美国2B公司的205型双光束紫外光臭氧分析仪，采用****的254nm紫外双光束光源技术及设计，可以同时测量被测样品臭氧值及去臭氧的净化空气值。结合其它专利技术设计，205型双光束紫外光臭氧分析仪的测量响应时间仅需2秒，成为市场上最快响应时间的臭氧分析仪。仪器量程由1ppbv至100ppmv。该仪器具有高精度(1ppb)、体积小、重量轻(5磅,2.3kg)及耗电量低。特别适合使用于航天及汽球上的大气臭氧测量。
| 操作原理 | 双光束紫外光254nm灯 |
| 量程 | 1ppbv~100ppmv |
| 精度 | ±2% |
| 采样时间 | 2秒、10秒、1分钟、5分钟及1小时 |
| 记忆容量 | 20,480组 |
| 输出 | 数码显示，0~2.5V，RS-232 |
| 流量 | 大约1L/min |
| 尺寸 / 重量 | 90 × 210 × 290 mm / 4.7磅 |
| 电源 | 12VDC交流电 |
The Model 205 Ozone Monitorä makes use of two detection cells to improve precision, baseline stability and response time. In the Dual Beaminstrument, 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 betweenozone 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 202Ozone Monitor. Fast measurements are especially desirable for aircraft and balloon measurements where high spatial resolution is desired. Alternatively, one can choose to average morepoints 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
Options
Specifications
| Measurement Principle | UV Absorption at 254 nm; Dual Beam |
| Linear Dynamic Range | 1.0 ppb to 250 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 |
| Sensitivity Drift | <1%/day |
| Measurement Time, Frequency | 2 s, 0.5 Hz |
| Response Time, **** 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
To download a brochure describing the Model 205 Ozone Monitor™ (PDF format), click on the download button below.
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