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Summary of Contents for enraf 854 ATG Series
- Page 1 December 2005 Part no. 4416.220 Rev. 3 Enraf B.V. P.O. Box 812 2600 AV Delft Netherlands Tel. : +31 15 2701 100 : +31 15 2701 111 E-mail : info@enraf.nl Website : http://www.enraf.com Instruction manual 854 ATG Page 1...
- Page 2 Copyright 1999 - 2005 Enraf B.V. All rights reserved. Reproduction in any form without the prior consent of Enraf B.V. is not allowed. This manual is for information only. The contents, descriptions and specifications are subject to change without notice. Enraf B.V. accepts no responsibility for any errors that may appear in this manual.
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Page 3: Preface
Preface Preface This manual is intended for technicians involved with the commissioning and service of the Enraf series 854 Advanced Technology Gauge. A description preceding the technical procedures gives the technical information necessary to understand its functioning. It is recommended to read this description prior to performing any of the procedures. -
Page 4: Table Of Contents
Table of contents Table of contents Preface ................3 Introduction . - Page 5 Table of contents Maintenance ............... . 34 Preventive maintenance .
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Page 6: Introduction
The 854 ATG has four programmable level alarms, and also provides diagnostic information. This information can be displayed on the internal display, the Portable Enraf Terminal (PET) as well as on remote systems. Optionally, the instrument can be provided with software for density measurement of the stored product. -
Page 7: Level Measurement
Alarm relays are optionally available on the SPU II board. Density measurement is an optional module of the SPU software. An XPU-2 board (in stead of the standard XPU board) is required with the following options: external HART water bottom probe (e.g. Enraf 964 WaterScout), RS-232C/RS-485 communication, and connection for a 977 Tank Side Indicator. -
Page 8: Remote Monitoring
CPI panel indicator. 1.4 Approvals (FM, CENELEC) The Enraf 854 Advanced Technology Gauges are certified by official testing institutes as Factory Mutual and PTB (CENELEC) to be explosion proof (suitable for zone 0). The gauges are also approved and certified by Weights and Measures (W&M) or Custom and Excise authorities for legal use and custody transfer. -
Page 9: Safety
Programming (configuration) of the 854 ATG can be done by the 847 PET (Portable Enraf Terminal), which is an intrinsically safe device and is connected to the 854 ATG via an infra-red coupling. -
Page 10: Personal Safety
Safety 2.2 Personal safety Safe execution of the procedures in this manual requires technical experience in handling tools, and knowledge of safety regulations in handling electrical installation in hazardous environments. The sequence of steps in a procedure may also be important from the point of view of personal safety and prevention of damage;... -
Page 11: Commissioning
Commissioning Commissioning Caution Keep screw thread from the compartment covers free from dirt. Grease them lightly with an acid-free grease before closing the instrument. When closing, turn the covers counter-clockwise until the thread clicks into place, then turn clockwise. 3.1 Checks before starting the commissioning Examine the mechanical and electrical installation after the 854 ATG is installed on the tank. -
Page 12: Installation Of Measuring Drum And Displacer
3.2 Installation of measuring drum and displacer 3.2.1 Tools It is recommended to use an 847 PET (Portable Enraf Terminal) to load the different parameters. A tool set for commissioning and maintenance is available from Enraf (refer to figure 3.1). -
Page 13: Installation Of Displacer
Loosen (do not remove) the Allen key screw and turn the transport bracket the opposite way. Use screwdriver for Allen key screws M4 (item 8 of the Enraf tool set). Fix the Allen key screw of the transport bracket. Check the span wire. It should always be under tension while... -
Page 14: Programming (Configuring) The Gauge
The instrument can be totally programmed out in the field, or remotely, without opening the gauge. It is recommended to use an 847 PET (Portable Enraf Terminal) to load the different parameters. It is coupled to the 854 ATG via an infra-red coupling. - Page 15 Commissioning Protection level 1 Access to items which are not directly measurement related, such as high level alarm (HA), tank identifier (TI), etc. is protected by password 1 (W1). It is possible to modify these data only after entering the correct level 1 password W1=XXXXXX, where XXXXXX is the level 1 password.
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Page 16: Apply Power To The 854 Atg
Commissioning How to program? When the 847 PET is plugged into the 854 ATG and the instrument is powered, the PET can be switched on. By operating the keyboard, items can be requested and settings can be changed. For example: Item (+ setting) Description (typing in on PET keyboard) -
Page 17: Selecting Dimension And Decimal Separator
Commissioning 3.3.3 Selecting dimension and decimal separator When one of the dimension items are changed, all items with related formats have to be changed and the values must be converted to the new dimension. The same applies for the decimal separator. Note: When the 854 ATG is equipped with an XPU-2 board (can be recognised by requesting the software version item SV reads: XPU ... -
Page 18: Tank And Gauge Data
Commissioning 3.3.4 Tank and gauge data Refer to figure 3.7 for the tank related data. Gauge tank top TT Motor limit switch MH Lock-test limit switch level MZ High-high alarm level HH High alarm level HA Liquid level RL (used at calibration procedure) Low alarm level LA Low-low alarm level LL... - Page 19 If a density displacer is used, program S1 as: (DW - 15). TA= Transmission address Two digits. The transmission address identifies the gauge on the Enraf 2-wire field bus. Each gauge must have a unique address, and hence TA must be programmed differently. When connected to an 858 CIU,...
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Page 20: Alarm Settings
<enter> Exit protection level. 3.3.5 Alarm settings Refer to figure 3.7. The high level alarm (HA) and low level alarm (LA) conditions are transmitted to the host via the 2-wire Enraf field bus (or optional RS-channel). Item Name Description Protection level 2 Enter protection level 2 (default level 2 password: ENRAF2). -
Page 21: Ullage Readout
The ullage value is also transmitted to the host via the 2-wire Enraf field bus (or optional RS-channel). The ullage, or outage, measurement is referred to a ‘zero’ point at the tank top (upper reference point). -
Page 22: Display Control And Password Protection
Commissioning 3.3.7 Display control and password protection Item Name Description Protection level 2 Enter protection level 2 (default password: ENRAF2) DF= Display format One character. Selects the data which will be shown on the XPU display (refer to Appendix D for a detailed overview). level and temperature level average gas temperature... -
Page 23: Level Calibration
A tank top reference stop is a mechanical device that can hold the displacer at a reproducible position when the displacer is pulled up. This device is placed above the motor limit switch high position. An Enraf tank adapter can be provided with such a facility. -
Page 24: Level Calibration Using The Top Of Ball Valve
Commissioning 3.4.3 Level calibration using the top of ball valve If level dipping is not possible, the 854 ATG can be calibrated using the top of a ball valve as reference point. Proceed as follows: Item Name Description Protection level 2 Enter protection level 2 password Calibrate The displacer will be raised until it stops against the flange of the level... -
Page 25: Interface Measurement
Commissioning 3.4.4 Interface measurement Interface 3 (I3) is used as product / water interface measurement (with interface 2 (I2) another interface can be measured). The set point S3 has to be set to such a value that half of the displacer volume is immersed in the water and the other half of the displacer volume is immersed in the product. -
Page 26: Operation
HIMS density water level from external HART probe (only with XPU-2) Refer to Appendix D for an overview of the different display formats. ENRAF VIEW ANGLE XPU-2 Figure 4.1 Display of XPU and XPU-2... -
Page 27: Xpu Display
Operation 4.1.1 XPU display Display contrast For best readability the viewing angle can be adjusted, using a small potentiometer on the XPU board, on the bottom left (refer to figure 4.1). Normally, it is adjusted in the factory for viewing horizontally. Repeatability test If the test magnet (item 7 of the tool kit) is hold for approximately 5 seconds in front of the rectangle block below the display, a repeatability test is performed. - Page 28 Operation Function Additional display and function of other switches switch L Display configuration R display test (blank test / dark test) U display contrast up D display contrast down Display format toggle (formats A - K) U previous display format D next display format NOVRAM item view (all items) R fast forward...
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Page 29: Repeatability Test
Operation 4.2 Repeatability test With the repeatability test the displacer is raised for approximately 75 mm (3”) and then returns to the product surface. During the test, the level dimension and level type on the display are replaced by exclamation marks (!!! !!!) and the status field (I1) changes to TG. -
Page 30: Freeze And Block Commands
Operation 4.4 Freeze and block commands Both the freeze (FR) and block (BL) commands stops the displacer at the current position. With the freeze command, the displacer remains in its position even when the level reaches the displacer position. Hence, the level can not be followed and the high and high high level alarms can not be generated. The block command stops the displacer, and depending on how the block mode (item BM) is set, the displacer will move up with an increasing level, or the block is cancelled when the level reaches the displacer position. -
Page 31: Interface Measurement
Operation 4.6 Interface measurement The 854 ATG can measure three different interfaces. Interface 1 (I1) is normally used to measure the product level. Interface 3 (I3) can be used to measure the product / water interface. Interface 2 (I2) is a setting for a special measurement (i.e. -
Page 32: Verify Level Calibration
Operation 4.8 Verify level calibration 4.8.1 Verify level calibration against a tank top reference stop When a tank adapter with a tank top reference stop is installed, the level calibration of the 854 ATG can be checked. Proceed as follows: Item Name Description... -
Page 33: Data Items And Operational Commands
Operation If the reference level value and the gauge reading differs more than the specified value, the calibration procedure as described in section 3.4.3 should be repeated. 4.9 Data items and operational commands Below a summary of data items, error codes and operational commands. Data items: Item Description... -
Page 34: Maintenance
Maintenance Maintenance 5.1 Preventive maintenance Whether maintenance is needed can be checked with the following tests: Repeatability test (refer to section 4.2). If repeatability deteriorates (more than 1 mm) the drum bearings should be replaced (refer to section 5.3.3). Balance test The measuring drum unbalance can be measured by the following procedure: Item Name... -
Page 35: Instrument Covers
The 854 ATG is an explosion proof instrument with intrinsically safe output/input circuits. Modification to the instrument may only be carried out by trained personnel which is authorized by Enraf. Failure to adhere to this will invalidate the approval certificate. -
Page 36: Drum Compartment
Maintenance 5.3 Drum compartment 5.3.1 Detailed description Figure 5.1 shows the cross-section of the drum compartment of the medium pressure version and identifies the components. Figure 5.2 shows the chemical and high pressure version. The drum shaft, mounted in the drum with a tolerance ring, is inserted into the magnet cap. Two carbon PTFE bearings in the drum shaft bushing support the drum shaft. -
Page 37: Removing The Measuring Drum
Maintenance 5.3.2 Removing the measuring drum Removing the drum from the housing requires no tools. Keep the drum, the outer magnet and the outside of the magnet cap thoroughly clean. To remove the drum proceed as follows: Issue the CA (calibrate) command to raise the displacer If applicable close the ball valve and release the pressure gently. -
Page 38: Replacing The Drum Bearings
Maintenance 5.3.3 Replacing the drum bearings Open the drum cover. Take out the drum shaft bushing. Replace the bearings, refer to figure 5.3. Install the bushing. Install drum and displacer. Close the cover. Figure 5.3 Replacing the drum shaft bearings Caution Do not grease the carbon PTFE bearings. -
Page 39: The Electronic Compartment
Maintenance 5.4 The electronic compartment 5.4.1 Detailed description The electronic part of the 854 ATG requires no special maintenance. However, a detailed description of the combination of the several parts is given in order to help you in case of software-updates or system enhancements. -
Page 40: Dismantling The Electronic Compartment
Repair of the 854 printed circuit boards Field repair of the electronic boards is not advised. The components that can be replaced in the field are EPROMs and NOVRAM, see section 5.4.3 for updating software versions. Consult the service department of Enraf. Page 40... -
Page 41: Replacing Software
When the gauge is powered, issue the IN command by the PET 3 times in sequence. After the first command, use the “↑” key and “enter” key. No other command may interfere in this sequence. Note: To prevent other commands in the initialization sequence, the Enraf field bus lines may, temporary, be disconnected. Instruction manual 854 ATG... -
Page 42: Calibrating Force Transducer
Maintenance 5.5 Calibrating force transducer After mounting a new force transducer or another motor-block the force transducer must be calibrated. The frequency of the force transducer must be calibrated with help of a set of accurate test weights of 25 g, 75 g, 150 g and 225 g, all ±0.1 g. Check the mounting of the 854 ATG whether it is stable and horizontal. -
Page 43: Synchronizing The Reference Encoder
Maintenance Do not yet reprogram this value in the gauge. Reprogram all values after completion of all the four calibration measurements. Repeat this calibration from item BT for the other 3 test weight combinations: for F1 with: (25+75 g), for F2 with: (25+150 g), for F3 with: (25+225 g). -
Page 44: Trouble Shooting
Trouble shooting Trouble shooting The 854 ATG is an instrument with self diagnostics. Detected errors will be shown as status information on the display (refer to Appendix D), or can be requested as items by the PET. The following items contain the error codes of the processor boards: Error XPU(-2) request (communication processor unit) Error SPU request (servo processor unit) These items contain an error code of the last error condition. -
Page 45: Xpu Error Code (Item Ep)
Some XPU error codes of item EP are listed below, with suggestions for solving the problem. For a complete overview, refer to “Item documentation for Enraf series 854 ATG“ and in the item help of the service tool Ensite. No error NOVRAM version error New software is installed;... -
Page 46: Spu Status Request (Item Qs)
Trouble shooting 6.4 SPU status request (item QS) The servo status request (item QS) consists of four bytes. Bytes 0, 1 and 2 are bit coded with information about the level alarms, operational mode and general status. Byte 3 is an ASCII character that indicates the active operational command. -
Page 47: Appendix A Article And Part Numbers
Appendix Appendix A Article and part numbers Description Part no. circlip 2147.205 drum with 27 m stainless steel wire + shaft and circlip 0854.962 drum shaft 0185.441 screw + ring 6 pcs 0854.941 screw + ring 3 pcs 0854.942 seal assembly cpl. 0854.943 6576.001 ground lip + screw + ring... - Page 48 Appendix Description Part no. XPU printed circuit board 0854.635 EPROM programmed for XPU 32k, 24 pins 0181.175 EPROM programmed for XPU 64k, 28 pins 0181.174 XPU-2 printed circuit board for water bottom measurement 0873.620 XPU-2 printed circuit board with i.s. connection to 977 TSI 0873.621 XPU-2 printed circuit board with RS-232C communication channel 0873.623...
- Page 49 Appendix Instruction manual 854 ATG Page 49...
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Page 50: Appendix B Additional Information On Displacers
Appendix Appendix B Additional information on displacers Displacer type Part number Displacer area (DA) Displacer volume (DV) Displacer weight (DW) [cm ] [cm ] Carbon filled PTFE ø 25 mm 0815.360 +.10000000E+02 +.10500000E+03 +.22300000E+03 ø 45 mm 0815.343 +.16000000E+02 +.10500000E+03 +.22300000E+03 ø... - Page 51 Appendix Standard displacer Density displacer 13.0 cm 88.3 cm remaining volume » 55.5 mm 14.2 mm 90.3 cm 10.0 cm 3.2 cm 4.7 mm 6.0 mm ø90 mm ø45 mm »265 g 0815.350 223 g 0815.343 45.5 cm 53.8 cm 8.5 mm 1.5 mm 3.3 cm...
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Page 52: Appendix Cascii Table
Appendix Appendix C ASCII table Page 52... -
Page 53: Appendix D Display Formats
Appendix Appendix D Display formats Level Dimension Level type metres innage feet compensated innage inches ullage fractions format example - ↑ T T T . 3 6 ° Temperature Level status Balance test Measurement blocked Dimension or status Calibrate Dip mode SPU failure or Maintenance mode Freeze GD command... - Page 54 Appendix Level Dimension Level type metres innage feet compensated innage inches ullage fractions example format - ↑ Level alarms Level status High high level alarm Balance test Low low level alarm Measurement blocked High level alarm Calibrate Low level alarm Dip mode No level alarm SPU failure or Maintenance mode...
- Page 55 Appendix example format T T T . 3 6 ° Temperature Status of sensor element One or more elements in failure All elements operational Dimension or status General temperature failure °C Valid temperature °F Valid temperature Failure in average product temperature Device not calibrated (MTT only) Temperature out of range Exceeding differential temperature range (MTT only)
- Page 56 Appendix Status pressure P1 General HPU / HSU / OPU failure Pressure transmitter not installed (item PA) Pressure transmitter failure (or absent) Pressure transmitter out of range Pressure transmitter exceeds trip pressure Valid pressure Text Status pressure P3 (display format F) General HPU / HSU / OPU failure (display format H) Manual pressure...
- Page 57 Appendix Output error General status or error code Output error General analog output failure specified in next field Disabled analog output Valid output Last valid level used Invalid level used Out of range No (last) (valid) level available Level time out Out of 4...20 mA range Level failure In 4...20 mA range...
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Page 58: Appendix Epcb Layout
Appendix Appendix E PCB layout EPROM SPU_II X.P.U. ENRAF NONIUS CN 1 REL1 REL2 CO NO NC CO NO NC NOVRAM IC19 NOVRAM IC15 IC16 IC17 IC12 IC13 IC14 IC10 PROCESSOR Jumpers VIEW ANGLE XPU-2 SPU_II ENRAF-NONIUS HSU 854 HART... -
Page 59: Appendix F Related Documents
Instruction manual 862 MIT Instruction manual HIMS Instruction manual 977 Tank Side Indicator Item documentation for Enraf series 854 level gauges, 873 SmartRadar and 877 FDI Instruction manual 847 Portable Enraf Terminal Instruction manual Ensite service tool Protocol manual for 854 series level gauges... -
Page 60: Index
Caution ....... . 10 Enraf field bus ......21 CD . - Page 61 Items ........14 Portable Enraf Terminal ....9, 14 format depended .
- Page 62 Index SM ....... . 43, 44 Ullage ....... . . 21 SO .
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