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Model 211 Scrubberless Ozone Monitor

Dual beam ozone monitor FEM with a 30-cm pathlength. Patented gas-phase titration scrubber technology used in place of a solid-phase scrubber to minimize interferences. Ideal for ambient ozone monitoring in regions that are in non-attainment for ozone.
  • Dual beam, long path (30 cm) optical bench with high precision (< 0.5 ppb)
  • EPA Federal Equivalent Method (FEM) for compliance monitoring (EQOA–0514–215)
  • “Scrubberless” for interference-free measurement of ambient ozone

Dual beam ozone monitor FEM with a 30-cm pathlength. Patented gas-phase titration scrubber technology used in place of a solid-phase scrubber to minimize interferences. Ideal for ambient ozone monitoring in regions that are in non-attainment for ozone.

  • Dual beam, long path (30 cm) optical bench with high precision (< 0.5 ppb)
  • EPA Federal Equivalent Method (FEM) for compliance monitoring (EQOA–0514–215)
  • “Scrubberless” for interference-free measurement of ambient ozone

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Description

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 Gas-phase scrubber using NO, provided directly or by photolysis of N2O (supplied by either compressed gas cylinder or portable liquid N2O cartridge)
Linear Dynamic Range 0-2,000 ppb (0-2 ppm)
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 A at 12 V, 12 watt
Size Rackmount: 17″ w x 14.5″ d x 5.5″ h (43 x 37 x 14 cm)
Weight 14.7 lb (6.7 kg)
Data Outputs RS232, SD data card, LCD, 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, 20,000 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, ~0-25 km (pressure sensor)

Product Details

  • UV-Absorbance based ozone monitor with our patented (US Patent No. 8,395,776 B2) gas-phase scrubber technology to measure ozone virtually free of interferences
  • Ideally suited for measurements of ozone in heavily polluted air where interference is likely from particulates, mercury, or VOCs
  • Combines the stability of our proven dual beam ozone monitors with our selective scrubber technology to provide accurate ozone measurements in the most polluted air
  • The enhanced optical path length of 30 cm provides a precision of better than 0.5 ppb for 10-second measurements
  • Measurement frequency of every 2 seconds
  • Designated by the EPA as a Federal Equivalent Method (FEM): EQOA–0514–215

 

Theory Behind the Model 211’s Gas-Phase Scrubber

Conventional ozone monitors remove ozone for the Io measurement by passing the sample air flow through a solid scrubber (e.g., hopcalite or a series of metal oxide screens). Mercury and certain aromatic compounds either adsorb or react at the solid-phase scrubber surface. This causes high ozone values by up to a few ppb on highly polluted days and can cause a region to be out of compliance with the EPA’s ozone standard.
The 2B Tech Model 211 Ozone Monitor removes interferences from all UV-absorbing compounds and mercury by using nitric oxide (NO) in a GPT (gas phase titration) reaction in place of a solid-phase scrubber according to the well known reaction:   NO + O3 → NO2 + O2
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