Thermo 450I
Thermo Scientific

Thermo 450I

Pine Item #54399

Utilizing pulsed fluorescence technology the Model 450i H2S and SO2 analyzer operates on the principle that H2S can be converted to SO2. As the SO2 molecules absorb ultraviolet (UV) light and become excited at one wavelength, the molecules then decay to a lower energy state emitting UV light at a different wavelength. The pulsing of the U.V. source lamp serves to increase the optical intensity whereby a greater U.V. energy throughput and lower detectable SO2 concentration are realized. Reflective bandpass filters, as compared to commonly used transmission filters, are less subject to photochemical degradation and are more selective in wavelength isolation. This results in both increased detection specificity and long term stability.This state-of-the-art gas analyzer also offers features such as an ethernet port as well as flash memory for increased data storage. Ethernet connectivity provides efficient remote access, allowing the user to download measurement information directly from the instrument without having to be on-site.


Pulsed excitation and intensity stabilization

Reflective bandpass filters

Stable lone-life UV source

Superior zero stability

Temperature stabilization reaction chamber

Quantity must be 1 or more
Equipment available for both rental and purchase
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Technical Specifications

Preset Ranges0-0.05 0.1 0.2 0.5 1 2 5 and 10 ppm
Extended Ranges0-0.5 1 2 5 10 20 50 and 100 ppm
Custom Ranges0-0.05 to 100 ppm
Zero Noise1.0 ppb Manual H2S or CS 3.0 ppb Auto (10 second averaging time) 0.5 ppb 1.5 ppb (60 second averaging time) 0.25 ppb 0.75 ppb (300 second av
Lower Detectable Limit2.0 ppb Manual H2S or CS 6.0 ppb Auto (10 second averaging time) 1.0 ppb 3.0 ppb (60 second averaging time) 0.5 ppb 1.5 ppb (300 second aver
Zero DriftLess than 1 ppb
Span Drift#ERROR!
Response Time80 seconds (10 second average time) 110 seconds (60 second average time) 320 seconds (300 second average time)
Precision1% of reading or 1 ppb (whichever is greater)
Sample Flow Rate1.0 liter/min
Converter Efficiency> 80% H2S to SO2. Note: Various other Sulfur compounds can be converted at varying %
Operating Temperature20°C-30°C
Power Requirements100 vac 115 vac 220-240 vac +/- 10% @ 300W
OutputsSelectable Voltage RS232/RS485 TCP/IP 10 Status Relays and Power Fail Indication (standard). 0-20 or 4-20 mA Isolated Current Outout (op
Inputs16 Digital Inputs (standard) 8 0-10vdc Analog Inputs (optional)
DimensionsUS: 16.75 x 8.62 x 23 in. Metric: 42.5 x 21.8 x 58.4 cm
Manuals & Data Sheets

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