Calibration and Troubleshooting of Displacement Level Gauge

How is the float level gauge calibrated? What are the common troubleshooting methods for float level gauges? The calibration of the float level gauge is a standard detection instrument. The float level gauge needs to be calibrated regularly to confirm the accuracy and linearity of the float level gauge; Displacement level gauges are calibrated for field use. The purpose of the two kinds of calibration work is different, and the actual use tends to focus on the latter. The calibration of the float level gauge has two methods: the standard method - the weight hanging method and the comparison method - the on-site water calibration method. 1. The hanging weight calibration method is known from the measurement principle of the float level gauge. The float level gauge measures the liquid level height of the liquid according to the torque. Therefore, the calibration of the displacer level gauge should be carried out according to the set torque to perform zero point and full scale calibration. This calibration method is called hanging weight calibration. Like the calibration process of the target flowmeter, the displacer level gauge also needs to simulate the force of the displacer through standard weights, and adjust the zero point and fullness of the displacer level gauge respectively. The weight hanging method has high calibration accuracy and good linearity, and can be adjusted within the full range. It is mainly used for regular calibration of the performance test of the displacer level gauge itself. Also use this method. To calibrate the displacer liquid level gauge by the weight hanging method, the first step is to calculate the wire tension at the zero point and the full range of the displacer liquid level gauge. Through the formula: F=mg-πd2/4ρgH, the weight of the required weight when the liquid level is zero can be obtained. is the weight of the float itself. The weight of the required weight at the full range is the value of F when H is the maximum value. At this time, the density ρ of the tested liquid is the density of the liquid under standard conditions. When calibrating, remove the buoy from the connecting wire, put the weights required for zero point and full scale in light plastic bags respectively, observe the display of the transmitter to see if the zero point and full scale are accurate, and carry out the corresponding adjustment. Adjustment. Then calculate the weight of the weight required for the liquid level height to be 25%, 50%, and 75% respectively, and then mount it to check the linearity of the liquid level gauge. 2. On-site water calibration method The water calibration method is a common calibration method for external buoy liquid level gauges. It uses clean tap water, which is the most easily available in life, as the liquid to be tested for simulation testing. This calibration method can be quickly adjusted on site without dismantling the liquid level gauge, and is widely used in on-site external displacer level gauge setting calibration, fault maintenance calibration and zero-point full-scale check calibration. When calibrating the displacer level meter with water, you must first modify the parameters in the transmitter, change the density value of the liquid to be measured to the density of water, and then obtain a new measurement range. Note that the measurement range cannot exceed the maximum tolerance of the transmitter. scope. The water calibration method is a comparative calibration method. The density of clean tap water is regarded as 1, and the density ρ of the tested liquid is compared with the density of water, and three situations can be obtained: 1. If the density of the tested liquid is greater than 1, even if all the measuring cylinders are calibrated by the water calibration method Even if it is full of tap water, the tension value of the steel wire cannot reach the full range of the measured liquid. The maximum calibration value at this time is within the real setting range, which is an incomplete calibration. 2. If the density of the liquid to be measured is less than 1, when the measuring cylinder is filled with tap water, the tension of the steel wire exceeds the normal setting range when calibrating with water, especially if the density of the liquid to be measured is very small, the over-range calibration may damage the transmitter. At this time, you should check the parameter range requirements on the buoy label, and perform the calibration height conversion so that the water cannot fill the measuring cylinder to protect the transmitter from damage. ③. When the density of the tested liquid is very close to 1, the best calibration effect is to simulate the tested liquid with water. Operation steps of the on-site water calibration method 1. Preparatory work First cut out the outer float level gauge, close the hand valve in front of the outer float, open the sewage pressure relief valve, discharge the measured liquid in the measuring cylinder, and unscrew the drain on the top of the measuring cylinder. Air plug, use clean tap water to pour into the measuring cylinder from the plug, and fully clean and replace the remaining measured liquid and dirty impurities in the measuring cylinder. 2. Modify the measurement range Modify the parameters in the transmitter, change the density of the measured liquid to 1, and check whether the new measurement range exceeds the maximum allowable.
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