Support

Please check whether your question is mentioned below. If not, do not hesitate to ask your question via info@sentron.nl .
We’ll come back to you as soon as possible.

Please refer to support@sentron.nl  for any issues regarding the use of your purchased products, or check the section Delivery and Returns at Terms and Conditions.

Please contact us at support@sentron.nl , or check the section Delivery and Returns at Terms and Conditions. We’ll guide you through the best approach to either get the product repaired or to switch to our new product line of wireless pH probes with the use of a mobile phone/tablet and the free app for pH measurements.

Please contact us at support@sentron.nl , or check the section Delivery and Returns at Terms and Conditions. We’ll guide you through the best approach to either get the product repaired or to switch to our new product line of wireless pH probes with the use of a mobile phone/tablet and the free app for pH measurements.

Any smartphone or tablet, using iOS or Android, can be used to download and use the application, as long as it has Bluetooth version 5.0 or higher.

Yes, we have!

  • Clean your probe regularly during use. 
  • Make sure that the medium which is being measured, is in contact with the ISFET (which is the blinking part at the tip) and the diaphragm (which is the white dot at the tip) simultaneously. 
  • When using the probes with semi-solids, insert probe to desired depth, then rotate left and right several times and tilt to ensure sample contact.
  • When testing in direct sunlight or on a bright reflecting surface, please use brown, opaque or shielded sample containers. Very bright light might influence the performance of the sensor.

Yes! Proper maintenance of a probe is important. If the probe is not cleaned properly and regularly, probe malfunction can occur due to a polluted diaphragm or ISFET. The cause for this pollution is usually the sample.

Pollution on/or blockage of the sensor and reference electrode diaphragm surface is the most likely cause for probe failure. If any of the following events occur: low slope, drift, instability of the reading, slow calibration, probe will not calibrate, pH value doesn’t change as expected when changing samples, start the cleaning procedure as described below and perform a revitalization. 

Probe wear is another cause for probe failure. Probe wear is often, but not necessarily, preceded by a period of declining calibration slope values. Probe wear is dependent on how the probe is used, stored. Worn probes need to be replaced.

The appropriate cleaning frequency is dependent on the type of sample being measured. A good rule of thumb to use when sampling colored liquids is when the reference diaphragm is no longer white, the probe should be cleaned.

Both the surface of the chip (the shiny dot at the probe’s tip) and the diaphragm (the white surface on the probe tip) are to be cleaned. Place the probe in warm tap water (around 60°C / 140°F) with a mild detergent for 5 minutes, stir periodically. Scrub the probe tip with a soft tooth brush and water with a mild detergent. After scrubbing rinse with demineralized water.

Never brush the probe tip, especially the ISFET chip, before rinsing and flushing thoroughly with water. Before rinsing debris and particles may be on the sensor surface and brushing them into the sensor may damage it. When in doubt, soak the probe for a while in warm water with a mild detergent.

NB Do not use hydrofluoric acid, acetone, MEK or similar agents to clean the probe. Do not exceed 80°C / 180°F as this may damage the probe.

Yes, you can try the following. Revitalization is performed to regenerate the diaphragm of the reference electrode in the pH probe. The diaphragm is part of the so called reference electrode and necessary for pH measurements. 

Prepare saturated KCl (potassium chloride) solution: Add KCl-granules to distilled water until no more KCl will dissolve. Adding 38 grams of KCl to 100 ml water is sufficient. Let this stand for at least two hours and decant the clear solution. Now you have saturated KCl.

For best results, clean the probe first. Make sure the probe is still warm (around 60°C / 140°F) and place the probe directly (without flushing it with demineralized water or cooling it down) in a saturated KCl-solution at room temperature and let it stand for 20 minutes. This ‘cold’ KCl-dip will regenerate the reference system and the diaphragm.

For short time periods (≤ 2 days) probes can be stored best “wet” in e.g. a beaker with pH7. Clean the probe first with demineralized water and possibly a mild detergent. Then place it in a clean container with fresh pH7 buffer to prevent pollution of the probe directly after cleaning.

For longer time periods (>2 days) the probe can be stored “dry” in e.g. the shipping box. As well as with short term storage, clean the probe first. Then place the protective cap on the probe tip, containing one drop of demineralized water preventing a dry out of the diaphragm.

Always revitalize the probe before using it again after a long term storage.