What are the functional characteristics and application steps of the on-line dissolved oxygen electrode

Working principle of online dissolved oxygen electrode:

The sensor cover of the measuring probe is covered with a layer of fluorescent substance. The blue light emitted by the LED light source irradiates the fluorescent substance, which is excited and emits red light. A photocell measures how long it takes a fluorescent substance to go from emitting red light to returning to its ground state. This time is only related to the emission time of blue light and the amount of oxygen. The probe also has an LED light source, which emits red light at the same time of blue light emission, as a reference of blue light emission time. The more oxygen around the sensor, the less time the fluorescent material has to emit red light. So let's figure out the concentration of dissolved oxygen.

Functional characteristics of the on-line dissolved oxygen electrode:

Sensor adopts oxygen sensitive film, with NTC temperature function, the measurement results have good repeatability and stability;

No oxygen consumption during measurement, no flow rate/agitation requirement;

Breakthrough fluorescent technology without membranes and electrolytes;

Built-in self-diagnosis function to ensure data accuracy;

Factory calibration, one year without calibration, on-site calibration;

Digital sensor, strong anti-interference ability, long transmission distance;

Standard digital signal output, can be realized in the case of no transmitter and other equipment integration and networking;

Field installation is convenient and quick to achieve plug and play;

Positive and negative power supply reverse connection protection;

The sensor RS485A/B is improperly connected to power supply protection.

Procedure for using the online dissolved oxygen electrode:

1. The electrode and the reference electrode together, using a magnetic stirrer in deionized water to clean the electrode potential.

2. After electrode cleaning, electrode correction should be carried out: test electrode potential from thin to concentrated in two or more standard solutions of different concentrations of chloride ions and record. Draw a standard curve of "MV-PCL" based on the recorded mv value and pcl value (the negative pair of chloride ion concentration).

3. Use electrodes to measure the sample, record the measured mv value, read the corresponding pcl value on the standard curve, and then calculate the chloride ion concentration of the sample.