Wiring
General Wiring Procedures
For Ion Chamber
Detectors
Use the following procedure when wiring 9701 and 9702 ion chamber
detectors. You will need a 1/8-inch bladed screwdriver.
Note While wiring the ion chamber detector, locate the Hi-Meg label on
the detector circuit board. A large resistance value will be written on this
label (for example, 4.7 x 1011). Write down this value along with the
detector’s serial number. The Hi-Meg value will be needed during the
gauge setup to fine tune the gauge. ▲
1. Make sure all source shutters are in the “OFF” position.
2. Make sure all power to the gauge is turned off.
3. Remove the housing access cover:
For the 9701 detector, remove the bolts that secure the cover to the
housing.
For the 9702 detector, loosen the screw on the cover retaining
bracket and slide the bracket off of the housing cover. Unscrew the
housing access cover (two lugs are provided on the top of the cover
to aid in the removal of the cover).
4. Remove the foam insulator and the two brass-colored centering plates.
5. As shown in the installation layout drawing 868695, the AC power and
signal wiring should not be run in the same conduit for more than
three meters (ten feet). If required, use a conduit splitter and lay one
conduit for the signal cables and a second conduit for the AC power
wiring.
6. Pull each cable through the conduit and into the enclosure. Leave
approximately 150 mm (six inches) for strain relief. Secure the conduit,
making sure it is completely sealed.
7. Connect the input power, the ion chamber signal wires, and the
temperature compensation board wires, if applicable, as shown in the
installation wiring diagram 868697.
4-4 DensityPRO+ Installation Guide Thermo Fisher Scientific
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