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saab 93 awd fuel level gauge troubles
Saab 93 awd fuel level gauge troubles: The fuel tanker liquid level measurement control system can meet the requirements of relevant international conventions on fuel tanker stowage, air pressure monitoring, etc.
To realize the closed tank loading and unloading operations of fuel tankers, protect the crew from toxic gases, and avoid manual measurement of fuel tank liquid levels that may be caused by static electricity and other human factors. explosion and thus pollute the environment. There are three main types of tanker liquid level measurement systems: mechanical, pressure, and radar. Float type, including steel belt float type, air blowing type, float reed switch type, etc., has a single function (only liquid level can be measured, but not density, loading capacity, medium temperature, inert gas pressure, ship inclination, etc.), The accuracy is low, the reliability is poor, and the relevant valves cannot be controlled automatically, so it is rarely used in new tankers at present. Pressure type, the pressure sensor is in contact with the measured liquid, which is prone to failure. Once the pressure sensor is faulty, it is necessary to stop the voyage and clean the tank before entering the fuel tank for repair or replacement; but in reality, it is often necessary to wait until the ship is planned for repair (it is impossible to stop the voyage and wash the tank simply for repair or replacement of the pressure sensor), which makes it impossible during this period of operation. The safety of loading and unloading is affected by the closed cabin operation.Radar type, only one fixed radar antenna is exposed in the fuel tank, has no contact with the measured liquid level, can work in extremely harsh environments, has high measurement accuracy, is safe and reliable, has few failures and is easy to maintain, and is widely used.
In order to ensure the measurement accuracy, the radar antenna of the Saab TankRadar large tank liquid level measurement system transmits a continuous narrow wave modulated by frequency scanning, that is, the frequency of the radar wave changes with time. Suppose a certain time T. The frequency of the wave is F1; when the time T is reached, the frequency of the transmitted wave has been changed to F2, and at this time the frequency reflected by the tank oil surface back to the radar receiving antenna is still F1, and the frequency difference is the absolute value of F2-F1. In this way, the time T required for the radar wave to propagate between the radar antenna and the liquid surface of the large tank (that is, the gap in the large tank) is related to the frequency difference, and the frequency difference is a function of the gap, so as long as the frequency difference is measured, it can be calculated Get out of the big cabin. see the principle.
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