Model 405 Nitrogen Dioxide Analyzer
Model 405 nm NOx Monitor from 2B Technologies is designed for the direct measurement of atmospheric nitrogen dioxide, nitric oxide, and total reactive oxides of nitrogen.The wavelength of 405 nm was chosen because no other species found in ambient air has significant absorbance at that wavelength, making the Model 405 nm extremely selective for NO2.
Theory of Operation
The following figure is a simplified schematic diagram of the Model 405 nm NOx Monitor. Sample air is continuously drawn through the instrument by an air pump at a flow rate of ~2 L/min. The Scrubber Valve alternately bypasses and sends the sample air through a NO2 scrubber to remove all NO2 in the sample, thus allowing the measurement of a light intensity in the absence (Io) of NO2 and presence (I) of NO2. The Beer-Lambert Law is then used to calculate the concentration of NO2 from I and Io.
Specifications
Federal Equivalent Method | Yes, for NO2 (0-500 ppb, 20-30°C), EQNA-0217-243 |
Principle of Measurement | Direct absorbance of NO2 at 405 nm |
Measurement Modes | NO2 only; NO only; NO2, NO and NOx |
Linear Dynamic Range | 0-10,000 ppb (0-10 ppm) for NO2; 0-2,000 ppb (0-2 ppm) for NO (FEM approved for 0-500 ppb NO2 for 20-30°C) |
Resolution | 0.1 ppb |
Precision (1σ rms noise) | < 0.5 ppb or 0.5% of reading (with adaptive filter1) |
Accuracy | Greater of 2 ppb or 2% of reading |
Limit of Detection (2σ) | < 1 ppb (with adaptive filter1) |
Flow Rate (nominal) | 1.5 Liter/min |
Flow Rate Requirement | Minimum: 1.4 Liter/min; Maximum: 1.6 Liter/min |
Response Time, 100% of Step Change | 10 s for 5-s averaging 20 s with adaptive filter1 |
Measurement Frequency | 0.2 Hz (once every 5 s) |
Averaging Times | 5 s, 1 min, 5 min, 1 hr |
SD Card Logger Capacity | Minimum 2 GB (> 5-year capacity for 10-s measurement mode) |
Internal Data Logger Capacity | 8,192 data lines (5-s avg = 1.4 days; 1-min avg = 5.7 days; 5-min avg = 1.0 mo; 1-hr avg = 0.94 yr) |
Concentration Units | ppb, ppm, pphm |
Pressure Units | mbar |
Temperature Units | °C |
T and P Corrected | Yes |
Operating Temperature Range | 10 to 50°C (FEM approved for 20-30°C for NO2) |
Power Requirement; Supplied by 5-amp 110/220 VAC Power Pack (provided) or Battery |
11-14 V dc or 120/240 V ac, 1.4 A at 12 V, 17 watt Max: 2.9 A at 12 V, 35 watt (warmup) |
Size | Rackmount: 17" w x 14.5" d x 5.5" h (43 x 37 x 14 cm) |
Weight | 18.6 lb (8.4 kg) |
Data Outputs | RS232; 0-2.5 V Analog Outputs for NO and for NO2 |
Data Transfer Baud Rate | 2400 |
Output Ranges | User-Defined Scaling Factor in Menu |
DewLineâ„¢ | Yes |
Long-Life Pump | Yes: 15,000 hr, 1.7 yr of continuous operation |
Flow Meter | Yes |
Options | Bluetooth for wireless data transmission; USB output (in place of RS232) |
Notes
1An adaptive filter may be selected from the menu, making signal averaging similar to competing NOx monitors. Specifications above are for default parameters: Change Difference = 40 ppb, Change Percent = 10%, Short Filter = 4 pts (20 s), Long Filter = 36 pts (3 min). Adaptive filter parameters may be adjusted by the user.
Filters
We highly recommend replacing the filter frequently to prevent contamination of the flow path by particulate matter.
Picture of Filter Housing: Product: FILTERHS
Downloads
Manufacturer | 2B Technologies |
---|---|
Call For Price | No |
Gas | Nitric Oxide (NO), Nitrogen Dioxide (NO2), Nitrogen Oxides (NOx) |
Resolution | 0.1 ppb |
Response Time | 10 seconds |
Sensor type | UV Analzyer |
Sampling Method | Fan |
Alarms | Relays |
Power Requirements | 11-14 VDC or 120/240 VAC |
Size | 17x14.5x5.5 inches |
Field Replaceable Battery | No |
Warranty | 1 Year |
Audible Alarm | No |
Calibration | Annually |
Sensor Life | 2 Years |
Range | 0-2 ppm (NO), 0-10 ppm (NO2) |
Unit Features | -Measures both NO & NO2 -Resolution of 0.1 ppb -Bluetooth for Wireless Data Transfer |
Sensor Range | 0-2 ppm (NO) 0-10 ppm (NO2) |