Nitrogen Oxide Analyzer
http://aaqms.in/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.
Key Features:
• 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
Principle:
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.

Carbon Monoxide Analyzer

Vasthi Instruments Carbon monoxide (CO) analyzer measures ambient CO concentration by employing non-dispersive infrared with gas filter correlation method technology.
Key Features
• 14 meters optical path to perform high reliability
• Five years guarantee on GFC wheel
• 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

Principle
Infrared energy emitted by light source is passed through gas chamber containing the air sample, and the quantitative absorption of energy by CO in the sample cell is measured by corresponding detector.

GFC
GFC (Gas filter correlation) technology is utilized to remove interference caused by moisture and other backgrounds.
Two gas filled chambers are mounted on a rotating disc, which pass through an IR beam alternately. The measure chamber is filled with nitrogen while the reference chamber is filled with high concentration CO. IR beam then passes through the sample gas cell. The difference in absorbance is measured and provides a direct output of the gas concentration.

Data storage and analysis
Stored data are easily retrievable through the serial or ethernet port via PC client software, allowing operators to perform predictive diagnostics and enhanced data analysis by tracking parameter trends.

Technical Data:
Standard Range Min: 0~50 ppm F.S.
Max: 0~1,000 ppm F.S. (Selectable) 
Zero Noise : < 0.04 ppm (RMS) 
Span Noise : < 0.25 ppm 
Lower Detectable limit : < 0.08 ppm 
Zero Drift (24 hours) : < 0.2 ppm 
Span Drift (24 hours) : < 1% F.S. 
Response Time : < 60s (T90) 
Precision : < 0.5% 
Linearity : < 1% F.S. 
Sample Flow Rate: 800 cc/min ±10% 
Operating Temperature : 20~30°C range (per US EPA guidelines).
Instrument may be safely operated ove the range of : 5~40°C 
Power Requirement : 100~240 VAC, Converter applicable

Water Analyzer
http://www.vasthi.com/water-analyzer-2/

Vasthi Instruments adopts the pulse xenon lamp as light source and the ultraviolet optical fiber spectrometer as detector is capable for real-time gathering of absorption spectrum of water pollutants ranging from 200nm to 800nm and real-time analysis of the content of water pollutants by means of chemometric algorithm technology. Optical path as shown below.for more information.
The analyzer includes two parts: the control box and the probe. The control box is installed in the analysis cabin and the probe is submerged in the water and fixed by means of mounting bracket the two parts are connected via cable. The control box provides power supply to the probe and at the same time receives the measurement value from the probe and displays them on the interface.