Bruker BVTE3900, Техническое руководство

Страница: 16 / 41

16 (41) BRUKER Technical Manual Version 003
Description
•
Switch on the BVTE3900.
•
Start VTU sample temperature regulation.
•
In low temperature operation, the purpose of the vacuum pump is to avoid the
sample tube from being lifted by the N2 gas flow. Adjust vacuum pump to
500
l/h (flowmeter ball at 1/3 of full scale).
Probe dismounting 2.9
•
Turn off the power line switch to stop the pump.
•
Turn the switch on position «purge». Wait 3-5 minutes, during that the time the
purge of the probe head is carried out. See section "Drain the tank" on page
15.
•
Remove the connectors and hoses.
Safeties 2.10
The following safeties prevent probe overheating when working at high tempera-
ture. In case of fault a relay opens the signal path of the heater safety thermocou-
plel.
1. The right water level in the tank is indicated when the green led on front side
lights. A low level in the tank disables the pump.
2. A water flow sensor monitors the water flow. When the flow is too low or miss-
ing it switches off the heater.
3. A Pt100 sensor measures the temperature inside the probe. When the temper-
ature exceeds a threshold (320 K) it switches off the heater.
4. The safety thermocouple located on heater measures the temperature of the
heater resistor. Missing gas flow while heating will produce an overheating that
switches off the heater.
If a fault occurs and switches down the heater, check the system (water level, gas
flow etc.) and restart the heater.