SONOFF DS18B20 Waterproof temprature sensor (RJ9 4P4C connector)


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SKU: 1527154
  1. Model: SONOFF DS18B20
  2. Temperatures Range: -55 to +125ºc
  3. Accuracy from -10 to +85ºc
  4. Material: Stainless steel (Probe)
  5. Weight: 26g


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Brand: Sonoff
Category: Temperature & Humidity Sensor

Sonoff DS18B20 is a waterproof temperature sensor, compatible with Sonoff TH16R3 and TH20R3 smart relay switches. Due to its waterproof design, it reliably operates in wet conditions, e.g. in water tanks, aquariums, cooling rooms, pools, etc. Sensor made of stainless steel, long-term durability, extra sensitivity to all temp-changes.

Temperature range from -55℃ to 125℃, and remains reliable in extreme high and low temp conditions. The cost-efficient solution to integrate with Sonoff smart relays and trigger temperature-based automated turn ON / OFF. The sensor has an RJ9 connector, which fits Sonoff TH16 R3 / TH20 R3 relays’ sockets.

With the help of the eWeLink app, you can create any temp-based settings that trigger automated turn ON / OFF of TH16 and TH20 relays or other connected relays like an S26 smart socket. A perfect choice to control ventilators, electric heaters, radiators, humidifiers, dehumidifiers, air conditioners, sprinklers, and aquariums.

The total length of the Sonoff DS18B20 temperature sensor (from the connector to the sensor’s edge): approx. 45-50 cm.

Sonoff DS18B20 waterproof temperature sensor is recommended to the following products:

  • Sonoff TH16 R3 (Origin and Elite versions) WiFi-equipped, smart switch relay remotely controllable via the Internet,
  • Sonoff TH20 R3 (Origin and Elite versions) WiFi-equipped, smart switch relay remotely controllable via the Internet, with higher output than TH16R3.


  1. Power Applicability: The waterproof temperature sensor is available for SONOFF TH Elite/TH Origin to detect and measure the temperature.
  2. Wider Measuring Range: Measuring range from -55℃ to +125℃ to enable use in a wider scope of applications. Easy to install.
  3. Super-durability & Long-lifespan: The stainless steel probe is water-resistant, anti-corrosion and rust-proof which can be used in a moist environment.
  4. Enough Cable Length: The 50cm cable allows you to connect the device which is farther from the switch.
  5. Easy To Use: Just plug into TH Elite/TH Origin.

Package Includes:

1 x SONOFF DS18B20 Waterproof temprature sensor (RJ9 4P4C connector)

SKU: 1527154 Category:
Temperatures Range

-55 to +125ºc


-10 to +85ºc


Stainless steel (Probe)



Cable Length


Shipping Weight 0.04 kg
Shipping Dimensions 8 × 6 × 4 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China