Technical Manual Page 8 CODEL
OPS.080 Issue : C Rev. : Date : 16/7/08 Doc. i/d : 0080/6 Ref. : 080040
The transceiver, GCU and SCU, are supplied with blanking plugs fitted in the cable gland entry holes. Cable
Glands are packed separately.
Some contracts require the mounting of all power supply, processing and control units in
instrumentation panels. In such cases please refer to the additional system schematics
supplied. These are always contract-specific.
Although transceivers and GCUs are essentially interchangeable, analysers are configured and tested as
complete systems in the factory. If more than one analyser is received, ensure that all units are matched.
3.1.2. Transceiver Weather Cover
Model 4000 analysers are suitable for outdoor installation in ambient temperatures ranging from -20°C to +50°C.
However, it is good practice to install units in positions where they have maximum protection. Whilst this is
usually possible for the GCU and CDC, options may be limited for the transceiver. To protect generally against
exceptional weather conditions, even in temperate climates, and particularly to facilitate servicing under these
conditions, a weather cover is fitted to maintain a stable air temperature around the sensor head.
Figure 4 : Active Weather Cover
3.2. Additional Materials
The installation of a 4000 Series analyser will require a number of materials in addition to those supplied with
the analyser. The following are intended to cover most possibilities, but not all listed materials will be required
for all installations. See also Figure 5.
• Cables
Unit Function
No. of
Cores
Core Specification/Cross Sectional Area
O/D
min/max
Screened
YES/NO
CDC (if
required)
Serial
Comms.
4
Multi-strand 16/0.2mm, 0.5mm
2
min.
5mm/12.8mm
YES
Normalising
inputs
2
Multi-strand 16/0.2mm, 0.5mm
2
min.
5mm/12.8mm
YES
Analogue
outputs
2
Multi-strand 16/0.2mm, 0.5mm
2
min.
5mm/12.8mm
YES
Gas
Control
Unit
Fault alarm 2
Multi-strand 16/0.2mm, 0.5mm
2
min.
5mm/12.8mm
YES
Note that screened cables should have the screen terminated as described in Section 4.
Installation. If steel wire armoured cable is used the steel wire sheath should be earthed at the
analyser end only.
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