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『Karl flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Increase damping time of flowmeter
The core function of increasing damping time of flowmeter is to smooth the fluctuation data, but it needs to balance response speed and accuracy.
1. Function Analysis 1 Data smoothing: Increasing the damping time can effectively filter out rapid fluctuations in the flow signal, making the instrument display value tend to be stable, especially in pump valve start stop or fluid turbulence scenarios, avoiding severe data jumping
2. Anti interference enhancement: can suppress transient outliers caused by external factors such as pipeline vibration and electromagnetic interference, and output results closer to the actual average flow rate.
2. Adjustment Methods After understanding the role of damping time, the next step is naturally to adjust the method.
1. Local operation: Press the function key on the flowmeter panel to enter the parameter setting interface (usually labeled as "SETUP" or "Parameters"), find the "DAMPING" or "Damping Time" option, enter the target value in the unit supported by the device (seconds/milliseconds), save and exit.
2. Remote configuration: Connect the flowmeter to PC software (such as Emerson AMS Trex) through a HART protocol modem, locate the QiaoWei Zhi dynamic filtering setting item in "Device Parameters", enter the time parameter and synchronize it to the device.
.III. Key Precautions 1 Setting the response lag risk too high (such as>30 seconds) may result in delayed instrument response when there is a sudden change in flow rate, which may miss the timely capture of abnormal process states. In control systems, it is usually necessary to compress the damping time to within 1/5 of the flow regulation per
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2. Types and working principles of air flow sensors
Currently, common air flow sensors can be divided into blade air flow meters, Karman vortex air flow meters, hot wire air flow meters, and hot film air flow meters according to their structural types.
. According to the detection method, it can be divided into two categories: flow rate type and velocity density type. Flow rate type uses air flow sensors to directly measure the amount of air inhaled into the engine. Flow rate type air flow sensors mainly include wing type, Kalman vortex type, hot wire type, and hot film type. Among them, wing type and Kalman vortex type flow sensors measure the volume of inhaled air, so the air mass needs to be calculated by the electronic control unit based on information such as intake temperature; Hot wire and hot film methods directly measure the quality of inhaled air, so their accuracy is higher. Principle: Convert the amount of air drawn into the engine into an electrical signal and send it to the ECU as one of the main criteria for determining the basic fuel injection quantity. It is a sensor that measures the air flow rate inhaled into the engine. Electronic controlled gasoline injection engines must accurately measure the amount of air inhaled into the engine at each moment in order to obtain the optimal concentration of the mixture under various operating conditions, which serves as the main basis for E