Save yourself time and effort. Get accurate O2 measurements!
Dissolved oxygen is a critical control parameter in many applications: in wastewater treatment influencing plant efficiency, in surface water monitoring and fish farming indicating water quality, and in multiple production processes affecting e.g. product shelf-life.
Measuring dissolved oxygen with a Clark electrode has been a standard method for decades and it has its challenges: polarisation time, frequent re-calibration, drift, interferences and a lot of maintenance effort.
In 2003 Hach was the first to introduce a solution to these issues, which has since revolutionised the market: Optical oxygen measurement with the LDO sensor!
LDO stands for Luminescent Dissolved Oxygen. The amount of O2 is determined using a layer sensitive to oxygen that is excited by blue light. It emits red light back, an effect that is termed luminescence. The time between excitation and the red light emission is determined by the oxygen concentration in the sample.
1 LED, 2 Reference LED, 3 Photodiode
The more dissolved oxygen there is in the sample, the shorter the time it takes for the red light to be emitted.
Read on to find out how LDO can make your daily work easier!
How to measure dissolved oxygen efficiently and easily
LDO is definitively the best technology to measure DO, whether in the field, lab or online. It combines quality of results and ease of use with low maintenance.
A typical wastewater treatment plant with 12 oxygen sensors may save approx. 200 hours of maintenance and calibration per year!
No replacement of electrolyte, no interference by deposits or H2S
Flow-free sensor without oxygen consumption ensures precise and accurate measurements at over the whole measuring range
Intelligent INTELLICAL technology features an automatic reminder to change the sensor cap each year ensuring error-free results with minimum effort.
With LDO technology there is no more waiting time for the electrode to polarise. The INTELLICAL sensor is plugged into the instrument and ready to go! The robust HQD meters are available in single or dual channel versions ready to also measure pH, ORP and conductivity.
HQD portable and benchtop meters with digital INTELLICAL electrodes
Easy to use, no matter where you use it.
HQD’s user friendly meters allow even new operators to produce accurate measurements while reducing possible errors, saving you time and hassle. Additionally, the durable design is built to handle the toughest conditions, in both the field and the lab.
Automatically detect the testing parameter and calibration history
Large graphic display makes the results easy to read, even in difficult light conditions
Mix and match of electrodes and meters ensures reliability and flexibility
Immersion or flow-through probe with optical luminescence measuring method. Years of practical experience have shown that this method completely overcomes the disadvantages of traditional electrochemical O2 measurement methods.
Calibration-free & drift-free
Extremely reliable - 3 year warranty on probe
Remote functions for simple and convenient data transfer via Internet and SMS