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...5 ELECTRICAL INSTALLATION
Warning.
•
Equipment in this system operates on a.c. mains supply
voltage electricity. Suitable safety precautions must be
taken to avoid the possibility of electric shock.
•
Although certain instruments are fitted with internal fuse
protection, a suitably rated external protection device,
either a 3 A fuse or miniature circuit breaker (m.c.b.),
must also be fitted by the installer.
•
The proper electrical connections and wiring standards
must be achieved to establish the intrinsic safety of the
system, as certified.
•
A.C input, intrinsically safe d.c. output and non-
intrinsically safe wiring must all be routed separately.
Fig. 5.1 shows the interconnecting wiring requirements for the
gas analyser system, which must be strictly observed. Details of
cable requirements, which must be strictly adhered to, are also
given – see Section 5.2.1.
After completing the wiring, check that the continuity earthing
(grounding) and isolation of all circuits is to the required local
electrical standards for intrinsically safe circuits.
The separate units of the analyser system must be
interconnected as shown in Sections 5.1.1, 5.1.2 and 5.1.3.
Clamp
Cam
Range Switch
Mains Power
Supply Fuse
Safety Earth
Terminal (TS1)
3-way Mains
Supply Terminal
Block
Fig. 5.2 Location of Components Inside Case – Model 6553 Gas Monitor
14
TB3
1
L
N
E
TB4
TB1
Terminal Blocks for
Power and Signal
Conventional Circuits
5.1.1 Model 6553 Gas Monitor – Fig. 5.2
Warning. No connections must be made to the
hazardous area terminals (Terminal Blocks TB5 & TB6) other
than as specified in wiring diagram Fig. 5.3. The appropriate
cable requirements must be also satisfied.
Remove the outer case from the back of the unit to gain access
to the terminal blocks.
The electrical connections are made through the bottom of the
unit into the terminal blocks immediately above them.
See Fig. 5.2.
The alarm and signal outputs on terminal blocks TB3 & TB4, may
be connected as required. The availability of signal outputs vary
with the particular 6553 system. Refer to Fig. 5.3 for details.
Make the wiring connections in accordance with the information
given in the wiring diagram Fig. 5.3 and Section 5.1.
See Fig. 5.4 for connections to cubicle-mounted monitor.
B1 B2 B3
TB5 TB6
16
Terminal Block (TB5 & TB6)
for Katharometer Zero Pots.
Intrinsically Safe Circuits
Type : 4689
Upper Display
Unit
Zero Adjustment
for Remote
Katharometers
Type : 4689
Lower Display
Unit
Zener Diode
Safety Barrier
Devices
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