U209-A Electro-Mechanical Totalizer

U209-A Electro-Mechanical Totalizer

Features:

Power: DC12V

Total :7 digits

100% Factory Tested.

Packing:

Weight: Dimension:

200g/case of 1 70×32×42mm/case of 1

ection is small, pump suction is large; vice versa, large returned oil low suction distance. Diagram 2-5: Suction flow of vane pump Suction capacity of pump is restricted not only by its structure but also by the oil physical trait and pipeline. Under a certain temperature, air pocket phenomenon of oil will generated when vacuum reaching a given degree, so that the pump can’t suck oil normally. At high oil level, large resistance from pipeline, much higher vacuum pressure occurs at the inlet of pump; the higher temperature the more likely create air pocket. The phenomenon is likely to appear given the oil is gasoline. The phenomenon of cavitation is generated when partial pressure at inlet of pump is low than air pressure, the dissolved gas in oil begin separate out, and oil start gasifying vigorously as pressure getting down, reaching saturation pressure. The normal working of pump is affected due to a great of foam da fuel dispenser maging the continuity of liquid flow. Fuel dispenser is likely come out any oil or work with large noise as the cavitation is severe. Components will be damaged in this long phenomenon. At same time, oil vibration is increased so that the accuracy become down, as well as shorting service life of hydraulic components. The correlation between liquid saturation and gas pressure is illustrated in diagram 2-6. Diagram 2-6: Relations among temperature, steam pressure and liquid saturation Diagram 2-6 shows gasoline more likely to Air area than water and coal oil under the same pressure along with temperat fuel dispenser ure increasing; under the same temperature the more vacuum pressure the earlier in air-area. There are two aspects that should be considered to prevent cavitation in pump inlet. One is that the design parameter of pump should be rational. The other is that pipeline should be installed scientifically. The effect of hydraulic pipe to fuel dispenser’s suction capacity will be introduced in detail. To understand the principle of cavitation and causation of affecting pump suction capacity is fuel dispenser

dispenser receives a command from the CD (i.e. Open_FP Close_FP Release_FP　　etc.) and the dispenser acknowledges the command positively (i.e. with a MS_ACK=0). The　　dispenser must change to the new state immediately before sending the Acknowledge reply.　　Please see the diagramexample below showing the required steps.　　 (d) Unsolicited　　 Status　　 (a) Open_FP (c) ACK　　Event　　 (b) Process Open_FP　　 Closed Open　　FP_State　　Time　　Where: a = Open_FP command sent by the Control Device.　　 b = Dispenser validates and processed the Open_FP command and decides　　 that the FP can be opened. Dispenser changes its state to Open .　　 c = Dis fuel dispenser penser Replies to the Open_FP command by sending a positive　　 acknowledgement.　　 d = Dispenser generates the unsolicited FP_Status_Message to all devices　　 entered in its Recipient Address table.　　FP31_2.23 IFSF - STANDARD FORECOURT PROTOCOL March 2006　　 DISPENSER APPLICATION　　Page: 134　　5.4 Dispenser Site Controller On-Line Off-Line Handling　　5.4.1 Actions when a Dispenser recognises that a SC is off-line　　The Dispenser recognises that a SC fuel dispenser device that has been entered into its recipient table has　　gone off-line when it does not receive a heartbeat within the duration of 3 times the heartbeat　　interval (normally 3 times 10 seconds = 30 seconds).　　DO:　　 Stop sending unsolicited messages to the off-line SC device.　　DO NOT:　　 If currently fuelling do not stop the transaction. Continue to dispense fuel until the end of　　 the transaction or fuel dispenser

st, independent of capacity, of around $100 for their internal mechanical parts. Flash has no such fixed cost. So at any given point there exists a range of storage capacities where flash, despite being much more expensive per gigabyte, can compete with hard disks on price. Today, flash is competitive for capacities of four gigabytes or less—hence its appearance in the iPod nano, which comes in two-gigabyte and four-gigabyte versions. Above about 20 gigabytes, hard disks win hands down. In between is a battle zone where the two technologies compete. And as the price per gigabyte of both technologies falls, the fight shifts to ever higher capacities. In theory, it is just a matter of time before flash drives become competitive in the 50-100 gigabyte range of today s laptop hard- disk capacities. Yet each new operating system requires more storage capacity than the last. In January Microsoft signalled that laptops fuel dispenser would need around 80 gigabytes of disk storage to run the next version of its Windows operating system, called Vista. To further complicate matters, flash has the disadvantage that its memory cells eventually wear out—though the cells in modern flash chips can typically be reprogrammed around 1m times before this happens. This is not a problem in a devices that stores largely static files that are read but seldom modified (such as music tracks on an iPod). But using flash memory in place of a hard disk to store running software, such as an operating system, is a different matter, since inform fuel dispenser ation is constantly being modified and updated. To get around this drawback, flash-memory controllers keep track of how often particular groups of cells have been modified, and move data to different parts of the chip to maximise its lifespan. And if a fault is detected in a group of cells, that group can be tagged so that it is no longer used. It is worth remembering, however, that hard disks, particularly those in laptops, also have limited lifespans. Although flash seems unlik fuel dispenser