INSTRUMENTATION,
INSTRUMENTATION, CONTROL, AUTOMATION Automated retractable sensor housing with cleaning control system High potential for optimised pH measurement A well-designed, automatic rinse control system in combination with the proper retractable sensor housing can improve the availability, lifetime and precision of pH measuring points in hard processes. At the same time, maintenance requirements are reduced. There is no quicker way to cut down processing costs. When handling liquids in production proc esses, plant operators almost inevitably have to perform pH measurements to control the process. Such measurements are performed manually and this can lead to a multitude of problems. The use of retractable sensor housings offers potential for immediate optimisation as they allow significant improvements in the availability, lifetime and precision of pH measuring points. The Exmatic 460 is an electro-pneumatic control module for controlling retractable sensor housings in the Extract series with an integrated connection hose for plugand-play operation A maintenance-intensive parameter In the simplest case, measurements are performed in the laboratory via sampling. Most process control systems use online measurements in order to obtain reliable pH values at any time, enabling control and optimisation of the processes. Unfortunately, pH measurement is still a very maintenance-intensive parameter, requiring rather frequent cleaning and adjustment procedures, despite the availability of state-of-the-art analysis technology and digital sensors. Virtually all operators have become used to these time-consuming maintenance tasks, and often they are not aware that there is a much easier and safer option. As a rule, pH glass sensors will only supply reliable values if they are regularly maintained. That is a fact, even if the most sophisticated amplifier technology is at hand. The better such a sensor is maintained, the longer its lifetime and the more accurate the pH values it will deliver. This becomes very apparent in most laboratory measurements. In a laboratory, the sensor is immersed in the measured medium only briefly before the value is recorded. The sensor is then rinsed and placed in distilled water or KCl solution for storage. This allows sensor lifetimes that can only be The pneumatic retractable sensor housings in the Extract series allow operators to automatically separate the pH sensor from the process for cleaning or calibration, or to remove the sensor dreamt of in hard process applications where the sensor is often subjected to high temperatures under full process pressure while immersed in the medium during the entire process. Clearly, such conditions differ substantially from laboratory environments. Also, manual in-process cleaning of the sensors can only be done every few days since maintenance capacity is greatly limited due to the large number of measuring points. This is 24 cpp 1-2017
A radar beam focused like a laser! The future is 80 GHz: a new generation of radar level sensors The latest cutting-edge technology from the world leader: the unsurpassed focusing of VEGAPULS 64. This enables the radar beam to be targeted at the liquid surface with pinpoint accuracy, avoiding internal obstructions like heating coils and agitators. This new generation of level sensors is also completely unaffected by condensation or buildup and has the smallest antenna of its kind. Simply world-class! www.vega.com/radar Wireless adjustment via Bluetooth with smartphone, tablet or PC. Compatible retrofit to all plics ® sensors manufactured since 2002. cpp 1-2017 25
