Hanna Instruments COMBO pH/Redox/°C tester, waterproof HI98121
The Hanna Instruments COMBO pH/Redox/°C tester, waterproof HI98121 offers a compact, floatable design and is designed for precise pH, redox and temperature measurements. Thanks to reliable components, this device is ideal for use in laboratories, water analysis or industrial areas where accurate and fast measurements are required in the field. Users who are looking for other combination measuring devices and therefore a wider selection for different measuring tasks can turn to similarly equipped devices such as the [Hanna Instruments HI9813-5].
Functional scope and advantages
This measuring device impresses with its high precision in the pH and redox range as well as its uncomplicated handling during regular sampling. The robust housing is waterproof and floats if it is accidentally dropped into water. An integrated HOLD function allows important measured values to be recorded, while the automatic switch-off function ensures efficient battery consumption. In addition, the battery level indicator contributes to smooth operation.
The replaceable pH electrode is particularly useful. It is protected by a special textile diaphragm that counteracts contamination. If there is a heavy build-up of particles, this diaphragm can be pulled out millimetre by millimetre to restore a clean and sensitive surface. If the textile diaphragm is used up, the pH electrode can be easily replaced without having to replace the entire device. A permanently installed electrode is integrated for the redox potential, which is calibrated at the factory.Thanks to automatic temperature compensation (ATC), the tester delivers stable results even with fluctuating ambient temperatures. It can be used in a wide temperature range, allowing measurements to be carried out both at intervals and continuously at a consistently high level. In practice, the measured values are ideal for checking water quality, chemical processes and various specifications in industrial production.
Technical data and special features
- pH range: -2.00 to 16.00 with a resolution of 0.01 pH and an accuracy of ±0.05 pH
- Redox range: ±1000 mV with a resolution of 1 mV and an accuracy of ±2 mV
- Temperature range: -5.0 to 60 °C, resolution of 0.1 °C and accuracy of ±0.5 °C
- Waterproof housing and floatable design
- Automatic temperature compensation for reliable pH measurements
- Automatic switch-off after eight minutes to conserve battery power
- Replaceable pH electrode with retractable textile diaphragm
- Integrated HOLD function for recording measured values
In addition, the device is resistant to typical environmental conditions in laboratories and industry and ensures that all measurements remain correct even at a humidity of up to 100 %. The enclosed buffer solutions and replacement tool facilitate regular calibration and electrode replacement. However, in order to achieve correct long-term results, a suitable storage and calibration solution should always be used, which can be purchased separately.
Concrete application examples
- Aquariums and fish farming: Accurate determination of the pH value and redox potential is essential to ensure the well-being of fish.
- Wastewater analysis: Regular measurement of key parameters in the inflow and outflow supports process control in wastewater treatment plants.
- Food industry: In the food and beverage sector, reliable pH determination helps to monitor the manufacturing process, for example for juices, pasta or milk-processing products.
- Process control in the chemical industry: If oxidative or reductive reactions are to be monitored, the redox potential serves as an important indicator for stable production processes.
- Testing surface treatment solutions: Especially when coating or etching, constant pH and redox monitoring is crucial in order to achieve consistent product qualities.
FAQs
How often should the device be calibrated
?
For precise measurements, regular calibration is recommended, for example every one to two weeks or if there are noticeable deviations in the measured values. In addition, calibration should always be carried out before important measurement series.
What maintenance work is required on the pH electrode?
The pH electrode should be stored in a suitable storage solution and treated with suitable cleaning solutions as required. The measurement performance can be extended by removing the textile diaphragm.
Is the device suitable for outdoor use?
Yes, thanks to its waterproof and robust housing, it can be used outdoors without any problems. However, in very low temperatures or extreme conditions, attention should be paid to the recommended environmental parameters.
How long does the battery pack last?
The four 1.5 V batteries generally enable continuous operation for around 250 hours. Here too, the automatic switch-off function extends the operating time.
Does the redox potential need to be recalibrated regularly?
No, the redox electrode is calibrated at the factory and does not require user calibration. However, it is advisable to carry out a comparison with a test solution from time to time.
Conclusion
This waterproof, floatable measuring device combines precise pH, redox and temperature measurements in a compact format and therefore meets the high demands of laboratories and industrial practice. The replaceable pH electrode with retractable diaphragm saves running costs and makes the device a sound long-term investment. Whether waste water monitoring, process optimization or quality assurance in food and beverage companies - the multifunctional device ensures reliable measurements and thus supports efficient and safe day-to-day work.
