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HAZARDOUS AREA EQUIPMENT SUPPLEMENT FEATURE


A WORLD OF FEATURES IN A COMPACT HOUSING T


he issue of functional safety has grown in importance in recent years


as plant operators have gained a greater understanding of safety in their applications. Turck has consequently strived to meet the resulting challenges with the development of a new generation of interface technology, the IMX series. The development of the IMX series was carried out in complete compliance with the requirements of IEC 61508. Recognised independent bodies have certified this process.


MINIMUM SPACE REQUIREMENTS In the past Turck’s MK series required almost three centimetres in width in order to process one temperature signal, the current IM series requires 18 millimetres for the same task. The new IMX series now only requires 6.25 millimetres per temperature signal. Thanks to the narrow 12.5 millimetre housing width, and up to four terminal banks per side, these devices are said to achieve unrivalled channel density.


A study of the development of interface technology reveals that customers have three key requirements: safety, space and performance. Although existing interface devices can meet these requirements, the possibility of their development can be limited


The devices can be used in a 10 to 30 VDC range. This opens up the possibility of use in new applications that are supplied from batteries, solar collectors or small wind turbines


With the new IMX series the space requirement on the DIN rail for the isolating switching amplifiers with a relay output (two-channel four-wire resistance temperature sensors) has been reduced to half of that required by the IM series. Four separate removable terminal banks facilitate ease of connection as only the used terminals need to be unplugged.


MAXIMUM ACCURACY Turck has managed to increase both the accuracy and speed of the new series in


spite of the narrow mounting width. This is highlighted particularly by the IMX12- AI EX analogue signal isolator. The new electronic design makes it considerably less sensitive to external factors such as temperature or voltage fluctuations. The effect of the interface device on the overall performance of a complete measuring circuit is thus considerably reduced. However, the linearity error of the devices is not the only factor to consider in regard to accuracy. Other error factors, which often only appear in the small print of the manufacturers’ data sheets, should not be ignored. Data sheets cannot be used as the sole basis of device comparisons. Ambient influences such as temperature, power supply fluctuations or changes in the connected load can have a considerable effect on the performance of devices. Turck recognises these errors and field conditions, and includes effects such as repeatability and hysteresis in the total error calculation. Thus the total performance is calculated from this together with the temperature coefficient. Quoted figures therefore reflect performance in the field and not abstract laboratory conditions. The IMX12-DI isolating switching amplifier offers maximum processing


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speed. Input frequencies up to 15,000Hz, which were previously only possible with special frequency transducers, can be processed allowing precise measurement without the negative effect of signal conversion.


GLOBAL APPROVAL PORTFOLIO Ex approvals can present a challenge, particularly when the same device is required for use in different countries. Unfortunately, Ex approval is not as uniformly harmonised worldwide as it is in Europe, where the ATEX directive is applicable in all countries. Different continents have different standards. The challenge for all device manufacturers is to cover the different requirements of all relevant Ex approvals combined, preferably in one device. Turck has successfully managed to do this with the IMX series. The devices have been comprehensively approved for Europe, North America, South America, China and Asia and are provided with UL, FM, ATEX, Nepsi, Kosha, Imetro and IEC-Ex certification. The global approval portfolio enables the customer to operate the devices reliably at locations worldwide.


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ELECTRICAL ENGINEERING | APRIL 2016 S11


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