Food-grade washdown inductive sensorsfrom Swiss manufacturer Contrinex are completely compatible with the strict hygiene standards of the dairy industry, helping maximize plant utilization during round the clock production of milkbased foodstuffs.
Rated to IP68/IP69K, Contrinex stainlesssteel washdown sensors withstand both aggressive cleaning chemicals and highpressure water jets, offering highly robust solutions for the harshest operating environments.
Foodgrade sensors are available with IOLink, a standardized serial connection protocol, providing digital communication in washdown areas at no additional cost.
Cleanliness is everything in food processing facilities, and nowhere more so than in the dairy industry. A single instance of contamination during production can necessitate the destruction of multiple batches of milkbased foodstuffs or, if undetected, result in illness, disease or death among consumers of infected products. It’s no surprise that for dairyplant operators, maintaining the strictest possible hygiene standards is an absolute must.
Given the simultaneous need to maximize plant utilization, time consuming cleaning methods are highly undesirable. To avoid lengthy unproductive intervals between batches, food processing facilities commonly utilize clean in place (CIP) and highpressure washdown systems.Production equipment for washdown areas must therefore with stand both aggressive cleaning chemicals and high pressure water jets as a matter of course.
This requirement extends to the sensors used throughout these areas.The Contrinex Washdown range of food grade inductive sensors addresses these needs perfectly. Devices from both the Series 600 Classics and Series 700 Full Inox families are certified to operate continuously and reliably in harsh conditions. Rated to IP68/IP69K, they are pressure resistant up to 80 bar, corrosion resistant and ideal for use in food and beverage industries. Sensing the presence and detecting the position of equipment or materials at each stage requires sensors that are both accurate and responsive. Contrinex Wash down inductive sensors are up to the task in all respects.cleaning chemicals and highpressure water jets as a matter of course.This requirement extends to the sensors used throughout these areas.
The Contrinex Washdown range of foodgrade inductive sensors addresses these needs perfectly. Devices from both the Series 600 Classics and Series 700 Full Inox families are certified to operate continuously and reliably in harsh conditions. Rated to IP68/IP69K, they are pressureresistant up to 80 bar, corrosion resistant and ideal for use in food and beverage industries. Sensing the presence and detecting the position of equipment or materials at each stage requires sensors that are both accurate and responsive. Contrinex Washdown inductive sensors are up to the task in all respects.
With a choice of one piece M12, M18 or M30 diameter AISI 316L /V4A stainless steel bodies and sensing faces (Full Inox family) or M12diameter AISI 316L/V4A stainlesssteel body and PPS (polyphenylene sulfide) FDA approved sensing face (Classics family), these fully embeddable inductive sensors offer a highly robust solution for the harshest operating environment. Industry standard PNP or NPN outputs with an integral M12 connector and IP69Krated cable set ensure compatibility with existing factory systems.
Flow control during milk product processing
Most milk products, whether made from pasteurized or raw milk, undergo a number of common manufacturing operations during the early stages of production. Central to these are two aspectsof process manufacture that require reliable, accurate flowcontrol systems: transportation and CIP. In each case, foodgrade washdown inductive sensors ensure that the correct operating sequence is followed.
Process engineers use dedicated stainlesssteel pipework to transport liquid ingredients from one operation to the next. Typically, fluid flow is managed using control valves fitted with electrical, hydraulic or pneumatic actuators. Depending on process requirements, twoway or multiport valves, often rotaryshaft types, deliverraw milk from holding tanks to each process station in sequence, maintaining specified flow rates and volumetric limits.
Classics Washdown sensors for position sensing
Sensing the position of a rotaryvalve actuator is a routine task for Contrinex Classics Washdown inductive sensors. In this application, the PPS sensing faces are not required to withstand extremes of temperature or pressure, and the 2mm sensing distance of these M12 diameter devices is ideally suited to the application.
These sensors interface directly with a range of industrial process controllers and provide cost effective confirmation of controlvalve status around the clock.Once processing of each batch is completed and all process vessels are drained, closedloop CIP cleaning is initiated. In many instances, plant managers rely on flow transfer panels to ensure separation of CIP and process flows; a flow transfer panel utilizes a multiport manifold that provides a physical break between flow streams in accordance with good manufacturing practices (GMPs). Connection between ports is effected manually by means of Ushaped jumper pipes with positional feedback from inductive sensors mounted on the panel.
Full Inox Washdown sensors for presence sensing
Manual connection carries with it a greater risk of direct contact between assembled parts. Contrinex Full Inox Washdown sensors provide optimum resistance to mechanical shocks, while of fering the option of extended sensing distances. Multiple M30 diameter devices, positioned at predetermined locations on each panel, sense the presence of a locating feature on each jumper pipe, confirming that the correct ports are interconnected before CIP cleaning is initiated. These units, with corrosion resistant one piece stainless steel housings and a 20mm sensing distance, protect against impact damage and also with stand accidental contact with aggressive CIP cleaning solutions.
Full Inox Washdown sensors for positional control
The need for accurate position sensing doesn’t end there. Downstream processing in soft cheese production is equally dependent on highly reliable washdown inductive sensors for effective control of day to day operations.
Curd making is the fundamental process in cheese production. Typically, soft cheese curd is made in large stainless steel vats, where milk is mixed with a curdling agent and heated gently, resulting in the separation of curd from the whey. Automated knives cut the curd particles to the correct size, following which the vat is tipped to discharge firstly the whey, followed by the curd.
Carefully controlled tipping is essential to prevent damage to the curd. The vat rotates slowly about a horizontally oriented support shaft. Washdown inductive sensors from the Full Inox family, mounted immediately adjacent to one side of the vat, detect the position of a cam on the shaft, confirming the degree of angular rotation at preset intervals. These M18 diameter one piece stainless steel devices, with a 10mm sensing distance, match the requirements perfectly.
Full Inox Washdown sensors for filling and packaging
Later, during filling and packaging operations, high volume soft cheese production also relies heavily on position sensing. Sealed tubs of cheese are conveyed from filling stations in single lanes; pneumatic cylinders, mounted beside each conveyor, divert multiple tubs into packing areas in preparation for layering. In these situations, it is essential to control the position of the ram accurately; failure to synchronize cylinder extension with conveyor movement results in damage to products and, potentially, to equipment.
Two M12diameter washdown sensors from the Contrinex Full Inox family, embedded in the wall of each cylinder, sense the presence of the ram as it reaches the limits of its travel in each direction. These highly robust devices withstand pressures of up to 80 bar (1160 psi) and operate reliably and accurately while exposed to the working pressures inside the cylinder.
Sensors with IOLink interface
Plantwide communication is another common requirement for manufacturers. In November 2014, Contrinex announced the availability of IOLink for all sensors incorporating its patented ASIC technology. IOLink, a standard ized point to point serial connection protocol for sensors and actuators, is enabled on all PNP normally open devices at no additional cost, offering the advantages of digital communication in washdown areas without the need for special cabling.
In dairy food production, processes run continuously, with remote diagnostics eliminating almost every need for manual intervention. Interrogating an IOLink enabled device returns its manufacturer ID and product ID, allowing systems integrators to determine remotely that the right sensor is in the correct location. Contrinex IOLink wash down sensors additionally feature an on demand self test function that confirms error free operation at all times.
Systems designers also have the capability to modify the output signal. Delaying the switching pulse accommodates any travel time between a sensor and its corresponding actuation point, while stretching the pulse ensures that slave devices with lengthy response times trigger reliably, even at high throughput rates.
Finally, each sensor provides an output status check derived from its factory calibration data. If the output signal from a sensor falls out side a range that corresponds to a sensing distance between 80% and 100% of its nominal value, an alarm flag is triggered, highlighting the need for investigation. For process engineers with demanding deadlines, peace of mind is a valuable benefit.
Contrinex sensors for food industry Contrinex Classics and Full Inox Washdown sensors provide a robust, cost effective and hygienic solution for manufacturers of foods, beverages and pharmaceuticals, whether on a local or multinational basis. Contrinex provides technical and commercial support via an extensive international distribution network, ensuring that every customer has access to expert product knowledge and directly relevant applications experience. Stainless steel construction and the nocost option of the industry standard IOLink protocol ensures that best in class performance is coupled with ultimate reliability in even the most demanding circumstances.