Appendix D
Operating Instructions ET-xx8 / MT-xx8
R. STAHL HMI Systems GmbH / OI_ET_MT-xx8_en_V_01_02_03.docx / 10.03.2021
Page 67 of 84
20 Appendix D
20.1 Variation of operating temperature range
The devices' operating temperature range is impacted by how they are mounted, and the
minimum and maximum permitted operating temperature may vary depending on their mounting
type.
These values are listed in the table below.
Exposure to direct sunlight might contribute to a further heating up of
the device and may result in a further reduction of the maximum
permitted operating temperature !
We recommend you protect the device from direct sunlight !
Wind may cool down the device and thus have an impact on the
minimum operating temperature.
The storage temperature is not impacted by the type of installation.
As a rule:
LTC
=
Lower ambient temperature in °C
-40 °C for devices with integrated heater
-10 °C for devices without heater
LTF
=
Lower ambient temperature in °F
-40 °F for devices with integrated heater
+14 °F for devices without heater
HTC =
Highest permissible ambient temperature in °C
HTF
=
Highest permissible ambient temperature in °F
Display orientation
Inclination
Description
Highest permissible
ambient temperature
Landscape,
horizontal 90°,
standing free
HTC = +65 °C
HTF = +149 °F
Landscape,
horizontal 45°,
standing free
HTC = +60 °C
HTF = +140 °F
Landscape,
horizontal 0°,
standing free,
minimum gap
10 cm below
device
HTC = 60 °C
HTF = +140 °F
NOTE
