Cables passing through 4-20mA will have loss, so there will be deviation on the value. 485 is not affected by the cable length, and 485 is the current trend.  Can be made 485 and 4~20mA two output mode.  

The difference between RTU and DTU is the same. DTU is a single and simple wireless transmission function, while RTU is a wireless acquisition and transmission equipment integrating multi-channel analog data acquisition and switching data control.  It can be understood that RTU has acquisition function and can send acquisition instructions to sensors.  DTU is only responsible for transmission, not active data collection.  

Yes, the minimum operating voltage is 9V and the maximum is 32V.

Secondary water supply mainly monitors residual chlorine, PH, turbidity and flow rate.  Scenario Secondary water supply and drinking water supply.  

There is no big requirement, it is suggested to do filtration at the intake.

Our sensor is 485 output, better integration.

At present, there are two kinds: the first kind is through the computer, PLC, EXO-202 and so on in the way of wiring to send data query instructions to the sensor, sensor response data through cable transmission to the computer, PLC, EXO-202, the response data can be converted into the test data, the computer needs software is serial debugging assistant.  The second method is to realize wireless transmission through DTU and RTU. DTU generally requires the cooperation of front-end devices. For example, DT-200 is responsible for data collection and DTU is responsible for data transmission, while RTU can realize both collection and transmission functions.  If we want to find the data from the server, we need the corresponding computer software and mobile phone software, or we can send the data to the client server, and the client can write the software to realize the data query.  

Generally less than 0.5W, real-time online.

The sensors have been calibrated from the factory and can be used directly. Some sensors need to be carried out or activated.  

The shore is relatively flat, usually the water level will not have a place.

Small size, low power consumption, anti-interference, 485 output integration.

The data can be uploaded to the client server for validation.  The DT-200 collects the data from the connected sensor and sends the data to the DTU. The DTU then sends the parsed data to the server.  The data is uploaded to the server in the following format:  

1devid:10000,ecm:1455.4,tmp:24,5,rdo:10.36,tmp:15.3,ecs:281.9,tmp:24.4,phg:3.4,tmp:28.7,nul:0,tmp:0,nul:0,tmp:0,nul:0,tmp:0,nul:0,tmp:0,nul:0,tmp:0,nul:0,tmp:0,nul:0,tmp:0,nul:0,tmp:0,end