Nitrogen Oxides Analyzer
Vasthi Instruments Vasthi Nitrogen oxides (NO- NO2 -NOX ) analyzer for measuring the Nox levels in the ambient (CAAQMS) purpose. It utilizes chemiluminescence technology indicated by US EPA as federal reference method for monitoring on multiple forms of nitrogen oxides.
• Permeation dryer on Ozone generator
• Catalytic Ozone scrubber
• Independent ranges for NOx, NO and NO2
• Compliance with US EPA reference method
• Various outputs include ethernet and RS232
• User friendly interface with large screen
• Continuous system diagnosis with alarm
• Multi-tasking software allows viewing test variables while operating
• Temperature and pressure compensation
• Internal data logging with 1 min to 365 day multiple averages
Nitrogen oxides in ambient are measured indirectly by photometrically measuring the light intensity, resulting from the chemiluminescent reaction of nitric oxide (NO) with ozone (O3 ).
NO2 is first quantitatively reduced to NO by means of a converter. NO, which commonly exists in ambient air together with NO2, passes through the converter unchanged causing a resultant total NOx concentration equal to NO + NO2.
A sample of the input air is also measured without having passed through the converted. This latter NO measurement is subtracted from the former measurement (NO + NO2) to yield the final NO2 measurement.
The optical filter(660nm) attached on PMT provides reliable measurement, and temperature are controlled between 6~8℃ with only 0.1℃ fluctuation by a thermoelectric cooler, ensure the measurement stability.
Permeation dryer are introduced in ozone generation to provide long system durability without any replacement.
An catalytic ozone scrubber is standard for maximum safety and pump life before exhaust.
Standard Range Min: 0~100 ppb F.S. Max: 0~20 ppm F.S. (Selectable)
Zero Noise < 0.4 ppb (RMS)
Span Noise < 2.5 ppb
Lower Detectable limit < 0.8 ppb
Zero Drift (24 hours) < 2 ppb
Span Drift (7 days) < 5 ppb
Response Time < 60s (T90)
Precision < 1%
Linearity < 1% F.S.
Sample Flow Rate 500 cc/min ±10%
Operating Temperature 20~30°C range (per US EPA guidelines).
Instrument may be safely operated over the range of 5~40°C
Power Requirement 100~240 VAC, Converter applicable