​Model 465L

Single/Multi-Channel Industrial Safety Ozone Monitor​​​

465L.png ​


  • UV Absorption Method
  • Microprocessor controlled
  • Menu driven software
  • Lower detectable limit 3 ppb
  • Programmable High and High-High alarm contacts
  • Built-in diagnostics
  • Self-check warning alarms
  • Fast response times
  • Minimal zero drift
  • 1, 3 and 6 stream versions available for safety monitoring
  • 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.

Internal Particulate FilterReplace6 months19.3
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
Sensor Module ValveReplace2 years9.7
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.




465L APP NOTE_04.02.2020.pdfOzone for Sterilization and Disinfection152 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
M465L Manual - 05509.pdf465L Manual1713 KB
SAL000021D - 465L.pdf465L Specification2948 KB
SAL000021D-CN - 465L.pdf465L规格 (Chinese Specification)3221 KB
SAL000021E-CN 465L.pdf465L规格 (Chinese Specification)3256 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)
 Measurement Range
0-1 ppm to 0-500 ppm
ppmv, ppbv, pphm, ug/m3, mg/m3
​​​ Precision / Repeatability
​± 0.5% of full scale
± 1% of full scale
Lower Detectable Limit
0.003 ppm
Display Resolution
0.001 ppm
Response Time
< 30 seconds to 95%
​Zero Drift .005 ppm/month, non-cumulative
(.050 ppm/month Ranges >20 ppm)
​​Temperature Range
5 - 45°C
Relay Mode
Latching/non-latching, operator selectable
Stream Selector Cycle Time
1 min. to 6 min., operator selectable
​Sample Flow Rate
0.8 liters/minute
100-240VAC, 50/60Hz, 74W
Analog Output
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)
Low Current Relay Outputs
    (3 or 6 channel, 3 per channel)

SPST Dry Contact, 50VDC/250mA Resistive Load (Channel ID, HI Alarm, HI-HI Alarm

Status Outputs System OK, Invalid Reading, Pneumatic Fault, UV Lamp Fault 
Dimensions (HxWxD)

Rack Mount - 5.22" (133 mm) x 19" (483 mm) x 15.3 (388 mm)
NEMA 4X - 16.85" (428 mm) x 15.60"​ (396 mm) x 6.90" (175 mm)


Rack Mount - 12.6 lbs (5.73 kg)
NEMA 4X - 15.1 lbs (6.85 kg) ​​

​​​ Stream ID Outputs
Channel 1 through 6​
RS-232 (Optional RS-485)
57.6 Kbaud, DB-9 connector​
​​​ Approvals                    
​​​​Degree of Protection (NEMA)              
IP65 (NEMA 4X)​ 
​​ Warranty
1 year​

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.

The Model 465L is available in a 19” rack mount or NEMA 4X wall mount enclosure and can be purchased either as a single stream unit or as a multi-channel unit capable of monitoring up to six individual sample streams. The Model 465L has 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 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.