Portable trace dissolved oxygen analyzer SDW-OX-12BElectrochemical analysis instrument based on the principle of polarographic measurement. It can measure oxygen in gases and dissolved oxygen in aqueous solutions.Widely used in various industries such as nuclear power plants, power plants, thermal power plants, water treatment plants, industrial boilers, pharmaceuticals, medical institutions, petrochemicals, etc. across the country.

The measurement of oxygen concentration in gas (unit:%) is used for grain, fruit, medicinal material warehouses, tunnels, civil defense works, ships, as well as for measuring lung function in medicine, and for measuring oxygen concentration in the gas phase during boiler combustion in power plants, smelting, chemical industries, etc.

Dissolved oxygen (in mg/L) refers to the molecular oxygen dissolved in water or liquid phase, and its content is one of the important indicators for measuring the quality of water. The measurement of dissolved oxygen is a monitoring project for departments such as power generation, boilers, aquaculture, water source protection, water supply, and sewage treatment.

This oxygen analyzer adopts the principle of polarography and a coated oxygen electrode (also known asClark electrode). Molecular oxygen passes through the membrane from the liquid medium and enters the electrode electrolyte. Under a certain polarization voltage, oxygen is reduced, generating an electric current. The oxygen in the coated oxygen electrode undergoes the following reaction in neutral electrolyte:

Cathode O₂+2H₂O+4C=4OH

阳极 4 Ag+4CL-4e=4AgCL

The current is proportional to the oxygen concentration, and the electrolysis current is amplified and calculated by an electronic unit to display the oxygen concentration.

During the oxygen reduction process, the electrode consumes oxygen, which must be continuously supplied by the medium. Therefore, when using instruments to measure oxygen concentration, it is necessary to continuously flow the medium to ensure the accuracy and reliability of the measurement.

Main technical parameters of portable dissolved oxygen

1. Instrument measurement range:

F_I(0-20) mg/L resolution 0.01 mg/L

G_I(0-20) mg/L resolution 0.001 mg/L

H_Ⅰ(0-20) mg/L resolution 0.0003 mg/L;

H_B(0-20) mg/L resolution 0.0001 mg/L

2. Instrument indication error:

F_I±0.3mg/L

G_Ⅰ±0.04mg/L

H_Ⅰ±0.008mg/L

H_B±0.008mg/L

3. Instrument repeatability:

F_I≤0.14mg/L

G_I≤0.014mg/L

H_Ⅰ≤0.003mg/L

H_B≤0.003mg/L

4. Instrument response time:

Not exceeding 30 seconds (90%, 25 ℃)

5. Instrument zero value (error):

（0.00-20）mg/L ≤0.10 mg/L

（0.000-1.999）mg/L ≤0.01 mg/L

（.0003-.1999）mg/L ≤0.001 mg/L

（.0000-.1999）mg/L ≤0.001 mg/L

6. Instrument working conditions:

a) Environmental temperature: (5-35) ℃.

b) Relative temperature: not exceeding 85% RH.

c) Power supply: DC (9-8.5) V.

d) Temperature of the tested medium: (5-40) ℃.

e) There should be no electromagnetic interference that affects the normal operation of the instrument.

f) Atmospheric pressure: (86-106) kPa.

g) The power environment and air circulation are good, and there are no interfering gases that affect the detection accuracy.

7. The impact of changes in power supply voltage: one-fifth of the instrument reading error.

8. Impact of environmental temperature changes: two-thirds of the instrument reading error.

9. Oxygen electrode lifespan: greater than one year.

10. Power consumption:<2mW.

11. Dimensions: 25 × 80 × 145mm.

12. Weight: 250g.

Main technical parameters of gas oxygen analysis

1. Instrument measurement range:

C1-CIV （0.0-95.0）%;

（0.00-19.99）%

B1 （0.000-1.999）%

A1 （0.0000-.1999）%

2. Instrument indication error

（0.0-95.0）% ±3%F.S

（0.00-19.99）% ±2%F.S

（0.000-1.999）% ±2.0%F.S

（0000-.1999）% ±4.0%F.S

3. Instrument repeatability

（0.0-95.0）% ≤1.0%

（0.00-19.99）% ≤1.0%

（0.000-1.999）% ≤1.0%

（.0000-.1999） % ≤2.0%

4. Instrument zero drift and range drift

（0.0-95.0）% ±1%F.S

（0.00-19.99）% ±0.67%F.S

（0.000-1.999）% ±0.67%F.S

（.0000-.1999）% ±1.33%F.S

5. Instrument response time:

Not exceeding 30 seconds (90%, 25 ℃)

6. Residual current of the instrument ≤ 1.0% F.S

7. Instrument working conditions:

a) Environmental temperature: (5-35) ℃.

b) Relative humidity: not exceeding 85% RH.

c) Power supply: DC (9-8.5) V.

d) Temperature of the tested medium: (5-40) ℃.

e) There should be no electromagnetic interference that affects the normal operation of the instrument.

f) Atmospheric pressure: (86-106) kPa.

g) The power environment and air circulation are good, and there are no interfering gases that affect the detection accuracy.

8. The impact of changes in power supply voltage: one-fifth of the instrument reading error.

9. Impact of environmental temperature changes: two-thirds of the instrument reading error.

10. Oxygen electrode lifespan: greater than one year.

11. Power consumption:<2mW.

12. Dimensions: 25 × 80 × 145mm.

13. Weight: 250g.

High precision portable trace dissolved oxygen analyzerSDW-OX-12ASelection reference

type	model	Instrument name	measurement range	purpose
online	SDW-OX-12A F2	Installation type dissolved oxygen meter	0.01mg/L-20.0mg/L （溶氧）(0.0-80)%O2（气氧）	Monitoring of dissolved oxygen content in water from water treatment equipment plants, industrial boilers, etc
online	SDW-OX-12A G2	Installation type high-sensitivity dissolved oxygen analyzer	0.001mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in condensate water, deaerator water, and provincial gas water from nuclear power plants, power plants, and thermal power plants
online	SDW-OX-12A-H2	Installation type high-sensitivity dissolved oxygen analyzer	0.0003mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in condensate water, deaerator water, and provincial gas water from nuclear power plants, power plants, and thermal power plants
online	SDW-OX-12A-H3	Installation type high-sensitivity dissolved oxygen analyzer	0.0001mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in condensate water, deaerator water, and provincial gas water from nuclear power plants, power plants, and thermal power plants
portable	SDW-OX-12B F1	Portable dissolved oxygen analyzer	0.01mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in water from water treatment equipment plants, industrial boilers, etc
portable	SDW-OX-12B G1	Portable high-sensitivity dissolved oxygen analyzer	0.001mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in condensate water, deaerator water, and provincial gas water from nuclear power plants, power plants, and thermal power plants
portable	SDW-OX-12B-H1	Portable high-sensitivity dissolved oxygen analyzer	0.0003mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in condensate water, deaerator water, and provincial gas water from nuclear power plants, power plants, and thermal power plants
portable	SDW-OX-12B-HB	Portable high-sensitivity dissolved oxygen analyzer	0.0001mg/L—20.0mg/L（溶氧）(0.0—80)%O2（气氧）	Monitoring of dissolved oxygen content in condensate water, deaerator water, and provincial gas water from nuclear power plants, power plants, and thermal power plants