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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Ozone Switch

Ozone Switch

Product Code:OS-4

Need more Info? (514) 354-2511 - 1-800-463-4363

Acts like a thermostat to control ozone generators and alarms based on adjustable ozone concentration set-points. Ozone ppm readout via digital meter. Simple and inexpensive.


  • Easy to install. Minimal adjustments.
  • Sensor is in a replaceable precalibrated module. Separated by a cable, the instrument is not in the high ozone area.
  • Sensor reading is temperature and relative humidity compensated.
  • Replacement sensor is miniature, low cost, precalibrated and also fits our A-22.
  • Operates from 12-24 VDC or from AC adapters available worldwide.
  • Alarms, data loggers, and other accessories available.
  • Programmable turn-on and turn-off set-points.
  • Indication when .1 ppm safety standard exceeded.


Typical Applications

  • Monitor ozone levels in treatment storage areas for fruits, vegetables, and other agricultural products. Monitor ozonated HVAC systems. General monitoring at .03-20 ppm.
  • Control the output of ozone generators using the set-point controlled relay in the OS-4.
  • Use as either ozone leak alarm or ozone failure alarm for all sizes of ozone generators.
SM-4 sensing module located up to 100 meters from the OS-4



Range and Accuracy .03-20 ppm of ozone
Accuracy 0-15% (Depends on application)
Temperature and humidity 5-40°c 20-95% RH
Measurement Principle HMOS (heated metal oxide semiconductor) sensor
Size 127 * 64 * 42 mm (5 * 2.5 * 1.625 in)
Weight 200 gr (7 oz)
Power Requirements 12-24 VDC, 300 mA. AC adapters available
Output control
  • SPDT non-latching relay. Contacts rated at 5 amps, 250 VAC.
  • .1 ppm danger alarm: Panel LED and SPDT relay 5 amp contacts.
Connections Terminal blocks for relay output and DC input. 2.5 mm DC power jack for AC adapter.
Indicators Green LED: instrument on. Yellow LED: >.1 ppm. Red LED: generator on.
Outputs 0-2 V, 4-20mA, RS-232 digital.
Case Flame-resistant ABS with mounting ears.
Not recommended for use in the presence of strong acid gases or VOC fumes.


Tags: Ozone, Switch

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