Fuel Gas Analysers

How can I enable the fast charging on the K455GR gas analyser?

The K455GR gas analyser is now fast charging.

K455GR Αναλυτής Καυσαερίων με μακράς διάρκειας αισθητήρια
  1. We connect the K455GR exhaust gas analyzer to the power supply.
  2. Press the On/Off button two instantaneous repeated times until it is displayed "Battery Charging".
  3. We then press * until we hear "beep" and it is displayed +.