24/7 Technical Support
Thermo 49I Thermo Scientific Get Quote



Now available for rent, the Thermo Ozone analyzer, model 49i utilizes uv photometric technology to measures the amount of ozone in the air from ppb levels up to 200ppm.The Model 49i is a dual cell photometer, the concept adopted by the NIST for the national ozone standard. Dual range and auto range are standard features in this instrument. Because the instrument has both sample and reference flowing at the same time a response time of 20 seconds can be achieved. Temperature and pressure correction are standard features. User settable alarm levels for concentration and for a wide variety of internal diagnostics are available from an easy to follow menu structure. This state-of-the-art gas analyzer offers features such as an ethernet port as well as flash memory for increased data storage and field upgradability. Ethernet connectivity provides efficient remote access, allowing the user to download measurement information directly from the instrument without having to be on-site. You can easily program short-cut keys to allow you to jump directly to frequently accessed functions, menus or screens The larger interface screen can display measurement information and status, while viewing menu and operational screens.

Key Features

  • Flash memory for increased data storage and user downloadable software
  • Ethernet connectivity for efficient remote access
  • Enhanced user interface with one button programming and large display screen
  • Temperature and pressure correction are standard features.
  • Enhanced electronics design optimizes product commonality

Technical Specifications

Preset Ranges 0-0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50,100 and 200 ppm
Custom Ranges 0-0.05 to 200 ppm
Zero Noise 0.25 ppb RMS (60 second averaging time)
Lower Detection Limit 0.50 ppb
Zero Drift <1.0 ppb
Span Drift <1% full scale per month
Response Time 20 seconds (10 second lag time)
Precision 1.0 ppb
Linearity +/-1% full scale
Sample Flow Rate 1-3 liters/min.
Operating Temperature 20°C - 30°C
Power Requirements 100 VAC, 115 VAC, 220-240 VAC +/-10% @ 150W
Outputs Selectable Voltage, RS232/RS485, TCP/IP, 10 Status Relays, and Power Fail Indication (standard). 0-20 or 4-20 mA Isolated Current Outout (op


  US Metric
Dimensions 16.75 x 8.62 x 23 in. 425x 219 x 584 mm


  US Metric
Weight 55 lbs 25 kg


Application Note - Air Quality study.pdf
Article describing the use of a Thermo49i ozone analyzer during a school air quality study