DDZ40(10)(20)-YY/HS/HD
www.dallmeier.com
14
4 Requirements
4.1
General
Unfavourable local conditions may shorten the life of the products and may cause mal-
functions or damages.
Do not install/operate the devices in places
•
with a large amount of dust and dirt,
• with steam or oil vapours (e.g. kitchen),
•
with direct sunlight,
• with strong heat emissions (e.g. radiator),
•
with improper ambient temperatures,
• near sources with strong radiation (e.g. radio transmitters, magnetic fields),
• with corrosive surroundings (e.g. gases, salt water),
• insufficient air ventilation (e.g. closed cabinet).
4.2
Power Supply
The devices can be powered via PoE+ (Power over Ethernet) or supplied with 24/28 V AC
(separate power supply unit required).
Ensure that the existing network supports the PoE standard IEEE 802.3at if you want
to power the devices via Power over Ethernet.
Note that the built-in fan and heater of the weather-proof housing must be separately sup-
plied with an additional power supply unit (24 V AC, max. 3 A).
4.3
outdoor
For outdoor installations, always use the respective weather-proof variant.
However, note that direct sunlight can cause very high temperatures inside the housing.
In this case, use the corresponding sunshield.
4.4
operation
Observe the following notes for the operation of the devices:
•
If the devices or the cables connected to the devices are located near sources with
strong radiation, the video image may be distorted.
• The devices are equipped with an automatic gain control (AGC). In low light condi
-
tions the image may be altered (e.g. noise). However, this is not a malfunction.
•
The quality of the video image depends on the lighting conditions and the used moni-
tor.
• The accuracy of the automatic white balance (AWB) algorithm depends on the light
-
ing used. Mixed light (consisting of artificial light and daylight) may cause colour
distortions (inaccurate colour reproduction).
•
Poor lighting can lead to a faulty white balance.
