| 摘要 |
A delivery vehicle is used to deliver oil with or without a marker and is provided with apparatus which includes a reservoir of marker and an injector pump for adding marker to the oil. A controller records the occurrence of an event associated with the depletion of the reservoir which has an upper section, a lower section and a marker level sensor located at a narrow constriction between the two sections. The apparatus includes a blender 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 is arranged to provide a delay prior to each forward or reverse stroke. The memory devices of the controller are locked or sealed so as to deny access to reprogram the controller.
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