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Vega VEGADIF 85 Operating Instructions Manual

Differential pressure transmitter with metallic measuring diaphragm
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Operating Instructions
Differential pressure transmitter with
metallic measuring diaphragm
VEGADIF 85
Modbus and Levelmaster protocol
Document ID: 53571

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Summary of Contents for Vega VEGADIF 85

  • Page 1 Operating Instructions Differential pressure transmitter with metallic measuring diaphragm VEGADIF 85 Modbus and Levelmaster protocol Document ID: 53571...

  • Page 2: Table Of Contents

    Set instrument address ....................55 Save parameter adjustment data..................56 Set up measuring system ..................... 57 Level measurement ......................57 Flow measurement ......................59 Diagnosis, asset management and service ................ 61 Maintenance ........................61 VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 3 11.10 Industrial property rights ....................93 11.11 Trademark ........................93 Safety instructions for Ex areas: Take note of the Ex specific safety instructions for Ex applications. These instructions are attached as documents to each instrument with Ex approval and are part of the operating instructions. Editing status: 2023-08-04 VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 4: About This Document

    Symbols used Document ID This symbol on the front page of this instruction refers to the Docu- ment ID. By entering the Document ID on www.vega.com you will reach the document download. Information, note, tip: This symbol indicates helpful additional infor- mation and tips for successful work.

  • Page 5: For Your Safety

    To avoid any danger, the safety approval markings and safety tips on the device must also be observed. Conformity The device complies with the legal requirements of the applicable country-specific directives or technical regulations. We confirm con- formity with the corresponding labelling. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 6: Namur Recommendations

    That is why we have introduced an environment management system with the goal of continuously improving company environmental pro- tection. The environment management system is certified according to DIN EN ISO 14001. Please help us fulfil this obligation by observing the environmental instructions in this manual: • Chapter " Packaging, transport and storage" • Chapter " Disposal" VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 7: Product Description

    • Move to " www.vega.com" and enter in the search field the serial number of your instrument. • Scan the QR code on the type label. • Open the VEGA Tools app and enter the serial number under " Documentation". VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 8: Principle Of Operation

    Fig. 1: Level measurement with VEGADIF 85 in a pressurized vessel Flow measurement The flow measurement is carried out via an effective pressure trans- mitter, such as an orifice plate or pitot tube. The device records the resulting pressure difference and converts the measured value into the flow. With digital signal outputs, the static pressure is available as a separate measured value. – Fig. 2: Flow measurement with VEGADIF 85 and orifice, Q = flow, differential pressure Δp = p VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 9 Differential pressure The pressures in two different pipelines are acquired via effective measurement pressure lines. The device determines the differential pressure. Fig. 3: Measurement of the differential pressure in pipelines with VEGADIF 85, differential pressure Δp = p Density measurement With the help of the instrument, density measurement in a vessel with changing level and homogeneous density distribution can be easily realized.

  • Page 10: Supplementary Cleaning Procedures

    Differential pressure sensor Separating diaphragm Supplementary cleaning procedures The VEGADIF 85 is also available in the version " Oil, grease and silicone-free". These instruments have passed through a special cleaning procedure to remove oil, grease and paint-wetting impair- ment substances (PWIS).

  • Page 11: Packaging, Transport And Storage

    The integrated Bluetooth module (optional) enables wireless adjust- ment via standard adjustment devices. The interface adapter VEGACONNECT enables the connection of VEGACONNECT communication-capable instruments to the USB interface of a PC. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 12 Mounting accessories The suitable mounting accessories for VEGADIF 85 include oval flange adapters, valve blocks as well as mounting brackets. Chemical seal Through the use of chemical seals, VEGADIF 85 can also be used for corrosive, highly viscous or hot media. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 13: Mounting

    This applies mainly to outdoor installations, in areas where high humidity is expected (e.g. through cleaning processes) and on cooled or heated vessels. Note: Make sure that during installation or maintenance no moisture or dirt can get inside the instrument. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 14 Higher process temperatures often mean also higher ambient temperatures. Make sure that the upper temperature limits stated in chapter " Technical data" for the environment of the electronics hous- ing and connection cable are not exceeded. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 15: Instructions For Oxygen Applications

    Therefore, suitable venting systems must be provided for liquids and suitable drainage systems for gases. Wiring Effective pressure lines must always run with a sufficient, strictly mo- notonous slope/gradient of at least 2 %, but better up to 10 %. Recommendations for wiring of effective pressure lines are stated in the corresponding national and international standards. Connection Effective pressure lines are connected to the device via standard cut- ting ring screw connections with suitable thread. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 16: Mounting And Connection Instructions

    Use the supplied parts and seal the thread with four layers of PTFE tape. Mounting and connection instructions Connection high/low When connecting VEGADIF 85 to the measuring point, take note of pressure side the high/low pressure side of the process component. The " H" identifies the high pressure side, the low pressure side due to an " L" on the process component next to the oval flanges.
  • Page 17 Inlet valve Inlet valve Breather valve 3-fold valve block, flang- ing on both sides Fig. 10: Connection of a 3-fold valve block, flanging on both sides Process fitting Process fitting Inlet valve Inlet valve Breather valve VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 18: Measurement Setups

    Flow • Differential pressure • Interface • Density Depending on the application, there may also be different arrange- ments. Note: For simplification, the effective pressure lines are partly shown with a horizontal course and sharp angles. For wiring, please observe the instructions in chapter " Mounting, Connection to the process" as well VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 19 • For measurement in products with solid content, such as e.g. dirty liquids, the installation of separators and drain valves is recom- mended. Debris and sediment can thus be collected and removed. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 20 • For measurement in products with solid content, such as e.g. dirty liquids, the installation of separators and drain valves is recom- mended. Debris and sediment can thus be collected and removed. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 21 In gases Fig. 16: Measurement setup with flow measurement of gases, connection via 3-fold valve block, flanging on both sides Orifice or impact pressure probe 3-fold valve block, flanging on both sides VEGADIF 85 VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 22 For measurements in products with solid content such as e.g. dirty liquids, the installation of separators and drain valves is recom- mended to enable collection and removal of debris and sediment. • Fill the effective pressure lines to the height of the condensate vessels before setup VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 23 Fig. 19: Measurement setup with differential pressure measurement between two pipelines in gases and vapours Pipelines Blocking valves 3-fold valve block VEGADIF 85 • In vapour and conden- Mount device below the measurement loop so that some conden- sate plants sate can collect in the effective pressure lines. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 24 Blocking valves 3-fold valve block Precipitator Drain valves VEGADIF 85 • Mount chemical seal with capillaries on top or laterally on the When chemical seal systems are used in all pipeline products VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 25 4 Mounting • In vacuum applications: Mount VEGADIF 85 below the measure- ment loop • The ambient temperature should be the same for both capillaries – Fig. 22: Measurement setup, differential pressure measurement in gases, vapours and liquids Chemical seal with slotted nut Capillaries E.g.
  • Page 26 800 kg/m³, max. density 1000 kg/m³ Carry out min. adjustment for the differential pressure which is meas- ured at the height of the interface on the lower measurement point: Δp = ρ • g • h = 800 kg/m³ • 9.81 m/s • 0.3 m = 2354 Pa = 23.54 mbar Carry out max. adjustment for the differential pressure which is meas- ured at the height of the interface on the upper measurement point: Δp = ρ • g • h = 1000 kg/m³ • 9.81 m/s • 0.3 m = 2943 Pa = 29.43 mbar VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 27: Connecting To Power Supply And Bus System

    In the case of instrument housings with self-sealing NPT threads, it is not possible to have the cable entries screwed in at the factory. The free openings for the cable glands are therefore covered with red dust protection caps as transport protection. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 28: Connecting

    3. Remove approx. 10 cm (4 in) of the cable mantle (signal output), strip approx. 1 cm (0.4 in) insulation from the ends of the indi- vidual wires 4. Insert the cable into the sensor through the cable entry VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 29 The terminal blocks are pluggable and can be removed from the housing insert. To do this, lift the terminal block with a small screwdriv- er and pull it out. When inserting the terminal block again, you should hear it snap in. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 30: Wiring Plan

    For display and adjustment module or interface adapter Connection compartment MODBUS power supply off on Fig. 28: Connection compartment USB interface Slide switch for integrated termination resistor (120 Ω) Modbus signal Voltage supply Terminal Function Polarity Voltage supply VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 31: External Housing With Version Ip68 (25 Bar)

    External housing with version IP68 (25 bar) Electronics and connec- tion compartment for power supply 4...20mA 6 7 8 Fig. 29: Electronics and connection compartment Electronics module Cable gland for voltage supply Cable gland for connection cable, transmitter VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 32 Fig. 31: Connection compartment USB interface Slide switch for integrated termination resistor (120 Ω) Modbus signal Voltage supply Terminal Function Polarity Voltage supply Voltage supply Modbus signal D0 Modbus signal D1 VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 33: Switch-On Phase

    Indication of a status message on the display or PC Then the actual measured value is output to the signal cable. The value takes into account settings that have already been carried out, e.g. default setting. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 34: Set Up The Sensor With The Display And Adjustment Module

    The display and adjustment module is powered by the sensor, an ad- ditional connection is not necessary. Fig. 32: Insertion of the display and adjustment module Note: If you intend to retrofit the instrument with a display and adjustment module for continuous measured value indication, a higher lid with an inspection glass is required. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 35: Adjustment System

    The pen oper- ates the four keys of the display and adjustment module right through the closed lid (with inspection window) of the sensor housing. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 36: Measured Value Indication

    With the " OK" key you move (during the initial setup of the instru- ment) to the selection menu " Language". Selection language In this menu item, you can select the national language for further parameterization. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 37: Parameter Adjustment - Quick Setup

    For technically demanding measuring points, you can carry out extended settings in " Extended adjustment". Main menu The main menu is divided into five sections with the following func- tions: Setup: Settings e. g. for measurement loop name, application, units, position correction, adjustment, signal output, disable/enable opera- tion Display: Settings, e.g., for language, measured value display, lighting VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 38 Unit of measurement: In this menu item, the adjustment units of the instrument are deter- mined. The selection determines the unit displayed in the menu items " Min. adjustment (Zero)" and " Max. adjustment (Span)". VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 39 The installation position of the instrument can shift the measured value (offset). The position correction function compensates this offset. In the process the current measured value can be accepted automatically. VEGADIF 85 has two separate sensor systems: one sensor for dif- ferential pressure and one sensor for static pressure. The following possibilities thus result for position correction: •...
  • Page 40 The position correction can be repeated any number of times. Adjustment VEGADIF 85 always measures pressure independently of the process variable selected in the menu item " Application". To output the se- lected process variable correctly, an allocation of the output signal to 0 % and 100 % must be carried out (adjustment).
  • Page 41 Max. adjustment - Level Proceed as follows: 1. Select with [->] the menu item Max. adjustment and confirm with [OK]. 2. Edit the percentage value with [OK] and set the cursor to the requested position with [->]. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 42 3. Set the requested mbar value with [+] and store with [OK]. The max. adjustment is finished. For an adjustment with pressure, simply enter the actual measured value indicated at the bottom of the display. Zero adjustment differen- Proceed as follows: tial pressure VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 43 [OK]. Edit the sensor distance with [OK] and set the cursor to the requested position with [->]. Set the distance with [+] and save with [OK]. The adjustment of the distance is hence finished. Min. adjustment density Proceed as follows: VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 44 2. Edit the sensor distance with [OK] and set the cursor to the requested position with [->]. 3. Set the distance with [+] and save with [OK]. The adjustment of the distance is hence finished. Min. adjustment interface Proceed as follows: VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 45 A linearization is necessary for all applications in which the measured process variable does not increase linearly with the measured value. This applies for example to the flow measured via the differential pressure or the vessel volume measured via the level. Correspond- ing linearization curves are preprogrammed for such cases. They VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 46 6.5.2 Display Language This menu item enables the setting of the requested national lan- guage. The device assumes an approximately constant temperature and static pressure and calculates the flow rate from the measured differential pressure using the characteristic curve extracted by root. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 47 Polish • Czech • Turkish In delivery status, the VEGADIF 85 is set to English. Display value 1 and 2 - In this menu item, you define which measured value is displayed. 4 … 20 mA The default setting for the displayed value is " Differential pressure". Display format 1 and 2 In this menu item you define the number of decimal positions with which the measured value is displayed.
  • Page 48 To deactivate the simulation, you have to push the [ESC] key and confirm the message " Deactivate simulation" with the [OK] key. Caution: During simulation, the simulated value is output as digital signal. The status message along with the Asset Management function is " Maintenance". VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 49 Application Application Level Units Unit of measurement mbar (with nominal measuring range ≤ 400 mbar) bar (with nominal measuring ranges ≥ 1 bar) Temperature unit °C Position correction 0.00 bar Adjustment Zero/Min. adjustment 0.00 bar 0.00 % Span/Max. adjustment Nominal measuring range in bar 100.00 % Damping Integration time VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 50 Write into sensor: Store data from the display and adjustment module back into the sensor The following data or settings for adjustment of the display and ad- justment module are saved: • All data of the menu " Setup" and " Display" VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 51 0 % and 100 %. Characteristics values DP In this menu item, the units for the DP flow element are determined flow element and the selection of mass or volume flow is carried out. Furthermore the adjustment for the volume or mass flow at 0 % or 100 % is carried out. The device automatically adds the flow in the selected unit. With appropriate adjustment and bidirectional linearization, the flow rate is counted both positively and negatively. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 52 PC. Sensor characteristics In this menu item, the features of the sensor such as approval, pro- cess fitting, seal, measuring range, electronics, housing and others are displayed. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 53: Setting Up Sensor And Modbus Interface With Pactware

    Fig. 38: Connecting the PC via USB to the Modbus electronics USB cable to the PC To the RS 485 cable Connection of the PC to the RS 485 cable is carried out via a stand- ard interface adapter RS 485/USB. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 54: Parameterization

    Further setup steps are described in the operating instructions manu- al " DTM Collection/PACTware" attached to each DTM Collection and which can also be downloaded from the Internet. Detailed descrip- tions are available in the online help of PACTware and the DTMs. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 55: Set Instrument Address

    " Software". The full version is avail- able on CD from the agency serving you. Set instrument address The VEGADIF 85 requires an address for participating as a sensor in the Modbus communication. The addess setting is carried out via a PC with PACTware/DTM or Modbus RTU.

  • Page 56: Save Parameter Adjustment Data

    The procedure depends on the respective Modbus-RTU and the configuration tool. Save parameter adjustment data We recommend documenting or saving the parameterisation data via PACTware. That way the data are available for multiple use or service purposes. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 57: Set Up Measuring System

    III Precipitator 1, 5 Drain valves 2, 4 Inlet valves Breather valve 6, 7 Vent valves on VEGADIF 85 A, B Blocking valves Proceed as follows: 1. Fill the vessel to just above the lower tap 2. Fill measuring system with medium...
  • Page 58 IV Condensate vessel 1, 5 Drain valves 2, 4 Inlet valves Breather valve 6, 7 Vent valves on VEGADIF 85 A, B Blocking valves Proceed as follows: 1. Fill the vessel to just above the lower tap 2. Fill measuring system with medium...

  • Page 59: Flow Measurement

    Fig. 43: Prefered measurement setup for gases, connection via 3-fold valve block, flanging on both sides VEGADIF 85 3-fold valve block 2, 4 Inlet valves Breather valve 6, 7 Vent valves on VEGADIF 85 Liquids – Fig. 44: Preferred measurement setup for liquids VEGADIF 85 3-fold valve block...
  • Page 60 Now: Valves 1, 3, 5, 6 and 7 are closed Valves 2 and 4 are open Valves A and B open 6. Carry out position correction, if flow can be blocked. In this case, step 5 is not required. Arrangement with 5 valves. Valves 1, 3, 5: Configuration with 5 valves. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 61: Diagnosis, Asset Management And Service

    The requested values and recording conditions are set via a PC with PACTware/DTM or the control system with EDD. Data are thus read out and also reset. Event memory Up to 500 events are automatically stored with a time stamp in the sensor (non-deletable). Each entry contains date/time, event type, event description and value. Event types are for example: VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 62: Asset Management Function

    The instrument is being worked on, the measured value is temporarily invalid (for example during simulation). This status message is inactive by default. Out of specification: The measured value is unreliable because an instrument specification was exceeded (e.g. electronics temperature). This status message is inactive by default. Maintenance required: Due to external influences, the instrument function is limited. The measurement is affected, but the measured value is still valid. Plan in VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 63 Send instrument for repair Error in the EEPROM F261 Error during setup Repeat setup Byte 4, Bit 1 of Byte 0 … 5 Error in the instrument Error when carrying out a reset Repeat reset settings VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 64 M501 Index markers are not continu- Check linearization table Bit 1 of ously rising, for example illogical Byte 14 … 24 Error in the non-active Delete table/Create new value pairs linearisation table VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 65: Rectify Faults

    24 hour service hotline Should these measures not be successful, please call in urgent cases the VEGA service hotline under the phone no. +49 1805 858550. The hotline is also available outside normal working hours, seven days a week around the clock.

  • Page 66: Exchange Process Module On Version Ip68 (25 Bar)

    Hexagon key wrench, size 2 Caution: The exchange may only be carried out in the complete absence of line voltage. In Ex applications, only a replacement part with appropriate Ex ap- proval may be used. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 67: Exchanging The Electronics Module

    Proceed as follows when carrying out the exchange: 1. Losen the fixing screw with the hexagon key wrench 2. Carefully detach the cable assembly from the process module Fig. 46: VEGADIF 85 in IP68 version, 25 bar and lateral cable outlet, external housing Process module Plug connector...

  • Page 68: Software Update

    Details of the medium Print the generated instrument return form. Clean the instrument and pack it damage-proof. Send the printed instrument return form and possibly a safety data sheet together with the device. You will find the address for the return on the generated instrument return form. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 69: Dismount

    If personal data is stored on the old device to be disposed of, delete it before disposal. If you have no way to dispose of the old instrument properly, please contact us concerning return and disposal. VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 70: Supplement

    PN 160 and PN 400: hexagon screw DIN 931 M8 x 85 A4-70 (1.4404/316L), hexagon nut DIN 934 M8 A4-70 (1.4404/316L) Ʋ Ground terminal 316Ti/316L Ʋ Connection between IP68 transmitter PE, PUR and external electronics housing Note deviating process temperature limits Glass with Aluminium and stainless steel precision casting housing VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 71 Max. adjustment range 0.15 psig -0.15 psig … +0.15 psig -0.18 psig … +0.18 psig 0.45 psig 0.45 psig … +0.45 psig -0.54 psig … +-0.54 psig 1.5 psig -1.5 psig … +1.5 psig -1.8 psig … +1.8 psig 7.5 psig -7.5 psig … +7.5 psig -9 psig … +9 psig 45 psig -45 psig … +45 psig -5.4 psig … +5.4 psig 240 psig -240 psig … +240 psig -288 psig … +288 psig 580 psig -580 psig … +580 psig -696 psig … +696 psig 4 layers PTFE VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 72 Reference conditions and influencing variables (according to DIN EN 60770-1) Reference conditions according to DIN EN 61298-1 Ʋ Temperature +18 … +30 °C (+64 … +86 °F) Ʋ Relative humidity 45 … 75 % Ʋ Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig) Determination of characteristics Limit point adjustment according to IEC 61298-2 VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 73 Flow > 50 % Measuring range TD ≤ 5 : 1 TD > 5 : 1 TD > 10 : 1 10 mbar (1 kPa)/0.145 psi < ±0.1 % < ±0.02 % x TD 30 mbar (3 kPa)/0.44 psi Measuring range end, absolute pressure Root characteristic VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 74 < ±0.5 % 160 bar (16000 kPa) 500 mbar (50 kPa)/7.3 psi resp. 3 bar (300 kPa)/43.51 psi 400 bar (40000 kPa) 16 bar (1600 kPa)/232.1 psi Root characteristic Relating to the adjusted span. Relating to the measuring range end value. Measuring range end, absolute pressure. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 75 FKM (ERIKS 514531) Silicone oil -20 … +105 °C (-4 … +221 °F) Halocarbon oil for oxygen applica- -10 … +60 °C (-4 … +140 °F) tions Measuring range end, absolute pressure. Relating to the adjusted span. Relating to the measuring range end value. With entry into the process fitting, connection via valve block, brief venting, no permanent flow through the measuring chambers VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 76 4 g at 5 … 200 Hz according to EN 60068-2-6 (vibration with resonance) Shock resistance 50 g, 2.3 ms according to EN 60068-2-27 (mechanical shock) Reference temperature +25 °C (+77 °F). 2 g with housing version stainless steel double chamber VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 77 Ʋ Colour PUR Blue Connection cable, electrical data Ʋ Wire cross-section 0.5 mm² (AWG 20) Ʋ Wire resistance R 0.037 Ω/m (0.012 Ω/ft) ´ Interface to the external display and adjustment unit Data transmission Digital (I²C-Bus) IP66/IP68 (0.2 bar), only with absolute pressure. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 78 Conductive connection Between ground terminal and metallic process fitting Electrical protective measures Housing material Version Protection acc. to Protection acc. to IEC 60529 NEMA Plastic IP66/IP67 Type 4x Aluminium Double chamber IP66/IP68 (0.2 bar) Type 6P Stainless steel, precision casting VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 79: Device Communication Modbus

    (4 bytes) according to IEEE 754 are transmitted with individually selectable order of the data bytes (byte transmission order). This " Byte transmission order" is determined in the parameter " Format Code". Hence the RTU knows the registers of the VEGADIF 85 which must be contacted for the variables and status information.

  • Page 80: Modbus Register

    Primary Variable in Byte Order of Register 3000 1304 Secondary Variable in Byte Order of Register 3000 1306 Third Variable in Byte Order of Register 3000 1308 Quarternary Variable in Byte Order of Register 3000 VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 81 2208 DWord Quarternary Variable in Byte Order BACD (Middle Endian) Unit Codes for Register 104, 108, 112, 116 Unit Code Measurement Unit in H2O in Hg ft H2O mm H2O mm Hg mbar VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 82: Modbus Rtu Commands

    Data FC4 Read Input Register With this command, any number (1-127) of input registers is read out. The start register, from which the readout should start, and the number of registers are transmitted. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 83 With sub function codes 0x00 only one 16 bit value can be written. FC16 Write Multiple Register This function code is used to write to several Holding Registers. In a request, it can only be written to registers that are in direct succession. VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 84 1 Byte Object ID number Number of Objects 1 Byte List of Object ID 1 Byte List of Object length 1 Byte List of Object value 1 Byte Depending on the Object ID VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 85: Levelmaster Commands

    11 Supplement 11.5 Levelmaster commands The VEGADIF 85 is also suitable for connection to the following RTUs with Levelmaster protocol. The Levelmaster protocol is often called " Siemens" " Tank protocol". Protocol ABB Totalflow Levelmaster Kimray DACC 2000/3000 Levelmaster Thermo Electron Autopilot Levelmaster...
  • Page 86 8 (12) characters ASCII UuuBbbbb[b][pds] Bbbbb[b] = 1200, 9600 (default) pds = parity, data length, stop bit (optional) parity: none = N, even = E (default), odd = O Response: Set Baud Rate 11 characters ASCII Example: U01B9600E71 Change instrument on address 1 to baudrate 9600, parity even, 7 data bits, 1 stop bit VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 87 7 characters ASCII UuuRmmm Delay mmm = milliseconds (50 up to 250), default = 127 ms Error codes Error Code Name EE-Error Error While Storing Data in EEPROM FR-Error Erorr in Frame (too short, too long, wrong data) LV-Error Value out of limits VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 88: Configuration Of Typical Modbus Hosts

    11 Supplement 11.6 Configuration of typical Modbus hosts Fisher ROC 809 (Rx/Tx -) (Rx/Tx +) Fig. 47: Connection of VEGADIF 85 to RTU Fisher ROC 809 VEGADIF 85 RTU Fisher ROC 809 Voltage supply Parameters for Modbus Hosts Parameter Value Fisher Value ABB Total...

  • Page 89: Calculation Of The Total Deviation - Practical Example

    FTD: Additional factor Turn down 11.8 Calculation of the total deviation - Practical example Data Differential pressure 250 mbar (25 KPa), medium temperature on the measuring cell 60 °C VEGADIF 85 with measuring range 500 mbar The required values for the temperature error F , deviation F and long-term stability F are avail- stab able in the technical data.

  • Page 90: Dimensions, Versions Process Component

    11.9 Dimensions, versions process component The following dimensional drawings represent only an extract of the possible versions. Detailed dimensional drawings can be downloaded at www.vega.com under " Downloads" and " Drawings". Relating to the adjusted span. Relating to the measuring range end value.
  • Page 91 Aluminium/Stainless steel double chamber Ventilation on process axis 80 mm 54 mm (3.15") (2.13") 86 mm (3.36") Fig. 49: VEGADIF 85, ventilation on process axis Connection Fastening Material Scope of delivery ¼-18 NPT, IEC 61518 7/16-20 UNF 316L incl. 2 vent valves ¼-18 NPT, IEC 61518...
  • Page 92 (2.13") 86,1 mm 86,1 mm (3.39") (3.39") Fig. 51: left: Process fitting VEGADIF 85 prepared for chemical seal assembly. right: Position of the copper ring seal Chemical seal connection Copper ring seal Separating diaphragm VEGADIF 85 • Modbus and Levelmaster protocol...

  • Page 93: Industrial Property Rights

    Les lignes de produits VEGA sont globalement protégées par des droits de propriété intellec- tuelle. Pour plus d'informations, on pourra se référer au site www.vega.com. VEGA lineas de productos están protegidas por los derechos en el campo de la propiedad indus- trial. Para mayor información revise la pagina web www.vega.com.
  • Page 94 Notes VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 95 Notes VEGADIF 85 • Modbus and Levelmaster protocol...
  • Page 96 Subject to change without prior notice © VEGA Grieshaber KG, Schiltach/Germany 2023 VEGA Grieshaber KG Am Hohenstein 113 Phone +49 7836 50-0 77761 Schiltach E-mail: info.de@vega.com...

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