​Model 454

Process Ozone Monitor


  • 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






ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
M454 Manual_03202.pdf454 Manual3537 KB
SAL000019D - 454 Web.pdf454 Specification2988 KB
SAL000019E-CN 454.pdf454规格 (Chinese Specification)2694 KB
SAL000107B - Industrial Gas Instruments Overview.pdfIndustrial Gas Instruments Overview545 KB


Pressure and Temperature Compensation
​0-5, 0-10, 0-15, 0-20, 0-25% w/w
0-100, 0-200, 0-300, 0-400​​​, 0-500g/Nm3
Cell​ Pressure 7 to 30 psia
Proof Pressure 100 psig
​Repeatability 0.5% of full scale
Response Time < 30 seconds ​​​​to 95%
Zero Drift 1% full scale/month (non-cumulative)
Temperature Range  5-45°C
Wetted Materials  316 Stainless Steel, PTFE, Sapphire, AIO3
​Fittings  ​ ​1/4" stainless steel
Flow  0.1 to 5.0 L/min
Power  90-265VAC, 50/60Hz
Display  4-digit LED readout
Analog Outputs

 0–5V full scale; 4-20mA or 0-20mA
isolated outputs optional

Zero Calibration  Front panel keypad, contact closure input
Digital Outputs  Sensor OK, Lamp Low, Cell Dirty, Invalid Reading (Opto-isolated)
Serial Outputs
 RS485 or RS232
Weight  4.​0 lbs (1.8 kg)
​Dimensions (H x W x D)
 3.83” (97 mm) x 7.61” (193 mm) x 7.63” (194 mm)
Specifications are subject to change without notice.
All specifications are based on constant conditions.


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, 0-100 g/Nm3 to 0-500 g/Nm3​, 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 includes temperature and pressure compensations that produce measurements which are normalized to standard conditions. 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.​​