TD-500: Difference between revisions

To prepare the tank you should:

* Empty the tank, clean and dry if necessary

* '''Remove fuel vapors and air from the tank''' (especially for a gasoline tank, but in the case of a diesel engine, this procedure should not be neglected, since gasoline could be added to the diesel); to do this, you can heat water to boiling point and direct the resulting steam into the tank or use carbon dioxide so that it displaces fuel vapors and air; ensure that any open flame sources are sufficiently far away from the fuel tank[[Файл:Удаление топливных паров.png|715x715пкс]]

* '''Find the geometric center of the tank''' '''and''' '''drill a hole''' in it using a '''ø3mm''' drill bit. Then, using a piece of stiff wire, examine the tank for the presence of partitions in it[[Файл:Выбор места установки ДУТ.png|без|мини|831x831пкс|'''<big>Выбор места установки ДУТ</big>''']][[Файл:Сверление бака и последующее исследование бака на наличие перегородок.png|без|мини|835x835пкс|'''<big>Сверление бака и последующее исследование бака на наличие перегородок</big>''']]

* If the space inside the tank in the selected location is free, '''drill a ø 35 mm''' hole using a bimetallic bit; When drilling, keep the bit tilted slightly to prevent the cut section from falling into the tank. Use a magnet to catch chips and prevent them from getting into the tank.[[Файл:Сверление отверстия под углом.png|без|мини|714x714пкс|'''<big>Сверление отверстия под углом</big>''']][[Файл:Удаление высверленного диска.png|без|мини|864x864пкс|'''<big>Удаление высверленного диска</big>''']]

* If it is impossible to install the sensor in the geometric center of the tank, try choosing another location as close as possible to the geometric center of the tank; this point should coincide with the place where the height of the tank is maximum. This way you reduce the risk and amplitude of level fluctuations associated with fuel movement while driving.

'''The highest point must be chosen so that the sensor can measure the level of all the fuel inside the tank without any blind spots.'''

The fuel level readings from a sensor installed in the center of the tank will be least affected by movement and fuel overflow in the tank.

If it is not possible to install the sensor in the center of the tank, consider installing two sensors diagonally at two corners. When fuel flows to one side of the tank, the level on the corresponding sensor will rise, and on the opposite side, the level will correspondingly decrease, while the average level will remain unchanged.

<blockquote>'''Attention:''' Before starting the calibration, the vehicle/fuel tank must be positioned flat in relation to the horizon, i.e. on a level surface without a slope.</blockquote>If the tank has an irregular geometric shape, the sensor must be installed at the maximum depth of the tank, closer to the geometric center.  

To increase accuracy and reduce level fluctuations, install two sensors in one tank. This solution is mainly used in tanks with a capacity of more than 600 liters and having a length of 1500 mm. Sensors must not be installed close to the walls of the tank.

Also, two or more sensors should be installed if it is not possible to install the sensor in the center of the tank and (or) the tank has an elongated shape, i.e. The length of the tank is significantly greater than its height.

 

'''Note.''' Installing a single sensor in an elongated tank will allow you to detect drains and refills. But increased level fluctuations while driving may not allow the monitoring platform to correctly read fuel consumption. Therefore, installing two sensors is preferable.

Before calibrating the sensor, you should '''determine the future length''' of the measuring tubes in accordance with the height of the tank and '''cut or extend them'''. The length of the tubes should be calculated according to the following formula:

'''L = H - 15 mm,'''

where L - tubes length after changing the length

H - height of the tank at the installation point.<blockquote>'''ATTENTION!!!''' '''The minimum length''' of the tubes should not be less than '''15 cm (150 mm)'''. Otherwise, it will most likely not be possible to obtain adequate graphics. The maximum length of the tubes can reach '''6m.'''</blockquote>

Use a hacksaw to cut the tubes. When sawing, be careful not to damage the connection of the tubes to the circuit board inside the sensor head and to prevent metal shavings from falling into the tubes.  

'''Avoid getting shavings inside the tubes - this may lead to a short circuit in the sensor; if this happens, blow the tubes with compressed air through the drainage holes under the sensor flange.''' Sand the edges of the tubes with sandpaper to remove any burrs or irregularities.

To extend sensor tubing, use a collet extension and an additional tube.

Inner nuts (yellow elements) are used to connect the inner tubes. Once they are installed and the studs are screwed into them, the tubes do not have to touch each other, but try to get them as close to each other as possible.

The outer coupling and the corresponding nuts must be securely tightened. '''The outer tubes should touch each other.'''

'''Connect the sensor to the USB-RS-485 converter using a 6-pin MOLEX connector''' or using cable clamps if a cable route is connected to the sensor. Orange wire is line A of the RS-485 sensor interface, white wire is line B of the RS-485 sensor interface, black wire is GND, red is PWR..