compensation of background radiation can be adjusted and is taken into account in the evaluation of the temperature. A new function is the automatic recording of measured values in intermittent processes. With this function, automatic measurement of the temperature of liquid iron in automatic casting devices is possible for each cast.

Another special feature is the determination of an output signal correlating to the emission level. In belt coating plants the flow rate can be adjusted depending on the heat absorption capacity.

Moreover, further optimizations were achieved in the separate functional modules. With the introduction of cemented lens systems, the optical imaging features have been improved. Because of this, the measurement inaccuracy as a function of distance (Size of Source Effect) is halved.

With more sensitive sensors, extremely low-noise amplifiers and a 21-bit signal transformation, the CellaTemp PA reaches an inner resolution of 0.01 K. At the same time, measuring voltages of up to 2 000° C are possible. The measuring ranges of 0 to 3 000° C are covered by three basic components.

Five interchangeable objectives are available, depending on the measuring distance and the object size. These objectives can be adjusted continually and precisely to distances between a few millimetres and several metres. Even the smallest object from 0.3 mm can be measured. The new multi-functional CellaTemp PA pyrometers are available with through-the-lens sighting for marking the measuring spot or alternatively with a laser.

The large key panel with LED display is very easy to use. The measured values can be easily read, even from large distances away, i.e. several metres away. All configuration parameters can be adjusted directly on the pyrometer keyboard. Alternatively, thanks to the USB interface, the CellaTemp PA can be configured on a personal computer. The software for parameterization and measured value outputs have already been integrated in the pyrometer. Therefore the CellaTemp PA is able to communicate with all established Windows operating systems, irrespective of the language. At the same time, a network-compatible RS 485 interface is available.

With the development of CellaTemp PA, Keller HCW GmbH, the well-known manufacturer of non-contact temperature measurement devices, has once again achieved considerable technological progress.

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