Brahma Immersion NTC temperature sensor 18200500

This immersion NTC temperature sensor (SKU 18200500) from Brahma is designated ST10 and NTC110. It measures the temperature of the heat transfer fluid in heating boilers and hot water systems, transmitting data to the control board. The sensor has a red connector, dimensions 40 x 20 x 20 mm, net weight 0.01 kg and gross weight 0.015 kg. It is compatible with Baxi, Beretta, Bosch and Buderus boilers, as well as models such as duo-tec, compact eco, compact city, city j, mynute, u072-18k, 24k, 28k and wbn6000.

Sensors of this type are selected by their resistance characteristic (for example, 10 kΩ or 12 kΩ at 25 °C) and mechanical form: immersion probes for direct water contact, clamp-on probes for pipe surface, or sleeve probes for insertion into a pocket. Cable length and connector type must also match the original. Before ordering, verify the resistance at a known temperature and confirm probe form, cable length, and connector match the application.

Typical failures include a drifting characteristic that causes the boiler to modulate incorrectly, broken internal wiring, or loss of thermal contact in clamp-on probes. A poor connection or damaged cable can produce erratic readings or a fault code. Check the sensor's resistance at a known temperature and inspect the cable and connector.