VICI D-2-IM - Manual (Page 15)

11
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 inter-
connectons. 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 tube extending into the oven. The 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.
Horizontal Mounting
Some older GCs have access to the column oven through the side of the GC. This
does not present a problem as far as operation of the PDD is concerned. Drill a
hole at the appropriate location, orient the detector for convenient connection, and
mark the position of the mounting holes. Drill the mounting holes and secure the
detector to the side of the GC with four sheet metal screws (not supplied).