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Rapid Online - Rapid Electronics Ltd.£29.86Visit shop Kemo M173 Soil Moisture Humidity Sensor Relay Switch Module
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The Kemo M173 is an ideal solution for gardeners and automation enthusiasts looking to maintain precise soil moisture levels for plants, greenhouses, or garden beds. By leveraging a dedicated soil probe, the system automates irrigation cycles to prevent over or under-watering, ensuring optimal growth conditions. While highly effective at managing automated watering, users should note that the device requires a 12V DC power source and may need integration with an external timer if they wish to restrict operation to specific times of the day.
| Model Part Number | M173 |
|---|---|
| Brand | Kemo |
No, the M173 requires an external 12V DC power supply which must be purchased separately.
The M173 relay is designed for 12V DC loads. If you are using an AC valve, you would need an additional relay or contactor to bridge the connection.
The probe should be placed at the root level of the plants you are monitoring for the most accurate moisture feedback.
Yes, it is designed for continuous operation, though using an external timer is recommended to restrict usage to appropriate watering hours.
The device will stay in a pause cycle, re-evaluating the soil moisture every 25-30 minutes, and will not activate the pump until the soil dries out.
Check the sensor probe connections for corrosion or verify that the probe is fully inserted into the soil without air gaps.
Verify that the 12V power supply is providing sufficient voltage and check that the relay output is wired correctly to the pump.
Ensure that the extended wire is of a sufficient gauge to maintain signal integrity over the distance and that joints are tightly secured.
To set up the Kemo M173, first connect your 12V DC power source to the module and attach your water pump or valve to the relay output. Bury the sensor probe at the depth of the root ball to ensure representative readings. If you need to extend the sensor, use a high-quality 2-way wire and ensure all connections are waterproofed to prevent oxidation. The device requires minimal maintenance, though you should occasionally inspect the sensor probe for mineral buildup or soil compaction that might skew readings. Ensure the module itself is housed in a dry, protected enclosure to prevent moisture damage to the electronic components.
