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Flow, level & control


display of the tanks levels was met with E30391 IO link display modules which also connect directly to an IO-Link master port on the AL1121 and, like the Ethernet interface modules, require no additional protection when mounted in the field. In most applications, the sensors would have been installed on top of the tanks, but in this case, space above the tanks was limited and access was difficult. The decision was therefore taken to mount the sensors in the pipes that supply the top pressure to the tanks. In this location, the sensors provide identical data, but installation was much faster, easier and safer as no scaffolding was needed. Despite the exceptionally high reliability of


compatible with the hygienic requirements of the food and beverage industry, engineers from ifm electronic proposed that each tank should be fitted with two flush-fitting hygienic PI2796 pressure sensors with integral displays and one LMT100 hygienic level sensor. These sensors incorporate IO-Link interfaces, meaning that digital process values are transmitted, which greatly simplified interfacing them with the existing plant systems, and also ensured that the data they captured would always be transmitted accurately. The plant systems use an Ethernet network with redundant ring topology to ensure high reliability. The ifm IO-Link sensors were connected to this via AL1121 Ethernet interface modules which, with their IP65 rating, are suitable for installation in the field without additional protection. The requirement for local


Instrumentation Monthly October 2020


modern sensors, the engineering team at Marston’s wanted to be sure that, should it ever prove necessary, they would be easy to replace. This requirement was satisfied not only by installing the sensors at a convenient working height, but also by an intrinsic feature of the IO- Link system which allows configuration data to be directly loaded into the sensors. If a sensor needs to be replaced, all that is


necessary is to send the configuration data to the replacement via its normal IO-Link connection and it is then ready for immediate use. The need for inconvenient and time- consuming manual setting up is completely eliminated, which helps to ensure that plant downtime is kept to a minimum. The new sensors were installed and commissioned in just four days compared with the six days that had been allocated for the work and, as an added bonus, the overall cost was also under budget. The new level monitoring and control system based on ifm electronic sensors with IO-Link technology has operated faultlessly since it was commissioned. It has received an enthusiastic reception from both the plant operators and managers as it makes their lives significantly easier. In fact, so successful has the upgrade at Burton-on-Trent been, that the possibility of rolling out similar solutions to other plants in the Marston’s Brewery group is now under active consideration.


ifm electronic www.ifm.com/gb/en


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