| 1： In the monitoring of environmental pollution and investigation of water pollution, it is necessary to truthfully reflect the water quality pollution situation. Representative water samples must be collected. Especially in the current situation where legislation and economic measures are used to improve environmental management, it is even more important to determine the methods and correctness of collecting representative water samples in water resource protection work. However, the quality and quantity of wastewater discharged by factories often undergo significant changes in a short period of time, and domestic wastewater also changes with people's living habits and seasonal changes. Therefore, the overall pollution situation of water bodies and rivers is very complex. And our previous sampling tools have always been relatively outdated manual operations. Large workload and poor accuracy. The water quality automatic sampler is a flow function container and electronic instrument specially equipped for four commonly used measuring weirs in drainage engineering, to collect representative water samples. This instrument can be used for water quality sampling at factory wastewater discharge outlets, fixed water quality monitoring points in rivers, and other locations. It is an advanced sampling and measuring tool. 2： The instrument structure is 778 type, mainly composed of the following components: (1) Sampling controller: installed indoors, mainly used to set sampling time and sampling work. (2) Bracket, support rod, sampling motor: installed in outdoor water tank 3： Usage method (1) Install the bracket and support rod at the outdoor water sampling point according to the diagram, and then install the sampling motor on the support rod. Adjust the position of the sampling motor according to the height of the water surface (note: the sampling motor cannot be fully immersed in water, only below the disc can be immersed in water). (2) Connect the sampling water pipe from the sampling outlet and connect another section to the laboratory's water bottle. (3) Connect the power cord of the sampling motor to the indoor sampler host. (4) Connect the power to the host, set the sampling time, and it can start working. (5) The steps for setting the sampling time are as follows. 4： Sampling time setting: Adopting imported single-chip integrated circuit design, the peripheral circuit is simple, low power consumption, high reliability, and can be set up to 40 times a day. There are three sampling options, and the sampling time can be set freely. Two days can be set as rest days within a week to automatically stop sampling. Built in rechargeable battery and automatic trickle charging, eliminating the hassle of battery replacement. Has fast simulation function; The use of high-frequency crystal oscillators ensures precise timekeeping and is currently the most advanced fully automatic time control instrument. Main technical indicators: 1. Power supply voltage: AC 220V, DC 12V 2. Frequency: 50Hz 3. Sampling frequency per day: 20 times 4. Sampling methods: 3 types 5. AC load power: resistive 1000W 6. Zui small programming interval: 1 minute 7. Sampling time: 0-99 seconds 8. Size: 260 * 150 * 80 (mm) | 
