The Model 205 Ozone Monitorä 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 desired. Alternatively, one can choose to average more points internally to obtain even better precision.
The Model 205 has all of the features of the Model 202, including choice of averaging time (2 s, 10 s, 1 min, 5 min, 1 hr), analog output (0-2.5 V), real time serial output, internal data logger with 3 analog inputs for simultaneous logging of other measurements (e.g., T, P and RH), real time clock, and optional flash memory.
Schematic Diagram
Features
- Backup sampling pump and flow meter (now standard); if the flow rate drops below a critical value, the backup pump is activated and an indication displayed on the LCD
- Internal data logger (EEPROM), logs 14,336 lines of data
- Real time clock
- Both serial and user-scaleable analog voltage outputs (5-20 mA current output optional)
- 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 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
Options
- Flash Card Memory for virtually unlimited, portable data storage
- GPS for continuous logging of latitude, longitude and altitude
- Rechargeable metal hydride battery provides 12 hr of continuous operation
- External particle filter
- Serial-to-USB adapter
- Rotary vane air pump for low temperature and quiet operation
- External air pump for long pump life
Specifications
| Measurement Principle |
UV Absorption at 254 nm; Dual Beam |
| Linear Dynamic Range |
1.0 ppb to 100 ppm |
| Resolution |
0.1 ppb |
| Precision (1σ; rms noise) |
Greater of 1.0 ppb or 2% of reading |
| Accuracy |
Greater of 1.0 ppb or 2% of reading |
| Limit of Detection (2σ) |
2.0 ppb |
| NIST-Traceable Calibration |
Yes |
| Measurement Interval |
2 s (Data averaging options: 2 s; 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 |
| Averaging Times |
2 s, 10 s, 1 min, 5 min, 1 hr |
| Data Storage |
14,336 lines (10 s avg. = 1.4 days; 5 min avg = 1.4 mo.) |
| Ozone Units |
ppb, ppm, pphm, mg 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; -20 to 50 °C with low temperature modifications (rotary vane pump and lamp heater) |
| Operating Altitude Range |
~0-30 km (~30-1000 mbar) |
Power Requirement;
Supplied by battery or 110/220 VAC Power Pack |
12 V dc or 120/240 V ac, 415 mA, 5.0 watt (3.9 watt with cell heater unplugged) |
| Size |
3.5 x 8.5 x 11 inches (9 x 21 x 29 cm) |
| Weight |
4.7 lb (2.1 kg); 1.6 lb (0.7 kg) without instrument case |
| Data Logger Capacity |
14,336 lines (10 s avg. = 1.4 days; 1 min avg = 10 days; 5 min avg = 1.4 mo;
1 hr avg = 1.6 yr |
| 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 |
1200, 2400, 4800, 19200 |
| Output Ranges |
User Defined Scaling Factor in Menu |
| DewLine™ |
Yes |
| Backup Air Pump |
Yes |
| Flow Meter |
Yes |
| Options |
GPS, Flash Card Memory, 4-20 mA Current Output; Lamp Heater; Rotary Vane Air Pump; Long-Life External Air Pump; Rack Mount Case |
System Includes
- Model 205 Ozone Monitor
- AC Power Adapter (100-240 VAC to 12 VDC) with Country-Specific Plug
- Cigarette Lighter Adapter
- Battery Wire Connector
- Zeroing Cartridge
- Operation Manual on CD
- Calibration Data and NIST-Traceable Calibration Certificate
- Instrument Birth Certificate
- One Year Warranty
To download a brochure describing the Model 205 Ozone Monitor™ (PDF format), click on the download button below.
Confused about which ozone monitor best suits your application? Click here for a comparison of all of our ozone monitors and a discussion of their suitability to various applications.
|
