Portable gas oxygen analyzer in Qingdao, Shandong | Measuring oxygen content in 99.99% nitrogen gas

Handheld gas oxygen meter

Measure the oxygen content in 99.99% nitrogen gas

DOS-118BportableGas measurementoxygenceremony

DOS-118BA portable oxygen analyzer based on the principle of pedigree measurement for electrochemical analysis. It can measure oxygen in gases and dissolved oxygen in aqueous solutions.

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

Main technical parameters of gas oxygen

1Instrument measurement range:

C1-CIV（0.0-95.0）%;

（0.00-19.99）%

B1（0.000-1.999）%

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%

（0.00-19.99）%≤1%

（0.000-1.999）%≤1%

（.0000-.1999）%≤2%

4.Instrument zero drift, 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 greater than30s (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 greater than85%RH.

c）Power supply:DC(9-8.5)V.

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

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

9Oxygen electric lifespan: greater than years.

10Power consumption:＜2mW.

11External dimensions:25×80×145mm.

12Weight:250g.

The DOS-118B gas oxygen analyzer adopts the principle of spectral method and membrane oxygen measurement (also known as membrane oxygen meter)ClarkElectricity). Molecular oxygen enters the electrolyte through a membrane from a liquid medium, and at a constant oxidation voltage, oxygen is reduced to generate an electric current. The oxygen in the film coated oxygen electrode undergoes the following reaction in neutral electrolyte:

yinO₂+2H₂O+4C=4OH

sun4Ag+4CI-4e=4AgCI

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.

In the process of oxygen reduction, electricity 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.

Calculation of oxygen content in air with a constant temperature:

Or =（101.3- P_t⁰×RH）×20.95/101.3

Where:Or-The oxygen content of air with a constant temperature（%）；

101.3-Standard atmospheric pressure（760mgHg）（Pa）；

P_t⁰-Saturated water vapor pressure at constant temperature (see table)3）（Pa）；

20.95-Oxygen content in dry air（%）

Note:1 mmHg = 0.1333 paor1 more = 7.5025 mmHg.