Should be cleaned regularly in order to normal use orifice flowmeter orifice meter meter probe, was found in the examination and individual probe test holes have been contamination jams, and even be plastic wrapping, affected the normal measurement. Regularly check grounding and shielding case, eliminate the interference. The problem is due to interference by sometimes instructions. Should be drying time, regularly and moistureproof processing. Because at the end of the probe itself and moistureproof processing, affect running after be affected with damp be affected with damp. Meter data management should cause enough attention, to facilitate the future work. And eastern chemical works lack calibration method and ability, can only be out of calibration, the influence of process operation, should be removed from the pipe orifice meter to send up to 5, and 6 days of calibration time, process is hard to meet, to determine the coefficient K. Line road connection problems. Part of the loop line connection is very good on the surface, and check carefully, some loose joint has actually led to the suspension of circuits, although some joint connection is tight but due to line problem tighten screw fastening on the line of leather, also makes the circuit interruption. Solve the problem of the corresponding line, existing problem and corresponding solution. Secondary instrument and subsequent instrument connection problems. Due to the subsequent instrument problems or as a result of the subsequent instrument maintenance, the secondary instrument of mA output circuit interruption, for this type of secondary instrument. Especially for the subsequent recorder, in the case of recorder damaged beyond repair for a long time, it is important to note that the short connect the output of the secondary instrument due to secondary instrument flat shaft cable fault loop always without instructions.

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In view of the different fault of plug-in electromagnetic flowmeter is answering questions plug-in electromagnetic flowmeter in the process of use due to various reasons will appear some problems, then we analyze some common fault for everybody the cause and the solution to help you later at the time of these problems can be solved better. Common failure analysis and solution: first, the flow measurement is not accurate to 1. Measure the fluid problem not completely full of measuring tube; 2. Signal connection has a problem; 3. Coefficient of sensor, the sensor zero no sensor sign or factory set up check list. Solution: 1. Make the pipe fluid filled with sensor measurement; 2. Correct connection for signal lines; 3. Coefficient of sensor, the sensor zero according to the factory check order Settings. Second, the liquid flows have output 1. Between the converter and signal transmission cable connection circuit; 2. Signal cable to the electrode connection circuit; 3. Electrode surface contamination or sedimentary insulating layer; 4. Bad earth or open circuit. Solution: 1. Connected cables; 2. Open the sensor, in again; 3. Scrub electrode surface; 4. Good earthed. Electromagnetic flowmeter. JPG three, liquid flow without output 1. Between the converter and signal transmission cable conductor by the two; 2. The power did not pick up or poor contact; 3. Sensor instrument piping, shell, end face has a leakage. Solution: 1. Adjust the wrong wiring of cables properly connected; 2. Connected power supply, keep good contact; 3. Repair sensor or replace a new sensor. The above is the analysis of the causes of some common faults plug-in electromagnetic flowmeter and the solution, if you have other want to know can call to inquire at any time, a superfamily real instrument welcome your calls.
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Abstract: remote transmission tube float flow metering strap LCD display signal in detail information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. My company production of metal tube float flowmeter with far eastone standard dial with liquid crystal display signal, its detailed specification is as follows: 1. 1 intelligent flow meter board is dedicated to high performance is the HART protocol intelligence metal rotor ( Float) The flow transmitter. If you are using. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a remote transmission tube float flow metering strap liquid crystal display signal detailed introduction for details. My company production of metal tube float flowmeter with far eastone standard dial with liquid crystal display signal, its detailed specification is as follows: 1. 1 intelligent flow meter board is dedicated to high performance is the HART protocol intelligence metal rotor ( Float) The flow transmitter. If have not clear place in the process of using or find other problems, please promptly with the company. The company will reply as soon as possible, and solve your problem. 1. Main performance index dimension: 2 LCD interface card about 70 & times; 70 mm power supply voltage: DC 12 v ~ 32 v; Power supply: no greater than 0. 01% / V; The output load change: no greater than zero. 05% ( 50 ~ 1000 ohms, the lower limit and range of variation) ； Accuracy: & le; ± 1%; Stability: & le; ± 0. 2%; Operating temperature range: - 20 ℃ ~ + 70 ℃ ( With backlit LCD display) ； －40℃～+85℃（ There is no LCD display) ； Temperature: & le; ± 1％/50℃； Can choose Ann explosion-proof, explosion-proof grade ia Ⅱ CT5. 1. 3 H8250FZ main function output: 4 ~ 20 ma output, superposition of HART communication; Diagnosis function: instrument failure, output alarm output current; Configuration function: engineering unit, the density of measured medium, medium density, float, range, display and alarm value of configuration; And has the function of zero, zero point correction of the cumulative discharge; Alarm function: you can set the alarm on the floor. Output is lower than the lower limit of 3. 8mA； Output is higher than the upper limit of 22 ma. Monitoring dynamic variable function: instantaneous flow, percentage, output current and cumulative flow, etc. Current calibration function: can be calibrated to the analog output current; Flow calibration function: can choose 2 ~ 16 point calibration; On the configuration features: the engineering unit, the density of measured medium, medium density, float, range, display and alarm value configuration with zero, zero point correction of the cumulative discharge, data recovery function; On the current fine-tuning: to 4 ma and 20 ma fine-tuning. By buttons. Liquid crystal display function: double line LCD display, can show the instantaneous flow and cumulative flow, at the same time also can display the current, the percentage and so on. Data backup and recovery: manufacturers for instrument configuration, calibration, after the original information to manufacturers for backup, user site illegally adjust the instrument can work normally, the input damping & other; 5678' Information transferred to producer, and cover the user illegal error messages, to normal working condition. Instrument has the function of power-fail protection and flow accumulation (note: the card factory status to on-site configuration adjustment function, the user can set to trimming function on the current. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: the differences of vortex and orifice meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. One, the vortex street flowmeter and the orifice meter comprehensive performance evaluation of orifice meter ( Orifice plate) Through the throttling parts of pressure device and differential pressure transmitter, pressure guide tube for easy cold place requires heating measures, a flow measurement circuit of the static sealing points to 2. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a vortex and the differences of orifice meter scale article details. One, the vortex street flowmeter and the orifice meter comprehensive performance evaluation of orifice meter ( Orifice plate) Through throttling a pressure device and differential pressure transmitter, pressure guide tube for easy cold place requires heating measures, a flow measurement circuit of the static sealing point is about 20, the use of the following problems: easy to cold, easy to block, easy to leak, heating cause differential pressure transmitter components ageing, some occasions add spacer guide pressure tube and unstable due to heating or process operation, positive and negative guide spacer fluid pressure pipe line, often produce liquid column is poor, the flow indicator is not allowed. Above change will make the flow coefficient, measurement accuracy is reduced, pipe shortened lead pressure differential pressure transmitter directly installed on the pipeline, but there are still a flow dead zone. Vortex street flowmeter ( Vortex street) Only three static sealing point, not easy to leak, no dead zone, without thermal insulation, are not affected by severe fluid, temperature, pressure, and viscosity, flow coefficient unchanged for a long time. But there are vortex in vibration occasions, when using can make the flow measurement is not allowed. At present, the market has launched anti vibration type vortex street, to overcome the effects of vibration is not allowed for flow measurement. （ 1) Initial investment in a imported vortex street is about 20000 yuan ( DN15 - DN50) And a throttling device including differential pressure transmitter, orifice plate and flange, pressure pipe, valves, heat preservation box or protection box also need to 1. 50000 yuan, from a long-term point of view, using vortex street is still worthwhile. ( 2) Installation cost vortex street is simple, just before and after the meter has certain straight pipe, line segment, concentricity, orifice tube, and transmitter incubator has certain vortex street is the cost of installation requirements, several times. （ 3) Maintenance vortex street except on the metering requires periodic calibration, generally do not fail, while the orifice otherwise, leakage, regular drainage, irrigation, spacer, replace the pressure pipe, valves, heat preservation, clean the orifice plate, etc. , have a certain amount of maintenance. Such as 200 sets of flow orifice measurement circuit ( Need to heat preservation heat tracing) , every two years, the heat preservation heat tracing system reform will have to put some repairs, this does not include the differential pressure transmitter updates, orifice renewal fees. It enough to buy a certain quantity of imported vortex street. （ 4) 1 running cost. Steam consumption costs such as 200 sets of flow orifice measurement circuit ( Need to heat preservation heat tracing) , each with hot steam consumption is 0. 02 t/h, if calculated by an average of 4300 hours a year, steam cost is 40 yuan/ton, it needs steam consumption cost is about 68 a year. 80000 yuan, each loop annual cost is zero. 3. 44 million yuan. 2. Energy costs of vortex street pressure loss is smaller than orifice, about 1/15 of the orifice plate. Therefore, long-term operation of pump and fan can cost less. Orifice plate is 15 times of vortex street, when used for gas or steam flow measurement, due to the density is small, the same pipe diameter volume flow is big, the pressure loss is more serious, energy consumption cost is higher. 3. Leakage discharge sewage charge depending on the number that is about 20 times a year or so commonly, discharge of sewage and material atmospheric environmental pollution, sewage, the environmental protection department also want to its fine. （ 5) The design of the long running accuracy of orifice system accuracy of 1. 5% - 2. 5%, due to the differential pressure and flow rate is a linear relationship, the Philippines when the flow rate is less than 30%, the error increases, gas is too serious, on the other hand, due to the use of medium long-term wear, acute dull, make the flow coefficient is changed, is also an important factor affecting the accuracy. Due to the special structure of the vortex street, after the accuracy determined by way of actual ( Is about 0. 5% - 1% measured value) , the accuracy is almost the same. （ 6) Interchangeability a single vortex street can measure the rate of flow of gas, liquid and steam, electronic circuit board and sensitive element for different caliber of flowmeter has is generic and signal output usually has three forms: pulse, analog and digital signals. Can be switch on/off switch on the circuit board, the user may at any time according to their own need to switch to another output signal. Change the range is also very easy, for analog output, only need to change the input pulse frequency. Orifice plate, otherwise, the aperture is designed for a particular medium, poor compatibility, change range is more difficult, need to recalculate the orifice plate. （ 7) Range than the output frequency of vortex street and a linear relationship with flow, the flow of the range of part - 80:1, for example: Foxboro company of vortex street flowmeter measurement of gases and vapors range ratio of 80:1, the measuring range of liquid than 40:1, able to meet the requirements of process flow measurement range is bigger, still can guarantee the accuracy. Differential pressure and differential pressure flowmeter flow into nonlinear relationship, in small flow rate measurement is allowed to, range than only 3-1-5-1. If extended range than, must try to improve the accuracy of differential pressure transmitter.
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How to solve the problem of insufficient back pressure of the mass flowmeter and the pressure control method Taking the existing pipeline as an example, the mass flowmeter is usually installed in the oil delivery station, the distribution metering station and the terminal station. According to the different measurement ranges, two sets are usually installed Or multiple flowmeters, mainly used for flow detection in transfer measurement. The mass flow meter is used to adjust the pressure of the oil from the upstream, and then measure it after degassing and filtration. After the flow meter, a regulating valve is installed. The regulating valve has the functions of throttling and back pressure control, and then it is transported to the oil tank area of ​​the oil depot. When the distribution metering station or terminal station is built on the basis of the reservoir area, the distribution station is closer to the oil tank area, the distribution pipeline is shorter, and the friction along the way is relatively small. If the distribution flow does not reach the maximum value, and the regulating valve is not set or the opening of the regulating valve is unreasonably set, the back pressure of the flowmeter may be low (ideal work regardless of the elevation difference between the oil depot and the metering station) situation). In order to ensure sufficient back pressure of the flowmeter, it is necessary to properly design the installation of the flowmeter to achieve effective control of the backpressure. Through reasonable selection, the problem of insufficient back pressure of the flowmeter can be effectively avoided. First, select the structure and material of the flowmeter according to the measured medium characteristics. There are many kinds of measuring tubes for mass flowmeters, which can be divided into continuous type, double tube type and single tube type according to their different structures. For the measurement of easily vaporized liquids or liquids containing air bubbles, a tube type that is not easy to accumulate gas or air bubbles should be selected. Secondly, for volatile media such as refined oil, it is necessary to calculate the low back pressure required to prevent cavitation when selecting a flowmeter. If the actual working pressure is higher than the low working pressure that does not cause cavitation, cavitation will not occur; if it is lower than the low working pressure, cavitation may occur, for which the following measures can be taken: a. Increase the diameter of the measuring pipe, reduce the high flow rate, and re-select the table; b. Increase the working pressure in the pipeline; c. Choose a flowmeter with a small overcurrent pressure drop. Appropriately reduce the pipe diameter of the distribution branch line and increase the length of the distribution pipeline as much as possible within a reasonable range to increase the friction along the way. Add a suitable orifice after the mass flow meter to ensure sufficient back pressure. This setting has been applied in foreign projects, but less in domestic projects. Placing a regulating valve after the flow meter is a common method of controlling back pressure. The regulating valve installed behind the flowmeter can ensure the full flow in the flowmeter through throttling of the valve body, and can ensure that the back pressure behind the flowmeter meets the requirements. For the on-site flow test of the distribution station and the terminal station, the opening of the regulating valve can be directly determined to ensure that there is no vaporization phenomenon under different working flow rates. The back pressure will affect the measurement accuracy of the mass flowmeter. For the easily vaporized medium, the back pressure may be low at the distribution station and the final station. Attention should be paid to the influence of the back pressure factor on the mass flowmeter. When the flowmeter is used, the reasonable selection of the flowmeter, the selection of the regulating valve and the opening control are used to ensure sufficient back pressure behind the flowmeter.
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