Installation
26
MP150
5.9
Water Cooling
The linescanner is equipped with integrated stainless-steel pipes for water cooling. These pipes are
embedded in the cast aluminum housing. The water cooling system enables the linescanner to be
installed in ambient temperatures up to 180°C (356°F). Maximum pressure for the cooling fluid is
15 bar (218 PSI). Only filtered water should be used in order to reduce the risk of clogging at the hose
couplings. In order to prevent the accumulation of water condensation on the scanner window and to
protect the window, the air purge system should always be used when water cooling is used.
Threaded tube fittings to connect a water cooling system are provided as accessory, see section
7.4
, page 37. The internal stainless steel tube is designed to mate to a hose with an
internal diameter of 6 mm (0.24 in.).
The following table gives some examples for the efficiency of the water cooling system.
Ambient Temperature
Water Flow
Water Temperature at Inlet Resulting Internal Temperature
180°C (356°F)
1 l / min (0.26 gallons / min)
25°C (77°F)
36°C (96.8°F)
180°C (356°F)
2 l / min (0.52 gallons / min)
15°C (59°F)
27°C (80.6°F)
Tab. 2: Efficiency of the water cooling system
5.9.1
Avoiding Condensation
If environmental conditions make water cooling necessary, it is strongly recommended to check for
condensation on the interior of the scanner housing.
Water cooling also cools the air in the interior of the scanner housing thereby decreasing the capability
of the air to store water. The relative humidity increases and can reach 100% very quickly. In case of
additional cooling, the surplus water vapor will precipitate out as water (condensation) that will
condense on the lenses and the electronics thereby causing device failure. Condensation can even
occur with an IP65 sealed housing.
The presence of condensed water inside the housing will void the warranty!
There are several ways to prevent condensation:
1.
Adjust the flow rate and check visually for moisture on the exterior of the housing. This method
has a degree of risk if the moisture is not detected quickly.
2.
Use a radiator or heat exchanger where the cooling fluid can be heated above the dew point.
3.
Measure the ambient temperature and the relative humidity where the device has to be
installed. Use the table below to get the
minimum
device temperature. If the temperature of the
cooling fluid is much lower than the minimum device temperature, condensation can be
expected. To avoid this, adjust the flow rate manually or use a thermostat to keep the device at
a minimum temperature above the dew point.
The use of a thermostat is strongly recommended, see section 7.5
