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LPG Dispenser

LPG Dispenser
LPG Dispenser
LPG Dispenser

 

LPG Dispenser

 

Many types of Liqued Petrolium Gas (LPG) and Fuel dispensers are sold in the market. Mostly (LPG stations, LPG filling plants, LPG skid stations) LPG dispenser’s models with a supply hose on both sides and defined as double LPG nozzles are sold. Hoses must comply with EN 1762. Firms that have a special supply area at small LPG stations, some skid LPG station or for their own fleet prefer single LPG nozzle ones. Although different brands of LPG dispensers show some differences, the main elements that make up the LPG dispenser are the same in all.  LPG dispenser’s case structures can be galvanized painted (DKP), 430 steel or 316 stainless steel. Also it must have ATEX2014 / 34 / EU, and MID B-SK 18 044 MI-005 MID D SK 19- 061 D certificates in accordance with the legal LPG regulations.

 

The working principle of LPG dispensers is as follows; LPG, delivered from the transfer pump, enters a vapor separator under the dispenser. Liquid gas coming out of this separator passes through the non-return valve (check valve) and reaches the dispenser’s prima meter. In the prima meter, according to the dispenser type, it passes through the differential pressure valve in liquid form with a pressure of around 10 bar. The task of this differential pressure valve is to keep the product liquid under pressure. Meanwhile, the evaporation that may occur is connected to the vapor return line from the vapor collector part on the valve. Liquid LPG coming to the supply hose in liquid form is filled into the vehicle tank with a filling gun. Lpg steam coming from the vapor separator and differential valve is returned to the tank from the return line in order for the system to operate without error. There should be no closed valves in this return line up to the point of entry back into the tank. The Prima Meter is the device that measures the amount of liquid LPG passing in the LPG dispenser. Prima meter must have OIML R 117 certification. It has 4 pistons, 0.5% measurement accuracy. It is operated with 14.000 gaus magnet with improved magnetic system. It has a self-cleaning feature. All parts are created according to the lego principle. Its parts can be replaced easily and at low cost. The crank mechanism is forged steel. Long life. 2A LPG dispenser’s Electronic brain; It has 2A patented, 120-280 volt, 50-60 hz, 72 hours information protected, high voltage based transformer. The LCD screen is self-illuminating. Connection method can be made by RS-232, LAN or USB. Electronic software is available for communication in accordance with the Gilbarco and Wayne Dart protocols. In this framework, it is compatible with automation and cash registers. The LPG dispenser filter has an inlet and outlet valve and should have both 10 micron microglass paper and metal protection. Other important features of the LPG dispenser are as follows; It should see errors in the system and stop working in case of failure. In order to prevent the Asco Solenoid valves from drawing excessive current, excessive current drawing should be prevented with a separate fuse / relay / varistor etc. Also, when there is no sale, the current draw of the solenoid valve should be prevented. If it does not see the LPG flow, it should stop working. It should automatically shut off the flow with a detection such as a sudden increase in flow rate when there is a hose rupture while filling the vehicle, etc. when LPG flows into the atmosphere. The slow flow time at the end of the program should be adjustable. The device called Eltomatic “pulser”, which works in integration with the prima meter inside the LPG dispenser, displays the LPG delivered to the vehicle by means of a shaft in liters and the corresponding money price on the dispenser screen. What should be considered in dispensers is that the filling hose is suitable for LPG, that it does not melt, decrease, or deteriorate on the basis of liquid and vapor, that it can withstand LPG pressure, that is, it is resistant to high pressure and has a cable or tissue that conducts electricity. This is essential in order to prevent the static electricity that may occur as a result of spraying while refueling. The presence of ex-proof certified metal cable glands in the LPG dispenser is an important detail for dispenser safety.

 

The ATC (Automatic Temperature Compensation) device in the dispenser allows you to calculate the expansion in the product according to the temperature difference that may occur until the liquid reaches the outlet and supply hose from the tank and provides the product per gram. It has a high-tech microchip probe that measures 0.0001 ° C change. It should be able to make volume correction according to temperature.

 

The ATC system must be coupled to the electronic system and the density change must be made with a password entry. The ATC system must be as requested by the Ministry of Science, Industry and Technology, and both the ATC probe and the ATC-brain connection must be sealed. Sales should not be made while ATC is in off position. It is preferred to have a safety valve in dispensers and a valve to drain if there is water in the product. The centrifugal pump capacity used for single nozzle LPG dispensers has become 45-50 liters / minute, and for two nozzles dispensers it has become widespread as 90-100 liters / minute. Italian T3, acme, LPG cylinder filling (for bottling plant)  type nozzle can be used on dispenser hose ends.

 

Dispensers generally operate under 7-10 bar pressure. The prima meter inside the LPG dispenser that will transfer the product to the vehicle storage inside the dispensers transfers the LPG as liquid with a fixed volume. At each turn of the prima meter shaft, the dispenser counter is operated by means of an Eltomatic "pulser" shaft. Displays the amount given in liters and its money equivalent on the dispenser screen

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