Thermocouples

The following parameters allow you to configure thermocouples connected to Efento logger. These settings ensure accurate temperature readings by selecting the correct thermocouple type, curve standard, excitation current, and optional stabilization delay.

If the logger is supplied by Efento together with RTD probes, it is already calibrated to that specific probe type and will provide accurate measurements out of the box. The calibration parameters described below should be adjusted only when the logger is used with user-supplied or custom probes.

Thermocouple type	Specifies the thermocouple variant connected to the device.	Thermocouple type: B, E, J, K, N, R, S, T
Curve type	For each type of RTD (Resistance Temperature Detector) curve there is an equation that describes the relationship between resistance (R) and temperature (T) of RTD. The type of the curve depends on the material the probe is made of and is used for calculating temperature values ​​based on resistance.	European standard, American, Japanese, ITS 90.
Excitation current	Sets the measurement current supplied to the RTD sensor. For PT10 / PT1000 probes, the appropriate Excitation Current depends on the wiring method: 2-wire and 4-wire probes: 100 µA 3-wire probes: 50 µA After adjusting the excitation current, verify the readings in the Efento mobile app. If a measurement error appears, decrease the Excitation Current by one step and test again.	5 µA, 10 µA, 25 µA, 50 µA, 100 µA, 250 µA, 500 µA, 1 mA.
Extra delay	Adds a delay (in 100 µs steps) between powering the sensor and taking the measurement. If additional capacitance is introduced—for example, by using a longer RTD probe—this parameter adjusts the extra time needed for the measurement circuit’s capacitors to charge properly.	Range: 0 (no delay) to 255 (255 000 µs).
Open circuit current	Open circuit current is used to detect fault in thermocouple probes.	10 µA, 100 µA, 500 µA, 1 mA