Water Activity Measurement
You already know that water activity measurement is important to maintaining the high product quality and product shelf life you strive for. Whether you are measuring water activity in foods or in other applications, quality, accuracy, and excellence are of utmost importance to you.
That’s why we’d like to introduce you to a brand that would guarantee the highest quality and innovation - the Novasina Swiss line of water activity meters.
The Novasina brand developed a unique electrolytic measuring chamber that enables highly accurate measurement of the relative equilibrium humidity of materials, the water activity (aw-value). These instruments are used around the world in many industries from food and pharmaceuticals, to oil and chemicals. The water activity instruments can be used in water activity measurement for process and quality control, on the production line, or for laboratory analysis and product development.
Our in-house team of specialists and highly trained engineers will take care of servicing, maintaining, and calibrating the equipment for you. Let us know if you need any assistance!
FREQUENTLY ASKED QUESTIONS
Water activity is greatly affected by temperature, thus its standardized at 25°C and that is the temperature used by regulatory agencies.
Temperature control assures higher accuracy results, provides a constant equilibrated environment for repeatable testing and complies with regulatory testing that is carried out at 25°C.
The calibration standard salts that come with the unit are used in two ways. They are used for calibration, so there is always an accurate curve to compare your samples to. They are also meant to provide you with a means for verification daily. This way you can identify any drift in your readings and correct it or call us for support,
Yes, you can certainly use the standards multiple times. These salts are NOT disposable. They have a shelf life of 2–4 years depending on factors such as storage conditions (storage container must be well closed), frequency of use, exposure to light and the value of the standard.
Calibration frequency is based on your internal SOP but a good rule of thumb is to carry out a calibration at least once per month and to carry out a verification at the start of each day.
Yes, the Novasina units in conjunction with special protective filters can be used to measure samples that contain volatiles. We strongly recommend the use of filters if there is any doubt to protect and prolong the life of the sensor.
No, Novasina units are very simple to use and do not require much maintenance. We suggest keeping the units clean and wiping them down at the end of each day with a cloth and keeping the measuring chamber clean and free of debris. Also, we recommend having a PM (Preventative Maintenance) completed once a year to keep the unit running in top condition.
Yes, Neutec provides 3 different services for the water activity units. A PM (Preventative Maintenance) service, a VC (Verification Calibration) service and a CC (Certified Calibration) service. All three of the services come with completion documents and the Certified Calibration is also 21 CFR Part 11 compliant from a government certified laboratory.
A PM (preventative maintenance) is a proactive measure taken to ensure that your unit does not suffer any damage due to preventable issues caused by wear and tear and that it continues to run like new for years to come. A PM is completed by performing a full “tune up” of the unit, which includes full diagnostics, calibration, replacement of pre-filters, internal sterilization, cleaning and certification.
It will mainly depend on the sample itself, as different materials release water at different rates. Our units report the AW value once the equilibrium point has been reached. Yet you can stop the unit at any time and take a reading. Waiting to reach stability is the most accurate method. Speeding this process may result in inaccurate results generated and recorded.