Care and maintenance
56
Edition 01/2014
contrAA 600
Fuse number
Type
Protected circuit
F7
T 3.15 A
Xenon lamp
F8
T 3.15 A
Xenon lamp
Furnace fuse (see Fig. 20)
Type
Protected circuit
TR5-T 100 mA
Graphite tube furnace
Table 7
Fuses
CAUTION! ELECTRIC SHOCK!
The power supply fuses F1, F2 may only be changed by service engineers from Analytik
Jena AG or by technical personnel authorized by Analytik Jena AG.
7.2.2
Reactivating the safety circuits of the cooling water circuit
The temperature of the cooling water circuit is monitored by means of two safety circuits.
Protection of the xenon lamp from overheating
The first safety circuit automatically deactivates the xenon lamp if the cooling water tempera-
ture exceeds 60°C. When the cooling water temperature is below the limit value again, the
lamp is switched on when the contrAA 600 is reactivated and initialized.
Protection from uncontrolled furnace heating
A second safety circuit protects the AAS in the event of a possible communication error
between control (PC) and spectrometer from uncontrolled heating of the furnace. In the
event of a failure, this safety circuit switches off the power supply of the device hardware if
the cooling water temperature exceeds 65°C. Damage to the device that would be caused if
the furnace is still heating can be avoided. If the second safety circuit has switched off the
power supply, the error message "Timeout autosampler" appears when the contrAA 600 with
graphite tube technique is reactivated.
The second safety circuit can be reactivated manually:
1.
Open the right front door of the lamp chamber.
2.
Operate the small red switch on the back of the lamp chamber (arrow in Fig. 34).
3.
Switch the contrAA 600 back on and start the software ASpect CS.
If the lamp ignites and no error message appears, the device is ready.
