Ultrasonic heat meter is a meter that measures the flow rate and displays the heat energy released or absorbed by the water flowing through the heat exchange system through the ultrasonic method. It is suitable for heating (cold) metering and charging in residential, commercial and other buildings such as central heating, central air-conditioning and cooling and heating combined supply. It is installed in the heat (cold) exchange loop, and the measurement is made with hot (cold) water. The carrier, the displacement released and absorbed on the heat exchange loop.

How to calibrate the ultrasonic table and what is the calibration method?

1. Overall calibration method

The ultrasonic heat meter is best to be verified by the overall detection method. The specific method is to set a flow rate and temperature difference by a standard calibration device. The standard value of the heat is directly given by the standard device, and the heat value of the ultrasonic heat meter under inspection is The standard value of the standard device can be compared to obtain the error of the ultrasonic heat meter under test. Only this kind of calibration method is a true detection for the heat meter, but this method has extremely high requirements for the calibration device, and currently there is no such calibration device in China.

　　2, split test method

The separate calibration method is to use different devices to verify the three components of the ultrasonic heat meter, the flow meter, the temperature sensor and the totalizer. After the errors of the three parts are obtained, the arithmetic sum of them is regarded as the heat meter. The overall error, and no more new errors.

The specific method is: the calibration of the flow sensor is to only detect the performance of the flow meter in terms of flow measurement. Its nature is like the detection of a water meter, but for the flowmeter of a heat meter, it must also be tested under different temperatures of hot water. Metering characteristics. The general approach is to set different flow points and different temperature conditions on the standard device according to the rated flow Qn of the tested flow meter to comprehensively investigate the error of the tested flow meter.

　　 The current popular method is to combine the weighing method with the standard table method, that is, the standard table is used to ensure the automation of the operation, and the weighing method is used to ensure the accuracy.

calibration of temperature sensor: If the temperature sensor and totalizer of some integral watches are fixed together, then the error of the temperature sensor and the error of the totalizer will be added together, otherwise, the local temperature sensor will be separated calibration. The method is to put the temperature sensor in a constant temperature device and examine the error between the temperature shown and the standard temperature at different temperature points. It should be noted that the temperature sensor not only needs to be tested individually, but more importantly, the pairing error must be detected. calibration of totalizer: As the design principles of totalizers are different, it is best to use corresponding calibration methods for their respective principles.