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The norm ISO/IEC 17025:2017 describes requirements for the competences of testing and calibration laboratories

This is the reference Standard for which most laboratories must hold the accreditation, where the technical requirements need that the work area must be suitable to accommodate the lab equipments and to allow all operational activities by the personnel.
It indicates clearly that the environmental conditions must be kept under continuous control of temperature, relative humidity, static pressure and other parameters to which it is necessary to refer, so that the latter cannot negatively influence the outcome of the lab activity itself.
The control of the climatic conditions inside the laboratory guarantee the quality and continuity of operation for the laboratory activities, as well as favor the accreditation of the laboratory.

The test results of several analyses performed on samples with variable characteristics are comparable and reproducible only if they are carried out in a laboratory at standard atmosphere, as specified by national and international norms.

The Standard represents a concern for everyone in laboratory sectors and helps us to understand that it is very important to keep under close-control the parameters known as temperature, relative humidity, dew point, air speed and definitely how to evaluate all fundamental elements which could influence the Standard Atmosphere of a Laboratory.

In Metrology and precision engineering and mechanical applications focused on dimensional and three-dimension measurements it is clear that temperature determines measurements uncertainty, e.g. let's think about the uncertainty of gauge blocks calibration or using cmm4 and it's immediately clear that the relative contribution of temperature is at the third place just after the relative contribution of samples used and that one of comparator.

In the design and construction steps of a conditioned laboratory, the sizing of the system is determined on the basis of the presumed thermal loads and the choice of the constructive characteristics of a machine is based on the performance required for the type of conditioning to be applied within a laboratory.

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They are essential and significant elements to best meet the project specifications in order to minimize the spatial and temporal thermal gradients.

The selection of a suitable model of Branca Climatic units is definitely the right choice to achieve the goal in order to reduce measurements uncertainty.

According to the Standard ISO 1, a temperature controlled room must achieve a reference value of 20C considering some structural adjustments how to reduce thermal gradients inside the working area improving the welfare of laboratory personnel and economical benefits through an ECO friendly system.

Since 1932, the S.T.A. Branca Idealair - technical department has been following the design of conditioned laboratories from A to Z, including all the activities necessary for the development and construction of turnkey and trademarked test laboratories.

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We list some of the technical characteristics of the precision climatic units of the Branca Idealair:

AIR FLOW DISTRIBUTION:
The air flow is distributed into laboratory at low air speed less than 0,15 m/s, diffused slightly by the false ceiling or by special ducts. In presence of internal heat surveys generated from laboratory, e.g. HVI or CCS systems for Textile materials classing, then to be able to reduce the horizontal temperature gradients the heat is naturally recovered by suction airflows and partially absorbed by false ceiling. The heat dissipation produced by the laboratory lighting is recovered by Climatic unit as ECO post-heating contribution. The use of led lamps allows to reduce thermal gradients under the ceiling excluding at minimum percent heat stratifications and Coanda effects.

CLOSE-CONTROL AND ADVANCED PERFORMANCES
- Electronic modulating control on refrigerant circuits without compressor stop (on Stand-by up to 50% of energy saving);
- Heating and humidification commanded by SSR assuring maximum reliability of the system in the long period;
- 7" HMI User Interface with Touch Screen technology, user-friendly offers an overall view of parameters reading and setting with reading resolution at 0,01C for Temperature and 0,01% for Relative Humidity, flexible too for Custom software implementation;
- Refrigerant circuit control set by electronic modulating control valves on LOW pressure circuit improves the parameters stability;
- Evaporators heat exchanger made in copper/copper material allows to prevent the redox effect of contact between fins and tubes due the galvanic reaction of different conductors, e.g. common in copper/aluminum in presence of condensing water greedy of ions;

AIR FILTRATION:
The air pollution is a growing problem e.g. urban and industry areas; the increase of air pollution in population and factories expand, then cleaning the air has become a concern for everyone once chosing an air conditioning system. The main air contaminants as solid particles are dusts, fumes, smoke, pollen (e.g. 10 or 100 micron), pollen grains, bacteria and molds; moreover we can include the liquid impurities as mists and fogs, but also the gases as vapors, and others.
Pre-filtration and final filtration before and after the unit fan has the function to trap any dust particles or concentrated bacterias as Legionella, Penicillium, Alternaria, Cladosporio, Aspergillus, Thermoactinomyces candidus etc.
Bacterias are microorganisms responsible for the transfer of many deseases, harmful and objectionable to the breathing apparatus of the human people working inside laboratories;
- Water purification by "Reverse Osmosis system" permits to produce demineralized water at 0F to feed the humdification group of the Climatic unit;

OPERATION MODE:
NORMAL and ECO mode can be programmed both daily and weekly on request.

ENERGY SAVE:
Power recovery of sensible and latent heat passing through crossing air flows composed of fresh air and exhausted air through the special heat exchanger devices.

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