Introduction
The SM70 is a low-maintenance monitor with no user-serviceable components.
It comes with one of three ozone sensors:
- Ozone 0-0.15ppm
- Ozone 0-0.5ppm
- Ozone 0-10ppm
As the ozone sensor in the SM70 can’t be calibrated, you need to replace the entire sensor board once a year, or sooner if you suspect it isn’t working properly. Replacement sensor boards come with a factory calibration certificate.
Note: You can test the operation of the sensor using a bump test. This typically involves brief exposure of the sensor to a known quantity of gas and making sure the monitor reading corresponds with that concentration. Unlike calibration, there’s no adjustment of the monitor in response to the level of gas detected.
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Remove the lid from the SM70 by unscrewing the 4 lid screws.
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Unscrew the sensor board from the back of the lid using a 5.5mm hexa-socket screwdriver. Use a flat head screwdriver to hold the 2 screws in place as you unscrew.
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Keep the screws, nuts, washers and standoffs for re-use.
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Remove cabling.
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Connect cabling to the new sensor board.
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Place the sensor board into the lid enclosure, ensuring the screws slide through both holes so the board is resting on the plastic standoffs underneath.
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Make sure the sensor board doesn't rest on the connectors.
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Use a flat head screwdriver to hold the screws in place while tightening.
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Remember to replace the brown washers.
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For further support, contact Technical Support.
For further support, contact Technical Support.
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