Zero Air Generator
http://aaqms.in/zero-air-generator/

Vasthi InstrumentsZero Air Generator provides ultra-pure pollutant-free zero air for analytical purpose. Remote monitoring and configuration can also be achieved through digital access.
Key Features:
• Ultra-high purity zero air output
• Integrated dew point sensor
• Regenerative dryer utilizing molecular sieve to perform maintenance free advantage
• High performance scrubbers to remove hydrocarbon, CO, SO2, NO, NO2 and Ozone
• Remote display and configuration on key functions
Principle
The VASTHI Zero Air Generator clean and dry zero air by removing components which will cause interference on monitoring results.

Regenerative scrubber:
The scrubber is filled with molecular sieve which has multiple holes and filters only water molecule with certain diameter. A second molecular sieve will be alternate for raw air diversion while the other is under regeneration by injecting compressed air to remove moisture.
HC/CO/NO scrubber:
To remove hydrocarbon, CO and NO, three dependent scrubbers applying catalytic reaction are used, where HC and CO will be converted into CO2 which does not interfere analysis and NO will
be converted into NO2 which will then be removed by purifier.
Technical Data:
Output = 20 SLPM at 30 psig
Dew Point = -30℃
Output Concentration = SO2: <0.025 ppb
                                           NO: <0.025 ppb
                                          NO2: <0.025ppb
                                          O3: <0.3 ppb
                                           CO: <10 ppb
                                          CH4: <5 ppb
                                          Other HC: <0.25ppb
Power Requirement = 230 VAC, Converter applicable
Operating Temperature = 0~40℃

AMBIENT OZONE ANALYZER 

Vasthi Instruments Ozone (O3) analyzer measures ambient O3 concentration in pp b level by utilizing UV photo metric absorption technology.
Key Features
• Accurate direct UV absorption with reference comparison
• 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
The concentration of ambient ozone is proportional to UV light absorption since there is a significant characteristic absorption for ozone on wavelength of 254nm.
Periodical diversion on sample flow passing through the ozone scrubber will generate reference measurement, which is compared with sample measurement to provide stable and representative result.

Ozone scrubber
The ozone scrubber is filled with MnO2 as catalyst, which will convert O3 to O2 to form reference gas. Meanwhile, the presence of other components remains the same.
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: 0~100 ppb F.S.
Max: 0~10 ppm F.S. (Selectable)
Zero Noise < 0.3 ppb (RMS)
Span Noise < 0.5% of reading (RMS) above 100 ppb
Lower Detectable limit < 1 ppb
Zero Drift (24 hours) < 1 ppb
Span Drift (24 hours) < 1% F.S.
Response Time < 20s (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 over the range of 5~40°C
Power Requirement 100~240 VAC, Converter applicable
Dimensions and Weight 178mm(H) x 432mm(W) x 609mm(D), 15kg