2Btech model 205 | EMS
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2Btech model 205

Dual beam ozone monitor

The Model 205 Dual Beam Ozone Monitor™ was designed for even higher precision and faster response time than our popular Model 202. Data may be output as frequently as every 2 s, making it ideal for vertical profiling using balloons or aircraft measurements where high temporal resolution is required. For a given averaging time, the Model 205 has a higher precision (better than 1 ppb for 10 s averaging) and a more stable baseline than the Model 202. The Model 205 has all of the features of the Model 202 single beam instrument, including a real time clock; averaging times of 10 s, 1 min, 5 min and 1 h; an internal data logger; serial and analog data outputs; and a backup air pump to protect against data loss in the field. The Model 205 Ozone Monitor has been designated as a Federal Equivalent Method (FEM) by the EPA.
Measurement PrincipleUV Absorption at 254 nm; Dual Beam
Federal Equivalent Method (FEM)Yes, EQOA-0410-190
Linear Dynamic Range0 to 250 ppm
Resolution0.1 ppb
Precision (1σ rms noise)Greater of 1.0 ppb or 2% of reading for 10-s average
AccuracyGreater of 1.0 ppb or 2% of reading
Limit of Detection (2σ)2.0 ppb for 10-s average
NIST-Traceable CalibrationYes
Measurement Interval2 s (Data averaging options: 10 s, 1 min, 5 min, 1 hr)
Flow Rate (nominal)~1.8 Liter/min
Flow Rate Requirement>1.2 L/min
Baseline Drift< ppb/day <3 ppb/year
Sensitivity Drift< 1%/day <3%/year
Measurement Time, Frequency2 s, 0.5 Hz
Response Time, 100% of Step Change4 s, 2 points
Measurement and Averaging Times2 s, 10 s, 1 min, 5 min, 1 hr
Data Logger Capacity16,383 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, pphm, ppm, µg m-3, mg m-3
Pressure Unitsmbar, torr
Temperature Units°C, K
T and P CorrectedYes
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, 415 mA, 5.0 watt (3.9 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 Rates2400, 4800, 19200
Output RangesUser-Defined Scaling Factor in Menu
Backup Air PumpYes
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

20 The Boulevard

Grange Rath


Co Meath, A92 RY72



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