| 摘要 |
A delivery vehicle is used to deliver oil with or without a marker and is provided with apparatus which includes a reservoir (7) of marker and an injector pump (10) for adding marker to the oil. A controller (13) records the occurrence of an event associated with the depletion of the reservoir (7) which has an upper section (15), a lower section (17) and a marker level sensor (8) located at a narrow constriction between the two sections (15, 17). The apparatus includes a blender (21) which causes fluid flow to occur at different rates and is operable so that the slugging effect of marker injection is reduced. The injector pump (10) is arranged to provide a delay prior to each forward or reverse stroke. The memory devices of the controller (13) are locked or sealed so as to deny access to reprogramme the controller (13).
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