User`s guide

Installation and Setup
41
Although the SMPSU incorporates thermistors, to limit the “inrush”
current these are only effective when they are close to room
temperature. During normal operation these components run at an
elevated temperature and, as a result of their reduced electrical
resistance, are unable to prevent the passage of high surge currents
associated with brief interruptions of the external supply.
To avoid nuisance tripping of excess-current protection devices, do
not supply power to the ATD/TD through fast acting circuit breakers.
In addition, it is recommended that when you switch off the power to
reset the ATD/TD, wait at least 30 seconds before restoring the
power. This enables the thermistors to recover.
This information refers only to excess-current protection devices.
Any tripping of devices that detect current running to ground, for
example earth leakage circuit breakers (ELCBs), residual current
devices (RCDs), etc., is due to a different mechanism. Such
occurrences must be investigated by a qualified person with
expertise in electronics.
Connecting the ATD or TD to a Gas
Chromatograph
Connecting the ATD/TD to a gas chromatograph involves the
following procedures:
1. Connecting the gas supplies to the ATD/TD.
2. Making the electrical connections.
3. Installing the heated transfer line.
4. Connecting optional accessories.
5. Leak testing the system.
6. Performing a test run to ensure all system components
are operational.
The ATD/TD–Gas Chromatograph configuration may vary slightly
depending on the type of GC that you are using and on your
application.
In some GC systems, the heated transfer line cannot be connected to
the GC oven through the back of the GC. In this case, an empty