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. - 120 VAC to 12 VDC Adaptor included.
  • 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.



- OA-1 Ozone Alarm Operation Manual

- OA-1 Ozone Alarm Brochure


More Information
Manufacturer Oxidation Technologies
Call For Price No
Gas Ozone (O3)
Resolution 0.1 ppm rage = 0.01 ppm, 1.0 ppm range = 0.01 ppm, 10 ppm range = 0.1 ppm range
Integrated Relays Yes
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
Audible Alarm Yes
Calibration Replace with Pre-Calibrated Sensor Annually
Sensor Life 1 Year
Range 3 ranges available, 0.1, 1.0 or 10.0 ppm
Unit Features

-Field Replaceable Sensor

-Audible Alarm

-4-20 mA Output

Sensor Range

0-0.1 ppm

0-1 ppm

0-10 ppm

Sensor Range

0-0.1 ppm (O3)

0-1 ppm (O3)

0-10 ppm (O3)

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