Measurement of stainless steel tanks
Release time:
2019-08-16
1. Manual Inspection Ruler
Stainless steel tank measurement begins with a manual gauge, which is still used today and is used as one of the tools for performance verification of other level gauges.
2. float steel strip level gauge (including photoconductive electronic type)
The typical accuracy of this mechanical measuring instrument is10mm. Due to the friction of the pulley, coil spring mechanism and mechanical counter.
3. Servo Level Gauge
Servo level gauge has been greatly improved on the basis of float-driven level gauge. An elaborate float replaces the previous large and heavy float, and an electric servo motor replaces the coil spring mechanism to lift the float. A force measuring system continuously measures the weight and buoyancy of the float and controls the servo system, and the servo motor drives the transmitter at the same time. This level gauge can not only measure the liquid level, but also measure the oil and water level. in greaterOn the oil tank with the upper limit of 40m measurement, there is generally an accuracy of 1mm.
4. radar level gauge
1. Measurement principle
Using radar wave to measure the liquid level of oil tank is a new method, the radar level gauge has no moving parts, only the antenna extends into the tank, so the use and maintenance cost is low. The radar table uses microwaves, and the measurement of the liquid level is usuallyNear 10GHz. The transmission distance of the radar wave is calculated by the frequency of the transmitted wave and the reflected wave. The oil tank is relatively low, and the resolution is required to be high, so it is impossible to measure the reflection time. The solution is to change the frequency of the transmitted wave and measure The frequency difference between the transmitted wave and the reflected wave can calculate the transmission distance of the radar wave. This type of level gauge, although compared with the float type high investment, but the use of low cost.
2. The influence of temperature, pressure and material characteristics on the measurement and the relationship between the temperature in the tank
Microwave propagation does not require an air medium, so its propagation rate is not affected by temperature changes. According to the determination, whenWhen T = 500 ℃, the change of reflection time is 2%; when T = 2000 ℃, the change of reflection time is much less than 3%. Therefore, the radar level gauge is suitable for level measurement of high temperature media.
3. Relationship with operating pressure in the tank
Microwave propagation is not affected by the change of air density, so the radar level gauge can work normally under vacuum or pressure, and the microwave propagation rate under vacuum state changes by% compared with that under air state.29; but when the operating pressure is high to a certain range, the pressure on the measurement error can not be ignored. Now launched radar level gauge products, allowing pressure of 64MPa.
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