# Temperature sensor probe FF SONDA RT for RT-820 / RT-821 / RT-822 controllers (SONDA RT)

**URL:** https://aio.lv/en/product--ff-sonda-rt--12109410
**Data updated:** 2026-03-20 10:00 (EET)
**Category:** Smart Sensors
**Manufacturer:** FF
**Manufacturer code:** SONDA RT
**EAN:** 5908312595731
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 16.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 14.04 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-sonda-rt--12109410

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

Replacement temperature sensor probe FF SONDA RT designed for use with RT-820, RT-821 and RT-822 controllers. The probe provides temperature measurement input for compatible regulator models and is intended for monitoring and control tasks in heating and temperature-regulated systems. Suitable for installation where OEM-compatible sensing is required.

## Long description

Replacement temperature sensor probe FF SONDA RT is designed for use with RT-820, RT-821 and RT-822 controllers. The probe provides a temperature measurement input for compatible regulator models and is intended for monitoring and control tasks in heating and temperature-regulated systems. It is suitable where an OEM-compatible sensing element is required to maintain accurate feedback to the controller.
Advantages
The probe delivers stable temperature readings to the paired controller, enabling consistent regulation of heating circuits. Its design focuses on compatibility with RT-820, RT-821 and RT-822 regulator inputs, simplifying replacement and service operations. The sensor construction is intended for straightforward installation and reliable long-term operation in typical HVAC and temperature-control environments.
Suitable for
Temperature sensing for RT-820, RT-821 and RT-822 controllers
Replacement of original or damaged temperature probes in heating systems
Feedback input for boilers, circulation pumps and thermostatic control loops
Temperature monitoring in residential and light-commercial HVAC applications
Key specifications
Function: temperature sensing for controller input
Compatibility: designed to work with RT-820, RT-821 and RT-822 regulator models
Application environment: heating systems and temperature-regulated installations
Mounting type: probe-style sensor for inline or insertion installation (as per controller wiring and mounting options)
How to use
Install the probe according to the controller manufacturer’s wiring diagram and mounting instructions, ensuring proper electrical connection to the designated sensor terminals on the RT-820/RT-821/RT-822 device. Place the sensing element in the medium or location representative of the temperature to be measured, secure the probe mechanically if required, and verify correct controller response after power-up. Follow any grounding or shielding practices recommended by the controller manual to reduce electrical interference and ensure accurate readings.
Usage recommendations
Verify compatibility and correct sensor wiring before replacing an existing probe. Inspect the probe and connection points periodically for wear or corrosion and consult the RT-series controller manual for calibration, diagnostic checks, and environmental limits to maintain reliable temperature control.

## FAQ

### How much does the FF SONDA RT temperature probe for RT-820/RT-821/RT-822 cost, and is it available for purchase?

The price is 16.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 02.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All FF products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized FF service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12109410/67645405_large.webp