> For the complete documentation index, see [llms.txt](https://docs.efento.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.efento.io/efento-ble-loggers/using-loggers/special-settings-by-sensor-type/low-high-temperature-pt100-pt1000-pt....md).

# Low / high temperature (Pt100/ Pt1000/Pt...)

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

{% hint style="info" %}
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.
{% endhint %}

| PT Sensor Type     | Specifies the RTD sensor variant connected to the device.                                                                                                                                                                                                                                                                                                                                                                                                           | PT10, PT50, PT100, PT200, PT500, PT1000 sensor.          |
| ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------- |
| 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 | <p>Sets the measurement current supplied to the RTD sensor. For PT10 / PT1000 probes, the appropriate Excitation Current depends on the wiring method:</p><ul><li><strong>2-wire and 4-wire probes:</strong> 100 µA</li><li><strong>3-wire probes:</strong> 50 µA</li></ul><p>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.</p> | 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).                 |


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