Midas® sensor cartridge specifications
Oxygen (O2)
MIDAS-S-O2X

Gas Measured Oxygen (O2)
Cartridge Part Number MIDAS-S-O2X 1 year standard warranty
MIDAS-E-O2X 2 year extended warranty
Sensor Technology 3 electrode electrochemical cell
Measuring Range (ppm) O2 0 – 25% v/v
Minimum Alarm 1 Set Point 5% v/v
Lower Detectable Limit (LDL) 5% v/v
Repeatability < ± 0.04% v/v
Linearity < ± 0.2% v/v
Response Time t62.5 < 10 seconds
Sensor Cartridge Life Expectancy ≥ 24 months under typical application conditions
Operating Temperature 0°C to +40°C (32°F to 104°F)
Effect of Temperature
Zero
Sensitivity < ± 0.3% of measured value / °C
Operating Humidity (continuous) 15 – 90% rH
Effect of Humidity
Zero Follows actual concentration of O2 present
Sensitivity (eg. 20.9% v/v @ 30% rH, 20.04% v/v @ 99% rH / 40°C)
Operating Pressure 70 – 110kPa
Effect of Position No effect in typical application
Long Term Drift
Zero No drift
Sensitivity < ± 2.5% of measured value / year
Calibration Gas Oxygen (O2)
Challenge Gas (Bump Test) Air mixture
Warm Up Time < 30 minutes
Storage Temperature +5°C to +25°C (+41°F to +77°F)

The sensor data listed is based on ideal test environment; observed performance may vary based on
the actual monitoring system and the sampling conditions employed

Cross Sensitivities
Each Midas® sensor is potentially cross sensitive to other gases and
this may cause a gas reading when exposed to other gases than
those originally designated. The table below presents typical readings
that will be observed when a new sensor cartridge is exposed to
the cross sensitive gas (or a mixture of gases containing the cross
sensitive species).

*Oxygen detection products must only be used to detect oxygen depletion in air

AVAILABLE MODELS:
  MIDAS-E-O2X MIDASEO2X O2X: Oxygen (two year warranty)
  MIDAS-E-NH3 MIDASENH3 NH3: Ammonia
  MIDAS-E-ASH MIDASEASH ASH: Arsine; Germane
  MIDAS-E-HCL MIDASEHCL HCL: Hydrogen chloride; others (see product page)
  MIDAS-E-HFX MIDASEHFX HFX: Nitrogen triflouride; others (see product page)
  MIDAS-E-BR2 MIDASEBR2 BR2: Bromine; Chlorine dioxide
  MIDAS-E-CFX MIDASECFX CFX: Diflouromethane; others (see product page)
  MIDAS-E-CO2 MIDASECO2 CO2: Carbon dioxide
  MIDAS-E-COX MIDASECOX COX: Carbon monoxide
  MIDAS-E-HAL MIDASEHAL HAL: Chlorine; Fluorine
  MIDAS-E-H2X MIDASEH2X H2X: Hydrogen
  MIDAS-E-HCN MIDASEHCN HCN: Hydrogen cyanide
  MIDAS-E-H2S MIDASEH2S H2S: Hydrogen sulfide
  MIDAS-E-LEL MIDASELEL LEL: Hydrogen; Methane
  MIDAS-E-NOX MIDASENOX NOX: Nitric oxide
  MIDAS-E-NO2 MIDASENO2 NO2: Nitrogen dioxide
  MIDAS-E-O3X MIDASEO3X O3X: Ozone
  MIDAS-E-PH3 MIDASEPH3 PH3: Phosphine
  MIDAS-E-SHL MIDASESHL SHL: Silane (low level)
  MIDAS-E-SHX MIDASESHX SHX: Silane; Disilane
  MIDAS-E-SO2 MIDASESO2 SO2: Sulfur dioxide
 MIDAS-E-TEO MIDASETEO TEO: Tetraethyl orthosilicate