Electromagnetic flowmeter EMKO E

Transcription

1 Electromagnetic flowmeter EMKO E - Quality design - High corrosion resistance - Reliable measurement principle Doc. no.: 70, en_cat_emkoe, 8/2015

2 Description Electromagnetic Flowmeter EMKO E consists of a sensor and transmitter. The whole system measures the volumetric flow rate by detecting the flow rate of conductive fluid that passes through the homogeneous magnetic field. The gauge is based on the principle of electromagnetic induction. It is designed to measure the flow of electrically conductive fluids. It is particularly useful where conventional mechanical gauges are not, due to the measuring principle is sufficiently reliable and accurate. Properties Magnetic flowmeter EMKO E is designed to measure the volumetric flow of any conductive fluid, without obstacles and obstructions in the flow profile. Wide choice of materials, execution of individual wetted parts makes it ideal for almost all possible applications - from highly corrosive, to a suspension containing fibers (eg. wood pulp) very hard to measure by other types of flowmeters. Flowmeter EMKO E allows to use a measurement that is independent of changes in density, pressure, temperature and viscosity of the measured medium. All flowmeters EMKO E are characterized by high accuracy, stability and repeatability. They are made for easier and cheaper use and maintenance. Fully interchangeable transducers and sensors simplify installation and do not require, as compared to standard devices on the market, a separate calibration devices, manual reset or periodic calibration. Principle Basic physical characterization instruments is based on Faraday's law of electromagnetic induction, the moving conductor in an electromagnetic field induces an electric voltage. E=Kbdv The induced voltage E is directly proportional to the speed V conductor, conductor width D and the magnetic field B. Coil generating the magnetic field are located on opposite sides of the tube. The medium passes through the tube at an average speed V and the electrodes sense the induced voltage. The width of the conductor is represented by a tube diameter of the flowmeter. Non-conductive lining inside of the tube prevents short circuits. The only variable is the speed of the medium V, because the geometry of the device and the magnetic field are constant. Therefore, the measured voltage E proportional to the speed of media. This value is further transferred to the electronic circuits for further processing. The tube flowmeter is installed in-line in the pipe (horizontal or vertical). Coils positioned on opposite sides of tube flowmeter generate the necessary magnetic field. Conductive fluid generates electrical voltage after passing through a magnetic field. The electric field is measured by two electrodes. The transmitter controls the coil so as to generate a homogeneous magnetic field. It also ensures all steps necessary to correctly measure and interpret electrical voltage to the measuring electrodes. The output from the transmitter is then directly proportional to the velocity of the liquid. 2 of 16

3 Tube Tube flowmeters from EMKO feature compact coils wide range of liners and electrode materials, different variants of grounding and protecting rings. Electromagnetic Flowmeter EMKO E uses pulsed DC excitation. This technology provides high performance and low power consumption. This option performs an automatic reset to compensate for changes in the conditions of the process itself. Accuracy ± 0.5% of measured value in the speed range of 0.3 to 10 m / s. It includes the effects of linearity, hysteresis, repeatability, and calibration uncertainty. Accuracy is ± m / s minimum measurement capabilities up to 0.3 m / s. (optional mean linear velocity of the medium 0.08 m / s). When demand for higher accuracy, eg % meter is supplied with a calming pipe. It is carried multipoint recalibration. Designing liner materials Curve of meter errors We offer a wide variety of material performance liners flowmeter for every application, teflon (PTFE), rubber, polypropylene. Lining Abrasion Chemical resistance Temperature Food industry PP bad good -30 C + 80 C yes RUBBER good little -20 C + 90 C no PTFE little great -30 C C yes Protecting rings Against damage necked lining sensor of solid particles can be used protecting rings which ensure minimizing violations of the lining when installing the flowmeter, in particular Teflon. When using a protecting ring is not necessary to provide other means earthing is already functional The protective rings are supplied on the basis of customer requirements. 3 of 16

4 Designing electrode materials EMKOMETER embodiment offers different material electrodes for different types of applications, e.g. material 17348, titanium, platinum, tantaliridium. Since the corrosion resistance of materials which are in current tables of chemical resistance, it may not correspond to the real resistance, drove this material is used as electrode flowmeter. On request it is possible to deliver a removable electrodes. In the case of precious linings of the flowmeter and the assumption of more frequent exchanges of electrodes, we recommend sensors with a removable cover. Media suitability The minimum required conductivity - 5μS / cm. Temperature, pressure, vacuum, chemical composition, impurities and their ability to adhere, abrasiveness must be in accordance with an embodiment of the sensor. Sensor Minimum conductivity of measured liquid Nominal pressure 5µS/cm Standard 1,6 MPa Special version 2,5 MPa Optional higher Protection IP 65 Standard 6m Length of connection cables Special version max. 25m Straight pipe lengths 5DN before and 3DN after the detector (see. picture Picture 1 Sensor process connection: using flanges according to DIN EN , ASME, DIN or according to other standards. Flowmeter in a sandwich version is inserted between the flanges. On request, the connection may be realized by a thread or sleeve. Connections may be made of e.g. carbon steel, stainless steel, plastic etc. 4 of 16

5 Version for food industry EMKO E model is available in a version for food purposes using Tri-Clover, TriClamp adapters. To prevent adhesion of the particles in the medium flowmeter is recommended to reduce the brightness to a smaller size (picture 2). Table. Temperature versus pressure limit of the flange Flanges according to ASME B16.5 (ANSI) Class: ½-inch to 24-inch pressure in psi Medium temperature C -28,9 až 37,8 C 66 C 85 C 93,3 C 149 C 177 C Flange Class 150 carbon steel Class 150 stainless steel Class 300 carbon steel Flanges according to DIN 2401, maximum pressure in bar Medium temperature C do 50 C 66 C 85 C 100 C 150 C 177 C Flange PN 10 carbon steel ,6 9 PN stainless steel 10 9,5 8,9 8,4 7,6 7,2 PN stainless steel 10 9,7 9,4 9,2 8,6 8,4 PN 16 carbon steel ,2 14,2 PN stainless steel 16 15,2 14,3 13,5 12,2 11,6 PN stainless steel 16 15,6 15,1 14,7 13,8 13,4 PN 25 carbon steel ,4 PN stainless steel 25 23,8 22,3 21,2 19,1 18,2 PN stainless steel 25 24,4 23,7 23,1 21,6 21 PN 40 carbon steel ,1 34,7 PN stainless steel 31,1 29,9 28,6 27,5 25,8 25,1 PN stainless steel ,8 36,9 34,6 33,6 Guidelines for fitting the sensor into the pipe. Straight sections before and after the meter. Electromagnetic flowmeters are generally less susceptible to change in the velocity profile of the medium than the other types of apparatus. To guarantee the accuracy of the published under varying operating conditions, it is necessary to install a flowmeter with a pipe, which is at least a straight stretch of five pipe diameters upstream of the device and a three pipe diameters downstream of the flowmeter (picture 1). These straight lengths calming pipes are usually sufficient for installation behind the knees, constrictions, etc. 5 of 16

6 Picture 2 Grounding tube For proper function of each flowmeter it is necessary to observe the principles of proper grounding. They vary depending on the material and conduction pipeline. If the flowmeter is joined to the conductive pipes connect earthing bolts of the flanges with connecting piping through wires or connections provide through lock washers under the head and nut fasteners, which connects the flow meter with the conduit (picture 3). If the flowmeter is installed to the pipes, where the medium is not in contact with the electrically conductive wall, e.g., plastic pipe or tubing contains stuffing. Then we use grounding rings that we put between the meter, gaskets and connecting pipes flanges. These grounding rings conductively connect with flanges and the body of the flowmeter. Another possibility of grounding media are grounding electrodes, which are normally inserted into the body of meter sensor Picture 3 Full sensor submersion by medium without venting Air in sensor causes inaccurate measurement unstable and therefore it is necessary to place the sensor in a horizontal or rising part of the branch pipe. Or place it in a siphon (picture 4). We recommend that even if the liquid is not flowing, the sensor is permanently flooded. Picture 4 6 of 16

7 Designing the size of the flowmeter Size of the flowmeter is one of the most important parameter because it affects the speed of the medium. The mean linear velocity in the pipe should match the subsequent table. You must choose a tube size that generates the optimum measurement conditions and the best possible results. Even outside these ranges the flow meter can measure with very good accuracy, please contact EMKOMETER. Table. Specifying the size of the flowmeter. Application Normal measurement 0,6 6,1 Abrasive suspensions 0,9 3,1 Non- abrasive suspensions 1,5 4,6 Speed range m/s The choice between compact and separate design sensor and transmitter. A separate version of the sensor and transmitter is chosen eg. if the installation location and its surroundings: Temperature is too low or too high (eg. due to the climate) Presence of vibrations Possibility of flooding, impact of weather Transmitter is equipped with a display, that would not be seen Compact design 7 of 16

8 Dimensions of the sensor and compact connected electronics For larger diameters on request Separate wall mounted electronics 8 of 16

9 Separate version - for explosive environments Vibrations effect Meets IEC 770. Mounting position effect No effect, if the tube is full. Sensor of the meter should be oriented so that the measuring electrodes are approximately horizontal. Position of measuring electrodes is at circular bodies marked on the housing body in split housings sensor electrodes are in the dividing plane of the cover. Paint Polyurethane, epoxy, acrylic. Response time to change of the flow 0.2 s from zero flow. Lower flow crop Adjustable in the range of to 0.3 m/s. Ambient humidity % RH at. 9 of 16

10 Permitted overload The output signal continues to the 110% flow rate, then remains constant. The transmitter shall submit a report to overload. Damping Adjustable between 0,2-256 s. Repeatability ± 0.1% of measured value. Effect of ambient temperature ± 0.25 % change over the entire temperature range of the transmitter. EMC compatibility Meets the specification requirements according to NAMUR recommendation: May 1993, chapter 1st Electromagnetic compatibility (EMC) for process and laboratory equipment. Potentially explosive atmospheres M / for safe area, CE. Table - ambient temperature and medium temperature Dimenze (mm) Max ambient temperature Max medium temperature C T až až až až až až až až 900 Transmitter 35 C 60 C 40 C 55 C 40 C 60 C 120 C 35 C 125 C 60 C 125 C 75 C 40 C 130 C 90 C 75 C 40 C 135 C 110 C 75 C 60 C 140 C 115 C 80 C Temperature class T3 T4 T3 T4 T3 T4 T5 T3 T4 T5 T6 T3 T4 T5 T6 T3 T4 T5 T6 Measured medium speed ranges 0,08 10 m/s Power 115 or 230 V AC ± 10%, Hz or 1030 V DC. Consumption 20 watts maximum. 10 of 16

11 Limit of ambient temperature transmitter -29 to 60 C with display. -34 to 66 C without display Storage -30 to 80 C Output signals 4-20 ma, internally or externally powered 5 to 24 VDC; 0 to 1000 ohms. Adjustable pulse output in the range 0 to 1000 Hz; external power supply 5 to 24 V DC. HART communication protocol is present on the analogue output. Digital Output Transistor switch up to 3 W, externally powered, 5AZ 24 VDC to indicate any of the following values: Reverse flow Zero flow shows zero flow in the device (for testing and warning systems) Damping Adjustable between 0.2 and 256S. Certification for use in potentially explosive atmospheres ± 0,1% from the measured values. Construction materials - cover Aluminum alloy, NEMA 4X a IEC 529 IP65. Pollution Degree 2. Gaskets cover - rubber Bushings M20 x 1,5 Control panel Pressing indicator LCD display Parametrická buttons Parametric buttons 11 of 16

12 Control panel - description EXIT, Left Arrow: Moves cursor to the previous screen. Starts counting when it is stopped, or stops it when it is working. Arrow Up: Moves cursor up on a highlighted item. Changes the parameter value according to predefined values. Down Arrow: Moves cursor one highlighted item down. Changes the parameter value according to predefined values. Right Arrow: The following specific value field display. Moves the cursor to the next item. Changing parameter values in a predefined sequence. Canceling the selected operation. Stop viewing the display totalizer (counter still counts). Reset after a stop totalizer. Display rotation: Each transmitter installation is different. Therefore, it is possible to change the orientation of the control panel display using the following procedure. 1. Disconnect the power supply. 2. Unscrew and remove the display cover. Never remove the display cover in explosive atmospheres when circuits are energized. 3. Remove the three screws attaching the panel to the body of the transmitter. 4. Carefully remove the control panel from the transmitter. 5. Remove the pin adapter from the back of the control panel 6. Insert the short end of the pin adapter connector J201. Make sure all the parts are properly plugged. 7. Turn the control panel to your desired position (90 ) and gently press the pin adapter to the control panel. NOTE: imprecision when inserting the pin adapter can cause irreversible damage. 8. Screw back three screws attaching the panel to the body of the transmitter. 9. Replace the plastic cover of the control panel. 10. Screw display cover. Inserting data: Keys control panel has no numeric keypad. If you want to put a numerical value, follow these steps: 1. Activate the function. 2. Use the right arrow to highlight the item you want to change. 3. Use the up or down arrows to change the desired item. For numerical entries arrow changes the value of the items in the order of 0-9, decimal dot, comma and space. For character items vary darts value items in the order AZ, digits 0-9 and the symbols &, +, -, *, /, and space. These darts are also used to changes according to predefined lists (some require direct input values). 4. Use the right arrow key to highlight and change characters (digits) that you want to change. 5. Press EXIT (left arrow) if it has the desired value displayed and you want to save the value. Example setting values: Setting of pipe size 1. Through the basic settings to activate the pipe size. 2. Press the cursor up and down, change the size of the pipe according to predefined values. 3. When the desired value displayed, press the left arrow to EXIT. 4. If necessary, switch the control loop to manual and then again left arrow EXIT. In a few moments the display shows the new value dimension flowmeter together with maximum flow. 12 of 16

13 Display Display Totalizer Display setup Flow rate display Totalize display Display lock Basic setup Detailed setup Transmitter test Units Tube size Tube cal. No. URV, LRV Damping End of list Lo-Flow cutoff Dig out config Special units Coil frequency Sig. Processing End of list Xmtr. Test Loop test Pulse test End of list URV configure LRV configure Dig out select Pulse output Aux output Signal processing control Signal processing samples Signal processing max% limit Signal processing time limit Transmitter trim Device information 4-20mA Trim Auto zero Gain trim Error messages Xmtr. Tag Xmtr. S/N Software rev. Description Messages Flowtube tag Flowtube S/N Liner material Electrode type Electrode material Flange type Flange material 13 of 16

14 Diagnostic messages and error messages Upon the occurrence of unforeseen events transmitter display one of these messages. Symptom Potential cause Recommended action Empty pipe Coil open ckt Autozero failure Nothing on dislay Display flashes, showing pointless characters Display panel does not respond to a keystroke Empty pipe Electrode error Conductivity is less than 5 microsiemens / cm Destroyed coils Destroyed electronics None, the message will be canceled if the pipe filled Test tube C and D (see. troubleshooting chapter) Improper use of the device. Measured medium must have conductivity Higher Than 5microsiemens / cm Check sensor coil. Test A (see. troubleshooting chapter) Replace electronics devices The flow rate was not zero when reseted Completely close the valve to prevent the flow and reset the sensor again Incorrect transmitter settings Set the transmitter correctly with HART communicator Control panel error Replace control panel Electronics error Replace electronics There is not enough display power Recharge the battery or replace electronics Replace control panel using HART transmitter to correct configure of the Control panel error device Electronics error Glass cover of control panel is dirty Replace electronics Clean the glass cover Troubleshooting Basic maintenance: problem of the transmitter is usually indicated by poor levels of output signal, error messages or low test scores. Always test all possibilities for finding a potential source of problems. Safety messages: instructions and procedures described in this section may require special demands on operator to comply with his personal security. Therefore, very well read these safety messages before beginning work.! Warning! Explosions could result in death or serious injury to life. Always check the specification of the outdoor environment and the sensor and transmitter.do not remove the cover under power transmitter in potentially explosive atmospheres Before connecting a HART communicator in an explosive atmosphere, make sure the device is connected intrinsically safe! Warning! Error in procedures can cause irreversible damage to equipment or injury to the worker. Never perform any servicing other than those specified in this manual. High voltage causes an electric shock. * Never touch parts under voltage terminal! Warning!! Warning! Poor handling of the appliance can lead to emission mřeného media, which can be toxic and cause serious damage to life or death and a serious environmental disaster. 14 of 16

15 Basic troubleshooting steps Symptom Potential cause Recommended action Output at 0 ma Output at 4 ma Transmitter is without power Incorrectly configured analog output Electronics error Transmitter is in multidrop mode Lower crop yield is too low The flow is in the opposite direction Short on reels Empty pipe Electronics error Check the function of power supply and connection Check the power switch Replace electronics devices Configure the device address to 0 and turn off the multidrop mode Increase the value of the crop or increase the flow rate through the gauge Enable the backflow Test coils (test A-B) Fill a piping Replace electronics devices Output at 21,6 ma Output at alarm Transmitter does not have correctly set range Transmitter has no power Transmitter has no power Reset the values of LRV and URV Check the setting of the size of the pipe that correspond with reality Turn off and then turn on the power. If the error still occurs, replace the transmitter electronic board Check the function of power supply and connection At non-zero flow pulse output is zero Bad wiring Backflow Pulse width is too big Electronics error 4-20mA loop configuration Check wiring and correct it Enable the backflow Reset pulse width Replace electronics devices Check the power switch (internal / external). HART 4-20 ma loop function Communication problems with HART Problem involving communication loop Weak battery handheld communicator HART Incorrect value of the total loop resistance (at least 250 ohm) Replace the battery of the handheld communicator Old version of the software communicator Contact the company EMKOMETER to update your communicator Error in the control panel or communicator Many possible causes Look at the list of error messages display and control panel 15 of 16

16 Control panel Control panel and its functions Key Key function Shift Moves the blinking cursor on the display one character right Switch between available values Increment Increases the character under the cursor one value Switches between numbers, letters and characters that can be used in the operation Switch between available values Enter Saves the displayed value selected in the previous step using the SHIFT and INCREMENT Display control keys Switches the counter and current flow Flow rate Totalize Start / Stop Read / Reset Displays user-defined parameters for the flow indication Displays current status of the transmitter counter and activates a group of keys, adds both forward and reverse flow or total flow Starts counter on the display, if it was stopped and stops the counter if it was running Resets the counter, if was stopped and runs the counter if it was running 16 of 16