Product spills are a fact of life in dairy factories and town milk treatment plants. These spills are now more difficult to detect because of the recent trend of reducing the number of plant operators employed in wet areas of dairies.
Another factor common to many town milk treatment plants, is that few have their own wastewater treatment plants and rely on the local municipal waste water treatment plant to clean up their plant waste. LTH reports that the cost of lost product is huge with acknowledged losses of 10 000 to 40 000 litres of product in a typical spill.
Until recently, with no easy way of being alerted to spills, many plants resorted to 'the solution to pollution is dilution' method. In this scenario 'identified' product spills are washed down the drain with large volumes of water to dilute the waste. If the spill is identified quickly all this does is remove the peaks from the BOD charges. However, as the time from the start of the spill to the time of detection is often unknown, it is not always possible to know how much product has already been discharged to the drain.
This is at best a hit-and-miss solution to an immediate problem and does nothing to eliminate future product losses and the associated clean up costs.
LTH has designed and developed the MSSD53SI suspended solids monitor and associated S20 immersion sensor, which can immediately identify when milk products have been discharged to the drain.
The LTH MSSD53SI suspended solids monitor and associated S20 immersion sensor
The S20 immersion sensor uses proven Quadbeam technology, which compensates both for changes, due to ageing of the optical components and also build-up on the sensor surface. These sensors can be mounted in a guard assembly in the bottom of the drain with the sensor guard fingers resting on the bottom of the drain.
The sensor is connected via a 10 m connection cable to a MSSD53SI transmitter, which provides a proportional 4 to 20 mA current output signal that is usually connected to a DCS or PLC system. Once the milk spill in the drain has been detected by the sensor, the operator has an audio/visual alarm 'pop up' on the automation system display that will allow him to identify and correct the spill before any significant amount of milk has been discharged, saving you major product losses and money caused from product loss.
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