HUMIDITY CONTROL
of humidity control or the customer’s true requirements.
If the right questions are asked at the outset, it is frequently possible to arrive at a less expensive solution that still meets the customer’s control requirements. For instance, many printers believe t hey need very close RH control but, in reality, maintaining a RH between 40% and 60% will be perfectly adequate.
If static electricity is an issue, this can be avoided by maintaining the RH above 55% – it d oes not have to be 55% +/-1% RH.
E ven in applications where the requirements a re outside the normal RH range, such as >80% RH in a cold store, charcuterie or food processing facility, it is possible to achieve the desired conditions without over-engineering t he system. Simply using a sensor that is able to c ontrol the system at these conditions with good repeatability will usually be sufficient, and still achieve a tolerance of +/-5% RH.
For further peace of mind, humidification systems can now be equipped with remote monitoring, control and diagnostics to improve reliability and detect any issues immediately. This approach also ensures that planned
maintenance is undertaken on the basis of hours-
run or fault indications – in other words, when it is needed rather than simply based on time. The underlying message of this is that in t he vast majority of projects, even if their requirements fall outside what might be
c onsidered as ‘standard’, the necessary tolerances can be delivered using standard off-the-shelf e quipment and consumables.
So, although an end customer may know the temperature and RH they require for a particular
product or process, a lack of understanding can l ead to a request for unnecessarily tight control that pushes the project into a price bracket that is not cost-effective, and might even lead to the project being abandoned.
There is, therefore, a clear responsibility on t hose of us working in the industry to help end c ustomers fully understand what their true requirements are, and to deliver the best solution accordingly.
Heronhill
For all your humidification requirements
www.heronhill.co.uk 23
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