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    re approval working successfully being conducted. Environmental temperature as approval should keep in the range of �0�to �0� in approval process temperature not exceed 3� relative temperature between 30�and 90� power supply within �0% to �5%; and frequency ±1Hz. The mediums used in approval should adapt real media excepting in factory approval. As different medium would be adaptable to fuel dispenser, every medium should be appraised. Some of them a fuel dispenser re prohibited, especially water. The highest temperature of medium in approval should not exceed 30� the lowest temperature without coagulation. The temperature difference between the one at the outlet of fuel dispenser and the temperature measured in standard instrument should not exceed 4� Otherwise, the approval is invalid. Standard instrument used in approval whose measuring accuracy no lower than one fifth of the allowed tolerance of fuel dispenser, should pass over appraisal of the Measurement Department and be valid within period. There are many standard instruments being adaptable to fuel dispenser’s approval, however, the most popular one is standard metal instrument of measurement. Standard metal instrument of measurement adapted in approval should, in accordance with the requirement of fuel dispenser’s regulations and procedure, be Class II standard metal instrument of measurement with cubage no less than one minute’s discharge volume of fuel dispenser, approval period being 3 years. Standard metal instrument of measurement often is made of stainless steel or carbonized steel with protecting painting, no air vent, erosion-resistant and smooth surface. Its structure is shown in Diagram 8-1. 1: Overflow cover 2: Metering neck 3: Body 4: Bracket 5: Adjusting bolt 6: Drain valve 7: Leveling instrument 8: Scale Diagram 6-1: Sketch map of metal standard instrument of measurement Standard instrument of measurement is composed of overflow fuel dispenser cov fuel dispenser er, body, measuring neck, scale, valve, which should meet the follo

technical specification

     composite) xs:documentation   xs:annotation   xs:restriction base=xs:string   xs:enumeration value=CashierDisplay   xs:enumeration value=CustomerDisplay   xs:enumeration value=Printer   xs:enumeration value=ICCrw   xs:enumeration value=CardReader   xs:enumeration value=P fuel dispenser inEntryDeviceCardReader   xs:enumeration value=PinPad   xs:enumeration value=PEDReaderPrinter   xs:enumeration value=MSR   xs:enumeration value=RFID   xs:enumeration value=BarcodeScanner   xs:enumeration value=CashierKeyboard   xs:enumeration value=CashierTerminal   xs:restriction   xs:simpleType   xs:simpleType name=CardRequestType   xs:annotation   xs:documentation IFSF POSEPS interface - Card Request  messages xs:documentation   xs:annotation   xs:restriction base=xs:string   xs:enumeration value=CardPayment   xs:enumeration value=CardSwipe   xs:enumeration value=LoyaltySwipe   xs:enumeration value=CardPaymentLoyaltyAward   xs:enumeration value=LoyaltyAward   xs:enumeration value=CardPreAuthorisation   xs:enumeration value=CardFinancialAdvice   xs:enumeration value=CardPreAuthorisationLoyaltySwipe   xs:enumeration value=CardFinancialAdviceLoyaltyAward   xs:enumeration value=LoyaltyRedemption   fuel dispenser fuel dispenser xs:enumeration v

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    itting light when zapped with electricity dates back to 1907. But because the amount of light produced was tiny, no one pursued the idea in earnest. That changed in the early 1960s, when Nick Holonyak, a researcher at General Electric, first learned that semiconductors could generate infra-red light. He then set out to make a new type of semiconductor crystal that would be able to emit visible, red light. He succeeded in 1962, inventing the first practical fuel dispenser light-emitting diode. An LED is based on a combination of two semiconductor materials, called n-type and p-type. The n-type is so called because it contains an excess of negatively charged electrons; the p-type contains an abundance of positively charged “holes�that can accept electrons. At the junction where the two materials meet, electrons pair up with holes to form an area depleted of charge that prevents current from flowing. But applying a large enough voltage causes electrons and holes to flow into the junction from opposite sides. As electrons and holes pair up, each electron gives up energy, which is emitted in the form of light. By changing the composition of the semiconductor materials, it is possible to determine the amount of energy given up by each electron, and hence the light s colour. Even though Dr Holonyak s original red LEDs were dim by today s standards, they were immediately commercialised and ended up being in production for decades. Leaving GE in 1963 for an engineering professorship at his alma mater, the University of Illinois, he schooled over two dozen PhD students who themselves made major contributions to the field. Among them is George Craford, who invented the first yellow LED and is now the chief technology officer at Philips Lumileds, a leading maker of high-brightness LEDs based in San Jose, California. In 1967 Dr Craford began working at Monsanto, then a chemical company, which mass-produced LEDs for fuel dispenser the fuel dispenser first time. LEDs then began to appear as indicator lights in calculators and watches, includ