Dissolved oxygen sensor

one.How Dissolved oxygen sensor works

Dissolved oxygen sensor is used to measure dissolved oxygen in water and aqueous solutions to determine the amount of oxygen dissolved or carried in the water.The fluorescence method Dissolved oxygen sensor is designed based on the quenching principle of specific substances in physics for excitation fluorescence.When excitation light irradiates the fluorescent substance on the surface of the fluorescent film head, the fluorescent substance is excited and emits fluorescent.The extinguishing time of the fluorescent is affected by the concentration of oxygen molecules on the surface of the fluorescent film head.By detecting the luminescence lifetime of fluorescence, the concentration of oxygen molecules can be calculated, and the final value can be output through temperature, air pressure and salinity compensation.

two.Dissolved oxygen sensor technical parameters

three.Dissolved oxygen sensor size/installation

1.Dissolved oxygen sensor size diagram

2.Dissolved oxygen sensor wiring diagram

The cable is a 4-core shielded wire:

Red cable—Power cable

Blue line—Ground line (GND) Green line—485B

Yellow line—485A

Different production batches, the cable colors vary slightly.Please refer to cable silkscreen for details.

3.Dissolved oxygen sensor installation

Before powering on, carefully check the wiring sequence to avoid unnecessary losses caused by wiring errors.The wiring should be waterproofed.

Four.Dissolved oxygen sensor maintenance and maintenance

1) Outer surface of the sensor: Rinse the outer surface of the sensor with clean water.If there is still dirt residue, please wipe it with a moist soft cloth.For some stubborn dirt, you can add some household detergent liquid to the water to clean it.

2) Fluorescent film head surface: If there is dirt on the surface of the fluorescent film head, rinse with clean water or gently wipe with a soft cloth.Pay attention to avoid scratches in the measurement area and affecting the measurement accuracy when cleaning.

3) If the measurement value is too high or too low, you need to clean the fluorescent film head and stir the film head during measurement to prevent the surface of the film head from being adhered to by external objects.

five.Dissolved oxygen sensor sensor calibration

5.1 Zero Point Calibration

Add 95mL of water to 5g of sodium sulfite and stir evenly, put the sensor into the solution, wait for the value to stabilize for 3 minutes, and perform zero-point calibration according to the communication instructions.

5.2 Slope calibration

Place the sensor in air-saturated water, wait for the value to stabilize for about 3 minutes and perform slope calibration, and perform zero-point calibration according to the communication instructions.

5.3 Things to note

Avoid sunlight or strong light on the inner surface of the fluorescent film.Do not touch the fluorescent film with your hands or sharp objects.

Avoid air bubbles attached to the surface of the fluorescent film when in use