Dissolved oxygen meter for water treatment

Kaidi LR-DO700 dissolved oxygen sensor uses fluorescence to measure dissolved oxygen. The blue light emitted is irradiated on the fluorescent layer. The fluorescent substance is excited to emit red light, and the oxygen concentration is inversely proportional to the time for the fluorescent substance to return to the ground state. This method is used to measure dissolved oxygen, no oxygen consumption will occur during the measurement, the data is stable, the performance is reliable, there is no interference, and the installation and calibration are simple.　　LR-DO700 controller is used to display the data measured by the sensor, and the user can realize 4-20mA analog output through the interface configuration and calibration of the controller. It can realize functions such as relay control and digital communication.　　 LR-DO700 and LR-DO700 composed of analyzer can realize the measurement of dissolved oxygen concentration in water. This product is widely used in the monitoring of dissolved oxygen in sewage plants, water plants, water stations, surface water, aquaculture, industry and other fields. The sensor and controller diagrams are shown in Figures 1 and 2. Figure 1 LR-DO700 Dissolved Oxygen Sensor 1-Measuring Cap 2-Temperature Sensor 3-1' NPT4- Quick Connector Male Connector Figure 2 LR-DO700 Controller Relay, Output and Signal Controller is equipped with three configurable relay switches and two channels Analog output. 　　 sensor and sensor module controller is a single-parameter controller that can accommodate one sensor. 　　 controller housing The controller housing has an IP65 protection level. For outdoor use, it is strongly recommended to take protective measures to prevent environmental damage. 　　1 Take out the dissolved oxygen sensor, Clean the sensor with a clean cloth (soft texture and smooth surface). 　　2 Place the sensor in a calibration bag containing an appropriate amount of water (about 20-30mL), as shown in the figure 3 Seal the sensor firmly with a rubber band or bare hands 4 Let After the instrument data is stable (or about 10 minutes), start the calibration again, and avoid direct sunlight.　　5 Make sure that the sensor settings are correct 6 Enter the corresponding controller setting menu and follow the steps of Menu﹥Probe Settings﹥Calibration﹥Air Calibration Operation.　　7 Wait for the value to stabilize and press the confirm key to complete the calibration. If it succeeds, the new calibration slope will be displayed, and if it fails, the original calibration slope will be displayed. (The slope range should be between 0-1.5, if the slope is exceeded, the calibration fails and needs to be re-calibrated) 　　calibration Note: 　　 Please make sure that the calibration package is tightly sealed. When calibrating, make sure that the sensor is dry to allow enough time to ensure that the sensor temperature is stable at the temperature of the calibration package. Calibration 1 Take out the dissolved oxygen sensor and use a clean cloth (soft texture) And the surface is smooth) Clean the sensor 2 Put the sensor into a solution with known dissolved oxygen value (this operation needs to be in an oxygen-free environment) 　　 3 Enter the controller menu and follow the steps of Menu﹥Probe setting﹥Calibration﹥Standard sample calibration Operation. At this time, the screen displays the measured value and the standard solution value. 4 After waiting for the value to stabilize, enter the standard solution value and press the enter key to complete the calibration. 　　 5 Take out and dry the sensor. When the calibration is completed, if the calibration fails, there may be problems. If the gain is too high or too low and unstable, the solution is to re-calibrate according to the calibration procedure.

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