REGULAR


conductive probes fitted into the wash tank which measure the level of alkalinity in the tank. Historically these have proven to be unreliable because they can be adversely affected by lime-scale and organic matter in the tank leading to variable results through under/over dosing.


It should be noted that the detergent used in dish and glass washing is normally a corrosive liquid and real care needs to be taken when handling such a product. Improper use can cause severe skin burns or irreparable damage to the eyes.


It is in this area where a system such as Duotek 4 should be used. The system utilises a revolutionary safety mechanism in the neck of the 5l flask, forming a leak-proof connection between the chemical flask and the electronic dosing equipment. By choosing cleaning power and this unique safety feature, users can be confident that the possibility of coming into contact with corrosive chemicals is minimised.


AUTOMATED LIQUID LAUNDRY


CHEMICAL DOSING By comparison to dish washing liquid, laundry is a more complex area to successfully get auto-dosing right. The premise, however, is the same – electronically controlling the dosing of liquid laundry detergents to ensure that the correct amount of laundry chemicals (detergents, destainers, fabric conditioners and finishing products) are dosed at the appropriate stage of every wash cycle. Done right, this will yield the best possible wash results as cost effectively as possible.


Because the dosing systems are pre- set and automated, there is minimum manual handling of the chemicals, little chance of human error and less chance of chemicals being wasted unnecessarily.


The sophisticated equipment used is highly flexible and can be programmed to dispense all laundry chemicals at whatever dose levels required for each wash programme selected. With most modern commercial laundry machines having up to 20 different wash programmes, this level of flexibility is essential.


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For example, different levels of detergent can be set depending on wash load types; softeners can be added at different levels or not added at all; and specialist chemicals such as emulsifiers or starches can be programmed as required. The number of dosing permutations caters for every launderer’s requirements.


“Because the dosing systems are pre-set


and automated, there is minimum manual


handling of the chemicals, little chance of human


error and less chance of chemicals being wasted unnecessarily.”


The volume of chemical concentrate delivered by the pump is dependent on pump size or capacity, tubing diameter size and the length of time that the pump runs. Generally, a pump should be capable of delivering the required doses of chemicals within a 45-60 second window whilst the water flush valve is open so it is important that the correct sizes of pumps are chosen in relation to the demand/size of the washer extractor machines.


The programming of dosing equipment is extremely important and must be carried out by experienced chemical laundry technicians otherwise the system will be compromised and the laundry may not achieve optimum results.


Chemical dosing within a laundry environment is far more complex and sensitive than in mechanical glass and dish washing. Only reputable chemical suppliers will have the knowledge and know-how to do this properly. Once everything is calibrated and set-up, the laundry system will be strictly controlled to dispense precise doses of laundry chemicals into each wash programme.


DRAIN CLEANING &


ELECTRONIC DOSING Smelly or blocked drains can cause serious problems for the commercial


caterer or hospitality business. However, premises can easily keep drains flowing freely with the use of specialised biological products that digest organic matter.


These products are made up of a concentrated blend of natural micro-organisms and biodegradable surfactants designed to digest fats, grease and organic matter in an environmentally sensitive way. They are designed to be drip fed through an automatic dosing system.


When dosed into the drainage system the ‘friendly’ bacteria create enzymes to accelerate the natural degradation process, turning potentially drain blocking fats into harmless simple sugars, carbon dioxide and water. The concentrate is dosed into the drain or grease trap at a time when the site is less active (generally at night).


In a standard hotel/restaurant, a daily dose rate of 150-200ml is sufficient to maintain drains and grease traps, yielding between 100-133 days treatment from a 20l container. Larger commercial properties with industrial sized grease traps may require stronger solutions of specialised drain chemicals and more powerful equipment to dose larger quantities of chemicals. In such premises, it is critical that accurate dosing levels are maintained to ensure that water regulatory guidelines set by local water authorities are not breached. Continuous breaches can lead to very hefty fines and in extreme cases imprisonment.


Next month, we’ll examine the importance of chemical suppliers being able to provide effective, reliable and professional ongoing engineering support for their customers. Without this, it is impossible to achieve consistent, quality results when using controlled dilution systems (electronic or manual). In simple terms, there is clearly little point in having a modern dosing unit fitted if it is not installed, maintained, and programmed correctly.


Read more of Max’s musings at the Arpal Group blog here.


www.rpadam.co.uk www.arpalgulf.com


Tomorrow’s Cleaning June 2016 | 29


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