​Model 465H

​ Process Ozone Monitor



  • UV Absorption Method
  • Microprocessor controlled
  • Menu driven software
  • Ranges 0-5 to 0-25% w/w
  • Built-in diagnostics
  • Self-check warning alarms
  • Fast response times
  • Minimal zero drift
  • Programmable auto-zero function included
  • 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.

Item Action Frequency Cal Check Manual Section
1Particulate filter Change particle filter Weekly No 10.3.1
Verify test functions Review and evaluate Weekly No 10.2; Appendix C 
Zero/span check Evaluate offset and slope Weekly --  9.3, 9.6, 9.9
1Zero/span calibration Zero and span calibration Every 3 months --  9.2, 9.4, 9.5, 9.7, 9.8
1External zero air scrubber (optional) Exchange chemical Every 3 months No 10.3.3
1Perform flow check Check Flow Every 6 Months No 10.3.7
Internal IZS Permeation Tube  Replace Annually Yes 10.3.2
Perform pneumatic leak check Verify Leak Tight Annually or after repairs involving pneumatics Yes 10.3.6
2Pump diaphragm Replace Annually Yes  Refer to diaphragm kit instructions
 Calibrate UV Lamp Output Perform lAMP CAL  Prior to zero/span calibration or PMT hardware calibration --  5.9.6 &
3PMT sensor hardware calibration Low-level hardware calibration On PMT/ preamp changes  if Yes
0.7 < slope or
slope >1.3
1Sample chamber optics  Clean chamber, windows and filters As necessary Yes &
1Critical flow orifice & sintered filters Replace As necessary Yes 10.3.4


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.




M465H Manual - 06161.pdf465H Manual2607 KB
SAL000020C - 465H Sales Literature.pdf465H Specification3170 KB


Measurement Principle
UV Absorption (Beer Lambert Law)
0-5% w/w to 0-25% w/w
0-100 g/Nm3 to 0-400 g/Nm3
 Measurement Units
% w/w, g/Nm3
​​​​ Accuracy
​± 1% of full scale

± 0.5% of full scale​​

Display Resolution
0.01% w/w, 0.1 g/Nm3
Response Time
< 30 seconds to 95%
Pressure, Temperature
(NTP = 273.15K, 760mmHg)
​​Gas Inlet Pressure Range
3.0 - 30.0 psig​
Gas Flow R​ate
0.2 - 2.0 LPM
Temperature Range​ 5 - 45°C
Dimensions (H x W x D)

Rack Mount – 5.22" (133 mm) x 19" (483 mm) x 18.6" (473 mm)
NEMA 4X – 16.85" (428 mm) x 15.60" (396 mm) x 6.90" (175 mm)

​Weight ​Rack Mount – 13.3 lbs (6.0 kg)
NEMA 4X – 15.0 lbs (6.8 kg)
Power 110-240V, 50/60Hz, 74W
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

​Degree of Protection (NEMA)
IP65 (NEMA 4X)​
Approvals CE

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


The Model 465H is a microprocessor based high concentration ozone monitor for measuring ozone in process gas streams in water treatment, food processing, and research applications.  The 465H has been designed to give accurate and stable readings over long time periods with little or no maintenance or calibration.  The Model 465H is available in a 19” rack mount or NEMA 4X wall mount enclosure.

The sensor module contained in the Model 465H 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.  This unique design provides a sensor which will operate for extended periods without calibration or maintenance.

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