7
3.2 Operating sequence
At the start of the transaction, the dispenser displays the previous sale. The attendant removes
the nozzle corresponding to the grade required on the side of the dispenser at which he is
standing. The displays show all 8s, blanks then zero. The grade selected and corresponding
unit price is displayed and the appropriate motor is started permitting a delivery to commence.
A second nozzle may be used on the other side of the dispensing unit. At the end of the
delivery the nozzle is replaced in the nozzle holster and the pump motor stops.
3.3 Interlocks and security features The following interlocks are provided:-
(i) Only one grade can be selected at any one time and cannot be changed after a delivery
of 0.05 litres has occurred.
(ii) The delivery is stopped if the pump detects an error condition.
In the event of a mains power failure, displays on the dispenser are maintained.
(iv) A period of 5 seconds must elapse before a delivery of fuel can be authorised following
the replacement of the nozzle in the previous transaction.
(v) The unit price cannot be changed after any operation has been made on the dispenser to
initiate a transaction and before the expiry of the 5 second guard time (as iv).
The remote control cannot access the programming mode unless the key switch has been
operated and a PIN code is entered via the remote control, Access to the programming mode is
not possible during a transaction.
(vii) It is not possible to enter a unit price below 32.4 pence per litre.
4 AUTHORISED ALTERNATIVES
4.1 Alternative Enclosure Arrangements
4.1.1 Having the dispensing unit, described in the certificate, with one, up to a
maximum of ten, hose(s) and associated nozzle(s). The hose arrangement may be with an equal
or unequal number of hoses on each side.
4.1.2 Having nozzles and displays fitted to one side of the dispenser only, in which
case the appropriate meters, encoders and valves are removed from the unit and that side of the
display case is blanked.
4.1.3 Having a single-product, single-hose high speed version. where the Tatsuno
hydraulic unit described at Section 2.2 feeds one meter only. The hydraulic unit is contained
within the master module.
4.1.4 Having a single-product two-hose high speed version, where the Tatsuno
hydraulic unit described at Section 2.2 feeds one meter only. The master module contains one
hydraulic unit and the hose assembly. The other hydraulic unit is contained within a slave
module which has no hose assembly
(98 pages)
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