Which Shelly devices is the DS18B20 probe compatible with?

The probe is a 1-Wire accessory and is used with a Shelly Plus Add-on (next to a Shelly relay such as Shelly 1, 1PM, Plus 1 or Gen3/Gen4 models) or with a Shelly Uni. It does not work on its own.

How many DS18B20 probes can I connect to one Shelly Plus Add-on?

Up to 5 DS18B20 probes on the same Shelly Plus Add-on, since each has a unique 64-bit address on the 1-Wire bus.

Can I use the probe outdoors or in water?

Yes, the stainless-steel housing and moisture-resistant cable allow outdoor mounting or contact with liquids; we still recommend properly insulating the electrical connections at the host device.

What is the cable length and probe thickness?

The cable is 1 metre and the probe diameter at its thickest point is 6 mm, so it fits most standard thermowells. There are also 3 m variants if you need more distance.

Does the probe need a separate power supply?

No. The DS18B20 probe is powered and read through the 1-Wire terminals of the host device (Shelly Plus Add-on or Shelly Uni); wiring on live circuits should be done by an electrician.

Shelly DS18B20 Temperature Sensor 1 m

Name: Shelly Temperature Sensor DS18B20 (1 m cable) for Shelly Add-on
Brand: Shelly
SKU: SHELLY-DS18B20-1M

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What it is, who it's for, what it does

About this product

The DS18B20 temperature sensor is a digital probe on a 1-metre cable, designed as a wiring accessory for Shelly devices with a 1-Wire input. It does not work on its own: it connects to a Shelly Plus Add-on or a Shelly Uni, which reads the value and forwards it to the app.<br><br>The DS18B20 chip covers a wide span, from -55 to +125 degrees Celsius, with a typical accuracy of plus/minus 0.5 degrees between -10 and +85 degrees Celsius. The stainless-steel housing and moisture-resistant cable make it suitable for boilers, pipes, fridges and outdoor placement.<br><br>The 1-Wire bus uses a single data line plus ground, and every probe carries a unique 64-bit address, so up to 5 DS18B20 sensors can be wired to one Shelly Plus Add-on for multi-zone monitoring.

Delivery
Free from 1500 MDL
Returns
30 days to return
Warranty
24 months

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Where it works

Use cases

Chisinau flat with an electric boiler and a Shelly Plus Add-on plus Shelly 1PM

The probe measures boiler water temperature and the Shelly relay starts heating at the night tariff.

House with gas heating and a Shelly Plus Add-on with two DS18B20 probes

Two probes on flow and return show how well the radiators release heat.

Country cabin monitored remotely through the Shelly app

The probe tracks fridge temperature and sends an alert if it crosses the threshold.

For the installer

Technical specifications

full spec · wiring · datasheet

Other

Senzor / chip: DS18B20 digital 1-Wire
Rezolutie: 9...12 (programabil) bit

Environment

Interval de masurare: -55...+125 °C
Precizie: ±0,5 (intre -10 si +85 °C) °C

Physical

Lungime cablu: 1 m
Diametru sonda: 6 mm
Carcasa: Otel inoxidabil, cablu rezistent la umiditate

Connectivity

Interfata: 1-Wire (1 linie de date + masa), adresa 64-bit
Compatibilitate: Shelly Plus Add-on, Shelly Uni
Senzori max. pe Shelly Plus Add-on: 5 buc

Full device datasheet

Support

Frequently asked questions

Which Shelly devices is the DS18B20 probe compatible with?
The probe is a 1-Wire accessory and is used with a Shelly Plus Add-on (next to a Shelly relay such as Shelly 1, 1PM, Plus 1 or Gen3/Gen4 models) or with a Shelly Uni. It does not work on its own.
How many DS18B20 probes can I connect to one Shelly Plus Add-on?
Up to 5 DS18B20 probes on the same Shelly Plus Add-on, since each has a unique 64-bit address on the 1-Wire bus.
What temperature range does the sensor measure?
The DS18B20 chip measures from -55 to +125 degrees Celsius, with a typical accuracy of plus/minus 0.5 degrees between -10 and +85 degrees Celsius.
Can I use the probe outdoors or in water?
Yes, the stainless-steel housing and moisture-resistant cable allow outdoor mounting or contact with liquids; we still recommend properly insulating the electrical connections at the host device.
What is the cable length and probe thickness?
The cable is 1 metre and the probe diameter at its thickest point is 6 mm, so it fits most standard thermowells. There are also 3 m variants if you need more distance.
Does the probe need a separate power supply?
No. The DS18B20 probe is powered and read through the 1-Wire terminals of the host device (Shelly Plus Add-on or Shelly Uni); wiring on live circuits should be done by an electrician.

Same category

Questions about this product?

A CasaSmart manager calls you within 1–2 working hours and answers anything — compatibility, install, alternatives.

+373 60 944 922

Updated: 18 June 2026· reviewed by CasaSmart Expert Team