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...6 INSTALLATION
6.5 Electrical Connections
Warnings.
• The transmitter is not fitted with a switch therefore a disconnecting device such as a switch or circuit breaker conforming
to local safety standards must be fitted to the final installation. It must be fitted in close proximity to the transmitter within
easy reach of the operator and must be marked clearly as the disconnection device for the transmitter.
• Remove all power from supply, relay and any powered control circuits and high common mode voltages before accessing
or making any connections.
• The power supply earth (ground) cable must be connected to the earth (ground) stud nearest to the cable's entry point
in the transmitter case (see Fig. 6.10) to ensure safety to personnel, reduce the effects of RFI interference and ensure
correct operation of the power supply interference filter.
• Use cable appropriate for the load currents. The terminals accept cables up to 14AWG (2.5mm
• The monitor conforms to Mains Power Input Insulation Category III. All other inputs and outputs conform to Category II.
• All connections to secondary circuits must have basic insulation.
• After installation, there must be no access to live parts e.g. terminals.
• Terminals for external circuits are for use only with equipment with no accessible live parts.
• The relay contacts are voltage-free and must be appropriately connected in series with the power supply and the alarm/
control device which they are to actuate. Ensure that the contact rating is not exceeded. Refer also to Section 6.5.1 for
relay contact protection details when the relays are to be used for switching loads.
• Do not exceed the maximum load specification for the selected analog output range.
The analog output is isolated, therefore the –ve terminal must be connected to earth (ground) if connecting to the isolated
input of another device.
• If the monitor is used in a manner not specified by the Company, the protection provided by the equipment may be
impaired.
• All equipment connected to the transmitter's terminals must comply with local safety standards (IEC 60950, EN601010-1).
Notes.
• Four earth (ground) – studs are fitted to the transmitter case for bus-bar earth (ground) connection – see Fig. 6.10.
• Always route sensor signal cables and mains-carrying/relay cables separately, ideally in earthed (grounded) metal conduit.
• The screens of the sensor's emitter, receiver and cleaner cables must be enclosed in yellow/green sleeving and
connected to the earth (ground) stud fitted to the transmitter case closest to the cable's entry point – see Fig. 6.10.
• Ensure that cables enter the transmitter through the glands nearest the appropriate screw terminals and are short and
direct. Do not tuck excess cable into the terminal compartment.
• Ensure that the NEMA4X/IP66 rating is not compromised when using cable glands, conduit fittings and blanking plugs/
bungs (M20 holes). The M20 glands accept cable of between 5 and 9mm (0.2 and 0.35 in.) diameter.
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