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...5 ELECTRICAL INSTALLATION
Caution. The integrity of the fail-safe operation of
the zener barrier units depends on a Safety Earth
connection which must not have a resistance greater than
1R0 to the application plant earth (ground).
Make the Earth (Ground) and Safety Earth connection at the
stud (TS1) – see Fig. 5.1.
On completion of wiring and checks, replace the outer case
and secure the clamping brackets to the mounting panel.
Measuring
unit
Tubing
connections
Inlet
Fig. 5.2 Location of Components Inside Case – Model 6548 001 Katharometer Unit
12
5.1.2
Electrical connections are made inside the katharometer unit
(6548 001) on the analyzer panel – see Fig. 5.2.
Remove the cover of the katharometer unit to gain access to
the terminal block (TB1) inside.
Make the electrical connections to the Gas Monitor in
accordance with the information given in wiring diagram Fig.
5.3 and Section 5.2.
The electrical connections are made at the terminal block
(TB1) via the cable gland, or any replacement gland to suit the
intrinsically safe wiring requirements. When the appropriate
interconnections have been made, if remote zero is to be used,
remove the 510R dummy load resistor from across terminals 9
and 10 and set the zero adjustment on the katharometer to the
approximate mid-point.
Replace the cover on completion of wiring up.
Zero adjustment
Terminal block (TB1)
Mounting pillars
Model 6548 000 Katharometer Analyser Panel
10
9
10
Dummy
load
resistor
9
Outlet
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