​Model 465M

Process Ozone Monitor

465M Ozone NEMA.png


  • UV Absorption Method
  • Microprocessor controlled
  • Menu driven software
  • Ranges 0-1000​​ ppm to 0-10,000 ppm
  • Built-in diagnostics
  • Self-check warning alarms
  • Fast response times
  • Minimal zero drift
  • Sample Conditioning System for sampling from humid environments
  • Programmable concentration alarms
  • Temperature and pressure compensation (standard)
  • Optional Ethernet


​The following table provides a list of items that  need regular maintenance to ensure your product remains in good working condition.

Particulate Filter ElementReplace6 months9.3
UV LampAdjustAs Indicated by ‘Check Lamp’ LED or status output9.4
UV LampReplaceAs required; when adjustment can no longer be performed.9.5
Sample PumpReplace2 years9.6
Auto-Zero ValveReplaceannually9.7
Cells, O-ringsRebuild, replace3 yearsReturn to factory

1 These Items are required to maintain full warranty; all other items are strongly recommended.

2 A pump rebuild kit is available from Teledyne API's Technical Support including all instructions and required parts

 3 Replace desiccant bags each time the inspection plate for the sensor assembly is removed.




ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
M465M Manual - 06160.pdf465M Manual4321 KB
SAL000022E - 465M.pdf465M Specification2494 KB
SAL000022F-CN 465M.pdf465M规格 (Chinese Specification)2705 KB
SAL000107B - Industrial Gas Instruments Overview.pdfIndustrial Gas Instruments Overview545 KB
SAN21-0006A - Sample Conditioning O3 Humidity.pdfSample Conditioning – Ozone in High Humidity Environments206 KB


Measurement Principle UV Absorption (Beer Lambert Law)
Ranges 0-1,000 ppm to 0-10,000 ppm
0-5 g/Nm3​ to 0-50 g/Nm3
0-1% w/w to 0-3% w/w
Units % w/w, g/Nm3, ppm
​± 1% of full scale
± 0.5% of full scale
Display Resolution 1 ppm, 0.001% w/w, 0.01 g/Nm3
Response Time
< 45 seconds to 95%
Pressure, Temperature
(NTP = 273.15K, 760mmHg)
Gas Inlet Pressure Range
11.0 - 16.0 psia
Gas Flow Rate
0.8 LPM
Temperature Range 5 - 45°C
Analog Output
0-5V or 4-20mA isolated output
Status Outputs
System OK, Invalid Reading, UV Lamp Fault
​RS-232 (Optional RS-485)
​57.6 Kbaud, DB-9 connector
Power 110-240V, 50/60Hz, 74W
Dimensions (HxWxD)
NEMA 4X – 16.85" (428 mm) x 15.60" (396 mm) x 6.90" (175 mm)

NEMA 4X – 17.2 lbs (7.8 kg)

​​ Degree of Protection (NEMA)
IP65 (NEMA 4X)
1 year​
Specifications are subject to change without notice.
All specifications are based on constant conditions.​


The Model 465M is a microprocessor based medium range ozone monitor for measuring process ozone concentrations in water treatment, food processing, and research applications. The design has been specifically optimized for applications requiring the measurement of ozone at near-ambient pressure such as water treatment contactor off-gas measurement. The Model 465M has been designed to give accurate and stable readings over long time periods with little or no maintenance or calibration. The Model 465M is available in a NEMA 4X wall mount enclosure.​

The sensor module contained in the Model 465M 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.​

Built-in diagnostics provide warning signals in case operating parameters are out of range. Test values can be viewed while the Model 465M is operating. These displays, warnings, and self-diagnostics, along with the modular design, allow maximum uptime. In addition, any function that can be set or monitored from the front panel can be remotely set or viewed
through the bi-directional RS-232 port.​