Home Items Model 211-G Ozone Monitor

Model 211-G Ozone Monitor

Dual beam ozone monitor. EPA-certified Federal Equivalent Method (FEM) with a 30-cm path length and a heated graphite scrubber in place of the traditional catalytic carbon scrubber. Ideal for monitoring applications in non-attainment regions and in heavily polluted air where interferences are likely from particulates, mercury, and/or volatile organic compounds.

  • Heated graphite scrubber virtually eliminates interferences in the ozone measurements produced by this instrument
  • Measurement range of 0-500 ppb with 0.5 ppb precision
  • FEM designated for regulatory compliance monitoring in accordance with the Clean Air Act (modification to EQOA-0514-215)


  • UV Absorbance-based ozone monitor with our patented heated graphite scrubber technology (U.S. Patent No. 10,295,517) to measure ozone virtually free of interferences
  • Ideally suited for measurements of ozone in heavily polluted air where interferences are likely from particulates, mercury, and/or VOCs
  • Enhanced optical path length of 30 cm provides a precision of better than 0.5 ppb for 10-second measurements
  • Output new ozone measurements as often as every 2 seconds
  • Designated by the EPA as a Federal Equivalent Method (FEM) as a modification to our Model 211 Scrubberless Ozone Monitor:  EQOA-0514-215
  • Our paper published in Atmospheric Measurement Techniques describes the heated graphite scrubber
  • Has the potential to bring many regions into compliance with the new national ambient air quality standard simply by making a more accurate measurement
  • Measurement of ambient ozone with greatly reduced susceptibility to interferences from other UV-absorbing species such as aromatic VOCs and mercury
  • Dual beam, long path (30 cm) optical bench with high precision (< 0.5 ppb)
  • DewLine™ for elimination of water vapor interference, a unique feature of 2B Tech instruments
  • SD flash memory for virtually unlimited portable data storage
  • Internal long-life sample pump (15,000 hours)
  • EPA Federal Equivalent Method (FEM) for compliance monitoring (EQOA–0514–215)
  • Convenient user interface, including remote operation via RS-232 communication
  • NIST-traceable calibration (calibration suggested annually)
  • Model 211-G Ozone Monitor
  • 2.5A power adapter
  • Serial port cable (9PinF-9PinF)
  • External ozone scrubber
  • Hex ball driver (7/64″)
  • SD card and SD card reader
  • USB flash drive preloaded with operation manual and other useful documentation
  • NIST-traceable calibration certificate
  • External lithium-ion battery (not included with standard purchase)
  • External particle filter
  • Cold-weather upgrade  (-20 to 50°C)
  • Bluetooth upgrade for wireless data transmission
  • 4-20 mA analog output upgrade
  • Serial-to-USB adapter (not included with standard purchase)
  • High-altitude upgrade (allows operation up to ~25 km)
  • Coming Soon! Stay Tuned!


Spec Sheet
Measurement Principle UV Absorbance at 254 nm; Dual Beam
Federal Equivalent Method (FEM) Yes, 0-500 ppb for 20-30°C: EQOA–0514–215
Ozone Scrubber Technology Heated graphite scrubber (U.S. Patent No. 10,295,517)
Linear Dynamic Range 0-500 ppb
Resolution 0.1 ppb
Precision (1σ rms noise) Greater of 0.5 ppb or 1% of reading for 10-s average
Accuracy Greater of 1.0 ppb or 2% of reading
Limit of Detection (2σ) 1.0 ppb for 10-s average
NIST-Traceable Calibration Yes
Flow Rate (nominal) ~2 Liter/min
Flow Rate Requirement >1.2 L/min
Baseline Drift < 1 ppb/day
< 3 ppb/year
Sensitivity Drift < 0.5%/day
< 3%/year
Response Time, 100% of Step Change 20 s for 10-s averaging; 4 s for 2-s measurement
Measurement and Averaging Times 2 s, 10 s, 1 min, 5 min, 1 hr
Internal Data Logger Capacity 16,383 lines (10-s avg. = 1.9 days; 1-min avg = 11 days; 5-min avg = 1.9 mo;
1-hr avg = 1.9 yr)
SD Card Logger Capacity Minimum 2 GB (> 5-year capacity for 10-s measurement mode)
Ozone Units ppb, ppm, pphm, µg m-3, mg m-3
Pressure Units mbar, torr
Temperature Units °C, K
T and P Corrected Yes
Operating Temperature Range 10 to 50 °C
Operating Altitude Range ~0-13.5 km (150-1,013 mbar) standard; optional ~0-25 km (30-1,013 mbar) with upgraded pressure sensor
Power Requirement;
Supplied by Battery or 110/220 VAC Power Pack
11-14 V dc or 120/240 V ac, 1.8 A at 12 V, 22 watt
Size Rackmount: 17″ w x 14.5″ d x 5.5″ h (43 x 37 x 14 cm)
Weight 13.4 lb (6.1 kg)
Data Outputs LCD, RS232, SD data card, 0-2.5 V Analog, optional 4-20 mA Analog
Data Transfer Baud Rates 2400, 4800, 19200
Output Ranges User-Defined Scaling Factor in Menu
DewLine™ Yes
Long-Life Pump Yes, 15,000 hr
Flow Meter Yes
Options Battery; External Particle Filter; Bluetooth; External Serial-to-USB Adapter; 4-20 mA Current Output; Lamp Heater; High-Altitude Upgrade, ~25 km (pressure sensor)


Call Us

+1 (303) 273-0559

Case Studies

Case Studies for this product are coming soon!
"2B Technologies is a Professional manufacturer with excellent service, a company we can trust!"
Anonymous Customer Feedback

2B Tech Annual Customer Service Feedback Survey

Related Products