U212-A Rolling Display

U212-A Rolling Display

Features:

Power : AC220V , 50Hz

Including : 2 displays , 1 power board , 1 transformer , 1 SSR

The content on the display could be changeable

Easily fixed on fuel dispenser

100% Factory Tested

oil, so as to reduce the volume of drained oil. Turn adjusting bolt clockwise to reduce discharge, anticlockwise to increase discharge. Therefore, changing the position of bolt enable discharge approach academic volume and reach the requirements on measurement transducer of national appraisal fuel dispenser regulations. As two regulative bol fuel dispenser ts access to adjusting piston, the adjusting discharge in a circulation per bolt can be calculated in the following formula: △V = 1/2πd12 nt (2--4 ) △V ── adjusting value in per circulation; D1 ── diameter of regulative piston; n ── turning number of adjusting bolt; t ── screw- pitch of adjusting bolt. There is another metal piston measurement transducer in current market. See the Diagram 2-19. Regulative piston is singularly installed in piston rather than connect with rod in this model. Its adjusting value in terms of per adjusting bolt is: △V = 1/4πd2 nt (2--5 ) Common failure and Troubleshooting Metal piston measurement transducer has the two common failures --- accuracy decline and mechanical trouble. Measure accuracy beyond scope The allowed measurement accuracy of fuel dispenser is ±0.3 %, repeated tolerance no more than 0.15 % according to the stipulation of JJG443-98 Fu fuel dispenser el dispenser. The maximum allowed tolerance of min. measured valve don’t exceed ±0.5 %，its repeated tolerance no more than 0.25 %. The ratio of maximum flow (Q max.) to minimum flow (Q min.) is 10 to 1. as fuel dispenser leave factory. The ratio should not be less than 5: 1 in inspecting at operation locale. All of exceeded tolerance is regarded as beyond measurement accuracy. There are many elements and reasons resulting in measurement accuracy beyond scope, including unstable hydraulic system (extensive pressure fluctuation), electric system failure, thick colloid in frictional interface, measurement transducer abrasion, etc. The last two reasons will mainly be introduced in this article. Regulating adjusting

that central junction box. However unlike the normal passive primary junction box it　　 provides an electrically separate drive for each connected cable segment. The LON　　 network is therefore split into a number of smaller networks each of which is more　　 toler fuel dispenser ant of cable performance. It is advi fuel dispenser sed that for maximum tolerance of poor　　 cabling each IFSF device is directly cabled to the active hub as in Appendix C.1.　　 As well as enabling the re-use of existing cables the use of an active hub also has　　 some key advantages: there is no need to test existing cables; there is individual　　 isolation to each device; and site manager s level diagnostics are provided (a simple　　 blinking light to each device to show it is alive). The only supplier currently known to　　 the IFSF with an active hub is BT Electronics for further information access URL　　 www.btelectronics.com.　　 Note 1: the wiring topology shown in Appendix C.3 can only be used if both ends of　　 each loop return to the same port on the active hub and not as shown in the diagram　　 to adjacent ports.　　 Note 2: When installing an active hub each section of the smaller networks must be　　 correctly fuel dispenser terminated as described in 3.4. The BT Electronics active hub is provided　　 with switchable terminators on all ports.　　4.7 Other Considerations　　4.7.1 Cable Cross-section　　 Some of the cables given in Appendix B have an oval or elliptical cross-section.　　 Please note that this can cause sealing problems when installed in dispensers. Cables　　 with a circular cross section are preferred.　　4.7.2 Cable Rigidity　　 Some of the cables given in Appendix B are very difficult to bend. In some　　 installations particularly into the back of a Personal Computer (PC) the movement of　　 the PC or navigating tight corners has resulted in the

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