​Model 465L + O2

Industrial Hygiene Ozone Analyzer with Oxygen Sensor



  • O3 and O2 monitoring in a single wall-mounted unit
  • UV absorption ozone measurement with a 3 ppb LDL
  • Maintenance-free, expendable micro fuel O2 cell
  • Programmable concentration alarms
  • Programmable High and High-High alarm contacts
  • Self-check warning alarms
  • Temperature and pressure compensation (standard)
  • Built-in diagnostics
  • Menu driven software
  • Fast response times
  • Minimal zero drift
  • Optional Ethernet​


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

Internal Particulate FilterReplace6 months18.3
UV LampAdjustAs Indicated by ‘Check Lamp’ LED or status output8.4
UV LampReplaceAs required; when adjustment can no longer be performed.8.5
Sample PumpReplace2 years8.6
O3 Sensor Module ValveReplace2 years8.7
O2 sensorReplace1 year or as necessary8.8
Water Dropout Fileter (option)ReplaceAs needed8.9
1 When external sample line pre-filters are used.  If pre-filters are not used, internal sample filter should be replaced every month.


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
M465L + O2 Manual - 07795.pdf465L + O2 Manual2673 KB
SAL000077B - 465L Plus O2 Literature.pdf465L + O2 Specification3408 KB
SAL000077B-CN 465L+O2.pdf465L + O2规格 (Chinese Specification)3043 KB


Temperature Range
5 - 45°C​
Sample Flow Rate
800 cc/min
Relay Mode
Latching/Non-latching (selectable)
Power Requirements
100V-240V, 50/60Hz, 74W
Analog Output Ranges
0-5V or 4-20mA isolated output
High Current Relay Outputs
Form C Dry Contact, 250VAC/5A (System OK, Global HI Alarm, Global HI-HI Alarm)
​Included I/O
Optional I/O
Dimensions (HxWxD)
NEMA 4X - 16.85" (428 mm) x 15.60" (396 mm) x 6.90" (175 mm)
15.4 lbs (7.0 kg)
1 year
Measurement Principle
UV Absorption
0-1 ppm to 0-500 ppm
​± 1% of full scale
± 0.5% of full scale
Response Time
< 30 seconds to 95%
Lower Detectable Limit
 3 ppb
​​ Measurement Principle
B-3 Class Micro-fuel Cell​
​0-100% oxygen
​± 2% of full scale, constant temperature and pressure
​± 1% of full scale
​Response Time
​< 20 seconds to 90% at 25°C​
​Lower Detectable Limit
​Specifications are subject to change without notice.
All specifications are based on constant conditions.​



The Model 465L UV Photometric Ozone Monitor is an extremely stable analyzer, ideal for critical low-level ppm safety and process applications.  Its calibration is NIST traceable and the included pressure and temperature compensation ensure high accuracy under all conditions.  An integral micro fuel cell sensor provides accurate, continuous monitoring of O2 and allows measuring of both gases in a single instrument.

The Model 465L + Ohas been designed to deliver excellent performance, high reliability and simple operation.  Operating parameters can be easily set up in the field using the operator-friendly menu driven software.

Built-in diagnostics provide warning signals in case operating parameters are out of range.  Test values can be viewed while the Model 465L + O2 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.