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1. Wiring Instructions for Vortex Flow Meter
The wiring method for vortex flow meters varies depending on the type of sensor and transmitter. The specific instructions are as follows:
1. Wiring Instructions for Sensor Transmission System: Three wire system, including power supply, wide skin signal, and power ground three wires. Cable requirements: Use a three core shielded cable, with the shielded wire connected to the housing ground at one end of the sensor and not to the ground at the secondary instrument end. Wiring method: Connect the three cores to the power supply, signal, and power ground respectively.
2. Wiring instructions for transmitter. Wiring type: two-wire system, using two core cable.
. Wiring method: Connect the "+" terminal of the vortex street to a+24V power supply. The "-" terminal of the vortex street is connected to the "+" terminal of the test instrument signal input. Short circuit the signal "-" end to the 24VDC "-" end to form a circuit. This circuit outputs a 4-20mA current signal.III. Supplementary Explanation of Performance Characteristics Signal Output: The transmitter can output a 4-20mA two-wire current signal corresponding to the flow signal, which is suitable for long-distance transmission.
. Display function: It can simultaneously display cumulative flow and instantaneous flow, facilitating real-time monitoring. Correction function: It has five non-linear correction functions, which can improve measurement accuracy. Anti interference design: small signal cutoff function to avoid small wave interference. Damping time can be freely set to optimize signal stability. Process advantages: Adopting surface mount technology, with small volume and compact stru
2. Analysis of several causes of faults in vortex flowmeters
Common causes of faults in vortex flowmeters mainly include selection problems, parameter tuning errors, secondary instrument failures, connection problems, installation problems, line failures, environmental factors, and debugging problems. The specific analysis is as follows: Improper selection of caliber: Due to changes in process conditions (such as partial equipment shutdown) after design selection, 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 viole
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