oxygen transmitter

Part number: ESCM-37 and ESCM-38

ESCM-37 Oxygen DetectorEdaphic Scientific provides an oxygen sensor and transmitter for HVAC controllers or BMS units. The ESCM-37 is a long life 0-25% or ESCM-38 0-95% oxygen level transmitter that provides multiple analog linear outputs of O2 concentrations. It is designed to be rugged, maintenance-free and can be calibrated in normal air of any known oxygen concentration. Outputs include voltage and 4..20mA. Multiple units may be daisy chained for via RS485. The base address for each sensor is selected via on board jumper.

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Download ESCM-37-38-Oxygen-Transmitter Spec Sheet

Download ESCM-37-38-Oxygen-Transmitter Manual



  • CO2Meter ESCM-37 InternalMeasure up to 25% or 95% Oxygen Levels Accurately
  • Non-Consumptive Technology – Does Not “Wear Out”
  • Automatic or Manual Calibration
  • Calibrate in Room Air or any Know O2 Concentration
  • 0-10V, 4-20mA or RS485 Output


  • Measurement Range: ESCM-37: 0-25% ; ESCM-38: 0-95%
  • Sensing Method: Zirconium dioxide (ZrO2)
  • Sampling Method: Diffusion
  • Diffusion Response Time: 4 seconds max diffusion time
  • Sensitivity: ± 20 ppm ± 1 % of measured value
  • Accuracy: 2% full scale
  • Pressure Range: 2 to 3,000 mbar


  • Power Input: 24VDC ±10%
  • Current Consumption: 600 mA @ 24VDC
  • Dimensions: 4.72 x 3.15 x 3.15 inches
  • Analog: Linear 2-10V or 4-20mA
  • Digital: RS485


  • Sensor: 1 Year, Electronics: 1 Year