Temperature flowmeter

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1. What is a flow meter before a pressure gauge?

Most flow meters measure the flow rate and calculate the volumetric flow rate of the working state by combining it with the cross-sectional area of the pipeline. Then, based on the pressure and temperature in the working state, it is converted into the volumetric flow rate or weight flow rate under standard conditions. So flow measurement must know the temperature and pressure of the medium flowing through the flowmeter. This pressure and temperature parameter can be determined as fixed values based on the design conditions of the medium, or collected by the flow meter within a certain range. Because the temperature and pressure of the medium will change when passing through certain structures during the instantaneous flow meter, the provided pressure and temperature parameters will be specified before (after) the flow meter.

2. Temperature drift problem of thermal capillary flowmeter

The temperature drift problem of thermal capillary flowmeter can be solved through three steps: "eliminating interference → precise calibration → preventive maintenance". The core lies in controlling the stability of the environment and medium temperature, standardizing installation and operation, regular calibration and maintenance.

1. The core cause of temperature drift is the fluctuation of environmental temperature. Sudden changes in environmental temperature (such as day night temperature difference, air conditioning start stop) can cause changes in the baseline temperature difference between the "reference end" and the "measurement end" of the sensor. When there is no flow, heat conduction still occurs, causing zero drift.

; The temperature chang Temperature flowmeter

e of the fluid directly affects the thermal balance of the sensor, leading to measurement inaccuracy. Changes in the characteristics of the medium and the composition of the mixed gas (such as adjusting the gas ratio) can alter the specific heat capacity and thermal conductivity, leading to a shift in the zero point reference; Changes in fluid density, viscosity, and other properties can also affect the sensor output value. Under long-term high temperature or corrosive medium environments with aging and installation stress of sensors, the resistance value of platinum resistance detectors (RTDs) or heating wires of sensors may shift positively, resulting in changes in thermal output characteristics; Excessive tightening or pipeline vibration during installation can cause deformation of the probe package, change the internal heat conduction path, and affect thermal balance.

2. Targeted solution to eliminate external interference Environmental temperature control: Monitor the temperature of the installation point and upstream and downstream pipelines. If the temperature difference is greater than 5 ℃, the shed needs to be relocated or an insulation layer needs to be installed.

; The installation location should be away from strong temperature fluctuation sources such as ventilation openings and heating devices. Media component management: Confirm whether the composition of the mixed gas has changed, and re-enter the parameters through the "component compensation" function of the intelligent flowmeter. Installation stress relief: Check if the probe housing is deformed, and tighten it according to the manufacturers specified torque when reinstalling to avoid excessive compression of internal thermal components. Perf

1. What is a flow meter before a pressure gauge?

2. Temperature drift problem of thermal capillary flowmeter

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