As a general laboratory instrument, the pHit Scanner can operate under a multitude of scenarios, can be exposed to a variety of temperatures, can function in both small and large sample volumes, and can be used to measure a broad array of samples. The examples below are only the tip of the iceberg when it comes to the amount of data that has been gathered internally. If you are interested in seeing more data, please visit our applications page where we continue to update with new tests from our labs.
Throughout these experiments, we used top-of-the-line bench pH meters from 4 different manufacturers and compared these results against our pHit handheld pH scanner. The conventional glass pH meters were calibrated prior to each use, and we performed a health sensor check on each pHit handheld scanner prior to use.
The pHit Scanner’s robust design and technology allows for the pHit Scanner to be exposed to a variety of challenging scenarios without experiencing a decrease in performance. Some scenarios we have tested include bleach rinsing and CIP. In this instance, we performed a ladder test in a buffer temperature of 25 °C. We started our measurements in a BDH pH 2 buffer solution, increasing to pH 12, and then decreasing back to pH 2.
Figure 1 (above) shows the pHit sensor’s ability to adjust to each new pH reading without hysteresis or memory effects. These results demonstrate the ability of the pHit Scanner to read consistently in both increasing and decreasing pH without any negative side effects.
The pHit handheld scanner can measure samples within a temperature range of 5°C to 50°C. The internal thermistor also has a response time of less than 60 seconds. Like conventional pH meters, the resulting measurements of the pHit Scanner are temperature compensated. Figure 1 above shows the ability of the pHit Scanner to compensate the pH reading based on the temperature of the sample solution.
A common question we receive is how well the pHit handheld scanner is able to measure small volumes. The best way to address this question is in the form an experiment. Using one pHit Scanner and four conventional glass meters, we attempted to measure 200 uL of standard buffer solution. As you can see, one of our glass pH meters was unable to read throughout this entire experiment.
Figure 2 shows that the pHit Scanner was accurately able to measure the pH of our small volume samples without much trouble, whereas the glass pH meters occasionally read much higher and lower than the pH buffer sample used. It should also be noted that the glass pH meters struggled to stabilize on many occasions. As previously mentioned, one of our glass pH meters was unable to measure the small volume sample and is not shown on this graph.
One of the greatest benefits of the pHit Scanner’s solid state sensor and non-porous design is evident when measuring with solid and semi-solid items, a frequent occurrence in the food industry. The solid-state design cannot be clogged and is very easy to clean. In Figure 4 below, we measured a variety of samples ranging from Shampoo to Catfish to Avocados. Like the previous experiments, we measured using one pHit handheld scanner and four conventional glass pH meters.
Figure 3 above shows the ability of the pHit to accurately measure the variety of solid and semi-solid samples provided. As mentioned, the solid-state sensor is very easy to clean – you can see any and all residue which allows you to confidently clean the sensor. The glass pH meters we used were difficult to clean because of the porous nature and design; this resulted in extensive cleaning to ensure that every single part of the electrode did not retain any residue from the sample. Additionally, one of the glass meters was unable to read the sample of catfish.
We are continuously compiling new data. Please visit our Applications Map or Briefs and Data page where you can find out more about what we’ve measured and the resulting data that was generated using the pHit Scanner.