Mainly include: blood standard gas, brain circulation standard gas, lung diffusion standard gas
Blood gas measurement: CO2 5~10%/N2
CO2 5% O2 10~20%/N2
He 9~13%/N2
N2 6~8%/O2
Brain circulation： CO2 5~10%/Air
Lung diffusion： CO 0.2% He 10%/Air
How to ensure the stability of standard gases:
PUREGAS
Great efforts have been made in the following areas to ensure the quality of the standard gas and make it a veritable standard substance:
raw material
Since the standard gas is a standard material for gas, the requirements for the material gas are particularly high. All standard gases of PUREGAS use the highest level of raw material gas from the binary channel.
device
Precisely formulated with an automated gas premix system to effectively reduce the effects of human factors
Container selection
The container containing the standard gas is made of a material resistant to corrosion, compression, less adsorption, no rust, stable chemical properties, and high mechanical strength. The commonly used high-pressure vessel is an aluminum alloy bottle, and the carbon steel bottle is not smooth due to its inner wall. The adsorption is large and completely eliminated.
Pretreatment
The cylinder containing the standard gas is cleaned and painted before use. Then, the cylinder is heated to about 100 °C and vacuumed for about 4 hours. After the cylinder is finished, it must be analyzed for the content of impurities such as H2O and O2.
