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Glass-free pH, EC and ORP measurements
pH and conductivity are critical parameters in a multitude of areas, including research, agriculture, water environment, food, industry and more. Sentron has developed a comprehensive line of wireless glass-free probes for pH, EC and ORP measurements on your own phone or tablet.
Besides ISFET and EC, Sentron develops and manufactures MEMS pressure sensors.
Sentron is now part of Millar
This integration into Millar has enhanced Sentron’s capabilities and offerings, allowing us to provide more innovative solutions for our customer’s sensing needs.
Laboratory
Whether you run a large-scale laboratory or whether you are in a classroom, the safety and integrity of your studies and instrumentation is of the utmost importance. The Sentron laboratory glass-free multiparameter probes with ISFET pH, electrical conductivity and ORP deliver precision while offering simplicity and versatility.
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Agriculture
Agriculture varies from the home gardener to horticulture with commercial greenhouses. They all have a common thread: they sustain the world. Testing, monitoring and adjusting growth parameters help to maximize efficiency, quality and production. Sentron glass-free ISFET pH probes and the multiparameter probes for pH, conductivity and ORP are a good solution for this.
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Industrial
In many industries, pH and ORP are critical parameters. These industries include food (e.g. meat, dairy beverage, wine and beer), pharmacy, textile and water treatment. pH testing during the manufacturing process can enhance production usability, accuracy and excellence.
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Environment
Take the lab with you. Our wireless handheld pH probe with glass-free ISFET pH technology makes it ideal for measuring the pH and EC of water in tougher settings. Take direct pH, conductivity, ORP and temperature measurements for water quality monitoring using your smartphone or tablet.
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Durable, accurate, wireless
Wireless and durably replaceable, our premium pH ISFET probe enables you to monitor this essential parameter in whatever application, whenever you want and wherever you are.
Simply interchange the sensor part for the sensor part with pH sensor, with the conductivity sensor, or with the multisensor part for pH, EC and ORP.
Complete control from the Sentron app.
Multiple connected devices
Connect multiple probes to monitor for example the pH values of your entire greenhouse at the same time.
Intuitive instructions
Get instructed step by step to calibrate and set up your measurements.
50 meter Bluetooth range
Thanks to improved antenna technology and the low energy Bluetooth, your probe will still be connected to the mobile device even long distance.
Real-time notifications
Receive real-time notifications on your phone or tablet whenever the value of the pH is out of reach.
Cloud based
Never lose any data and have your data available anytime and anywhere.
GPS location
When GPS is enabled at your mobile device, the location will be added to your data log. Ideal for outdoor application like agriculture!
What’s next?
By taking a serious look at all applications, we keep entering into new innovations in our semiconductor production facility. Recently we launched the sensors for EC and ORP, with which great multisensor solutions for e.g. water monitoring can be provided.
Additionally, we continue our R&D on ion-selective membranes for the ISFET sensors. Additionally, we are working on new MEMS – for even smaller pressure sensors than we already have.
Ion-selective sensors
Sentron is working on innovative developments on ion-selective sensors that have a membrane mixture suitable for detection of different ions based on the ISFET technology. Selectivity is based on proprietary modifications with several polymer matrix configurations.
Nitrate (NO3–), Ammonium (NH4+) and Potassium (K+) are currently in development.
It’s all about sensors
Besides the wireless and durable pH probe product line, you can also reach out to us for any customized sensor integration into your own product.
ISFET (Ion Sensitive Field Effect Transistor) pH sensor
The non-glass ISFET (Ion Sensitive Field Effect Transistor) pH sensor is one of the sensors that we produce in our semiconductor production facility. It is robust and does not require wet storage. This makes it well suited for, e.g., agriculture, water environment, food and other industrial applications. Our ISFET assemblies are used successfully in the market of FDA approved and CE certificated medical devices for the medical application in gastro-enterology.
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Contract development
Full wheatstone bridge pressure sensors
In our facility we also produce the advanced miniature piezo resistive sensor that is equipped with a full Wheatstone bridge for differential pressure measurements: thus, no influence due to atmospheric changes. The narrow dimensions of this pressure sensor make it ideally suited for medical applications. Our pressure sensor assemblies are already on the market in medical devices for cardiology, as well as for neurology and urology catheters.
4-electrode conductivity sensor for EC
The EC is the measure of a material’s ability to allow the transport of an electric charge. This knowledge is important for water-quality monitoring in public water supplies, in hospitals, in boiler water and in industries which depend on water quality such as horticulture and breweries.
We produce the EC sensor in our own foundry. There are many applications where it would be beneficial to measure both pH and electrical conductivity. Some examples include:
- Agriculture: In agriculture, measuring the pH and electrical conductivity of soil can help farmers determine the appropriate amount of fertilizer to apply to their crops.
- Aquaculture: In aquaculture, measuring the pH and electrical conductivity of water can help maintain proper conditions for fish and other aquatic organisms.
- Industrial processes: In various industrial processes, measuring the pH and electrical conductivity of liquids can help monitor the quality of products and ensure consistent production.
- Environmental monitoring: In environmental monitoring, measuring the pH and electrical conductivity of water can help identify pollution and monitor the health of aquatic ecosystems.
Low conductivities are expected for pure water applications like aquaria, household, drinking water and rivers. On the other side, high conductivities are expected for industries like irrigation and greenhouses.
ORP: Oxidation / Reduction Potential
The ORP is the measure of the tendency of aqueous solutions, or any other chemical species, to either acquire electrons from an electrode and be reduced thereby, or to lose electrons to an electrode and be oxidized thereby. This knowledge is important for water-quality monitoring in aquaria, swimming pools, as well as environmental and wastewater sampling. E.g. ORP is an indicator of micro-organism inactivation in a swimming pool or spa pool.
Measuring pH and oxidation-reduction potential (ORP) together can provide valuable information in a variety of applications. Here are a few examples:
- Water treatment: In water treatment, measuring pH and ORP can help determine the effectiveness of water treatment processes and ensure that the water is safe for consumption.
- Chemical manufacturing: In chemical manufacturing, measuring pH and ORP can help monitor the quality of products and optimize production processes.
- Environmental monitoring: In environmental monitoring, measuring pH and ORP can help identify pollution and monitor the health of aquatic ecosystems.
- Food and beverage production: In food and beverage production, measuring pH and ORP can help ensure the quality and safety of products.
High ORP values (positive potentials) are expected for aerated surface water, rivers, lakes, oceans and rainwater. Low ORP values (negative potentials) are expected in places with limitations in air supply such as submerged soils, swamps and marine sediments.
Multiple parameter monitoring with one single device
Imagine, all parameters to be monitored using one single device. It is possible with the pH/EC/ORP/T probes, see our shop.
Measuring pH, electrical conductivity (EC) , and oxidation-reduction potential (ORP) together can provide valuable information in a variety of applications. Here are a few examples:
- Water treatment: In water treatment, measuring pH, electrical conductivity, and ORP can help determine the effectiveness of water treatment processes and ensure that the water is safe for consumption.
- Chemical manufacturing: In chemical manufacturing, measuring pH, electrical conductivity, and ORP can help monitor the quality of products and optimize production processes.
- Environmental monitoring: In environmental monitoring, measuring pH, electrical conductivity, and ORP can help identify pollution and monitor the health of aquatic ecosystems.
- Aquaculture: In aquaculture, measuring pH, electrical conductivity, and ORP can help maintain proper conditions for fish and other aquatic organisms.
- Food and beverage production: In food and beverage production, measuring pH, electrical conductivity, and ORP can help ensure the quality and safety of products.
The EC and ORP are available as extra parameters in the wireless ISFET pH probe product line. This means that all three parameters can be measured with high precision and accuracy in one single device. This would make it a versatile and convenient tool for various applications, reducing the need for multiple probes and devices.
Additionally, the Sentron app provides user-friendly software and data management features that make it easy for users to record, analyze, and share their data.
The probes are reliable and durable as they can be easily renewed with just the replaceable sensor part. This is particularly beneficial for users who require frequent use and rigorous testing conditions.
Frequently Asked Questions
What is the proposition of Sentron Europe?
Sentron Europe does manufacture sensors in her semiconductor production facility in Leek, The Netherlands. These are small sensors of just 1 to 3 millimeters or less. The sensors are used in the sensor integration services that are offered to OEM customers. Together with these partners we develop and produce OEM sensor products to a variety of markets: medical, agriculture, water, food, or else. Besides these OEM products, Sentron manufactures standard probes as well. These are available in the web shop.
Besides the ISFET pH sensor, which sensors does Sentron manufacture?
In our semiconductor production facility we also produce the 4-electrode conductivity sensor for EC.
Besides these we produce the advanced miniature piezo resistive pressure sensor. This sensor is created using Sentron’s proprietary full Wheatstone bridge for differential pressure measurements. Thanks to this differential pressure measurement atmospheric changes have no effect. The sensor is stable with low drift in varying pressure and temperature environments. See the page sensor integration services for more information.
Does Sentron produce MEMS (Micro-Electro-Mechanical Systems)?
Yes! We are not just the founders, but also the manufacturers of our MEMS and ISFET sensors. With years of experience in developing chip technologies, we have the knowledge and expertise to seamlessly integrate our sensors into innovative products that meet your needs.
What do the differential pressure sensor, ISFET sensor and EC sensor have in common?
The differential pressure sensor with full Wheatstone bridge, the ISFET sensor and the EC sensor are all very small. The largest is 3 mm in length, but most are much smaller than that. They are used for example in medical catheters for cardiology or urology where size does matter.
Do you just have the ISFET pH sensor in your standard probe products?
No, we recently released the multiparameter sensor part with the ISFET pH and temperature sensors, as well as the EC sensor for electrical conductivity. With this combination the probes can also be used for ORP. It is to measure the oxidative reduction potential. All these parameters are read out by the same Sentron app.
What is the main difference between glass and ISFET pH probes, besides the material?
Glass pH probes measure the hydrogen ion concentration in a solution, while ISFET pH probes measure the hydrogen ion activity. The difference lies in the fact that the hydrogen ion activity takes into account not just the concentration of the ions but also their interaction with other ions in the solution. This is why ISFET pH probes are often considered more accurate than glass pH probes, especially in complex solutions where there may be a lot of competing ions. Additionally, ISFET pH probes are not affected by changes in temperature, as glass pH probes can be.
What is the benefit of ISFET pH to other pH technologies like the conventional glass pH?
Thanks to the technology the ISFET pH sensors are robust and can be stored dry. This has a great benefit for applications like water quality measurements in stream beds and tidal areas, where the water level changes in time and the probe will occasionally be above the water level.
Another advantage of is the response rate of ISFET pH sensors. It is faster than glass bulb pH sensors, thus providing faster measurements and enabling better process control.
Moreover, the glass-free approach makes the pH also available for inline food processes and medical applications like gastro-enterology, for which any glass splinter could be fatal.
What is the disadvantage of ISFET pH to other pH technologies like the conventional glass pH?
The ISFET pH sensor is sensitive to direct sunlight, so the best applications for the ISFET pH sensor are in the soil, in water tubing systems, in food, in medical applications like the gastro-intestinal tract, etc.
What is the added value of the wireless, Bluetooth, probes compared to wired pH probes?
The wireless product line has connection with the mobile device via Bluetooth. No cable is used. No limitation of just 1 probe per meter. No maximum of 1.5 meters distance anymore. In other words, the wireless probe enables more flexibility and use cases than the wired probes.
What is the advantage of the Sentron app?
The Sentron app is free and can be installed at any mobile device (Bluetooth 5.0), including your own. Multiple probes can be connected at the same mobile device and read out simultaneously. Moreover the smartphone features are used for the datalogging, like GPS location, and export functions are simple, like social media, cloud use, etc.
Where conventional pH meters are hard to understand, the Sentron app is very intuitive. It guides you through all required steps like the calibration. With animations it shows you exactly what to do at which points. Please judge yourself: it is available for iOS and Android in the AppStore and PlayStore!
Where can I purchase the wireless Bluetooth pH/temperature probes?
You can purchase the probes at our web shop. Per product a description is provided, as well as suggestions for products to add to your cart.
Do the pH probes have ATC, Automatic Temperature Compensation?
Yes, the pH probes do make use of the automatic temperature compensation during the calibration procedure. ATC improves accuracy and keeps the electrode in calibration regardless of the temperature.
During pH calibration and EC calibration, ATC reads the true temperature of the buffer and assigns the exact correct value. During sample or interval measurements, ATC reads the true temperature of the sample and adjusts the slope to remain in collaboration.
I am interested in becoming a distributor. How do I get connected?
Let’s get connected and see whether we have a match. Please refer to info@sentron.nl and we’ll contact you as soon as possible.
Do you sell probes only, or do you provide OEM services as well?
Besides the standard product-line, we also provide contract development and contract manufacturing of sensor assemblies. More information on our OEM services can be found at Sensor Integration Services.
I am interested in the sensor integration service for my own product development. How do I get connected?
We would love to hear more about your product development. Together we will discuss whether our sensor integration service would be suitable for your product. Please refer to info@sentron.nl and we’ll contact you as soon as possible.
I do have the Sentron SI400 or SI600 meter. Can I still purchase the pH probes for this obsolete SI pH meter?
While the SI400 and SI600 pH meters themselves are out of stock, the wired probes for these meters can still be purchased at our webshop. However, we strongly suggest to take a look at the new, wireless, product line as it has several benefits and great features compared to the cabled pH product line.
I have a question more related to the wireless pH probe itself, like shelf life, use, cleaning procedures. Where can I find these?
At our support page you might find your answer to more specific probe related questions. If not, please do not hesitate to refer to info@sentron.nl for personal contact.