Level and Pressure Operating Instructions Capacitive electrodes EK 4 … 20 mA - Compact
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.
Product description 1 Product description 1.1 Function and configuration Capacitive electrodes series EK 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.
Product description 1.2 Types and versions Type*) EK EK EK EK Version 11 21 24 26 Level detection 3) • • • • Continuous • • • Partly insulated • • • • Fully insulated Oscillators CAP E32 Ex • • • • CAP E32 H Ex • • • • Approvals ATEX II 1G, 1/2G EEx ia IIC T6 • • • • Overfill protection acc.
Product description Type*) EK 11 EK 21 • • • • Plastic (IP 66) • • • • Aluminium - plastic coated (IP 66 / 67) • • • • • • Version EK 24 EK 26 Screening tube (option) Stainless steel 1.4435 Temperature adapter (option) Stst (1.4435) max. 200°C • Housing material 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 Process fitting Material Thread Flange steel 1.4435 (316 L) G ¾ A or ¾ NPT G 1 A or 1 NPT flange versions, plated Electrode Material (rod) - EK 11 - EK 21 - EK 24 - EK 26 Length - rod Insulation 1.
Product description Oscillators CAP E32 Ex, CAP E32 H Ex Protection class Overvoltage category Frequency Capacitance ranges II III 300 KHz 0 … 3000 pF Power supply 12 … 36 V DC for Ex applications note the permissible electrical connection values stated in the certificate. USS ≤ 1 V min. 500 V DC Permissible residual ripple Potential separation Weight Load in Ohm 1000 800 600 200 Power supply in V 12 Basic weight (e.g. EK 24) Rod weight 18 24 30 36 approx. 0.8 kg ø 6 mm - 0.
Product description Oscillator The oscillator CAP E32 (H) 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. the fully and partly insulated electrodes react differently (see also „Fig. 1.3 Varying moisture content“).
Product description Product temperature1) and operating pressure1) 16 0 -30 Electrode type PTFE FEP EK 11 1 3 - EK 21 1 3 - EK 21 with flange - 2 - EK 24 - - 2 EK 26 1 3 - 60 80 ˚C 2 bar 63 40 16 0 -50 PE Insulation EK 21: up to 16 bar 40 100 ˚C EK 42: up to 16 bar EK 24: from 100°C 6 bar, max. 150°C for 30 min.
Product description Electronics temperature Product and ambient temperatures must be kept at levels that do not exceed the limit temperature of the electronics.
Product description 1.4 Approvals Ship approvals Explosion protection For use on ships, type approval certificates are available from several ship classification authorities (GL, LRS, ABS, BV, RINA). Only certified capacitive electrodes EK** Ex 0 may be used in hazardous areas with combustible gases, vapours or fog. Capacitive electrodes EK** Ex 0 are suitable for use in hazardous areas of zone 1 and zone 0.
Product description 1.5 Dimensions Dimensions of capacitive electrodes type EK … Ex 0 EK 11 with concentric tube Type EK 11 (partly insulated) 85 32,5 32,5 85 90 90 90 85 Type EK 21 (fully insulated) 32,5 M20x1,5 M20x1,5 20 20 G ¾ A or G 1A SW 41 G ¾ A or G 1A 50 G ¾ A or G 1A 35 SW 41 SW 41 20 35 35 M20x1,5 L L L A B A ø21,3 L (min. 100 mm, max. 3000 mm) L (min. 100 mm, max.
Product description Housing 32,5 90 85 M20x1,5 Housing of plastic / Aluminium Temperature adapter 133 SW 41 20 SW 41 G 3/4 A or G1 A of 1.4435 Concentric tube Screening tube SW 60 L (min. 100/max. 4000 mm) of 1.4435 L (min. 75/max. 2000 mm) SW 60 of 1.4435 with closing cone of PTFE (Lmax.
Product description 1.6 Type plate Contents of the type plate (example) 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 VEGA® EK 11 2 3 Type plate 4 type EK11EXO.XGBVSTXXVKXX 9 see PTB Nr. EX-98.E.2085 EEx ia IIC T6 0032 II 1/2G EEx ia IIC T6 PTB 98 ATEX 2086 8 techn. data see document. / certificates 1998 protection: IP 66/67 Insp. length: 400mm VVO: 02 ser. no. 10612892 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. Lateral load Make sure that the electrode is not subjected to strong lateral forces. Mount the electrode in a position in the vessel where no disturbing factors, e.g. stirrers, filling openings etc. are present. This is especially important for very long rod and cable electrodes.
Mounting Fig. 2.3 Moisture Cable entries Fig. 2.2 Shortening the electrode Filling opening Install the electrode such that it does not protrude directly into a strong filling stream. Should such an installation location be necessary, mount a suitable protective sheet in front of the electrode, e.g. L 80 x 8 DIN 1028, etc.
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 electrode, 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. Fig. 2.
Mounting Material cone When installing the measuring probe in a vessel, be aware that conical heaps which alter the switching point can form in solid material. We recommend choosing an installation location that enables the electrode to detect the average value of the conical heap.
Electrical connection 3 Electrical connection 3.2 Wiring plan 3.1 Connection instructions Note The oscillator is independent of the electrode and can be exchanged on site. Note Switch off the power supply before starting connection work. + Connect the supply voltage according to the following connection diagrams. 4 … 20 mA – A multimeter can be connected to terminals 3 and 4 for setup. This connection is not suitable for an indicating instrument.
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 the attached EC type approval certificates and conformity certificates. If the capacitive electrodes are to be mounted on vessels which must be protected against the danger of ignition by lightning (acc. to TRbF 100 no. 8, para.
Overvoltage protection unit mounted to oscillator Oscillator Non (Ex) area (Ex) area Zone1 CB 2-36 2 1 Li, Ci of the oscillator with overvoltage protection unit Li = 0.27 mH Ci = 8.5 nF Schirm External ground terminal CAP E32(H)EX Control room optionally: Overvoltage protection insert Type B62-36G Vessel Zone 0 E2 E1 Internal ground terminal Li=0.15 mH Ci=2.
22574-EN-020809 Overvoltage protection unit mounted on oscillator CB 2-36 2 1 Li, Ci of the oscillator with overvoltage protection unit Li = 0.27 mH Ci = 8.5 nF CAP E32(H)EX Oscillator External ground terminal Control room optionally: Overvoltage protection insert Screen Typ B62-36G Internal ground terminal Vessel Zone 0 E2 E1 to the potential equalisation line Li=0.15 mH Ci=2.
Setup 4 Setup 4.1 General adjustment In the setup procedure, the electrode must be adjusted to the medium which will later be measured. In certain cases, a dry adjustment is also possible. The electrode can be adjusted in three different ways: • with the integrated oscillator • with the adjustment software VEGA Visual Operating (VVO from version 2.30) • with a HART® handheld CAP E 32 Ex Adjustment - directly on the oscillator.
Setup 4.2 Adjustment - Oscillators CAP E32 Ex and CAP E32 H Ex 2 1 8 1 2 3 4 1 Minus key 2 Rotary switch 3 Plus key 0 6 - 3 2 4 + + - + 1 2 3 4 mA U = 12 … 36 V Rotary switch (2) With the rotary switch (10 steps) you select the appropriate mode. As soon as you continue turning the rotary switch, the modified value will be saved. 0 1 2 3 4 5 6 7 8 9 Operate Min. adjustment Max.
Setup If you want to assign a certain current value to a known level, you can modify the current with the plus and minus keys. Each push of the key changes the current value by a 10 µA increment. If you hold the key pushed, the values changes with rising speed. Example: If you know that your vessel is filled up to 90 % and will be completely full at 100 %, then you can enter under max. adjustment a value of 18.4 mA. 20 mA - 4 mA = 16 mA 16 mA * 90% = 14.4 mA 14.4 mA + 4 mA = 18.
Setup Mode 2 = Phase angle 45° The capacitance and the ohmic conductance are measured separately, the capacitance value is corrected by calculating it with the ohmic conductance, so that measurement errors caused by conductive buildup or varying product moisture are compensated. Application: - highly conductive products - adhesive, conductive products - solids with fluctuating moisture content For applications in conductive, viscous liquids, you should use a suitable electrode of type EK 24.
Setup 4.3 Adjustment with VVO If oscillator CAP E 32 H Ex is installed, the electrode can also be adjusted via a PC with adjustment software VVO (from version 2.30). + - + - PC mit VVO 1 2 3 4 VEGACONNECT 2 mA approx. 250 Ohm Note If the resistance of the supply voltage is less than 250 Ohm, a resistance must be connected to the signal/connection cable during adjustment. The digital adjustment and communication signals would otherwise be shortcircuited by insufficient resistance, e.g.
Setup 4.4 Adjustment with HART® handheld Burst mode The capacitive electrodes EK with oscillator CAP E32 H Ex are HART® protocol capable and can be adjusted with a HART® handheld. HART® handheld + - + 1 2 3 4 mA 250 Ohm All relevant sensor functions can be executed with the HART® standard menus. A manufacturer-specific DDD (Data-Device-Description) is not necessary. Connect the HART® handheld to the sensor signal cable after you have connected the sensor to power supply.
Setup PLC with Ri < 250 Ohm + PLC 250 – Ri < 250 Fig. 1 PLC with Ri > 250 Ohm + PLC – Ri > 250 Fig. 2 VEGAMET signal conditioning instruments or VEGALOG VEGAMET VEGALOG + 250 Ohm Fig.
Setup Adjustment steps On the following pages you will see the menu schematic of the HART® handheld in conjunction with capacitive electrodes. The most important adjustment steps are marked in the menu schematic with the letters A … D. In a further safety enquiry you are asked to switch the system from manual to automatic operation. Confirm with „OK“. Generic: SENSOR - WARNINGReturn control loop to automatic control.
Setup HART® menu schematic Hart Communicator Self Test in Progress Firmware Rev: F2.2 Module Rev: 3.6 01992-96 FRSI after approx. 20 s Generic: Sensor Online(Generic) 1 Device setup 2 PV 3 PV AO 4 PV LRV 5 URV HELP SAVE Set-up the sensor in the sequence of the figures A, B, C and D (adjustment without medium). In case of adjustment with medium, set-up the sensor in the sequence A1, B1, C and D.
Setup 1.1.1 Generic: Sensor PV 0,2 m Confirm safety enquiry HELP EXIT 1.1.2 Generic: Sensor PV % rnge 8.945 % 1.2.2 Generic: Sensor Choose analog output level Individual current values for 1 4 mA test purposes (simulation of 2 20 mA measured values) 3 Other 4 End ABORT ENTER 1.2.3 Generic: Sensor Empty and full Calibration adjustment 1 Apply values with medium 2 Enter values (see next page) A1 B1 } HELP HELP EXIT 1.1.3 Generic: Sensor AO1 5.
Setup HART® menu schematic (continuation) Empty adjustment with medium 1.2.3.1 1.2.3 Generic: Sensor Calibration 1 Apply values 2 Enter values 1.2.3.1 Confirm safety enquiry Generic: Sensor Set the: 1 4 mA 2 20 mA 3 Exit A1 Generic: Sensor Apply new 4 mA input ABORT OK ABORTENTER HELP SAVE HOME 1.2.3.2 Generic: Sensor Enter values 1 PV LRV 2 URV 3 PV USL 4 PV LSL HELP B1 Generic: Sensor Apply new 20 mA input as display 4.1 as display 4.2 Indication of sensor meas. range limits } ABBR.
Setup 1.2.3.1.1.1 1.2.3.1.1 Generic: Sensor Generic: Sensor Current applied Set the: process value: 10.945 1 4 mA mbar 2 20 mA 1 Set as 4 mA value 3 EXIT 2 Read new value 3 Leave as found ABORT ENTER ABORT ENTER Generic: Sensor Current applied prosess value :85.281 mbar 1 Set as 20 mA value 2 Read new value 3 Leave as found ABORT ENTER 1.2.3.1.2 Generic: Sensor Set the: 1 4 mA 2 20 mA 3 Exit ABORT ENTER 1.2.3.1.2.1 1.4.3.1.
Diagnosis 5 Diagnosis 5.1 Simulation To simulate a certain filling level, you can call up the function “Simulation” in the oscillator, in the adjustment program VVO or in the HART® handheld. You hereby simulate a certain current. 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. 5.2 Maintenance The instrument is maintenance-free. 5.
Diagnosis 5.4 Fault rectification Fault Rectifying measure Current value ≥ 22 mA Check the sensor inputs for the following causes of faults: - short-circuit on the input - sensor not connected correctly - sensor cable interrupted - supply voltage too low or too high Measure the current on the connection cable to the sensor. Under normal conditions, the terminal voltage of the sensor is at least 12 V. 4 … 20 mA mA 1212 …… 2036 V mA V 28 + 30 – 32 Sensor + + – – e.g.
Diagnosis Fault Rectifying measure Sensor defective, Measurement does react to level changes Test the internal connections: • Loosen the 4 screws of the housing cover with a Phillips screwdriver and remove the housing cover. • Loosen the two small screws with a Phillips screwdriver and pull the oscillator out of the housing.
Diagnosis 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. • Short-circuit (0 … 3 Ohm), optimum connection • Resistance > 3 Ohm - corrosion on the mounting thread or flange - possibly the mounting thread was covered with Teflon tape or a similar material Check the connection to the vessel.
VEGA Grieshaber KG Am Hohenstein 113 77761 Schiltach Germany 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.
