2BTech model 202 | EMS
2BTech model 202

Ozone monitor

The Model 202 Ozone Monitor is designed to enable accurate and precise (±1.5 ppb) measurements of ozone ranging from a few ppb to 100,000 ppb (0-100 ppm) based on the well-established technique of UV absorbance at 254 nm. The Model 202 is light weight (2.1 kg.) and has a power consumption of only 4 watts. The Model 202 has been certified by the EPA as a Federal Equivalent Method (FEM): EQOA-0410-190 The Model 202 has been used for the past decade in ozone monitoring networks of the U.S. National Park Service and National Forest Service. It also is widely used by NOAA, EPA, Environment Canada and the British Antarctic Survey for studies of ground-level ozone.
Measurement PrincipleUV Absorption at 254 nm
Federal Equivalent Method (FEM)Yes, EQOA-0410-190
Linear Dynamic Range1.5 ppb to 250 ppm
Resolution0.1 ppb
Precision (1σ; rms noise)Greater of 1.5 ppb or 2% of reading
AccuracyGreater of 1.5 ppb or 2% of reading
Limit of Detection (2σ)3.0 ppb
NIST-Traceable CalibrationYes
Measurement Interval 10 s (Data averaging options: 10 s, 1 min, 5 min, 1 hr)
Flow Rate (nominal)~1 Litre/min
Flow Rate Requirement>0.6 L/min
Baseline Drift< 2 ppb/day < 5 ppb/year
Sensitivity Drift< 1%/day < 3%/year
Measurement Time, Frequency10 s, 0.1 Hz
Response Time, 100% of Step Change20 s, 2 points
Averaging Times10 s, 1 min, 5 min, 1 hr
Data Logger Capacity14,336 lines (10 s avg. = 1.4 days; 1 min avg = 10 days; 5 min avg = 1.4 mo; 1 hr avg = 1.6 yr)
Ozone Unitsppb, ppm, pphm, µg m-3, mg m-3
Pressure Unitsmbar, torr
Temperature Units°C, K
T and P Corrected Yes
Operating Temperature Range0 to 50 °C; -20 to 50 °C with low temperature modifications (rotary vane pump and lamp heater)
Operating Altitude Range~0-13.5 km (150-1,013 mbar) standard; ~0-25 km (30-1,013 mbar) with upgraded pressure sensor
Power Requirement; Supplied by battery or 110/220 VAC Power Pack12 V dc or 120/240 V ac, 335 mA, 4.0 watt (2.9 watt with cell heater unplugged)
Size3.5 x 8.5 x 11 inches (9 x 21 x 29 cm)
Weight4.7 lb (2.1 kg); 1.6 lb (0.7 kg) without instrument case
Analog Inputs for Internal Logging of Other Instruments3 Analog Inputs, 0-2.5 V; For example could log external T, P and RH
Data OutputsRS232, 0-2.5 V Analog, LCD Display: (Optional 4-20 mA Current, External USB Converter; request quote)
Data Transfer Baud Rates1200, 2400, 4800, 19200
Output RangesUser Defined Scaling Factor in Menu
Backup Air Pump Yes
Flow MeterYes
OptionsGPS, Flash Card Memory, 4-20 mA Current Output; Lamp Heater; Rotary Vane Air Pump; Long-Life External Air Pump; Rack Mount Case
Upgradable to Model 205 Dual BeamYes

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