The installation point of the monitoring equipment should be able to timely and accurately reflect the dynamic changes in the water quality of the monitored waters. Avoid installing in dead ends, stall belts, shoals, local water quality specific locations, etc. of the monitored water body. The installation point of the monitoring equipment should ensure the stable working state of the equipment. Avoid installation in places prone to rapids, external impacts, strong vibrations, loss and theft. The installation point of the monitoring equipment should try to consider the convenience of equipment installation and daily maintenance personnel. Avoid installation in locations where large construction machinery, special auxiliary equipment, and personal safety risks to installation and maintenance personnel are required. The Tanabe sluice gate is on the river side and is suitable for pole installation. (Pole installation is the use of water collection devices to lift the water body to the monitoring instrument for measurement, the water body circulates in real time, there is no deterioration or pollution, to ensure the measurement accuracy.) ）
Pole installation is to erect the monitoring equipment body on the pole, and the erection position is above the highest flood level to ensure that the equipment is not soaked by water. The water intake pump and the water intake pipeline adopt hidden installation, the pipeline between the water intake point and the pole adopts buried hidden, and the pipe between the pole and the instrument is passed in the middle of the hollow pole to avoid affecting the landscape.
According to the on-site installation conditions and the site selection requirements of the online water quality analyzer, the monitoring equipment adopts pole installation. The installation process is as follows:
(1) After selecting the installation location according to the site selection principle, the concrete base with an area of 1 square meter is poured in the predetermined position, and the buried ground cage is used to fix the pole during the pouring process.
(2) After the foundation is poured, start to install the pole, and adjust the instrument mounting bracket to ensure the level of the installation bracket, and after the bracket is adjusted in place, the tightening bolt fixes the mounting bracket.
(3) Instrument installation adjustment instrument bolt hole position is consistent with the mounting rack hole position, using the specified type of screw to fix the instrument and mounting bracket.
(4) The water intake pump and the water intake pipeline adopt hidden installation, the pipeline between the river channel and the pole adopts buried hidden, and the pipe between the pole and the instrument is passed in the middle of the hollow pole to avoid affecting the river landscape.
The water collection system is an adjustable water intake (continuous or intermittent) system. Can be automatically controlled and operated on site; with system fault automatic diagnosis, alarm and recording function; with power failure protection function, can be automatically restored to operation by incoming calls; can be set the mode of operation, continuous or intermittent operation; with automatic blowback cleaning function, can set the cleaning cycle; the system should have an automatic algae killing unit, there is a function to inhibit the breeding of algae and other aquatic organisms (such as shellfish) in the system, to prevent the breeding of algae; outside the pipeline should be necessary waterproof, anti-pressure, anti-freeze protection measures. The replacement of the water intake pipe in the buried part between the equipment and the river bank of the water intake point adopts the aluminum-plastic pipe for high-quality hot water that is suitable for the outlet diameter of the pump.
(1) Water collection pump
(1) Choose the submersible pump submersible pump as a high-quality brand, stainless steel material, and the pump is equipped with a corresponding coarse filtration protection device to prevent large debris such as stones and branches in the water from damaging the pump. The water intake pump selects a low-voltage 12v submersible pump with a flow rate of 6lpm to meet the monitoring needs, and selects the appropriate power and head according to the actual needs of each station to meet the water supply needs.
(2) The use of double pump / double pipeline water mining, one mining and one backup, to meet the requirements of real-time uninterrupted monitoring; and when one way fails, it can automatically switch to another way to work to ensure the normal operation of the entire system. The system will report the fault through the self-inspection system, and the maintenance personnel can go to replace and repair.
(3) The water collection pump has the function of automatic recovery after power outage and then start
(2) Water intake pipeline
(1) The water production pipeline should be installed with insulation casing for insulation treatment, and pvc pipes should be applied externally to reduce the impact of factors such as ambient temperature on water samples, so as to ensure that the impact on the monitoring results of the measurement project (except water temperature) must be less than 5% (the impact of water temperature must be less than 20%).
(2) Necessary antifreeze measures to ensure that the sampling pipeline is not frozen and cracked at low temperatures in winter.
(3) The water collection pipe adopts rock hose, upvc pipe and other materials with stable materials to avoid pollution of water samples.
(4) The pipeline adopts an emptying design so that there is no water in the pipeline to prevent algae breeding. The water intake adopts the bracket and float combination water intake method, and the water intake can change with the water level, ensuring that the water inlet hole of the water intake pipe is located at a position of 0.5m to 1m below the water surface, and maintaining a certain distance from the river bottom, ensuring that a representative water sample that meets the monitoring needs is collected, and ensuring the continuous normal use of the sampling tip. The pontoon device is equipped with a device to block garbage in the water and prevent the water inlet from blocking. The water intake system has an automatic lifting device, which is convenient for manual lifting and installation, and manual daily cleaning and maintenance are very convenient. The water collection pipeline is installed with polyethylene insulation casing for insulation treatment, which can reduce the impact of environmental temperature and other factors on the water sample, and the pipeline is cleaned and installed; in order to prevent accidental blockage and facilitate cleaning after sediment deposition, all the water collection pipelines in the water collection system adopt removable and washable connections, that is, each buried corner must be equipped with a living joint. Continuous or intermittent adjustable working mode; the working mode can be selected according to the owner and local conditions, and the monitoring frequency can be set on site according to the monitoring requirements. The water harvesting unit does not significantly affect the test results of the sample monitoring project. The drainage point is located more than 10 meters downstream of the sample water collection point. According to the actual situation of the site, make the necessary heat preservation, anti-freeze, anti-pressure, anti-silt, anti-collision, anti-theft measures, and carry out the necessary fixation of water collection equipment and facilities; in order to prevent accidental blockage and facilitate cleaning after sediment deposition, the water collection pipeline adopts the removable washable type. The water collection device includes a pump, a pipeline, a power supply flow rate regulation device, a water level monitoring device and a regulating valve, a protective pipe and the corresponding detection, control, and drive electrical circuits, and the system should adopt a double-tube double-pump design, one for one. Water protection and warning signs. Water intake control is carried out through the water level sensor, when the water level reaches the set monitoring water level, the water pump takes water, and the instrument measures. When the water level drops below the monitored water level, the meter is turned off and the intake pump stops drawing water. The integrated design of the entire system can protect itself in the event of a power outage and automatically recover when the power is turned on again.
