Online DO Controller

The online dissolved oxygen meter is an online intelligent dissolved oxygen detector produced by our company with foreign technology. It adopts imported components and dissolved oxygen film heads, based on the latest polarographic analysis technology, advanced production technology and surface mount technology. This series of advanced analytical techniques is used to ensure the long-term stability and reliability of the instrument. It has Chinese menu operation, notebook storage measurement data, 485 communication and other functions. Can be widely used in chemical fertilizer,metallurgy, environmental water treatment engineering, pharmaceutical, biochemical, food, aquaculture and tap water and other solutions in the continuous monitoring of dissolved oxygen values.
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Product Details

online DO meter + probeFeature:

1. The large LCD display, English menu operation.
2.Multi-parameter display at the same time: the value of dissolved oxygen,temperature, output current, alarm points, etc. Intuitive and easy to read, and alarm for range over run.
3.Screen displays alarm status and accompanied by a switch ON / OFF signal output
4.Automatic Temperature Compensation: Automatic 0℃ to 60℃
5.Communication function (optional): RS-485 communication interface(MODBUS protocol is partially compatible), 4 to 20 mA current output corresponding to the DO value can be set freely.
6.Notepad: can store 50 measurements, the user can record measurement data.
7.Hysteresis amount can be set freely to avoid frequent switching relay action
8.Watchdog function: to ensure that the instrument will not crash
9.Core devices from famous foreign brands
10.Restore the factory settings. Power-down protection> 10 years


Technical parameters:

Model No.

Test Item

Test range




Dissolved oxygen

0-20.00 mg/L







Other parameters:

Automatic temperature compensation: 0~60°C
Control Interface: two sets of ON / OFF relay contacts, 
divided into the high point, low alarm signal, optically isolated output.
Isolated signal output: Optocoupler isolation to protect , 
4~20mA signal output
Relay: relay lag set freely,  
the relay load 10A 220VAC
Working conditions: ambient temperature of 0~60°C, 
relative humidity <= 90%
Output load: load <500Ω (0-10mA),
load <750Ω (4-20mA)
Working voltage: 220V AC, 50/60Hz
size:96 x 96 x 115 mm
Hole size: 91 x 91mm
Weight: 0.9Kg

DO online controller


About Do 

DO: Oxygen saturation (symbol SO2) is a relative measure of the concentration of oxygen that is dissolved or carried in a given medium as a proportion of the maximal concentration that can be dissolved in that medium. It can be measured with a dissolved oxygen probe such as an oxygen sensor or an optode in liquid media, usually water. The standard unit of oxygen saturation is percent (%).

About us

Founded in 2008, Hangzhou Lohand Biological Technology Co., Ltd. Is a company that designs, develops, produces and sells water quality rapid test strips, reagents and precision testing instruments. It is located in Jianggan Science and Technology Park and relies on Zhejiang University Food Science and Technology Park and the West lake Science and Technology Park, focusing on technological innovation, has obtained a number of patents and produces provide customers with professional, fast, affordable and simple testing products and services to create a new history of water quality monitoring.

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