Disconnect the unit's power supply. Before powering on again, connect the
PRG wire to the +Us. After powering on first the green, then the yellow and
then the red LEDs will start blinking one after another. Wait until all three LEDs
stop blinking and disconnect the PRG wire from +Us. The device will now
measure using the default factory settings. Reconnect the PRG wire to the
GND.
In a very noisy environment, before powering on, make sure that the PRG wire
is connected to the GND, otherwise on powering on, the device may load the
default factory settings.