Xian flowmeter vortex street flowmeter| Zhangjiajie ultrasonic flowmeter manufacturer

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1. Analysis of several fault causes of vortex flowmeter

Common fault causes of vortex flowmeter mainly include selection problems, parameter tuning errors, secondary instrument faults, connection problems, installation problems, line faults, environmental factors, and debugging problems. The specific analysis is as follows: Improper selection of type and caliber: After design selection, due to changes in process conditions (such as partial equipment shutdown), the actual flow rate is lower than the original design flow rate, resulting in inaccurate or no indication at small flow rates. For example, the pipeline originally designed for use by multiple devices had a reduced actual flow rate due to the discontinuation of some equipment, and the original selected diameter was too large, resulting in an increase in the lower limit of measurable flow rate. Accuracy cannot be guaranteed at low flow rates. Improvement measures: Combining parameter tuning to improve indication accuracy; If the process conditions change temporarily, the selection or measurement range can be optimized. Parameter tuning error full frequency calculation deviation: Parameter errors lead to errors in the full frequency calculation of secondary instruments, causing long-term inaccurate or large-scale fluctuations in indications. For example, when the actual full frequency is higher than the calculated value, the instrument indication fluctuates violently and cannot read steadily. Inconsistencies in data: Inconsistencies in multiple parameter data affect the final determination and require recalibration and mutual comparison to correct the parameters. Secondary instrument malfunction hardware damage: circuit board disconnection, range setting

or K coefficient display bit damage, resulting in inability to determine range or K coefficient. Display abnormality: The fixing screw of the header coil is loose, causing the header to sink, and the friction between the pointer and the case increases, resulting in large rolling and leakage, and the movement is not flexible. Improvement measures: Repair the broken circuit board and replace damaged display bits; Tighten the screw of the header coil and adjust its position. Connection problem signal circuit interruption: The connection circuit between the secondary instrument and subsequent instruments (such as recorders) is interrupted, for example, if the recorder is damaged and not repaired, and the output of the secondary instrument is not short circuited, resulting in the loss of mA signal. Loose or virtual connection of joints: The surface connection of the circuit is good, but the joints are actually loose or the fastening screws do not penetrate the wire skin, causing circuit interruption. Improvement measures: Check and repair the connection circuit; Tighten the connector or rewire it. Installation issue: Insufficient straight pipe section: The length of the straight pipe section in front of the sensor is insufficient, causing the fluid to enter the measurement area without sufficient stability, affecting accuracy. For example, the downgrading of a certain control instrument due to insufficient straight pipe sections is still acceptable, but the measurement scenario must strictly meet the requirements. Improvement measures: Adjust the installation position or increase the length of the straight pipe section. Line fault balance cable damage: Long term operation is affected by dust, and the balance cable fault cause

Xian flowmeter vortex street flowmeter

1. Analysis of several fault causes of vortex flowmeter

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