Instrumentation
short rotary kilns used to incinerate chemical waste that rotate at extremely slow speeds. To increase combustion efficiency, such kilns rotate at very
slow speeds - typically 4-6 revs/h. Over time, the refractory brick protecting the kiln wall will degrade and need to be replaced. There is also the possibility that a single brick could fall, leading to a hotspot on the kiln shell and causing catastrophic failure. Taking action too soon will negatively impact productivity, while waiting too long may put a high cost capital asset at risk. The customer selected a Raytek CS210 system that is
able to synchronise thermal imaging at speeds as low as two revs/h. In addition, these kilns are typically quite short, 10-15 m in length. The CS210 is specifically designed to detect each potential refractory loss across the shell lengths by providing a gapless sampling of pixels. A second Raytek customer wanted to monitor and control
polycarbonate film thickness by controlling the pressure and temperature of chrome rolls it used to extrude polycarbonate sold to the electronics and high grade plastics industries. The difficulty was that the customer wanted to measure the temperature of the chrome roll, which was very shiny - making accurate IR measurement difficult to achieve. After discussions, it was determined that the polycarbonate
product temperature could be measured with a Raytek ES150 process imaging system. The output from the ES150 could be used as feedback to control the pressure of the chrome rollers, which is what the customer was ultimately trying to achieve. Today the customer is using the scanner in a monitoring
mode and is looking at temperature profiles, since the proper amount of pressure is correlated with temperature in the heated chrome roll. If a temperature deviation of 5-8°C occurs, adjustments are made to chrome roll pressure parameters to influence the process.
Why IR? Omega points to common questions that should be asked when thinking about using a thermal imager. Firstly is, “Why?” Omega says that thermal imaging is ideal where there are moving objects, or where non-contact measurements are required because of contamination or hazards such as high voltage and high temperature.
Resolution is an important consideration, too. Thermal cameras can pick up small problems at greater distances than other measurement techniques. Then there are a number of critical considerations to be
made regarding how the thermal imager will be used. These include: field of view (target size and distance); type of surface being measured (emissivity considerations); spectral response (for atmospheric effects or transmission through surfaces); and temperature range and mounting (handheld portable or fixed mount). Other considerations include response time, environment, mounting limitations, viewing port or window applications, and desired signal processing. Once these issues have been resolved, it’s time to find the
most suitable thermal imager for a particular application. Omega recommends buying an IR camera with the highest detector resolution/image quality that the budget allows. When it comes to the food industry, monitoring of
temperatures is among the most important measuring tasks. To ensure constant process quality, the temperature sensors used have to be regularly calibrated. This is time-consuming and expensive. In order to overcome this, IFM uses its TAD temperature
sensors. These use two different sensor elements which monitor each other during the process. So any occurring drift is reliably detected. Furthermore, if one element fails, the process can be continued with the second measuring element acting as a backup function. For customers, the two high-precision and long-term
stable measuring elements of the TAD temperature sensor ensure reliability and quality in the process. The temperature- proportional 4-20mA signal enables processing via all common controllers. To ensure easy further processing the signal for the relevant temperature range is scalable. The diagnostic output warns in the event of ‘drift warning
threshold reached’ and ‘drift alarm threshold reached’. IFM warrants a reliable drift detection within the preset drift thresholds for a period of five years. The integrated ASEPTOFLEX adapter thread enables
hygienic fitting to all common process adapters. The completely sealed housing guarantees protection rating IP 69 K. The selected design reduces build-up of dirt and can easily be cleaned all around. ■
Global instrumentation co-operation Y
okogawa Electric Corporation and SICK have signed an agreement whereby Yokogawa will distribute and service SICK process analytical instrumentation on a global scale.
Three years ago both companies announced the establishment of a distribution agreement targeted for the European process analytical markets as the product portfolios of both companies are, to a large extent, complementary. With this new agreement both companies confirm this successful strategy and widen it to a global scale.
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Seizo Nakamura, business development manager for the analytical products business division at Yokogawa, stated that the collaboration between the two companies has been well received by the customers in the field of process analytical instrumentation and has significantly improved the ability of Yokogawa to provide turnkey process and environmental automation solutions for process industries from a single supplier.
In addition, Michael Markus, head of marketing and sales of SICK’s analyser division, pointed out that the collaboration with Yokogawa
has allowed SICK to broaden its market position as a solution provider in process analytics. This is accomplished by the addition of SICK’s analytical product offering to Yokogawa’s specific process analytical applications and system integration know-how to provide a total solution. The next step in the global distribution agreement has seen Norbert Zeug, formerly staff member of Yokogawa in Europe and since March 2012 in charge as strategic industry manager chemical and hydrocarbon process industries at SICK, being nominated as the liaison manager of co-operation between the two companies. ■
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