Where to buy oxygen detectors

Where can I buy oxygen detectors? Looking for Ben An in Jinan, Shandong.
Jinan Benan Technology Development Co., Ltd. is a manufacturer specializing in the production of oxygen detectors, oxygen alarms, oxygen detectors, oxygen detectors, oxygen detectors, and oxygen leak alarms
We all know What we breathe in life is oxygen. Supposedly, oxygen should not be dangerous, but in fact, too high or too low oxygen concentration can cause harm to our lives. Oxygen concentration (volume) signs (under atmospheric pressure)
Fatal / minute (absolutely airtight environment, such as hyperbaric oxygen chamber or deep water)
Fatal / ~ minutes can be cured after treatment (absolutely airtight environment, such as hyperbaric oxygen chamber)
3. Oxygen enrichment
. Oxygen The concentration is normal
. Minimum allowable concentration of oxygen
~ Reduces work efficiency and can cause problems with the head, lungs and circulatory system
~ Shortness of breath, loss of judgment, blue lips
~ Loss of intelligence, fainting, unconsciousness, pale face, purple lips, nausea and vomiting
~ Minutes
~ Convulsions within seconds, respiratory arrest, death
Main parameters of oxygen detector:
Certification
◆ Tianjin
◆ Ministry of Public Security: Fire Products Conformity Assessment Center
◆ Application standards:.,
Electrical
◆ Power supply: 3
◆ Maximum power
◆ Signal output: bus
◆ Terminal: Terminal, suitable for wire cross-section.~
◆ Accuracy:
◆ Repeat rate:
◆ Detection principle : Catalytic combustion type, electrochemical type, infrared type
◆ Response time:
Catalytic combustion type: less than
Electrochemical type: less than
Infrared type: less than
Environment
◆ Grade:
◆ Working temperature: -℃ ~ ℃
◆ Humidity range: ~
◆ Pressure range: ~
◆ Storage temperature: -℃~+℃