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The surface sensor is used to measure surface temperature. It is delivered with a cable 1.5 m long and a clamp (max. Diameter 40 mm).
The type of sensor is thermistor temperature sensors (NTC), in which a ceramic sensitive element (NTC) is used for measurement, the resistance of which decreases with increasing temperature.
The on-board temperature sensor TG-A130 serves to protect the water heater from freezing of the coolant. It is fastened with a mounting ring in the immediate vicinity of the outlet pipe of the return water of the water heater.