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.
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 that have a narrow band of spectral sensitivity, eliminating the need for UV band pass filters that 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 that will operate for extended periods without calibration or maintenance. The sensor offers both analog and RS485/RS232 outputs as well as 4 opto-isolated 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.​


  • Standard one year warranty
  • Compact design (12.3 in2 footprint)
  • Ranges from 0 - 5% to 0 - 25% w/w
  • Temperature and Pressure Compensation
  • Units in % w/w or grams/Normal m3
  • Narrow bandwidth detector eliminates need for UV filters
  • Analog and RS485/RS232 outputs
  • Status outputs to monitor operation
  • Designed for high purity and inline applications


  • Semiconductor
  • Medical, Food and Berverage


0 - 5, 0 - 10, 0 - 15, 0 - 20,​ 0 - 25% w/w; 0 - 100, 200, 300, 400, 500 g/Nm3
 Pressure Compensation up to 3 Bar absolute
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 scale/month (non-cumulative)
Wetted Materials ​316 Stainless Steel, PTFE, Sapphire
Fittings 1/4" stainless steel compression (tube) or High Purity (VCR™ or HTC® fittings, 316L, 10 Ra finish)
Flow 0.5 to 25.0 SLPM
Power +15 volts @ 1.5A max
Indicators 4 status LEDs
 ​Analog Output 0-5V full scale
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) 6.71" (170.4 mm) x 5.13” (130.3 mm) x 2.16” (54.8 mm) including fittings

Specifications subject to change without notice.
All specifications are based on constant conditions.