​Model 454

Process Ozone Monitor




  • Standard one year warranty
  • Ranges 0-5% w/w to 0-25% w/w
  • DIN panel mount
  • High visibility, 4-digit display
  • Temperature and pressure compensation
  • Units in % w/w or g/Nm3
  • Narrow bandwidth detector eliminates need for UV filters
  • Analog and RS232/485 outputs
  • Status LEDs to monitor performance
  • 316 stainless steel cell







454_Literature_RevA.pdf454 Specification293 KB
M454 Manual_03202.pdf454 Manual3537 KB


Pressure and temperature compensation Standard
Proof Pressure Lower Detectable Limit 0.04 %
Inlet Pressure 7 to 30 psia
Proof Pressure 100 psia
​Repeatability < 0.5% of full scale
Accuracy < ±0.1%
Response Time < 60 seconds to 95%
Zero Drift < 30 seconds to 95%
Operating Temperature Range  5-45 50 C
Wetted Materials  316 Stainless Steele, PTFE, Saphire, ALO3
​Fittings  ​ ​1/4" stainless steel
Flow  .5 to 2.0 LPM
Power  90-265 VAC 50/60 Hz
Display  4 digit LED readout
Analog output

 0–5V Full Scale; 4-20mA or 0-20mA isolated outputs optional

Zero calibration  Front panel keypad, contact closure input
Digital Outputs 5 - 40ºC
Serial Data Interface  RS485 or RS232
Weight  4.0 lbs ( 1.8 kg)
​Dimensions (H x W X D)

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

3.83” (97 mm) x 7.61” (193 mm) x 7.63” (194 mm)


The Model 454 is a microprocessor based gas monitor for measuring mid to high concentrations of ozone in oxygen or air. Available in a standard DIN panel mount configuration with a 4-digit LED display, the compact design provides ease of mounting and installation.

The 454 Series is available in full scale ranges from 0-5% w/w to 0-25% w/w, and is factory calibrated in accordance with International Ozone Association standards.  The measurement principle is based on the absorption of UV light at 254nm. As the sample containing ozone flows through the absorption cell, it is exposed to UV light at the 254nm wavelength.  The amount of absorption by ozone is measured by a narrow bandwidth UV detector.

A reference detector measures the lamp output to compensate for changes in light intensity.  This method, using a narrow spectrum UV source and a narrow bandwidth detector, provides excellent performance and stability without requiring additional UV filters. 

The 454 Series’ temperature and pressure compensation normalizes readings to weight/volume.  A front panel keypad displays concentration or cell pressure, while LEDs indicate monitoring status.  The units employ a state-of-the-art microprocessor design to provide accurate, dependable monitoring of the ozone process.