Short press: switch between Celsius (°C) or Fahrenheit (°F)
Long press: activate or de-activate the buzzer alert
Calibration
When the device is turned off, long press the 3 buttons at the same time to enter the calibration mode (around 200sec). The Nomestic PTH-9C will start to
calibrate within the first 24 hours during connection with the power cable. For optimal calibration during the first 24 hours, please position the monitor in a well-
ventilated room, for example next to a window or door. This is particularly important to determine the baseline measurement. In addition, please put the device
in a room with as less people or animals as possible. After the first 24 hours, the CO
during the coming days. Please consider to occasionally ventilate the areas where the monitor is positioned.
Nomestic® PTH-9C CO2 meter - Instruction Manual/Handleiding
When the detected CO
2
detector will buzzer to indicate that the CO
the safe scale.
monitor will be calibrated at an optimal level but can still auto-calibrate