Process control with flow measurement characteristics

Process management is the application flow meter (electromagnetic flowmeter, vortex flowmeter, orifice meter) industry, flow meter in the efficiency of process management is to seal in the fluid mechanics flow in the pipeline to carry out the test, some position will also flow measurement instrument with adjustment meter, electric actuators, etc system software, will flow smoothly in suitable values, gradually realize the whole process of anti aging.For such a special daily task, the flowmeter also has the following requirements.

Flow meter

(1) reliability requirements

Instrument should have the reliability of aspect ratio.Tend the continuous process of import substitution industrialization equipment, instrument fault is very easy to cause the whole process is not smooth, and installed in the pipeline flow meter once malfunction, and is unlikely to maintenance specially would step slow down, so the instrument manufacturing and control system design must be the first to consider the reliability, contains the reliability of the thermal resistance to temperature compensation.

Some instrument manufacturers to contrast very prone to failure of trouble maintenance component to implement two-way, such as the type 8800 c vortex flowmeter has dual controller products, under the control of CPU, can fully automatic identify two data signals of the controller, once in one of the fault, it is to give up, and enhance the reliability of the intelligent transmitter.Also, some manufacturers have designed the way to remove the controller under the continuous flow standard.Some electromagnetic induction meter Qiao manufacturers to produce a continuous flow conversion electrode method and special tools, this is to improve the reliability has created excellent standard.

(2) fault diagnosis.Once the instrument has a fault, part of the fault diagnosis should also fully automatic remind of the location and characteristics of the fault, so as to reduce the time for troubleshooting.

After the instrument sends the confirmed information content into the computer by means of digital communication, the computer can monitor the operation of the instrument, send out the alarm system when the instrument fails, display the information fault content, and even adopt necessary security measures.

(2) reliability requirements

(1) the output of the flow meter should have excellent reliability, if the flow data signal itself has noise, should be able to adjust according to the table vibration reduction, make the value stable to be conducive to reading.When composing the adjusting system software with the controller, there should be no significant oscillation in the output of the controller.

(2) the flow meter value of the operating temperature hazard should be within the required performance index range.

Meters need to have good long-term reliability.Nowadays, most instrument enterprises have indexes for intelligent differential pressure transmitters in these aspects, such as eja-110b smart transmitter service commitment, whose long-term reliability is no more than ±0.1% FS every 24 months, and 2010 TD smart transmitter service commitment no more than ±0.os%FS every 12 months.

(3) response speed regulation there are a lot of flow measurement instruments and controller together constitute the adjustment system software, and the response speed of flow measurement instruments Is within Is.In the flow time constant adjustment system software, if the total time constant of the flow accurate measurement stage exceeds Is, it will cause significant harm to the quality of adjustment. When it Is more serious, the guidance system software will be shaken and cannot work.

(4) anti-interference provisions

(1) anti vibration interference ability.Most of the flow controller installed in the pipeline, the spot of the natural environment standard is more extreme, in which the vibration is a big dry torsion, so the flow controller, converter and so on need to have a strong anti-interference.Some models and specifications of vortex street flowmeters and coriolis quality flowmeters that is to say, due to the lack of anti-vibration interference ability ideal, in the spot use is not very good, there are "made-up" and the value of partial colleges and universities.

(2) anti - frequency interference ability.The installation on the spot in the industrial production of electromagnetic flowmeter with a variety of interference sources, such as industrial workshop in driving, forklift opened or surrounding many application wireless interphone, is causing some flow meter value rise, says that because the household electrical appliances, in driving a forklift frequency radio waves from the ignition coil, radio frequency radio waves from the wireless antenna via some way into the instrument, scratching their job.

In recent years, people begin to attach great importance to the hazard of frequency-dry torsion. The vortex street flowmeter is equipped with frequency-dry torsion hazard index, and many countermeasures are adopted to improve the anti-interference.

Shanghai cixi instrument co., LTD. Is a family enterprise, engaged in the development and production of high-precision flowmeter, which can be applied to almost any pump.Our factory in order to ensure the after-sales and price, cancel the intermediary agent, and end customers and market to maintain close contact, the quality of the flowmeter has reached the world's first-class level.