Also see drawing 2110C8049 Outline Dimensions of Certied Transmitter, Sensor &
Accessories (available on request from Honeywell Analytics).
General Installation Guidelines
The following general points should be noted before any installation is carried out.
• Read all the instructions before starting any of the installation procedures.
• Identify a suitable location with a at surface where the Apex Transmitter Unit/
Certied Junction Box can be mounted.
• Identify external cable requirements and the necessary cable/conduit entry
ports to be used on the Apex Transmitter Unit/Certied Junction Box.
• The Certied Sensor must always point downwards to avoid collection of uids
and other materials on the face.
• When tting components that are certied also refer to the Control Drawings
(see Appendix B).
ThesystemcomponentscomplywiththeEMCrequirementsofEN50270.Inordertomaintain
compliance with this standard it is essential that the components are installed correctly as detailed
below. It is the responsibility of the installation design authority to ensure that the electrical
installation meets appropriate standards.
1. The unit should not be electrically connected to electrically noisy (dirty) metalwork or
conductors. The case should be connected to a low noise (clean) earth line via the screen on
theeldcabling.
2. Theentirelengthoftheeldcablingconnectedtoeachunitshouldbefullyscreenedwiththe
screen connected to a low noise earth.
3. The low noise earth line should only be connected to safety earth at a single point. Star
earthing arrangements minimise earth current crosstalk. Field cabling shields should not be
connected such that earth loops are produced.
4. The earth bonding arrangement must ensure that the maximum peak voltage between the
unitcaseearthandanyeldcableconductorislessthan350V.Voltagesinexcessofthiscan
causepermanentdamagetotheunit'sRFIprotectionlters.
5. The use of a single, screening cable for each gas detector ensures maximum screening
and minimum crosstalk. Cabling arrangements which use a single cable for connecting
elddevicescompromisescreening,increasethepotentialforcrosstalkandprevent
implementation of true star earthing.
3. INSTALLATION