VICI D-4-I-VA38-R - Manual (Page 10)

6
DETECTOR MOUNTING BASE
HEATER
CABLE
MOUNTING BASE
SCREWS (4)
HEATER BLOCK
SCREWS (2)
TEMPERATURE
PROBE
HEATER BLOCK
Installation
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 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 the discharge power switch and
allow the detector to cool down naturally before disconnecting or shutting
off the discharge gas.
• Do not cover the unit with anything which could 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
1. Remove the heater block from the detector by loosening the clamping
screw.
2. Remove the detector mounting base (Varian #03-925326-01) from the GC
by removing the four mounting base screws (Varian #12-901163-00).
3. Using the two 8-32 x 1" screws provided, install the heater block on the
underside of the detector mounting base. Be sure to orient it so that the
cut-out slot on the top of the heater block will be facing the rear of the GC.
4. Insert the detector into the heater block with the bias, electrometer, and
high voltage connectors facing the rear of the GC. Tighten the clamping
screw in the heater block to secure the detector.
5. Insert the heater (Varian #03-925396-01, -02, or -03) and temperature
probe (Varian #03-925374-01) into the detector’s heater block.
6. Using the four mounting screws, install the detector mounting base with
heater block/detector assembly on the GC.
Figure 3: Mounting the detector on the GC