OS-4/SM-EC, Ozone Switch, 0.03 - 20ppm

Item number: OS-4/SM-EC

  • measuring range: 0.03 - 20ppm
  • resolution: 0.01ppm
  • can be used as a 2-point controller for ozone
  • remote sensor
  • replaceable precalibrated sensor SM-EC
  • relay switching outputs
  • outputs: 4-20mA; 0-2VDC; RS-232 digital
  • Category: Near-Earth Ozone

    1.550,57 €

    including 19% VAT.

    Exp. shipping time: ca. 2-3 weeks

    : 7 workdays



    OS-4/SM-EC, Ozone Switch, Ozone Controller, 0.03 - 20ppm

    Acts like a thermostat (2-point controller) to control ozone generators and alarms based on adjustable ozone concentration set-points. Ozone ppm readout via digital meter. Simple and inexpensive.
    Usually the OS-4 is mounted outside the ozone area.
    The OS-4 ozone switch is supplied together wit the digital interface SM-7 and the electrochemical sensor SM-EC

    Practical, inexpensive and time-saving: 
    For recalibration it is no more necessary to return the device to the manufacturer. There is an optional precalibrated accessory available, a  replacement ozone sensor module SM-EC, which is simply used only in place of the old module, and then the device is calibrated again!


    • 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.
    • The SM-7 sensor interface supplied with a connected 1,60m cable but can also be located up to 8 meters from the OS-4
    • Sensor reading is temperature and relative humidity compensated.
    • Replacement sensor is miniature, low cost, precalibrated and also fits our model OS-6/SM-EC
    • 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 0.1 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 0.03-20ppm.
    • 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.

    Technical data:
    Measuring range: 0.03-20ppm of ozone
    Sensor measuring principle: electrochemical
    Resolution: 0.01ppm
    Sensitivity: 0.03ppm
    Accuracy: ±20% of reading or 0.01ppm, whichever is greater
    Recommended temperature range: +10 to +30°C; 20-95% RH
    Recommended humidity range: 30-60% RH
    Size: 127 × 64 × 42mm³ (5 × 2.5 × 1.625in³).
    Housing size ext. sensor (SM-7): H = 128mm W = 63mm, D = 25mm plus mounting flanges
    Weight: 200g (7oz)
    Power Requirements: 12-24VDC, 300mA. AC adapters available.
    Output control: SPDT non-latching relay. Contacts rated at 12A, 250VAC.
    0.1 ppm danger alarm: Panel LED and SPDT relay 5A 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: >0.1 ppm. 
                      Red LED: generator on.
    Outputs: 0-2V, 4-20mA, RS-232 digital.
    Case: Flame-resistant ABS with mounting ears.

    Not recommended for the use in presence of strong acid gases.

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