WORLD OF TEST ROUND UP 


❱❱ Non-contact pyrometer benefits from higher range of temperature sensing capability


PYROMETER SUITABLE FOR INDUSTRIAL PROCESSES


Micro-Epsilon has extended its range of high performance, non- contact temperature sensors to include a new compact infrared ratio temperature sensor (two- colour ratio pyrometer) suitable for use in high-temperature, high-speed metal processing environments, including casting, forging and secondary metal processing applications such as induction heating. The thermoMETER CTRatio


series has been extended to include two new updated versions, the CTRatioM1 and CTRatioM2. These two-colour ratio infrared temperature sensors offer users a much wider temperature measuring range, from 250°C up to 3,000°C. Response times have also


been improved, from 5ms down to 1ms. Fast signal processing means the sensors are suitable for use in high-speed processes. Due to their rugged sensor heads, the thermometers can operate in ambient temperatures up to 200°C without additional cooling. The compact sensor head of


the ratio pyrometer enables it to be mounted in restricted spaces on production lines and in


machines. In addition, the sensor is equipped with a green laser for sighting purposes, especially useful on red glowing surfaces. A fibre optic cable connects the optical sensor head to the electronics. By using a fibre optic cable, the device is insensitive to electromagnetic interference (EMI) normally found in induction-based heat treatment processes. The sensor is also insensitive


to dust, dirt, smoke fumes and steam. Using the ratiometric measuring principle, the sensor minimises measurement errors caused by unknown emissivity values and partial spot size coverage. Even when infrared radiation from the target surface is weakened to 95 per cent original intensity due to smoke, steam or a dirty viewing window, the ratio pyrometer still provides reliable measurements. With optical resolutions of 38:1,


50:1 and 100:1 and an adjustable focus from 300mm to infinity, thermoMETER CTRatio uses a short wavelength range of 0.8 to 1.75µm and can measure high temperatures on metals and monitor fast-moving, high-speed production processes.


development and testing work on springs that would have to work in an environment of about 200-250°C with high demands for strength and relaxation resistance. Springs working in high temperatures are usually made


from stainless steel or super alloys, such as Inconel or Nimonic. However, these materials are very costly compared with tool steel and the strength is fairly low in larger dimensions. Apart from temperature, tool steel had other advantages. Lesjöfors manufactured 10


springs in tool steel, each weighing about 10kg and hardened to 50 Rockwell C. The spring heat resistance was tested using a setting test to solid length at temperatures between 200°C and 300°C to measure how well the springs’ characteristics withstood high temperatures. The tests proved positive and the company is now


❱❱ Compression spring testing evaluates effects of using standard tool steel in high temperature applications


continuing its evaluations to obtain exactly the right steel for springs working in high temperature environments.


AFFORDABLE OPEN SOURCE TEST PLATFORM STEMlab from Red Pitaya is a test and measurement


environment designed to provide a low-cost alternative to many expensive measurement and control instruments while improving performance. STEMlab 250-12 offers enhanced hardware performance,


complete software control and additional hardware features over the STEMlab-125 and is designed to meet the needs of more demanding users for industrial, research, test and measurement and data acquisition applications. Its larger FPGA enables


greater real-time processing capabilities as well as faster analogue front- and back-end performance. The new STEMlab 250-12 is a


two-channel 250Msps 12-bit signal acquisition and two- channel 25 Msps 14-bit signal generator module with Zynq 7020 dual-core ARM cortex-A9 CPU and FPGA, 1GB DDR memory and 1GB Ethernet connectivity. According to Red Pitaya, the STEMlab 250-12 builds on the


❱❱ STEMlab offers affordable test instrumentation and DAQ capabilities to a wider audience


existing open-source STEMlab range by offering high- performance signal capture and analysis with remote access at an affordable price. It can be used as an oscilloscope, spectrum analyser and


logic analyser, with more applications to be released in future. It extends the Red Pitaya user community to include more demanding users, who can then use it as an alternative to individual, expensive dedicated instruments.


April 2020 /// Testing & Test Houses /// 7


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