49i PS Ozone Primary Standard

Produce ozone concentrations of up to 1000 ppb with the Thermo Scientific™ Model 49i-PS Ozone Primary Standard, a UV photometric primary standard suitable for calibration of ozone analyzers and transfer standards. The Model 49i-PS uses a dual-cell photometer, the concept adopted by NIST as the principle technology for the national ozone standard.

Key Features:

  • Achievable response time of 20 seconds
  • Ozonator flow rates of up to 6L/min.
  • Fast internal ozonator and response time
  • Temperature and pressure correction

iSeries Advantage:

  • Ethernet connectivity for efficient remote access
  • Enhanced user interface with one button programming and large display screen
  • Flash memory for increased data storage and user downloadable software
  • Enhanced electronics design optimizes product commonality
  • Improved layout for easier accessibility to components



Preset ranges0-0.05, 0.1, 0.2, 0.5, 1, 2, 5, and 10 ppm,
0-0.2, 0.5, 1, 2, 5, 10, 20, and 25 mg/m3
Custom ranges0-0.05 to 5 ppm 0-0.1 to 10μg/m3
Zero noise0.25 ppb RMS (60 second averaging time)
Lower detectable limit0.5 ppb
Zero drift<1.0 ppb/24 hour
Span driftless than 1% per month (including drift of transducers)
Response time20 seconds (10 second lag time)
Precision1.0 ppb
Linearity+/-1% full scale
Sample flow rate1-3 liters/min.
Operating temperature32°F to 113°F (0°C – 45°C)
Power requirements100 VAC, 115 VAC, 220-240 VAC +/-10% @ 150W
Size and weight16.75″ (W) ´ 8.62″ (H) ´ 23″ (D), 48 lbs.
425 mm (W) ´ 219 mm (H) ´ 584 mm (D), 25 kg
OutputsSelectable Voltage, RS232/RS485, TCP/IP, 10 Status Relays, and Power Fail Indication (standard). 0-20 or 4-20 mA Isolated Current Output (optional)
Inputs16 digital inputs (standard), 8 0-10Vdc analog inputs (optional)
Ozonator Output.025 – 1.000 ppm @ 3-4 LPM
Ozonator Response1 minute to 98% or 5 ppb of final value, whichever is greater
Stability+/- 4 ppb or +/- 1% or reading, whichever is greater