How The Electronics Work - Agilent Technologies 1100 Series Reference Manual

Figure 23
Theory of Operation

How the Electronics Work

How the Electronics Work
The vacuum degasser has two different normal operation modes and a
continuous mode. In operation mode 1 the vacuum degasser works around a
defined set point (115 Torr). Due to environmental conditions it is possible
that the vacuum degasser cannot reach the pre-defined set point. Under this
condition the operation mode 2 becomes active and the vacuum pump is
activated in defined time intervals (vacuum level 115 to 190 Torr). In case of a
malfunction of the vacuum degasser (vacuum level above 190 Torr) the
instrument is turned into the error mode.
Operation Modes of the Vacuum Degasser
Pressure
Ambient
190 Torr
115 Torr
Operation Mode 1
The main function of the vacuum degasser control assembly is to control the
vacuum pump and to check the vacuum in the vacuum container.
The power section of the control assembly comprises a switching power
supply that generates + 24 V from line voltage. The + 24 V is used to drive the
vacuum pump and the solenoid valve. The electronic control circuit uses
+ 12 V which is generated from the + 24 V.
74
Error Limit
8 min
Operation Mode 2
8 min
time