产品品牌：

美国2B Technologies

产品型号：

205

产品简介

美国2B公司的205型双光束紫外光臭氧分析仪，采用新技术的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(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。

特点：

• 使用双束254nm紫外光吸收法
• 高及分解度，量程由1ppbv至100ppmv
• 2秒响应时间，较同类型产品优越
• 低电量消耗，能以12V DC (5.0W)外置电源操作
• DewLineTM 技术减低水气对仪器的干扰
• 内置数据记录功能及实时时钟显示。并有3组仿真讯号输出
• 以RS-232输出时间、日期、臭氧浓度、仪器内温度、气压及另外3组补充轮入讯号，例如外置温度、湿度及气压
• 模拟输出0-2.5V
• 选配GPS功能及CF记忆卡

应用：

• 气球及航空的大气测量
• 建立遥控监测网络
• 建立城市监测网络
• 个人及工作环境监测
• 工业生产中监测

产品规格：

操作原理	双光束紫外光254nm灯
量程	1ppbv~100ppmv
	±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 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 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 <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.