Installation and maintenance of low range turbidity sensor

1. Water tank

The water tank, water valve, and connecting pipeline form a complete water sample collection system to ensure correct water sample collection and appropriate response time; The water sample flow rate is stable, moderate, and controllable, providing a reliable foundation for the normal operation of the instrument. The functions of each part are as follows:

Inlet valve: controls the flow rate of the water sample.

Diverter valve: regulates water sample flow rate to adapt to response time.

Water tank: The stable amount of water sample flowing through the sensor (the height difference between the water tank and the sensor determines the water sample flow through the sensor).

2. Installation requirements

(1) The instrument should be installed on a flat, dry, and ventilated wall surface. Avoid corrosive liquids and gases from corroding.

(2) The instrument should be installed in a convenient location for sampling and drainage, and should not be too far from the sampling port.

(3) The installation height of the instrument should be suitable, easy to operate, use, and maintain.

(4) The instrument installation cannot be tilted, it should be vertical and horizontal.

(5) Do not install the instrument in places with strong light, strong electromagnetic interference, and intense vibration.

(6) The instrument fixation and pipeline connection should be firm.

3. Installation steps:

(1) After unpacking the instrument, check if the accessories are complete and if there is any damage to the surface of the instrument. Before installation, carefully read the instructions and determine the installation plan based on the instrument performance and usage requirements.

(2) Connect the power supply, the power supply should be safe and reliable, uninterrupted power supply, separate dedicated line, and not shared with high-power electrical equipment.

(3) Install the sampling inlet pipe, and install the inlet valve and diversion valve at the inlet.

(4) Install drainage pipes to direct the drainage to an appropriate location for discharge. It is recommended to use drainage pipesφA hard plastic pipe with a diameter of 50mm or more to ensure smooth drainage.

(5) Fixed water tank, sensors, and secondary instruments.

(6) Waterway connection:

A. Connect the water tank outlet and sensor inlet using a random accessory (water pipe with bidirectional interface).

B. Use reinforced soft plastic pipes (to ensure smooth waterway) to connect the following locations:

Connect the sampling port and the water tank inlet;

Introduce the overflow from the water tank into the drainage pipeline;

Introduce the water tank drainage pipe into the drainage pipeline;

Introduce the sensor water into the drainage pipeline;

Introduce sensor drainage into the drainage pipeline;

(7) Connect the sensor and secondary instrument with a cable, and connect the power supply of the secondary instrument.

4. Waterway debugging

(1) First, open the diversion valve, drain valve of the water tank and sensor, and then slowly open the inlet valve to check if the inlet adjustment and diversion pressure reduction are normal.

(2) After the accumulated dirt in the sampling pipe is drained, close the diversion valve and check whether the water sample can be smoothly discharged from the water tank drain and enter the drainage pipeline.

(3) Close the drain valve of the water tank again and check if the water sample can be smoothly discharged from the sensor drain and enter the drainage pipeline.

(4) Close the drain valve of the sensor again and check if the water sample can flow smoothly from the sensor outlet into the drainage pipeline.

(5) Use a measuring cup to test the water sample flow rate at the sensor outlet, with 0-20 NTU and 0-50 NTU selected at 400-600 mL/min; If the flow rate is not suitable, the installation height of the water tank can be adjusted appropriately, with 0-100NTU and 0-200NTU selected at 600-800mL/min.

(6) Use a measuring cup to test the overflow water sample flow rate of the water tank. The flow rate is generally selected between 200-300mL/min. If it is not suitable, adjust the opening size of the inlet valve.

(7) If it is necessary to reduce the water pressure or make the instrument respond more quickly to changes in the turbidity of the water sample, the size of the diversion valve can be appropriately opened.

(8) Check the entire waterway system, whether the connections are securely fixed, whether there are any leaks, and whether the water sample flows smoothly.

3、 Maintenance

(1) Check the water sample flow rate and instrument operation once a day, clean the instrument surface and work site.

(2) Discharge water once every two days by separately draining over 200mL of water sample from the diversion valve, water tank drain valve, and sensor drain valve to prevent system fouling.

(3) Clean the water tank once every two weeks, allowing the water sample to flow out of the tank drain valve while brushing the inner wall of the clean water tank.

(4) Clean the sensor once a month by removing the sensor core and scrubbing all parts in contact with the sensor and water sample with clean water. The cleaned wastewater is discharged through the sensor drain valve. Wipe and rinse the photoelectric window with a soft cloth that cannot remove fibers and pure water. If there is severe dirt accumulation, add household detergent for cleaning. Pay attention to this operation, be careful not to touch or scratch the photoelectric window, and do not let water seep into the movement.

(5) Calibrate at least once every quarter using comparative methods.

(6) Calibrate at least once a year using the standard turbidity method.