Product Overview

Model 205 Dual Beam Ozone Monitor Overview

EPA Federal Equivalent Method (FEM)

The Model 205 Dual Beam Ozone Monitor makes use of two detection cells to improve precision, baseline stability, and response time. In the Dual Beam instrument, UV light intensity measurements Io (ozone-scrubbed air) and I (unscrubbed air) are made simultaneously. Combined with other improvements, this made it possible to reduce the time between ozone measurements to 2 seconds, making our instrument the fastest UV-based ozone monitor on the market, while still retaining the small size, weight, and power requirements of our popular Model 202 Ozone Monitor. Fast measurements are especially desirable for aircraft and balloon measurements where high spatial resolution is needed. For 10-s averaging, a precision of 1.0 ppb is achieved. Alternatively, one can choose to average more points internally to obtain even better precision. Flash card memory and a long-life, quiet internal air sampling pump are now standard on the instrument. The Model 205 Dual Beam Ozone Monitor has been approved by the EPA as a Federal Equivalent Method (FEM) based on a modification of the Model 202

Features

Quiet long-life internal air pump
Low power consumption (~8 watt)
Internal data logger (EEPROM), logs 16,383 lines of data
Real-time clock
Both serial and user-scalable analog voltage outputs (4-20 mA current output optional)
Flash card memory (SD card) for virtually unlimited, portable data storage
Three 0-2.5 VDC analog inputs for logging other measurements, such as external temperature, pressure, and humidity
Convenient user interface to microprocessor, including calibration parameters (gain and zero)
Selectable measurement time of 2 s or data averaging times of 10 s, 1 min, 5 min and 1 hr (custom averaging times available)
DewLine™ for elimination of any water vapor interference, a unique feature of 2B Tech instruments
Dual beam feature allows for heightened precision and improved baseline stability for applications where high spatial resolution is required.

Options

GPS for continuous logging of latitude, longitude, and altitude (for 10-s data mode and above)
Rechargeable lithium-ion battery provides 12 hours of continuous operation
External particle filter
Serial-to-USB adapter
4-20 mA analog current output
Bluetooth for wireless data transmission
Low-temperature package for operation to -20 degrees C (pump, lamp heater)
High-altitude upgrade (pressure sensor for use up to 25 km altitude)
Extra long-life, low temperature internal air pump
Low-power option for even lower power consumption
Rack-mount case configuration

What Is Included?

Model 205 Dual Beam Ozone Monitor
Quiet, Long-Life Internal Air Pump
AC Power Adapter (100-240 VAC to 12 VDC) with Country-Specific Plug
Cigarette Lighter Adapter
Battery Wire Connector
Zeroing Cartridge
Flash Card Memory for virtually unlimited, portable data storage
SD Card (> 2 GB) and SD Card Reader
Operation Manual on USB Stick
Calibration Data and NIST-Traceable Calibration Certificate
Instrument Birth Certificate
One-Year Warranty

Specifications
Measurement Principle	UV Absorption at 254 nm; Dual Beam
Federal Equivalent Method (FEM)	Yes, EQOA-0410-190
Linear Dynamic Range	0 to 250 ppm
Resolution	0.1 ppb
Precision (1σ rms noise)	Greater of 1.0 ppb or 2% of reading for 10-s average
Accuracy	Greater of 1.0 ppb or 2% of reading
Limit of Detection (2σ)	2.0 ppb for 10-s average
NIST-Traceable Calibration	Yes
Measurement Interval	2s (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	< 1 ppb/day < 3 ppb/year
Sensitivity Drift	< 1%/day < 3%/year
Measurement Time, Frequency	2 s, 0.5 Hz
Response Time, 100% of Step Change	4 s, 2 points
Measurement and Averaging Times	2 s, 10 s, 1 min, 5 min, 1 hr
Ozone Units	ppb, pphm, ppm, µg m^-3, mg m^-3
Pressure Units	mbar, torr
Temperature Units	°C, K
T and P Corrected	Yes
Operating Temperature Range	0 to 50 °C standard; optional -20 to 50 °C with low temperature modifications (pump and lamp heater cold-weather package)
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	12 V dc or 120/240 V ac, nominally 650 mA at 12 V, ~8 watt (~7 watt with cell heater unplugged)
Size	3.7 x 8.5 x 11.5 inches (9.5 x 21.5 x 30 cm)
Weight	5.8 lb (2.6 kg); 3.1 lb (1.4 kg) without instrument case
Internal Data Logger Capacity	16,383 lines (2-s fast measurement mode = 9.1 hr; 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	> 2 GB (> 5-year capacity for 10-s averaging mode)
Analog Inputs for Internal Logging of Other Instruments	3 Analog Inputs, 0-2.5 V; For example, could log external T, P, and RH
Data Outputs	RS232, 0-2.5 V Analog, LCD Display, External USB Converter (Optional 4-20 mA Current; request quote)
Data Transfer Baud Rates	2400, 4800, 19200
Output Ranges	User-Defined Scaling Factor in Menu
DewLine™	Yes
Quiet, Long-Life Internal Air Pump	Yes
Flow Meter	Yes
Options	Battery; External Particle Filter; Serial-to-USB Adapter; GPS (for 10-s data mode and above); Bluetooth; 4-20 mA Current Output; Cold-Weather Package (pump, lamp heater); High-Altitude Upgrade (pressure sensor); Extra-Long-Life, Low-Temperature Internal Air Pump; Low-Power Option; Rack-Mount Case Configuration

Warranty Information

1 year warranty on defective parts, materials and workmanship.

California Regulatory Warning

Use in unoccupied spaces only.
Health hazard warning: emits ozone.

This product is not CARB Certified (Ozone Emissions for Air Cleaners).
Product Disclaimer: Does not meet California air cleaner regulation requirements; cannot be shipped to California.