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...4 MECHANICAL INSTALLATION
4.2 Sample Gas Interconnections
Note. A hazardous mixture of hydrogen in air could develop in the event of leakage from the sample gas system. Mount
katharometer analyzer panels in a ventilated area.
The sample pressure must not exceed 0.35 bar (Gauge) for Model 6540 203 or 10 bar (Gauge) for Model 6548 000.
The incoming sample gas temperature must not exceed 55°C (131°F). Ideally the sample gas temperature should be allowed to reach
ambient temperature before entry to the Katharometer unit.
If there is a risk of significant particle contamination incorporate a suitable 1µm filter unit in the system before the sample gas enters
the analyzer system.
Compression couplings are supplied at the sample inlet and outlet to the katharometer panel. These couplings are suitable for
connecting 8mm (0.31 in.) (Model 006540 203) or 6mm (0.24 in.) (Model 006548 000) outside diameter metal tube. It is
recommended that stainless steel tube is used.
The complete tubing system should be tested for leaks in accordance with the requirements of the responsible authority.
Power Supply
Unit 1
Barriers
Terminal Block
Note. The number of terminals, cable glands, low-flow alarms, PSU's and zener barriers
12
Earth Point (Ground)
To Cubicle Earth
1 2 1 2
POWER
SUPPLY
UNIT No 1
3 4 3 4
No. 1 No. 2
BARRIER FLOW
ALARM
1
2
3
4
5
6
14 15 16 17 18
7
8
9
10 11
12 13
KATHAROMETER
LOW FLOW
TERMINAL BLOCK
ALARMS
Cable Glands for Cable
Terminations in
Hazardous Areas
(flow alarms) vary according to ordering information details specified.
Fig. 4.5 Location of Main Components on Cubicle Backplate
Low Flow Alarm
Relay 1 (if fitted)
E SCR S1 S2
0V 0V -12V+12V
CH 1
I
N COM NC NO
Relay No. 1
E SCR S1 S2
0V 0V -12V+12V
CH 1
I
N COM NC NO
POWER
SUPPLY
UNIT No 2
Relay No. 2
19 20 21 22 23 24
1
2
3
4
5
6
7
8
9
10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
ALARMS AND
RETRANS
Cable Glands for
Cable Terminations
in Safe Areas
Power Supply
Unit 2 (if fitted)
Low Flow Alarm
Relay 2 (if fitted)
L
N
E
L
N
E
MAINS
TERMINAL
BLOCK
Mains Power
Cable Glands
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