The SM-X ozone sensor was a replacement sensor for the OS-4, OS-6, and A-22. However, the SM-X is no longer in production and is now obsolete.
The SM-6 also used the SM-X as a replacement sensor and also no longer available for purchase.
The replacement ozone sensor SM-X (also known as the SM-X-20 or SM-X-2) was paired with EcoSensors OS-4 Ozone Switch, OS-6 Ozone Controller, and A-22 Ozone Monitor. The following options are now available instead:
A-22 Ozone Monitor
The A-22 is obsolete and there is no replacement sensor option available. We recommend the following as comparable ozone monitor options to replace your A-22:
D-16 with Ozone 0-20 ppm – https://www.oxidationtech.com/d-16-gas-detector.html
S-300 with EOZ 0-10 ppm – https://www.oxidationtech.com/aeroqual-series-300.html
OS-4 Ozone Switch & OS-6 Ozone Controller
The OS-4 and OS-6 Ozone Detectors can be upgraded to use the SM-7/SM-EC electrochemical sensor as an ozone replacement sensor to the SM-6/SM-X. The new SM-7 will need to be connected to the OS-4 and OS-6 via the wired cable.
There are two range options for the new SM-7/SM-EC sensor: 0-20ppm or 1-50ppm. Both range options can be used with the OS-6, but only the 0-20ppm can be used with the OS-4. After you have upgraded to the SM-7/SM-EC then only replacing the SM-EC sensor that’s inside of the SM-7 needs to be done for future sensor replacement.
The SM-7/SM-EC ozone sensors should be replaced annually as the sensor calibration is good for up to 1 year.
Feel free to contact us with any questions that you have about the SM-X ozone sensor being discontinued.