U613-A Explosion-proof Terminal Boxes

U613-A Explosion-proof Terminal Boxes

The boxes are suitable to be used in outdoor and indoor places of zones 1 and 2 where there is explosive mixture

Features:

Enclosure is made of casting aluminium alloy,

Surface is sprayed with plastics.

Connection with tube or through wiring.

Explosion-proof approva:l

The flow control valve has been tested and granted Ex approval.

The Ex-approval is EX m II T4.Ex certificate number is CE021037.

Package:

Product ID Net Weight Cross Weight Size

U613-A 32kg/case of 200

37kg/case of 200 22.5x22.5x33.5 cm /case of 200

ariable DC voltage. Diagram 3-9 is a drive circuit. The display mode of volume and sales on main display board adopt 6 digits liquid crystal display fuel dispenser (Model ED-139, see Diagram 3-11), PPU or unit price r digits LCD (Model ED-830, see Diagram 3-12). Diagram 3-9: Static circuit and wave of LCD tube Diagram 3-10: Drive circuit of one-digit tube Diagram 3-11: ED-139 6-digit LCD Diagram 3-12: ED-830 4-digit LCD Display drive chip often adopts 8-digit memory/flip-latch: 74HC95. The drive circuit of liquid crystal display is composed of double D trigger 74HC74 and double input exclusive-OR gate 74HC86. Some fuel dispensers adopt special crystal drive circuit in liquid crystal display, its principle basically similar to 74 series LCD drive circuit. A few fuel dispenser manufacturers adopt light-emitting diode (LED) as display components of display board because its cost is low and need not backlight in evening. The defect of this display component is bad display effect, especially under extensive sunlight, and much electricity consumption. LED display drive circuit also has parallel and serial drive, similar to LCD display drive circuit in terms of structure. Very few fuel dispensers adopt matrix or color liquid crystal display, showing much information. However, it largely increases cost. 2.4 Power supply Stable voltage power supply used in explosion-proof fuel dispenser Most of fuel dispensers adopt explosion-proof type, installing liner stable voltage power supply or switch voltage power supply. Switch voltage stabilizing power supply includes power transformer, DC/DC converter, 220V direct commute and pulse transformer, illustrated in Diagram 3-14 and 3-15. Due to cost-efficient and simple design, liner stable volta fuel dispenser ge power is widely adopted. However, it is affected by exterior network voltage. Although pulse transformer is able to tackle with network voltage fluctuation, it is can’t afford because of complicated technology, expensive cost and difficult to maintenance. In recent years, D fuel dispenser

88138　　 MPA V5.2: SPECIFICATIONS Ref : NT1118R5　　 fuel dispenser TECHNIQUES Nb Pages : 138 + 0 PJ　　 de la LIAISON AUTOMATE-MONETIQUE Date :　　POS Department　　 13.3.1.28.Signature des versions de param ╰res dune application (D5027)　　 Format: C4　　 Tag: DF D3 A3　　 Domaine: toutes cartes　　 Description: permet didentifier sans quivoque une versions de param ╰res mon tiques　　 propres ?une application de paiement. Ces param ╰res sont ceux qui sont transport s dans　　 le message 2 soit directement soit sous forme dobjet compos accompagn dun num ro　　 de version. Tout changement dun de ces param ╰res entra 畁e imp rativement un　　 changement de la signature.　　 La m thode de calcul est laiss e au choix du mon ticien sous r serve de conformit vec le　　 r sultat attendu.　　 13.3.1.29.Etat serveur mon tique (D5028)　　 Format: O1 (Champ de bits)　　 Tag: DF D3 A4　　 Domaine: toutes cartes　　 Codage:　　 Bit Signification　　 8 (MSB) Non utilis　　 7 Non utilis　　 6 Non utilis　　 5 Non utilis　　 4 Non utilis　　 3 Non utilis　　 2 Non utilis　　 1 (LSB) Serveur indisponible　　 13.3.1.30.Indice de compatibilit logicielle dun applicatif (D5029)　　 Format: C2　　 Tag: DF D3 A5　　 fuel dispenser Domaine: toutes cartes　　 Codage: num rique uniquement de 00 ?99; cf Gestion de la compatibilit des applicatifs　　page 108.　　 13.3.1.31.Nombre dapplications actives sur un qu fuel dispenser

has increased over the past 20 years (see chart), the number of children at boarding schools has dropped sharply—from 112,135 in 1985 to 68,255 in 2 fuel dispenser 005. The decline levelled off four years ago, thanks, say some, to the popularity of the Harry Potter books. But the only numbers that have risen significantly are those of students whose parents live abroad. One reason why boarding schools have lost some of their appeal is high fees—the average is around £18,830 ($35,470) a year. Lurid stories of children who harm themselves or take drugs, far from parental eyes, have not helped. Some schools are in trouble financially three mergers have taken place this year; one school in Buckinghamshire will close in August; and another, in Sussex, was recently rescued by parents. Yet Adrian Underwood, national director of the Boarding Schools Association, describes the future as “rosy�? His optimism stems partly from renewed political interest in taking children from foster care and children s homes and sending them to boarding schools instead. Only 6% of those in care in 2004 got five good grades in their GCSE exams (taken at about 16 years of age), compared with 53% of children overall. Boarding schools can offer small classes and good discipline, helping pupils to counter the low expectations that prevent them from achieving all they could. The idea has been around for a while. A handful of charities as well as some local authorities already pay for a few hundred children to board, many of them in the state sector s 36 excellent boarding schools. But the thinking has become more ambitious. The prime minister and his acolytes are convinced that many vulnerable children could benefit. A working party in the Department for E fuel dispenser ducation and Skills has spent months looking at ways to expand the programme. Pilot projects are due to start in September 2007. Among the 80 or so schools that are interested are Wellington, an independent senior school in Somerset, and the Dragon School, a prepara fuel dispenser