4-20 mA / 0-10 V analog loggers

Manual calibration

Efento 4–20 mA and 0-10 V loggers are factory-calibrated and provide accurate current measurements by default. However, if necessary, users may perform a manual calibration to further improve measurement precision. Calibration is carried out at four reference points (4 mA, 12 mA, 16 mA, and 20 mA for a 4–20 mA loggers and 1 V, 2 V, 6 V, 10 V for 0-10 V loggers) with a loop calibrator to supply the logger with a known, stable current / voltage.

To begin the manual calibration process, connect to the logger using the mobile application, then tap three dots in the upper-right corner → Advanced → Calibration → Manual calibration, select the channel you want to calibrate, and follow the on-screen instructions.

Perform manual calibration only if the current accuracy does not meet your requirements. Using a low-quality or unstable loop calibrator can degrade the logger’s accuracy by introducing incorrect reference values, resulting in poorer measurement performance.

Calibration parameters

Measurements Number	The number of samples used to calculate the average. The highest and lowest readings are ignored.	Range: 3 to 32.
Startup Time	The time (in milliseconds) the device waits after powering the sensor board before starting measurements.	Range: 0 to 300,000 milliseconds.
Factor	A multiplier used to convert the raw ADC reading into the final Voltage (mV) or Current (mA) result.	Range: 0 to 4,294,967,295 (Note: this value is the real factor multiplied by 1,000,000).
Always on	Keeps the power supply to the sensor board on constantly.	Disabled (uses Startup Time). Enabled (ignores Startup Time).