Level and Pressure Operating Instructions Capacitive electrodes EL Profibus PA
Safety information, Note Ex area Safety information Please read this manual carefully, and also take note of country-specific installation standards (e.g. the VDE regulations in Germany) as well as all prevailing safety regulations and accident prevention rules. For safety and warranty reasons, any internal work on the instruments, apart from that involved in normal installation and electrical connection, must be carried out only by qualified VEGA personnel.
Contents Contents Safety information ........................................................................ 2 Note Ex area ................................................................................ 2 1 Product description 1.1 Function and configuration .................................................. 4 1.2 Types and versions ............................................................. 5 1.3 Technical data ....................................................................... 7 1.4 Approvals ..
Product description 1 Product description 1.1 Function and configuration Capacitive electrodes series EL can detect the level of practically any kind of product, regardless of whether it is a liquid, powder or paste. This also applies to adhesive products. The electrode and the vessel wall are the capacitor surfaces. The medium is the dielectric. Due to the higher dielectric (DK value) of the medium with respect to air, the capacitance of the capacitor increases as the level rises around the electrode.
Product description 1.2 Types and versions Type EL 111) EL 211) EL 241) EL 29 Continuous • • • • Partly insulated • Version Fully insulated EL 311) EL 33 EL 421) EL 52 EL 53 • • • • • • • • • • • • • • • • • • • • PTB 98 ATEX 2086 • • • • PTB no. Ex 98.E.2085 • • • • • Overfill protection acc.
Product description Type EL 111) EL 211) PTFE • • PP • PE/PA 12 • Version EL 241) EL 29 EL 311) EL 33 EL 421) EL 52 • • • • EL 53 Insulating material 1) PFA • • FEP • PE • • Screening tube (option) Steel • • • • • • • • Stainless steel • • • • • • • • Steel • • • • Stainless steel (1.4435) • • • • PA • • • • Temperature adapter (option) • • • • Housing material Plastic • • • • • • • • • Aluminium • • • • • • • • • Misc.
Product description 1.3 Technical data Housing Housing material Protection - plastic housing - Aluminium housing Cable entry Terminals plastic PBT (Polyester) or Aluminium plastic-coated IP 66 IP 66 and 67 (meets requirements of both protection types) 1 piece M20 x 1.5 for max. 1.5 mm2 wire cross-section Mechanical connection Material Thread Flange galvanized steel (St 37), 1.
Product description Weights Basic weight (e.g. EL 24) Rod weight - ø 6 mm - ø 10 mm approx. 1.4 kg 0.23 kg/m 0.62 kg/m Connection cables Two-wire sensors Wire cross-section Ground connection Cable entry power supply and signal via one two-wire cable (the cable resistance depends on the supply voltage, see diagram) generally 2.5 mm 2 max. 4 mm2 2 x M20 x 1.
Product description Oscillator The oscillator CAP E34 PA Ex with patented processing (phase-selective admittance processing) extends the area of application of capacitive level measurement technology. This function can be switched on, see "4 Setup". If the moisture content goes above 15 % vol., the fully and partly insulated electrodes react differently (see illustration "Varying moisture content").
Product description Product temperature 1) and operating pressure 1) 1 bar 40 The numbers in the tables all relate to the graphs on this page. The stated pressures are valid for screw connections G 3/ 4 A, 3/ " NPT, G 1 A, 1" NPT. When using flanged 4 versions, make sure to note their nominal pressure. All electrodes are also suitable for applications in a vacuum (-1 bar). EL 21 up to 16 bar 16 0 -30 60 80 ˚C 2 bar 63 EL 42: up to 16 bar EL 24: from 100°C 6 bar, max. 150°C for 30 min.
Product description Electronics temperature Product and ambient temperatures must be kept within the following indicated ranges, so that the limit temperature on the electronics is not exceeded. The stated values are mandatory for applications in hazardous areas. For these applications, also note the respective official documents (test reports, test certificates, type approvals and conformity certificates).
Product description 1.4 Approvals Explosion protection Only certified capacitive electrodes EL** Ex 0 may be used in hazardous areas with combustible gases, vapours or fog. Capacitive electrodes EL** Ex 0 are suitable for use in hazardous areas of zone 1 and zone 0. Proof of the explosion protection provided by these instruments is the EC type approval and the conformity certificate, possibly with national zone 0 annex issued by the approval authority.
Product description 1.5 Dimensions Dimensions of capacitive electrodes type EL … Ex 0 Type EL 11 (partly insulated) 85 EL 21 (fully insulated) 32,5 85 Type EL 24 (fully insulated, for adhesive products) 32,5 M20x1,5 SW 60 35 20 35 20 35 20 SW 60 G 1½ A G 1½ A L (min. 120/max. 4000 mm) L (min. 100/max. 4000 mm) Ø 20 L1 M20x1,5 SW 60 G 1½ A L (min. 100/max. 4000 mm) 32,5 110 M20x1,5 110 110 85 A Ø 12 Ø 14 Ø 15 85 85 32,5 110 M20x1,5 M20x1,5 SW 60 35 G 1½ A L (min.
Product description Dimensions of the capacitive electrodes type EL … Ex 0 Type EL 42 (fully insulated) EL 52 (fully insulated) 85 32,5 32,5 110 110 85 32,5 110 85 Type EL 53 (fully insulated) M20x1,5 M20x1,5 M20x1,5 G 1½ A L (min. 400/max. 25.000 mm) ø6 120 120 200 ø 11 200 Ø3 Ø3 G 1½ A ø8 125 L (min. 400/max. 25.000 mm) Ø5 ø 15,5 200 L (min. 400/max. 25.
Product description Contents of the type plate (example) 1.6 Type plate Before mounting and electrical connection, please make sure you are using a suitable instrument. Note the type plate which is located as shown below. 1 2 2 3 4 VEGA® EL 11 type EK11EXO.XGBVSTXXVKXX see PTB Nr. EX-98.E.2085 EEx ia IIC T6 0032 PTB 98 ATEX 2086 II 1/2G EEx ia IIC T6 techn. data see document. / certificates 1998 protection: IP 66/67 Insp. ser. no. 10612892 length: 400mm VVO: 02 Ord. no.
Mounting 2 Mounting 2.1 Mounting instructions General Different mediums and measurement requirements make different installation positions necessary. Please note the following points. In such cases, use a rod electrode for short meas. distances, since a rod is usually more stable. If, due to the length or the installation position, a cable electrode is necessary, the electrode should not be fixed but simply provided with a gravity weight to allow the cable to more easily follow the product movements.
Mounting To avoid fraying the steel cable (EL 31) during cutting, you must tin the cable around the cutting position with a soldering iron or blowtorch, or tightly wrap the cable with a wire. Shorten the electrode cable with a metal cutting saw or a cutting-off wheel by the requested length. This is mainly valid for outdoor mounting, in areas where high humidity is expected (e.g. from cleaning processes) or for cooled or heated vessels. Carry out an adjustment. The instruction is under "4.1 Adjustment".
Mounting Non-conductive vessels In non-conductive vessels, e.g. plastic tanks, the second pole of the capacitor must be provided separately, e.g. in the form of a concentric tube. When using a standard instrument, a suitable grounding surface is necessary. Provide therefore the largest possible grounding surface, e.g. wire braiding laminated into the vessel wall or metal foil glued to the vessel. Connect the grounding surface to the ground terminal on the housing.
Mounting The measuring probe must be installed in a way that takes the filling and emptying apertures of the vessel into account. To compensate measurement errors caused by the conical heap, you should install the electrode at a distance of approx. d/ 6 from the vessel wall. Material cone When installing the meas. probe in a vessel, be aware that conical heaps which alter the switching point can form in solid materials.
Electrical connection 3 Electrical connection 3.1 Connection instructions Note Switch off the power supply before starting connection work. nection (cable types see chapter "1.3 Technical data"). The shielding must be connected on both ends (on the T-adapter and on the instrument). - For use in Ex areas, the installation regulations must be noted. Connect the supply voltage according to the following connection diagrams. 3.
Electrical connection Connection of the indicating instrument VEGADIS 50 Loosen the 4 screws of the housing lid on VEGADIS 50. To make wiring easier, we recommend fastening (with a screw) the cover to the side of the housing during connection work. Adjustment module Tank 1 m (d) 12.
Electrical connection Qualified personnel Instruments which are operated in Ex areas must only be connected by qualified personnel. They have to note the installation regulations and attached EC type approval certificates and conformity certificates. If the capacitive electrodes are to be mounted on vessels 0.8 which must be protected against ignition by lightning strokes (acc. to TRbF 100 no. 8, para. 1), they have to be equipped with the external overvoltage protection unit, type B62-30W.
Electrical connection Profibus PA in Ex environment For application in Ex areas, the PA bus and all connected instruments must be certified as intrinsically safe protective class "i". Fourwire instruments requiring a separate power supply must at least have an intrinsically safe PA connection. VEGA sensors for PA-Ex environment are always "ia two-wire instruments". In the so-called Fieldbus Intrinsically Safe Concept (FISCO), the general conditions for an Ex safe bus configuration have been laid down.
Electrical connection Electrical data of the cables RDC No. of A in cores mm 2 Z31.25kHz C in nF/km Damping Screen 44 Ω/km 2 0.75 100 Ω +/- 20 Ω < 90 < 3 dB/km 39 kHz Cu braiding SINEC L26XV1 44 Ω/km 830-35H10 (Siemens) 2 0.75 100 Ω +/- 20 Ω < 90 < 3 dB/km 39 kHz Cu braiding 2 0.32 150 Ω 29.
Electrical connection Overvoltage arresters for Ex systems B62-30 W can be used as overvoltage arrester in Ex systems. In Ex areas, overvoltage arresters must only be mounted in zone 1 or zone 2 (not in zone 0). You must differentiate between overvoltage protection of intrinsically and non-intrinsically safe circuits. For Ex systems, please note the installation conditions as well as the special prerequisites cited in the respective conformity certificates. B62-30 W: 9 … 36 V DC, max. 1 A e.g.
Electrical connection Connection example for the installation of an Ex system on vessels without cathodic corrosion protection The following overvoltage arrester can be used: - B62-30 W: 9 … 36 V DC, max.
Electrical connection Connection example for installation of an Ex system on vessels with cathodic corrosion protection The following overvoltage arrester can be used: - B62-30 W: 9 … 36 V DC, max.
Setup 4 Setup 4.1 Adjustment media All VEGA Profibus sensors operate in profile 3 and can be adjusted with: - the adjustment program VVO on a PC with Profibus card - VVO via VEGACONNECT 3 - the adjustment program PACTwareTM, under which VVO runs as a subprogram - the Siemens software PDM in conjunction with an EDD (Electronic Device Description) - the adjustment module MINICOM in the sensor.
Setup If all sensors are already connected to the bus cable, the address must be set via VEGACONNECT 3, the adjustment module MINICOM or via the mini coding switch. Example: To select address 37, set switch 1 (value 1), switch 3 (value 4) and switch 6 (value 32) to position "on". Set all other switches to position "off".
Setup 4.2 Adjustment with adjustment module MINICOM As with the PC, the sensor can also be adjusted with the small detachable adjustment module MINICOM. The adjustment module is inserted into the sensor or into the external indicating instrument (optional). Adjustment elements The adjustment module MINICOM is menudriven. The clear text indications on the display lead through the menu. The functions of the keys are described in the following. 3 2 1 - + + - Tank 1 Tank 1 m (d) 12.345 m (d) 12.
Setup Arrow keys (5) With the keys > and <, you can move within the menu level from one menu item to the other. Mode 1 = Standard (90°) The standard setting is recommended for unproblematic applications such as e.g. liquids with small DK values or with electrodes in conjunction with a concentric tube. Digital indication (1) On the digital indication, the actual measured value is displayed during operation. When you adjust the instrument, the clear text indication displays the appropriate function.
Setup Application: - highly conductive products - adhesive, conductive products - solids with fluctuating moisture content For use in conductive, viscous liquids, a suitable electrode of type EL 24 or EL 24 should be used. with conc. tube w.o conc. tube Mode 1 (90°) Mode 2 (PSA 45°) > 50 µS/cm > 100 µS/cm > 150 µS/cm > 300 µS/cm Adjustment in First of all, choose the unit you want to carry out the adjustment in. Possible are pF, m or ft. 2.
Setup Key Display Sensor m(d) 4.700 OK OK OK OK Parameter adjustment Adjustment with medium Min. adjust at % ------(Min. adjustment) 3. Conditioning Under the menu item "Signal conditioning" you can scale the display, set an integration time and choose a linearisation curve. Scaling Here, you can scale the digital display of the electrode. 0 % correspond Here, you enter the value which should be displayed when 0 % level is reached, e.g. 20 l.
Setup Menu schematic of the adjustment module MINICOM 1. Parameter Sensor optimize Mode 1 Configuration Add’l functions Info 1) Sensor Tag Sensor Tag Adjustment Electrode type No. 01 Sensor type CAP E34 Serial number Softw. vers. Sensor addr. 1) Adjustment in pF Lin. curve 0% corres ponds XXXX w.out medium Max. adjust at % XXX.X Offset correction pF Capacitance pF/m 3. Signal conditioning Scaling Min. adjust at % XXX.X Offset Sensor addr. 2. with medium max.
Setup Reset Total reset Reset to default Total reset Language English DK measurement Immersion 3) 3) OK? Reset to default OK Reset Now! 4. Outputs Simulation PA output prop. to Volume Sensor display Failure mode Error value Reset Now! OK ? DK meas. Now! OK? DK value (Er) 3) 3) OK ? Simulation Now! OK? Simulation in V% XXX.X prop. to Percent With these keys you move in the menu field to the left, to the right, top and bottom. ESC act. dist.
Setup 4.3 Adjustment with VVO VVO connection to the bus cable If the oscillator CAP E34 PA Ex is installed, the electrode can also be adjusted via a PC with the adjustment software VVO (from version 2.60). You need a Profibus DP interface card (from Softing) in your PC in order to adjust the sensor with the adjustment software VVO. This card must be used to make the connection between computer and Profibus DP cable (a direct connection or a connection to the Profibus PA cable is not possible).
Setup • Switch on the power supply of the connected sensor. • Start the adjustment software VVO (VEGA Visual Operating) on your PC. • In the entrance screen, you choose with the arrow keys or the mouse the item Planning and click to OK . You should only choose Planning if you are authorised to modify the instrument parameters. Otherwise choose Operator or Maintenance . In the window "User identification", you are asked for the name and the password.
Setup Under the menu item "Configuration", you can choose the following functions: • Measuring system • Measurement loop • Program The electrode is already preset at VEGA. The measuring system must only be configured if the oscillator is exchanged. Profibus PA address In this window, you can assign a bus address to the sensor in the field "Sensor address". This function is only available if the mini coding switch on the oscillator is set to >126.
Setup Configuration of measurement loops Click to Configuration, point to Measurement loop, then click to Modify. Measurement loop description In this field, you can give your measurement loop a descriptive label, e.g. level - cleaning detergent. Up to 80 characters can be entered. The measurement loop description is not saved in the sensor, but in the PC. Application For capacitive electrodes, Level measurement is permanently set and cannot be modified.
Setup Options In this function, program settings such as backup, etc., are available. Instrument data Display Diagnostics Instrument data Configuration Services Quit Help Parameter adjustment From the window "Instrument data parameter adjustment", you can reach all submenus of the sensor. Just test the various buttons one after the other. You will always return to this window. Click to the button Adjustment to carry out the adjustment.
Setup Note! Do not confuse this offset with the offset correction (Instrument data/Parameter adjustment/Additional functions). Under certain circumstances, an adjustment can also be carried out without medium with the help of the processing software VVO. The requirements for an adjustment in m are: Adjustment with medium Min. adjustment There must be min. level in the vessel. If you push the button Save , the output is set to the entered percentage value.
Setup If you have chosen pF, you can assign a corresponding value in Picofarad to the percentage value. Example 0 % = 97.2 pF 100 % = 1428.0 pF The values for the adjustment will be accepted by pushing the button OK.
Setup Push the button Transfer, to call up further linearisation curves. Click in the window "Conditioning" to Integration time. In the window "Linearisation", you can choose the linearisation curves of a horizontal cylindrical tank or a spherical tank. If you choose a user-programmable curve, you can then click to Edit and open the program "Tank Calculation". With this program, you can calculate the curves of different tank forms (see the manual "VEGA Visual Operating").
Setup Click in the window "Outputs" to Profibus output. Sensor parameter adjustment – Sensor optimisation In this window, the mode of the sensor can be set. With this, you modify the phase angle of the phase selective admittance processing (PSA). "Mode 1" is preset. In the window "Profibus output" you can determine the options for Profibus output (acc. to Profibus PA instrument profile). Confirm the settings with OK.
Setup Sensor parameter adjustment – Offset correction Confirm the question with OK, if the conditions are met. This function is necessary if an adjustment should be carried out in m. With this function, the initial capacitance is saved in the electronics. A prerequisite is that the electrode is installed in the vessel and completely unimmersed. An offset correction is only necessary if adjustment without medium is to be carried out.
Setup Diagnostics Display Diagnostics Instrument data Configuration Services Quit Help Status Simulation Under the menu item "Diagnostics" you can choose the following functions. • Status • Simulation Status This function is not available. Choose the requested measurement loop and click to OK. Simulation With this function, you can simulate a certain level. Push the start button to activate the simulation. Shift the scrollbar to the request PA output value or enter a specific PA output value.
Setup Select the requested measurement loop and click to OK. Under the menu item "Services", you can select the following functions: • Print • View • Backup • Restore configuration • Edit database • User level • Connection • Modem In the window "Simulation of outputs", you click to Start, to start the simulation. With the buttons "<–" and "–>" (or with the slide switch) you can set values between -10 % and 110 %. To quit the simulation, click to Stop.
Setup Operator This user level is for the operator. In this level, you can have the measured value displayed and the sensor data printed. There is no password required for this level. Maintenance If you select the level Maintenance, all functions are available except configuration. The password for this level is: VEGA. Planning If you select the level Planning, all functions are accessible. The passwords for the planning level are: VEGA - VEGA.
Diagnosis 5 Diagnostics 5.1 Simulation 5.3 Repair To simulate a certain filling level, you can call up the function Simulation in the oscillator or in the adjustment program VVO. You hereby simulate a certain PA output value. Remember that connected instruments, such as e.g. a PLC, react according to their settings and that alarms may be triggered or system functions activated. Repair work requires opening the instrument to correct defects.
Diagnosis 5.4 Failure rectification Failure Measure, failure rectification Sensor defective, measurement does Test the internal connections: • Loosen the 4 screws of the housing cover with a Phillips screwdriver and remove the housing cover. not react to level changes no display of measured values • Loosen the two small screws with a Phillips screwdriver and pull the oscillator out of the housing.
Diagnosis Failure Measure, failure rectification Contact 4 and vessel The connection between contact 4 and the metal vessel (not instrument hexagon or electrode flange) should be as good as possible. Measure with an ohmmeter (range very low) the resistance value between contact 4 and the vessel.
Notes Failure Measure, failure rectification Error message Adjustment span too small E017 Increase the span between empty and full adjustment. Error message General instrument error E034 PA status 12 Instrument error An error in the sensor was found. Possible causes are : - supply voltage not within tolerance - defective oscillator - damage to the electrode or to the insulation - electrode short-circuited against vessel wall • Separate the sensor from power supply and then reconnect (cold start).
Notes Capacitive electrodes EL - Profibus PA 53
Notes 54 Capacitive electrodes EL - Profibus PA
Notes Capacitive electrodes EL - Profibus PA 55
VEGA Grieshaber KG Am Hohenstein 113 D-77761 Schiltach Phone (07836) 50-0 Fax (07836) 50-201 E-Mail info@de.vega.com www.vega.com ISO 9001 All statements relating to scope of delivery, application, practical use and operating conditions of the sensors and processing systems correspond to the latest information at the time of printing. Technical data subject to alterations 2.
