4-20mA Aeration Control Online Dissolved Oxygen Controller

In sewage treatment, the energy required for aeration accounts for about 60% of the total energy consumption. Under the increasingly stringent safety regulations, controlling the energy consumption during the aeration process is the key to energy saving in factories. Some survey results show that electricity can be saved when controlling air volume using dissolved oxygen as an indicator. Therefore, air volume control through high-precision monitoring and maintenance of dissolved oxygen concentration is a significant energy-saving method for aeration systems. For factories, a set of online dissolved oxygen analyzers with fast response and low equipment maintenance costs are crucial to saving energy consumption. It is relatively common to use aerobic microorganisms to treat industrial wastewater, and aerobic microorganisms must decompose organic matter into carbon dioxide, water, and nitrates under aerobic conditions. In the activated sludge process for treating industrial wastewater, the amount of dissolved oxygen (DO) is usually measured to appropriately adjust the oxygen of microorganisms. Generally, industrial wastewater does not contain dissolved oxygen and is often aerated with the help of various aerators to supply oxygen to microorganisms. The role of dissolved oxygen not only provides the formation of activated sludge, but also provides the oxidation of cell materials themselves and the metabolism of microorganisms to oxidize and decompose organic matter. When treating industrial wastewater using the activated sludge method, the dissolved oxygen in the aeration zone is generally controlled at 2-4 mg/L. Dissolved oxygen that is too high or too low will affect the metabolism of microorganisms and reduce the water treatment effect. The dissolved oxygen in the anaerobic tank of sewage treatment is controlled below 0.2mg/L, the dissolved oxygen in the anoxic tank is controlled at 0.2~0.5mg/L, and the dissolved oxygen in the aerobic tank is controlled at 2~4mg/L. Dissolved oxygen control in anoxic tanks can be controlled by adding a stirring device, controlling backflow or installing an appropriate aeration device. The DUC2-DO online Dissolved Oxygen Controller developed and produced by Daruifuno has 2 settable multi-function relays and 2 4-20mA current outputs, which can accurately control aeration.

Features
Waterproof and air-sealed housing, suitable for harsh working conditions, protection grade IP66
Large backlit LCD displays DO value, temperature, time and relay status
Dissolved oxygen controller has 2 channels of 4-20mA current output, RS485 protocol
2-way multi-function relay with control of measured value, temperature value and cleaning function
Electronic clock and historical data recording function, can record 10,000 data
Default English language, rich menu operation functions

Specification

Product Name	Dissolved Oxygen Meter
Product Model	DUC2-DO
Display Range（DO）	0-50mg/L (or ppm), unit can be switched
Display Range（Saturation）	0-400%
Display Range（TEMP）	-10～500℃ /14~932℉
Resolution	0.01mg/L   1%   0.1℃/0.1℉
Salinity Compensation Range	Input range 0.0001-99999ppt
Relay Control	2 settable SPST relays with a maximum load of 3A/250VAC
Analog Current Output	2 settable 0/4~20mA current outputs, max load 1000Ω
Communication Method	RS485 interface; MODBUS RTU
Display Screen	128*64 LCD, adjustable backlight mode, adjustable display rate
Time/Data Record	Record 10000 historical data
Maintenance Records	Last 100
Operating Temperature	0～60℃，RH<95% ( no condensation)
Shell Material	Enhanced ABS
Protection Grade	IP66
Dimension	144*144*120mm
Mounting Method	Wall mounting, pipe clamping, panel (hole size 138*138 mm)
Power Supply	100~240V AC or 18~36V DC, 50/60Hz