Alternative classification of electromagnetic flowmeters:

Electromagnetic flowmeter according to flow sensor structure classification can be divided into short tube type and insertion type. Short tubular structure such that the structure of the conventional electromagnetic flowmeter electromagneticfuel meters, flow sensor with measuring pipe is connected to the piping system. Insertion electromagnetic flowmeter sensor is an electromagnetic velocity sensor is substantially, the excitation coil and the electrode assembly into a rod, inserted from the opening in the pipe under test, the measured flow rate converter preset factor multiplication pipeline and area requirements hydrochloride take traffic. In addition to single-point "point velocity", there are side more "run-off speed" are.
Electromagnetic flowmeter according to this classification method can be divided into contact and non-contact electrode electromagnetic flowmeter electromagnetic gasoline flow meter electrode. Electrode contact type electromagnetic flowmeter electrode is in contact with the liquid EMF conventional structure, typically a pair of electrodes, large diameter instrument industry useful two pairs of electrodes. Non-full tube EMF is also useful for three pairs of the motor or strip electrodes. Non-contact electrode type electromagnetic flowmeter is a large area of the electrode close to the lining (or insulation measuring tube) outer surface to capacitive coupling to pick up traffic signals, electromagnetic flowmeters measure the capacitance detection method than the short-contact electrode capacitance electromagnetic flow meter, the principle fancy diagram. Preamplifier placed alone in the sensor electrode, high excitation frequency EMF than usual, for 50 / 2Hz, who also has more than 100Hz. This class does not produce meter electrode passivation, oxidation and catalytic role of the electrode surface effect of noise, but also the opportunity to slurry flow noise and the noise does not exist. Surface covering oil and other non-conductive layer or a thin layer of insulation lining will not affect the measurement; but if it is a conductive film overlay the meter will no indication. Meter factory, said some foreign instruments such as non-electrode electromagnetic flowmeter.

Tanker reasonable error and anti-cheat features

In accordance with the relevant provisions of the tanker maximum permissible error ± 0.30%, each tanker is equipped with a tamper-resistant feature, as long as five times more than this range, it will automatically lock. Traffic center will regularly tanker filling stations for technical examination.
A former mobile fuel dispenser inspection pass rate of about 70 percent fuel "second look"
There is a reasonable measurement error tanker tankers have all anti-cheat tank automation system
It is reported that the tanker is to rely on internal metering metering chamber means to complete, however, due to the usual wear and tear frequent use, it may cause some errors.

Troubleshooting relief valve

In practical use, in order to maximize the effectiveness of pilot relief, protection and control vehicle identification systemaccurate and timely diagnosis, excluding pilot type relief valve failure is the key part.
Pressure limiting instability: pilot pressure relief valve limiting instability, manifested as low or high pressure hydraulic systems, hydraulic actuators action unable or tubing, pump, valve burst. Cause of this failure reasons: improper pressure adjustment; pilot valve spool spring bend or soften; oil too dirty or poor oil flow. Appropriate measures are excluded: readjust; calibration padded or replacement; replacement, cleaning. Pilot pressure relief valve limiting the gradual onset unstable failure, pilot-type relief valve failure.
Pilot type relief valve failure, will cause the injection molding machine inoperable. According to the phenomenon, analysis of the reasons are: the pilot valve spool spring break; Yin Nicon blockage; pilot valve port seal bad; the main valve stuck and so on. Corresponding exclusion measures are: replacement or broken at the flat washers to emergency use; cleaning dredge; grinding or the oil circuit breaker to emergency use; grinding, cleaning.
For all aspects of small tanker spill analysis. Enhance the use of small tankers. Small tanker used very widely, so it is necessary to understand the work of the various parts of a small tanker. Small tanker spill analysis works well for your relief valve failure. Are constantly deepening the internal structure of a small gas station management system. Small tanker analytical works.

Tanker display panel put the gun or firing when hops phenomenon and solutions

Oil-pipeline leaks and spills bottom valve closed lax, both machines will produce oil hops phenomenon when put the gun;
Using non-standard hose fuel management solutions machine oil hose freely lengthened or replaced, but also one of the reasons oil-generated power on the number of hops;
Sensor sensing shaft is too flexible, allowing the tanker to produce power-hops phenomenon, should repair the sensor shaft seal kit damping to reduce the flexibility of their rotation;
The oil valve spring tension is too weak, the shutdown of the oil diesel fuel meter back, driving off hops produce sensors reversal phenomenon;
Dual sensor assembly of photovoltaic panels in the wrong place, can cause the machine to produce oil at the time of switch hops.

Diesel flow meter

Diesel flow meter is large reserves of static liquid product in the tank to vehicle identification system the generic term. It can be used to measure the stock, namely the determination of the total amount of product in the tank can also be used to turn the output measure, that is, as product marketing and tax basis. The main two methods: measurement based on volume and quality. Tank gauging system based on volume, the stock of measurement achieved by measuring the liquid level and temperature. In the tank gauging automatic vehicle identification system based on quality, the stock is measured using a liquid measuring hydrostatic liquid column made??. In turn inventory control measurement or lose, no matter what method, the reliability and accuracy of measuring instruments is very important.