KFDO601 Online Fluorescence Dissolved Oxygen No Electrolyte Is Required And Will Not Be Polarized No Oxygen Consumption

1.Operational Principle

KFDO601 integrated on-line fluorescence dissolved oxygen sensor is designed and fabricated based on the quenching principle of excited fluorescence by specific substances in physics. When the excitation light is shone on the fluorescent material on the surface of the fluorescent film head, the fluorescent material is excited and emits fluorescence. The quenching time of fluorescence is affected by the concentration of oxygen molecules on the surface of the fluorescent film head.By detecting the phase difference between fluorescence and excitation light and comparing with the internal calibration curve, the concentration of oxygen molecules can be calculated, and the final value can be output after temperature and salinity compensation.

2.Feature

• No electrolyte is required and will not be polarized.
• No oxygen consumption, not affected by flow rate.
• Built-in temperature sensor, automatic temperature compensation.
• Free from interference by chemicals such as sulfides
• Small drift, rapid reaction, more accurate measurement.
• Long service cycle, lower cost of use.
• Simple replacement of fluorescent cap.
• Rs-485 interface, Modbus/RTU protocol.
• Low power consumption,anti-interference.

3.Technical Specifications

4.Dimensional Drawing

Note:The sensor connector is m16-5 core waterproof connector male.

5.Installation and Electrical Connection

5.1 Install

The sensor shall be installed fixedly below the liquid level. The installation and use shall avoid collision or scraping against the surface of the fluorescent film head. The fluorescent film head part shall avoid being attached by the bottom sediment.Remove the rubber cover when use.

5.2 Electrical connection

• Red wire-power cord(12～24 V)
• Black wire-ground wire(GND)
• Blue Line-485 A
• White Line-485 B

Check wiring sequence carefully before power on to avoid unnecessary losses caused by wiring errors.

Wiring instructions: Considering that the cables have been immersed in water (including seawater) or exposed to air for a long time, all wiring positions are required to be waterproof, and the cables should have certain corrosion resistance.

6.Maintenance

6.1 Maintenance Schedule and Methodology

6.1.1 Maintenance Schedule

Different from the dissolved oxygen probe technology of electrochemical principle, the fluorescence dissolved oxygen probe does not consume oxygen and does not need to be cleaned frequently (except when it is used in viscous liquid).

Note: The maintenance frequency in the above table is only recommended, and the maintenance personnel shall clean the sensor according to the actual use of the sensor; however, the replacement frequency of the fluorescent cap is recommended once a year.

6.1.2 Maintenance Method

a) Sensor outer surface: clean the outer surface of the sensor with tap water, if there is still debris residue, wipe with wet soft cloth, for some stubborn dirt, you can add some household washing liquid to tap water to clean.

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

c) Inside the fluorescent film head: it is generally unnecessary to clean. If water vapor or dust enters into the fluorescent film head, the cleaning steps are as follows:

• Screw down the fluorescent film head;
• Rinse the inner surface of the fluorescent film head and the optical window of the sensor.
• For oily dirt, you can use household cleaning solution;
• Gently dry the water with a clean flannelless cloth and let dry;
• Reinstall the fluorescent film head.

d) Check the cables of the sensor: there should be no damage to the skin and root of the cables;Terminals should not be submerged in water;When the sensor is normally installed, the cable should not be tensioned, otherwise the internal wire of the cable will easily break and the sensor cannot work normally.

e) Check whether the casing of the sensor is damaged by corrosion or other causes.

f) Daily storage of fluorescent film head: When not in use, a rubber protective cover with a wet sponge should be covered to keep the surface of the measuring area of fluorescent film head wet.If the surface of the measuring area of the sensor fluorescent film head is chronically dry, measurement error or data instability will occur, and it shall be soaked in water for 48 hours before use.

6.2 Frequently Questions

6.3 Calibration of Sensors

a) Zero Calibration

Weighing 5 g of sodium sulfite by a balance, adding 95mL of water into a 250-mL measuring cylinder, pouring the water into a beaker, adding the sodium sulfite which has been weighed, stirring with a glass rod, dissolving, and obtaining a solution of 5% sodium sulfite, putting the sensor in a solution, And the zero point calibration is carried out after the three-minute numerical stability is stable. Refer to the Appendix to the instructions

b) Slope Calibration

The sensor probe is placed in air saturated water and the slope is calibrated after 3 minutes of numerical stability. The instructions refer to the appendix.

c) Preparation of Air Saturated Water: add 2% 3 volume fresh distilled water to the constant temperature water bath to float the porous plastic sheet on the water surface (see figure below). At the same time, the bubbler (air pump) is used to aerate the water continuously for more than 1 hour, stop aeration, and get air saturated water after 20 minutes or so. Put the sensor into the water and calibrate the

slope after the numerical value is stable.

Note: as an option, slope calibration can also be performed in water-saturated air. Put the sensor in a calibration bottle with a small amount of water (the probe is higher than the water surface 2-3mm) to ensure that the sensor film cap remains wet but has no water droplets, and the calibration slope is calibrated after 3 minutes of numerical stability.

6.4 Points for Attention

• Avoid sun exposure to the inner surface of the fluorescent cap.
• Please don't touch the fluorescent film with your hands.
• Measuring and calibrating the surface of fluorescent film to avoid attaching bubbles.
• Avoid directly applying any mechanical stress (pressure, scratches, etc.) to the fluorescent film in use.

7. Quality and Service

7.1 Quality Assurance

• The quality inspection department has a standard inspection procedure, with advanced and complete detection equipment and means, and according to the procedure inspection, the product is subjected to 72-hour aging experiment and stability experiment, so that a non-conforming product is not allowed to leave the factory.
• The consignee shall refund directly the product batches with a failure rate of 2%, and all expenses incurred shall be borne by the supplier. Consider the standard reference to the product description provided by the supplier.
• Ensure the quantity of goods and the speed of shipment.

7.2 Spare Parts and Spare Parts

This product includes:

• 1 sensor
• 1 copy of the manual
• 1 certificate

7.3 After-sales Service Commitment

The company provides after-sales service for this machine within one year from the date of sale, but does not include the damage caused by improper use. If you need to repair or adjust, please send it back, but the freight must be borne by yourself, and it is necessary to make sure that the packing is good to avoid damage in transit. We will repair the damage of the instrument free of charge.

Contact Us

Website www.kacise.com
Phone +86-17719566736
Email sales@kacise.com
Location Tangyan South Road, High-tech Zone, Xi'an City, Shaanxi Province, China