Dissolved oxygen & multiparameter meters

The main difference is maintenance. An optical sensor measures by luminescence and needs no electrolyte, so there is nothing to refill, as with the portable optical dissolved oxygen meter with 10 m cable. A polarographic sensor works with an electrolyte behind a membrane: you refill the electrolyte and replace the membrane cap at the intervals in the manual, using the electrolyte solution for polarographic probes. Choose optical for low maintenance and field work, polarographic where you already have the routine. Questions? Ask sales@luminixhealth.com.

If you only measure oxygen, a dedicated meter is simpler to operate and to document. If you also measure pH or conductivity at the same sampling points, a multiparameter meter gives you one instrument, one display and one log, which saves time in the field. Check on the product page which parameters each model really measures and how many sensor inputs it has, as with the pH/EC multiparameter portable meter. Single-parameter alternatives are in conductivity meters and cells and pH meters. Tell us your parameters and we will suggest a set-up: sales@luminixhealth.com.

Choose by where you measure. For field measurements in rivers, basins or tanks, a portable meter with a long cable is the practical choice; read the protection rating on the product page before using it outdoors. For a quick check at a single point, a pocket-size meter is light and fast. In the laboratory, where you measure many samples and want to store data, a benchtop model is easier to use and document. Memory and data functions are listed on each product page. Accessories and solutions are in pH and electrochemistry accessories. Unsure? Ask sales@luminixhealth.com.

Follow the manual of your meter; it sets the calibration points and intervals. Most meters calibrate at saturation in air and many add a zero point, for which you use the zero oxygen solution, 500 ml. Polarographic sensors also need fresh electrolyte and a new membrane cap from time to time; optical sensors need a sensor cap replaced at the interval the manual gives. Rinse the sensor after use and store it as described. Buffers and standards for your other parameters are in pH buffers and conductivity standards. Questions? Ask sales@luminixhealth.com.

A dissolved-oxygen meter reads oxygen in a liquid, optically or with a Clark cell. A multiparameter meter adds pH, conductivity or both on one instrument. The sensor cap or the membrane is the consumable. A reading in air and a reading in water are different calibrations.

A pH meter is a voltmeter on a glass electrode. The voltage tracks hydrogen-ion activity, and the electrode is converted to pH only after it is adjusted with buffers of known value. Conductivity measures how well a solution carries a current, which for dilute salts tracks concentration. Dissolved oxygen and titration are further electrodes on the same idea: a sensor, a standard, and a reading that is only as fresh as the calibration. Buffer values and chemical identity sit on PubChem. Accreditation of the calibration laboratory is the field of BELAC and EURAMET.

This shelf belongs to pH & electrochemistry, inside Lab instruments. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are pH electrodes & sensors, pH meters, Conductivity meters & cells, Titrators & electrochemistry systems and pH & electrochemistry accessories. The category above this shelf is pH & electrochemistry.

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