OA-1 Ozone Alarm

The Ozone Alarm is the perfect is a perfect human safety alarm with a built-in audible alarm and visual strobe light to alert of unsafe ozone levels.  The OA-1 Ozone Alarm features user settable alarm point, auxiliary relay for external system control, and a 4-20 mA output.

As low as $750.00

The OA-1 ozone alarm is a fixed mount device with an audible alarm and visual strobe light designed specifically for use in human safety applications.  This device features a user-settable alarm point with an auxiliary relay to control external devices such as fans, ozone generators, etc. The relay and alarm trigger together at the user-selected ozone set-point.

A large display is available to indicate both current ozone levels, and a trend of ozone levels over the last 12 hours of operation via a colorful graph.



-  Red strobe light will alert of ozone levels above set-point

- Audible siren will alert of ozone levels above set-point

- Volume can be adjusted simply by turning the cover of the siren

- User-settable alarm set-point

- Auxillary relay (10-amp) can be used for external control, relay triggers simultaneously with the alarm set-point

- Optional display indicates current ozone level and trend of ozone levels over the last 12 hours Built-in fan will actively draw sample air past the ozone sensor

-  Three separate ranges available

     - 0-0.1 ppm

     - 0-1.0 ppm

     - 0-10.0 ppm

  • -  4-20 mA output linear with ozone output
  • - Field Replaceable Sensor (never remove the unit from service for calibration)



    • Range: three ranges available
      •    - 0-0.1 ppm
      •    - 0-1.0 ppm
      •    - 0-10.0 ppm
    • Resolution: Range dependent
      •    - 0.1 ppm range = 0.01 ppm resolution
      •    - 1.0 ppm range = 0.01 ppm resolution
      •    - 10.0 ppm range = 0.1 ppm resolution
    • Graphic Display: Indicates the current ozone level and past 12 hour trend graph
    • Response time: Within 8 seconds
    • Measurement principle: HMOS (heated metal oxide semiconductor) sensor
    • Size: 11" long x 4.5" deep x 8" wide
    • Weight: 1 lb
    • Power requirements: 12 VDC at 300 mA. AC adapters available worldwide.
    • Relay Outputs: 10 amp relay 
    • Analog output: 4-20 mA output linear with ozone level
    • Calibration: Replace your sensor annually 


    Replaceable Sensor:

    The OA-1 Ozone Alarm uses the SM-3 Sensor for ozone detection.  This is a field-replaceable sensor chip that can be replaced every 6-months - 1-year to maintain ozone detection accuracy without ever having to remove the OA-1 from service.  Simply pull the old sensor off, and replace it with new at a cost comparable to calibration. 

    As the replacement sensor has a similar cost to calibrating an existing sensor, long-term sensor + calibration cost will be lower than any other comparable sensor options that require calibration, then, eventual sensor replacement.

    SM-3 Field Replaceable sensor


    Data Logging:

    Data logging with the OA-1 Ozone Alarm is possible with an external data logger such as the DL-3.  Using the 4-20 mA output signal from the OA-1 the DL-3 can log and save gas measurements. 

    DL-3 Ecosensors data logger


    Wireless Monitoring & Data Logging Kit

    Use the Wireless Monitoring & Data logging Kit with your fixed mount monitor to connect it to the internet allowing access from anywhere. Receive Instant notifications with free text and email alerts. This is a great addition for your fixed mount gas detector.


    Use this kit to connect your Fixed mount gas detector to the internet allowing remote access from anywhere.


More Information
Manufacturer Oxidation Technologies
Call For Price No
Gas Ozone (O3)
Sensor Range

0-0.1 ppm

0-1 ppm

0-10 ppm

Sensor Features

-Field Replaceable Sensor

-Audible Alarm

-4-20 mA Output

Range 3 ranges available, 0.1, 1.0 or 10.0 ppm
Resolution 0.1 ppm rage = 0.01 ppm, 1.0 ppm range = 0.01 ppm, 10 ppm range = 0.1 ppm range
Audible Alarm Yes
Integrated Relays Yes
Calibration Replace Sensor Annually
Sensor Life 1 Year
Response Time 8 seconds
Sensor type Electrochemical
Sampling Method Diffusion
Alarms User settable relay turns alarm strobe and audible alarm ON, also includes 5 amp relay for customer use
Operational Temperature Range 35 - 100 deg F
Operational RH Range 0 - 85% RH
Power Requirements 120 VAC (220 VAC available)
Field Replaceable Battery No
Warranty 1 Year
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