TECHNOLOGY IN ACTION Minimum effort, maximum safety


Wieland Electric presents the latest generation of highly efficient safety light grids and safety light curtains The importance of occupational safety grows in modern industrial and logistical environments as machines and systems become more complicated. Against this backdrop, Wieland Electric introduces its next generation of safety light curtains and safety light grids, which complement the existing array of optoelectronic protection devices and are distinguished by a high level of safety, flexibility, and use. The new SLG4 series safety light grids were designed for applications requiring dependable access protection over wide areas on machines or in production sites. While withstanding temperatures as high as 70°C, the light grids may be put into action swiftly thanks to their simple software configuration and plug-and-play installation. Clearly visible LEDs also enable immediate on-site diagnostics, reducing downtimes. Furthermore, the durable aluminium housing and protection rating IP65/67 in accordance with EN 60529 ensure that the optoelectronic protective devices perform reliably even in adverse environmental situations.


Wieland Electric Ltd. 01483 531213 www.wieland.co.uk


Best practice for high limit safety sensors


Best practice for high limit safety sensors


Electrical heating systems have several safety features built in to prevent dangerous situations. High-limit sensors, or safety sensors, are one of the most important. Not only do they protect people, they help keep manufacturing lines running by limiting damage to equipment and product. In this article, Jeremy Ohse at industrial heater, temperature sensor, and controller manufacturer, Watlow, explores best practice and considerations for high-limit safety sensors.


Understanding safety sensors Thermal loops consist of a heater, temperature sensor, and heater controller. The controller has a temperature setpoint, receives a signal from the temperature sensor, and modulates power to the heater to maintain the temperature setpoint. If there is a failure in the primary thermal control loop, the redundant safety sensor can tell


Energy saving solutions with Hörmann Docking Before Opening


With energy costs continuing to have a significant impact on UK business, the Hörmann Docking Before Opening system (DOBO) provides an energy saving solution for loading bay operations. The DOBO system has been designed to allow lorries to dock on a loading bay before their rear doors are opened, significantly reducing heat loss through the bay doors together with providing increased security and improved safety.


Vehicles are guided into position on the loading bay by the Hörmann docking assistance system which operates via sensors in the loading bay door linked to traffic lights. Green directs the driver to reverse onto the bay, amber indicates when the lorry is nearly in position and red is for the optimum position for docking. Safety is improved by removing the need for the driver to get out of the cab to open the doors before reversing onto the bay.


Once the lorry is in place an inflatable dock seal surrounds the vehicle on three sides creating


an effective barrier against the external environment. The vehicle is now docked with both the loading bay door and the truck doors still closed.


With the Hörmann DOBO system the loading door sits in a recess in front of the dock leveller and behind the dock buffers. When the loading door is opened the specially designed dock buffers can then be positioned below the lower level of the vehicle doors. This allows the doors to be unlocked and opened into the recess in the loading bay area.


Hörmann 01530 516868 hormann.co.uk


the controller to reduce power to the heater or shut down the entire system. The most common failures are physically damaged sensors, worn out components, and pinched wires. In an application away from industry, a hot tub uses a high-limit sensor to prevent the water from getting too hot. If the primary control loop fails, the heater will continue to heat the water. When the water temperature reaches a certain level, usually between 110 and 120 °F, the high- limit sensor disables the heater to keep the water at a safe, enjoyable temperature. To provide additional safety, when the high-limit sensor trips the system, users are “latched out” until the system is inspected and reset by an operator, system designer, or manufacturing engineer.


Watlow https://www.watlow.com/


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Explaining Mixer Pumping Capacity


The latest animation to be released in Silverson Machines ‘Silverson Mixing Science’ series explains the pumping capacity of high shear In-Line mixers. When mixing continuously in larger batches, In-Line mixing is often the method chosen by manufacturers to get the best results; it also offers greater energy efficiency over in-tank mixers as the mixer’s effort is concentrated on a


small volume in the mixing chamber rather than having to circulate the entire volume in the tank. But, although Silverson In-Line mixers are self-pumping, some people think that they will need a very powerful machine to recirculate the product back to the top of a large tank. The new animation debunks this by explaining how a Silverson In-Line mixer can recirculate product in a large tank without the need for pumps or additional power.


Silverson Machines www.silverson.co.uk


FACTORY&HANDLINGSOLUTIONS | JUNE 2024 45


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