OS-4 Ozone Switch

R27,900.00 Excl. VAT


This 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 effective. Ships with SM-7/SM-EC 0-20 ppm sensor module.

This is imported on order with lead time of 2-4 weeks.

SKU: OS-4 Categories: ,
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-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, and pre-calibrated.
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.


-Range and Accuracy: .03-20 ppm of ozone.
-Accuracy: 10-15% (Depends on application).
-Temperature and humidity: 5-40°c 20-95% RH
-Measurement Principle: SPEC (Screen Printed Electrochemical) 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.
-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.

Additional information

Weight 3 kg
Dimensions 31 × 31 × 21 cm