Product Categories
A conductivity meter calibration typically involves rinsing the probe, immersing it in standard solutions of known conductivity, adjusting the meter readings to match the standards, rinsing between standards, and verifying calibration with a final standard.
Conductivity is a crucial parameter in water quality assessment, providing valuable insights into the ionic content of solutions. From environmental monitoring to industrial processes, accurate conductivity measurements are essential for informed decision-making.
At the heart of this precision lies the process of conductivity calibration – a fundamental practice that ensures the reliability of our measurements.
Before we dive into calibration techniques, it’s essential to grasp the concept of conductivity itself. Electrical conductivity (EC) is a measure of a solution’s capability to conduct electrical current. In water, the electrical conductivity level is directly related to the concentration of dissolved ions present in the solution or water. Pure water is a poor conductor of electricity, but as more ions are introduced, the conductivity increases.
The basic unit of conductance is the Siemens (S), named after the German inventor Werner von Siemens. However, since this is a large unit, we typically use microSiemens per centimeter (µS/cm) to describe the conductivity of most solutions.
Conductivity measurements rely on a simple principle: two electrodes are placed in a solution, and an alternating current is applied. The voltage drop caused by the solution’s resistance is used to determine its conductivity.
Understanding the relationship between conductivity and ion concentration is crucial for interpreting your measurements. For example, in environmental monitoring, sudden changes in conductivity can indicate pollution events or other water quality issues, making regular and accurate calibration of your Atlas Scientific probe all the more important.
Calibration is the cornerstone of accurate conductivity measurements. Over time, even the most robust sensors, can drift from their initial calibration. This drift can be caused by various factors:
Regular calibration helps compensate for these factors, ensuring that your Atlas Scientific probe continues to deliver reliable results. But how often should you calibrate? As a general rule, it’s advisable to calibrate your conductivity meter at least once a year. (Although these probes can go without recalibration for ~10 years) However, for critical applications or in harsh environments, more frequent calibration may be necessary.
The Atlas Scientific conductivity probe is known for its stability, but even it benefits from regular calibration checks. By incorporating calibration into your routine maintenance schedule, you can catch any drift early and maintain the highest level of accuracy in your measurements. Remember, the frequency of calibration may also depend on regulatory requirements in your field, so always check relevant guidelines for your specific application.
There are two primary methods for calibrating conductivity sensors:
This is the most common method and involves using commercially available or laboratory-prepared standard solutions with known conductivity values.
The Atlas Scientific probe is compatible with a wide range of standard solutions, making this method particularly convenient.
This method involves comparing your Atlas Scientific probe’s readings with those of a previously calibrated, highly accurate instrument. This can be done in two ways:
a) In-process calibration: Connect the Atlas Scientific probe and the referee sensor in series, allowing the same solution to flow through both. This method is ideal for low-conductivity applications where contamination from atmospheric carbon dioxide is a concern.
b) Grab sample calibration: Take a sample of the process liquid and measure its conductivity using both the Atlas Scientific probe and the referee instrument. This method is suitable for higher conductivity solutions (above 100 µS/cm).
Let’s walk through a typical calibration process for the Atlas Scientific conductivity probe:
Of course, this process is easier when using the Atlas Desktop Monitoring Software, where calibration can be completed within the software, simplifying many of the above steps.
By following these steps and tips, you’ll ensure that your conductivity probe remains accurate and reliable, providing you with trustworthy data for your water quality assessments!
Proper maintenance of your Atlas Scientific conductivity probe is crucial for ensuring consistent performance and extending its lifespan. Here are some key maintenance practices:
Regular cleaning: After each use, rinse the probe with distilled water to remove any residual sample. For stubborn deposits, use a mild detergent solution and a soft brush. Never use abrasive materials that could damage the electrodes.
Storage: For short-term storage, keep the probe in distilled water. For long-term storage, ensure the probe is clean and dry before storing.
Electrode care: Inspect the electrodes regularly for signs of wear or damage. If the platinum black coating on the electrodes begins to wear, consider having the probe refurbished. OR, you can use the Atlas Scientific’s Conductivity Probe cleaning solution, which chemically removes both hard and soft coatings from conductivity probes.
Temperature sensor check: Periodically verify the accuracy of the built-in temperature sensor using a calibrated temperature sensor.
(if applicable: Only Atlas Scientific industrial conductivity probes have built-in temperature sensors.)
Cable management: Avoid sharp bends or kinks in the probe’s cable. Store the probe with the cable loosely coiled to prevent stress.
Chemical compatibility: Be aware of the chemical compatibility of your Atlas Scientific probe. While it’s designed to withstand a wide range of solutions, extremely caustic or acidic samples may damage the probe over time.
Calibration schedule: Maintain a regular calibration schedule based on your usage and application requirements. Increase calibration frequency if the probe is used in harsh environments or with highly conductive solutions.
Even with proper maintenance and calibration, you may occasionally encounter issues with your conductivity measurements. Here are some common problems and their potential solutions:
Mastering conductivity calibration is essential for anyone working with water quality measurements. By understanding the principles behind conductivity, the importance of regular calibration, and the specific needs of your Atlas Scientific conductivity probe, you can ensure the accuracy and reliability of your data.
Remember, calibration is not just a one-time event but an ongoing process that should be integrated into your regular measurement routine. By following the steps and tips outlined in this guide, you’ll be well-equipped to maintain your conductivity probe and troubleshoot any issues that may arise.
If you would like to learn more about calibration techniques or what conductivity probes and calibration solutions we have to offer, do not hesitate to contact the world-class team at Atlas Scientific.
Successful water quality monitoring in fracking is required to avoid surface and groundwater contamination. Sophisticated, multi-parameter, real-time systems promote compliance monitoring, early warning, and environmental
Water monitoring is becoming crucial as agricultural droughts become more common and the global population rises, and solutions are needed to feed everyone with less
