Functions (Cooling) - 5
Version 1.36
02/2004
40/104
Temperature sensor (temperature in °C/°F)
Temperature sensor (resistance in Ohm)
-10 / 14
-6 / 21.2
0 / 32
5 / 41
10 / 50
15 / 59
20 / 68
25 / 77
30 / 86
35 / 95
27667
21156
16322
12690
9946
7851
6243
4998
4027
3265
Normal
resistance (Ohm)
Normal
temperature (°C/
°F)
50/122
30/86
20/68
10/50
0/32
-10/14
0
5000
10000
15000
20000
25000
30000
Resistance measurement
2.
Functional description
General
The cooling system is designed to maintain a constant temperature of 2~5 °C/ 35.6~41°F inside the cooling
compartment. The machine features a thermo-electric cooling system. The low temperature is generated by
a Peltier element that is actuated between 3.5/38.3°F and 4,5 °C/40.1°F
The peltier element is basically a series of thermo-electric cooling cells consisting of 2 bismuth semi-
conductive bridges. The bridges are made of tellurium with different surface layers. An electric current is
applied to create the heat transfer.
A sealing is applied to the contact surfaces of the peltier element to prevent that the condensated water
would cause corrosion.
The heat from the interior of the cooling compartment is transferred by the peltier element onto an
alluminium heat sink and removed by a cooling fan. The fan remains on in the stand-by mode.
Temperature control
The temperature inside the cooling compartment is detected by an NTC sensor. The resistance in the
sensor reduces when the temperature rises and vice versa. The resistance generated by the sensor is
constantly measured and used for the on/off control of the peltier element current. The effective input range
is ±17000 ~ 9000 Ohm (1°C~12 °C/33.8~53.6°F)
Содержание Cafitesse 50
Страница 4: ...Version 1 36 02 2004 ...
Страница 20: ...Version 1 36 02 2004 ...
Страница 30: ...Version 1 36 02 2004 ...
Страница 38: ...Programming 8 Version 1 36 02 2004 4 3 Programming flow chart service device ...
Страница 56: ...Version 1 36 02 2004 ...
Страница 64: ...Version 1 36 02 2004 ...
Страница 78: ...Version 1 36 02 2004 ...
Страница 80: ......
Страница 94: ...Version 1 36 02 2004 ...
Страница 95: ...Version 1 36 02 2004 6 Preventive Maintenance Contents 02 2004 Not available ...
Страница 96: ...Version 1 36 02 2004 ...
Страница 102: ...Version 1 36 02 2004 ...
Страница 103: ...Version 1 36 02 2004 8 Service Information Bulletins Contents 02 2004 Not available ...
Страница 104: ...Version 1 36 02 2004 ...
Страница 105: ...Version 1 36 02 2004 9 Modification Instructions Contents 02 2004 Not available ...
Страница 106: ...Version 1 36 02 2004 ...