Maintenance Procedures - General Quantium 310 Maintenance Manual
Page 2-2 Document Ref 941113-001 Rev 2
2 MAINTENANCE PROCEDURES - GENERAL
2.1 General
For part identification, please consult the Parts Manual.
Always follow the safety checklist as detailed in Section 1.5.
Before starting any maintenance procedure:-
•Ensure that all necessary tools and replacement parts are available.
•Ensure the dispenser is isolated and all power is turned off.
•When working on or near a dispenser, always act in accordance with general safety rules
and regulations.
•Cordon off the dispenser under repair.
•Wear appropriate Personal Protective Clothing as recommended in Section 1.5.5.
2.2 Important Safety Information relating to IS Circuits
The Quantium T range of dispensers includes Intrinsically Safe (IS) circuits. The
intrinsically safe cables are normally identified by blue coloured cables or cables marked
at both ends with blue sleeving. IS circuits connect to nozzle switches, preset push buttons
and to the Vapour Flow Meter (where fitted).
Cables for the IS circuits require careful routing and must remain segregated from all
other cabling, both in the hydraulic and electronic areas of the dispenser. During
maintenance or service procedures, ensure that the routing of the IS cables is unaltered
and that the IS cables do not share cable glands and are not tied to any other non-IS cables.
In order for a circuit to remain intrinsically safe, there is a limit to the number of devices
which can be simultaneously connected to it. For example, the nozzle bus also connects
to preset button sensors and various hall effect sensors. The maximum number of devices
is dependent upon both the electronic characteristics of the individual device and the
length of cable used for the connection. No modifications should be made to the dispenser
IS circuits unless under direct instruction or by the use of specific Tokheim retrofit kits.
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