A 111,800 µS/cm standard solution for reliable calibration
Over time, the performance of a conductivity probe can change. Residue buildup on the electrodes, repeated cleaning, or simply the aging of the sensor can all slightly alter the displayed values. The Milwaukee MA9065 solution at 111,800 µS/cm allows you to verify that the device remains correctly calibrated and to perform a new calibration when necessary.
This high conductivity value is intended for devices whose calibration procedure specifies a standard of 111.8 mS/cm, or 111,800 µS/cm . Before use, it is therefore important to consult the instruction manual of the conductivity meter or tester to verify that this value corresponds to the calibration point specified by the manufacturer.
A conductivity solution prepared with a NIST reference
Milwaukee pays particular attention to the stability of its calibration solutions. MA9065 is prepared with potassium chloride calibrated from the NIST 2202 SRM reference material . This traceability provides a sound metrological basis for the verification of conductivity measuring devices.
The solution is prepared in deionized water intended for analytical use , in accordance with the requirements associated with ISO 3696 and BS 3978 standards. This level of preparation makes it possible to obtain a homogeneous and reproducible solution, particularly interesting when a precise measurement is required in the laboratory, in aquaristics or in any other application using a compatible conductivity meter.
Why recalibrate a conductivity meter regularly?
A conductivity meter does not necessarily maintain the same accuracy throughout its lifespan without regular maintenance. The probe is directly exposed to the liquids being measured and can gradually accumulate mineral deposits, salts, or other residues . Even a perfectly maintained probe can change over time.
Using a known and stable calibration solution allows you to compare the measurement displayed by the device to a reference value. If a discrepancy appears, the conductivity meter can then be recalibrated according to the procedure specified by its manufacturer. This simple operation helps maintain reliable measurements and avoids working for several weeks or months with a device that is gradually out of calibration.
Temperature-dependent conductivity correction
The conductivity of a solution naturally varies with temperature. Therefore, the same standard solution may exhibit a slightly different value depending on whether it is used in a cool room, at room temperature, or in a warmer environment.
To facilitate verification, Milwaukee prints a table directly onto each bottle of MA9065, indicating the actual conductivity of the solution at different temperatures . This makes it much simpler to verify the expected value during calibration, particularly with devices that do not have automatic temperature compensation or when manual verification is desired.
Milwaukee MA9065 230ml bottle protected against air and light
The stability of a standard solution also depends on its packaging. Milwaukee MA9065 is offered in a 230 ml hermetically sealed bottle with a tamper-evident cap. Its packaging helps limit exchange with air and protect the solution from light before opening.
Each bottle also bears a batch number and an expiration date to facilitate product tracking and to immediately determine if the solution can still be used as a reference. Under normal storage conditions and before opening, MA9065 has a shelf life of up to 5 years .
Instructions for using the Milwaukee MA9065 solution
To best preserve the accuracy of the solution, it is preferable to pour only the necessary amount into a clean container rather than directly immersing a potentially contaminated probe in the original bottle. Ideally, the calibration solution should not be returned to the bottle to avoid any contamination that could gradually alter its conductivity.
The conductivity meter probe must be clean and thoroughly rinsed before calibration. Then, simply follow the procedure provided by the device manufacturer, using the value corresponding to the solution temperature. Finally, the bottle cap must be carefully closed after each use to minimize evaporation and exposure to the environment.
Features of the Milwaukee MA9065 conductivity solution
- Reference: Milwaukee MA9065
- Type: conductivity standard solution
- Nominal value: 111,800 µS/cm
- Equivalence: 111.8 mS/cm
- Reference composition: potassium chloride solution
- Traceability: NIST 2202 SRM
- Preparation: deionized water for analytical use
- Water used conforms to: ISO 3696 / BS 3978
- Capacity: 230 ml
- Packaging: airtight bottle with tamper-evident cap
- Identification: batch number and expiry date on each bottle
- Calibration aid: conductivity table according to temperature printed on the bottle
- Shelf life: up to 5 years before the indicated expiry date
