Please keep a proper temperature and humidity in the equipment room. Too high/low 
humidity may lead to bad insulation, electricity leakage, mechanical property changes 
and corrosions. Too high temperature may accelerate aging of the insulation materials 
and can thus significantly shorten the service life of the device. For normal temperature 
and humidity of the device, please check the following table.
Environment Temperature Humidity
Operating 0℃ ~ 40℃ 10% ~ 90%RH Non-condensing
Storage -40℃ ~ 70℃ 5% ~ 90%RH Non-condensing
Clearness
The dust accumulated on the  switch can be  absorbed by static electricity and result 
in  poor  contact of  metal  contact points. Some  measures  have  been  taken  for  the 
device to prevent static  electricity, but  too  strong static electricity can cause deadly 
damage to the electronic elements on the internal circuit board. To avoid the effect of 
static electricity on the operation of the switch, please attach much importance to the 
following items:
Dust the device regularly, and keep the indoor air clean.
 
Keep the device well grounded and ensure static electricity has been transferred.
 
Electromagnetic Interference
Electronic elements including capacitance and inductance on the device can be affected 
by  external  interferences,  such  as  conducted  emission  by  capacitance  coupling, 
inductance coupling, and  impedance  coupling.  To decrease  the interferences, please 
make sure to take the following measures:
Use the power supply that can effectively filter interference from the power grid.
 
Installation