​Model 452

Process Ozone Sensor




  • Standard one year warranty
  • Ranges from 0 - 5% to 0 - 20% w/w
  • Temperature and Pressure Compensation
  • Units of weight % or grams/Normal m3
  • Narrow Band detector eliminates need for UV filters
  • Analog and RS485/RS232 outputs
  • Status outputs to monitor operation
  • Available for high purity applications



452_Literature_RevA.pdf452 Specification178 KB
M452 Manual - 02852.pdf452 Manual449 KB


Ranges 0 - 5, 0 - 10, 0 - 15, 0 -20% w/w; 0 - 100, 200, 300, 400 g/Nm3
Pressure Compensation < 0.2 % ppb (RMS)
Proof Pressure 115 psia
Repeatability 1% of full scale
Response Time 2 seconds to 95%
​Temperature Range 5° to 45°C
​Zero Drift 1 % full scal/month (non cumulative)
Wetted Materials ​316 Stainless Steel, PTFE, Sapphire
Fittings +15 volts @ 1.5A max
Flow 0.5 to 5.0 LPM
Power 0.5 to 5.0 LPM
Display Operating Temperature Range 4-digit LED readout
​Analog Output ​7” x 17” x 23.5” (178 x 432 x 597 mm)
Weight 2.8 lbs (1.27 kg) ​​
Zero Calibration Contact Closure input
Digital Outputs Sensor OK, Lamp Low, Cell Dirty, Invalid, Reading (Opto-Isolated)
Serial Data Interface RS232 or RS485
Dimensions (HxWxD) including fittings 5.13” (130.3 mm) x 2.13” (54.1 mm) x 6.69” (169.9 mm)
Options AC power adapter
High purity (VCR fittings, 316L, 10 Ra finish)
External Ozone Destructor
External Particulate Filter
Specifications are subject to change without notice.
All specifications are based on constant conditions.​



The Model 452 is a microprocessor-based gas sensor for measuring high concentrations of ozone in oxygen or air with accuracy and dependability.  The measurement principle is based on the absorption of UV light at 254nm. Readings are available in % by weight, or grams/Normal cubic meter.  Temperature and pressure compensation up to 3 Bar Absolute is a standard feature (with pressure compensation up to 3 Bar Absolute dependent upon range).  Its compact size allows for easy installation in process applications.

The flow pattern is a straight through design (eliminating turns and elbows), reducing exposed surface area.  The 452 uses detectors which have a very narrow band of spectral sensitivity, eliminating the need for UV band pass filters which are subject to deterioration by UV or humidity.

Two detectors are used: one for the ozone measurement, and the other to compensate for changes in UV lamp intensity. This unique design provides a sensor which will operate for extended periods without calibration or maintenance.

The sensor offers both analog and RS485/RS232 outputs as well as 4 optoisolated status outputs to indicate sensor operation or failure modes. Input/output and power input connections are made through the 15-pin D-sub connector . For high purity applications, the 452 manifold is available in 316L, 10Ra finish, and 1/4” VCR fittings.