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Oxygen is a colorless gas that makes up 21 percent of Earth's atmosphere. It is also odorless and used in the industrial world for steel production and the production of many chemicals. Monitoring oxygen levels within the workplace is important because oxygen can be dangerous if too much or too little is present. Oxygen has approximately the same density as air, 1,354 kg/m3. OSHA defines the minimum safe concentration of oxygen as 19.5%, and the maximum safe level as 23.5%.

PemTech has multiple product lines of gas detectors specifically designed to monitor oxygen levels. Our Ultra 1000 Series Toxic & Gas Detector is a 24 VDC gas detector in a flameproof enclosure with a 316 stainless steel sensor head assembly. PemTech’s Ultra 1000 oxygen sensor is part of our deluxe line because it comes with three programmable alarm relays. The response time (T90) for our oxygen sensor is less than 15 seconds.

Chemical FormulaO2
Detection TechnologyElectrochemical
Relative Density (vs. Air)Same as Air (1.354 kg/m3)
CombustibleNo
LEL (% by Vol)--
TWA--
STEL--
PEL--
Areas of Application
  • Fruit storage areas
  • Greenhouse & Storage areas
  • Confined space
  • Research labs
  • Engine testing
  • Manufacturing, polymer / plastic
  • General Leak detection in process manufacturing
  • Refrigeration & Cold storage facility
  • Underground construction
  • Buildings and research and facility
  • Blast furnace operation

Gas Detector Model

PEL - A Permissible Exposure Limit (PEL) is the maximum amount or concentration of a chemical that a worker may be exposed to under OSHA regulations.

STEL - A Short-Term Exposure Limit (STEL) is the acceptable average exposure over a short period of time, usually 15 minutes as long as the time-weighted average is not exceeded. STEL is a term used in occupational health, industrial hygiene and toxicology.

TWA - Time Weighted Averages are an average value of exposure over the course of an 8 hour work shift.