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2.12 Cable Glands
Two cable glands can be connected to the enclosure base of the Master unit: 1 M25 and 1 M20 cable gland. For the
standard configuration see chapter 5 "Hardware installation".
Most installations will use one for data communication cable (TCP-IP and/or Serial ModBus) and another for Power
Supply (24 VDC). Additionally also signal cables (such as alarm contacts, carrier gas control, etc) might be used as long
as they are combined in the same cable.
fig. 2-17 Location of Cable Glands at the right of the Enclosure Base
Cable glands with a sealing system are typically required. Installation directive EN 60079-14 recommends for Ex-d
devices with an internal volume > 2 dm3 the so-called "Barrier Glands", incorporating compound filled seals around the
individual cores or other equivalent sealing arrangements. The cable glands and blind covers of unused openings must
be installed correctly and non-flammable.
2.13 External Switch
To comply with Electrical Safety Standards IEC 60947-1 and IEC 60947-3, an external switch has to be located close to
the analyser, enabling an operator to close down the unit in case of emergency. It has to be marked with "Disconnecting
Device". Practical implementation of this requirement will differ from site to site. In any case the external switch
installation has to comply with all national, local, and company codes applicable to the location.
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EnCal 3000 Quad– Hardware Manual
16/09/2014
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