DOS-118AX Portable Dissolved Oxygen Meter

• After-sales Service: Provided
• Warranty: Provided
• Customized: Customized
• Structure: Portable
• Material: Plastic
• Certification: CE, ISO, RoHS
• Model NO.: DOS-118AX
• Application: School, Hospital, Lab
• Type: Measurement Type
• Measure Range: 0.01μg/L~20mg/L
• Temperature: 0-50c
• Resolution: 0.01ug/L
• Accuracy: +-0.1μg/L
• Weight: 500g
• Transport Package: Carton or Wood Depends on Customer
• Specification: 164*75*17 mm
• Trademark: BOQU
• Origin: Shanghai, China
• HS Code: 90278099
• Production Capacity: 50, 000PCS

Product Description

DOS-118AX Portable Dissolved Oxygen Meter



This product adopts the polarographic measurement principle recommended by ASTM to measure trace dissolved oxygen content in water. Compared with the current similar products on the market, this product has excellent response speed and measurement accuracy. At the same time, it can measure trace to saturated gaseous oxygen content, the design of small, long battery life ensure the unique mobile measuring advantage.

Measurement Principle:
Electrochemical measurement technology has become the most widely used dissolved oxygen measurement technology, which was first invented by Dr. Leland Clark in 1956. Electrochemistry is divided into galvanic cell method and polarographic method. Polarography is the most widely used method. Based on the sensor structure, the electrochemical (polarographic) dissolved oxygen analyzer can be divided into two types: diffusion type and equilibrium type.


The sensor is composed of main components such as cathode, anode, electrolyte and semi-permeable membrane. Under the action of DC polarization voltage, oxygen dissolved in water goes through the semi-permeable membrane to the cathode for reduction reaction: O2 + 2H2O + 4e- = 4OH-
At the same time, oxidation reaction occurred at the anode: 4Ag + 4Cl- = 4AgCl + 4e-
When the reaction reaches equilibrium stability, the current formed by the electrochemical reaction has a certain relationship with the partial pressure (concentration) of oxygen: I ∞=nFA (Pm/L) Cs
When the electrode structure and thin membrane are determined, A, Pm, L and n are all constants in the formula. If K= nFA (Pm/L), then I ∞=KCs.
So you can measure the concentration of the dissolved oxygen as long as you measure the diffusion current I ∞. In order to eliminate the influence of temperature, salinity and air pressure, each model adopts its own technology to compensate. The partial pressure of dissolved oxygen in water can be calculated according to the current intensity generated by the above electrochemical process, and then the concentration of dissolved oxygen in water can be obtained according to Henry's law.
Compared with other dissolved oxygen measurement technologies, polarographic dissolved oxygen measurement technology has the characteristics of wide range of application(gaseous oxygen measurement available), high precision (especially in PPB trace level dissolved oxygen measurement applications) and mature technology. Currently, it is most popular and widely used in various dissolved oxygen measurement applications in water treatment industry.


Main Features:

• High precision: detection accuracy up to 0.10 μg/L , resolution up to 0.01 μg/L ;
• Quick response: it only takes 3 minutes for the saturation oxygen concentration in the air to reach 5 constant g/L level.
• Multipurpose: gaseous oxygen, dissolved oxygen can be measured;
• Ultra-low power consumption: 4 pieces of No.7 batteries can last for 1200 hours constantly running;
• Long service life: electrode service life of more than 5 years;
• Simple to use: it can be measured after starting up, no need for long electrode polarization;
• Easy maintenance: normal use of the electrode maintenance cycle of 4 to 8 months, membrane and electrolyte replacement easy;
• Humanized design: machine weight only 300 grams; Magnetic fit, convenient;
• High protection level: IP67;

Technical Parameters

Measuring Range	0.01μg/L~20mg/L
Accuracy	±0.1μg/L
Resolution	0.01μg/L
Response Time	T90<10S
Temperature Compensation	0-45ºC
Temperature Accuracy	0.1ºC
Compensation Function	Automatic temperature compensation, support manual input atmospheric pressure and salinity compensation
Power Supply	4 pieces of #7 batteries
Operating Condition	T:0-45ºC,Flow:160~500mL/min(keep stable)
Protection Level	IP67
Demension	164(Length)×75(Width)×17 (Height) mm
Total Weight	300g(including flow cell)

Typical Applications:
Measurement of dissolved oxygen:
Analysis of low concentration trace grade dissolved oxygen in deoxidizing water of power plant and waste heat boiler
Semiconductor chip packaging and trace oxygen monitoring for ultra-pure water process of high-end PCB
Domestic water, aquaculture water, sewage wastewater, industrial water

Measurement of gaseous oxygen:
Biological and chemical reaction oxygen concentration detection
Ambient oxygen concentration detection

Order Instructions:
1. Determine the measurement range and accuracy;
2. Determine the temperature, pressure and salinity of the measurement medium;
3. Determine the size of the sampling interface;