VICI D-2-I - Manual (Page 17)

13
Installation
The detector is usually mounted on top of the GC column oven. The cabling
as supplied requires the discharge module to be located within 0.6 m (2')
of the detector and the controller to be within 1 m (3.5') of the detector and
discharge module. The power cord for the controller is 1.8 m (6') long, and
the signal output cables (attenuated and unattenuated) are 1.2 m (4') long.
General Precautions
• Do not use plastic/polymer or copper tubes for gas handling and
interconnectons. Use only stainless steel tubing with Valco gold-plated
ferrules.
• Do not turn the unit on until the helium discharge gas is flowing through
the detector.
• Do not shut off or disconnect the discharge gas when the detector is hot,
even if the unit is turned off. Turn off both power switches (front and back
of the controller) and allow the detector to cool down naturally before
disconnecting or shutting off the discharge gas.
• Do not cover the unit with materials or devices which would restrict air
circulation.
• Position the controller unit where the mains switch on the rear panel can
be reached easily.
Mounting the Detector on the GC
Vertical Mounting
Most GCs have an existing opening which
will allow the PDD to sit vertically on top
of the column oven with the column inlet
manifold (PD-D2, top) or tube (PD-D2-IS,
bottom) extending into the oven. (The
PD-D2-IS vent tube can either extend into
the oven or be carefully bent near the base
to remain outside the oven.) If you are
replacing an existing detector, you can
usually just remove it and set the PDD in
its place. If not, use a drill or chassis punch
to drill a hole of the proper size, and set the
detector in position.
While trying to match the mounting holes of
the base plate to every GC on the market is
impractical, we have located the mounting
holes so that at least two of them will coincide
with existing holes on the GC. If you had to
drill a new hole to mount the PDD, you will
have to drill new mounting holes as well.
Orient the detector to allow for easy cable
and gas connections.
DOPANT VENT
DISCHARGE
GAS INLET
DISCHARGE
GAS INLET
VENT
VENT
TUBE
DOPANT GAS INLET
(ECD MODE)
COLUMN
INLET NUT
COLUMN
INLET
TUBE
COLUMN
INLET
MANIFOLD
PD-D2
PD-D2-IS