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44

BM 70 M

8.6.3 Block distance, antenna type and antenna extension

Fct. 3.1.2 BLOCKDIST

•

Caked deposits or contamination of the antenna, for example, can cause faulty measurements
directly below the antenna. The function "block distance" is used to specify a zone below the
flange in which measurements are not to be carried out.

•

Signals within the block distance are suppressed; a rise in the level above this limit will result
in a measurement corresponding to a distance = block distance, when Fct. 3.5.6 BD-DETECT
= ON.

•

Unit and setting range: same as Fct. 3.1.1 TANKHEIGHT.

•

Recommended minimum value (see also Sect. 3.3):
- for stilling wells
- antenna 300 mm
- all other versions in storage tanks:
- antenna ext antenna 100 mm
- all other versions in process tanks:
- antenna ext antenna 200 mm

Fct. 3.1.3 ANTENNA

•

The antenna type is factory-set here.

•

STANDARD

•

BM 70 M: only STANDARD setting possible.

Fct. 3.1.4 ANT.EXTENS.

The length of the supplied antenna extension is factory-set here.

•

Unit and setting range: same as Fct. 3.1.1 TANKHEIGHT.

This setting may only be changed when a longer or shorter antenna extension is installed.
Otherwise faulty measurements may result because the BM 70 M allows for this length when
measuring. After changing any antenna extension, record a new empty spectrum, see Sect.
8.6.12. When a curved antenna extension is used, only the vertical component (vertical offset)
should be entered here.
Example (S-shaped extension): Fct. 3.1.4 = 323 mm.

8.6.4 Distance

piece

Fct. 3.1.5 DIST.PIECE

The length of any supplied distance piece above the mounting flange is factory-set here.

•

Setting range: 0 ... 2000 mm

•

Default value: 0 mm

The value of 120 mm should be entered for the high-temperature version of the flange system.
When a curved antenna extension is used, the horizontal component of this extension should
additionally be entered (= geometric length of the pipe minus the vertical offset).
Example (see drawing above): Fct. 3.1.5 = 300 mm.

323 mm

300 mm

(Fct. 3.1.4)

(Fct. 3.1.5)

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Содержание BM 70 M Series

Страница 1: ...x BM 70 Mi EEx KROHNE 08 2002 7 10027 21 00 GR Variable area flowmeters Vortex flowmeters Flow controllers Electromagnetic flowmeters Ultrasonic flowmeters Mass flowmeters Level measuring instruments...

Страница 2: ...nsient recovery time 14 5 6 Long term drift 14 5 7 Effect of ambient temperature 14 6 Operating conditions 14 6 1 Installation conditions 15 6 1 1 Transmission angle 15 6 1 2 Recommendations for posit...

Страница 3: ...ctrum 51 8 6 13 Time constant and tracking speed 54 8 6 14 Multiple reflections and block distance detection 54 8 6 15 Tank bottom tracing system 55 8 6 16 Tank type movement of product surface 56 8 6...

Страница 4: ...pplied Depending on the version ordered we supply the following Signal converter bolted to waveguide window and antenna Optional antenna extension sunshade with fastening material in each case Report...

Страница 5: ...The difference is directly proportional to the distance i e a large frequency difference corresponds to a large distance and vice versa The frequency difference is transformed via a Fourier transform...

Страница 6: ...low for plausibilities and history The following diagram describes the path of internal signal processing After automatic gain control the measuring signal is filtered digitized and converted into a f...

Страница 7: ...tem 3 Input 3 1 Measured variable distance level volume reflection The primary measured variable is the distance between a reference point as standard tank mounting flange and a reflecting surface e g...

Страница 8: ...ART protocol together with switching output and digital input 4 2 4 4 Ex i current output HART intrinsically safe passive HART protocol optionally with intrinsically safe switching output 4 3 4 4 Curr...

Страница 9: ...nd switching output Current 4 20 mA without or with error message 2 mA and 22 mA Accuracy linearity 0 05 rel 20 mA at T 20 C 100ohm load impedance and nominal operating voltage Temperature drift 100 p...

Страница 10: ...ondition Operating data 6 30 V ILow 110 mA ULow 2V IHigh 900 A U 30V and IHigh 200 A U 8V Ex i safety limits Signal circuit in type of protection Intrinsic Safety EEx ia IIC IIB or EEx ib IIC IIB for...

Страница 11: ...2 mA when load 250 Ohm No load voltage 18 V 4 6 Digital interface RS 485 RS 485 is a bus that allows two way Communication half duplex operation with the BM 70 M Level Radar When the computer system s...

Страница 12: ...at the last device should be terminated with the typical surge impedance of the cable 120 Ohm To do this inside the BM 70 M see Section 7 7 4 7 Breakdown signal Breakdown information can be called up...

Страница 13: ...vate it completely the setting will need to be changed in the Service menu of the BM 70 M 5 Measuring accuracy 5 1 Reference conditions Temperature 20 C 68 F Pressure 1013 mbar abs 14 5 psia Air humid...

Страница 14: ...rature effects using reference measurements in liquid tanks it needs to be remembered that liquids generally have a high coefficient of expansion organic liquids typically 0 15 C 6 Operating condition...

Страница 15: ...tical in which the power density of the radar waves assumes half the value of the maximum power density half power beam width Antenna Type Diameter mm inches Transmissi on angle Lobe expansion s per m...

Страница 16: ...on above internals interference reflections If these recommendations cannot be followed because of the tank geometry please consult KROHNE B Stilling well or Wave Guide A stilling well or Wave Guide m...

Страница 17: ...Type 3 140 mm 5 5 223 mm 8 8 Hastelloy 30 mm 1 2 subject to change without notice An antenna extension should be added if the antenna does not project out of the fitting Antenna extensions are availa...

Страница 18: ...embled stilling well is necessary abrupt changes in diameter along the pipe should be less than 1 mm 0 04 Surface roughness of the inside of the pipe should not be more than 0 1 mm 0 004 For the BM 70...

Страница 19: ...ave Guide is a pipe with an outside diameter of 30 mm 1 18 and an inside diameter of 25 mm 0 98 that is bolted direct to the BM 70 flange system in the same way as an antenna extension It functions li...

Страница 20: ...nal converter Standard sizes others on request Dimensions in mm inches 6 1 7 Special options for the flange Antenna heating cooling device DN150 6 Purging device DN100 Double walled antenna for coolin...

Страница 21: ...he gasket align the BM 70 M and the gasket Insert stud bolts and tighten nuts slightly by hand These items not included with supply Tighten down stud bolts and nuts firmly The torque is dependent on t...

Страница 22: ...The device has been found to withstand the impact test in conformity with EN 61010 Section 8 2 with 0 5 J energy and the drop test to prEN 50178 1994 6 2 9 Vibration endurance limit Type test conditi...

Страница 23: ...iquid ammonia liquid hydrogen liquid helium 6 3 4 Product temperature unrestricted The product temperature is not a relevant factor provided the ambient temperature see 6 2 2 and the flange temperatur...

Страница 24: ...washing down or cleaning with mechanical aids take special care not to damage either the horn antenna or the bottom Teflon plug at the waveguide window see Section 7 3 Field assembly of the BM 70 M If...

Страница 25: ...remove this first see Section 6 1 9 2 Disconnect all cables from the terminals in the terminal compartment see Section 7 6 3 Remove the 4 Allen screws M Allen key size 5 mm and lift off the signal con...

Страница 26: ...onality of the BM 70 M Bolt antenna and antenna extension together torque for the 3 stud bolts max 8 Nm 0 8 kpm Do not on any account detach screws H 7 4 Materials of construction Check the materials...

Страница 27: ...e limitations due to Ex approval see Part 2 of this installation and operating instructions Responsibility as to suitability rests solely with the user Available materials for internal device seals an...

Страница 28: ...on see also terminal assignments below and in Sect 9 4 Cable entries 3x M25x1 5 with standard cable gland cable clamping area 9 16 mm Signal cable shielding required for RS 485 line recommended for cu...

Страница 29: ...41 Current output Switching output max 100mA 30V DCAC Digital input 82 81 5 28V 4 20mA max 500 32 31 Ex i IS supply unit U max 30V Current output 4 20mA U min 8V Current output Switching output max 11...

Страница 30: ...rried out directly at the device If a local display is not featured the PC CAT program see Sect 8 12 must be used to change the parameter setting assuming a communicable interface is provided The avai...

Страница 31: ...Note When YES is set under Fct 3 4 2 and ENTRY CODE CodE1 appears in the display the key must be pressed The 9 keystroke Entry Code1 must then be entered Factory setting each keystroke confirmed in t...

Страница 32: ...3 4 4 3 3 1 3 3 7 3 1 1 3 1 8 3 2 1 3 2 5 Directions for using the keys in the menu levels and colum ns The flashing part of the display cursor can be changed Selection of function with the key 1 0 OP...

Страница 33: ...627 637 cm cm To shift cursor flashing position Shift to right 637 637 cm cm To change the text Select next text LEVEL DISTANCE To change the unit tank height Numerical values are converted automatica...

Страница 34: ...V Options USER UNIT Cubic meter m3 Select unit for conversion value to be displayed volume table 2 0 TEST 2 1 HARDWARE 2 1 1 MASTER Special function Tests the hardware of the master 2 1 2 DISPLAY Spec...

Страница 35: ...ered here is also used for all other length inputs 3 1 2 BLOCKDIST Enter 0 10 m tank height 0 50 m To input the block distance The block distance marks the non measurable range below the bottom edge o...

Страница 36: ...or display of the conversion value 3 2 4 USER UNIT Text entry 10 ASCII characters ________ Input of freely programmable unit for the conversion table max 10 characters Options NO 3 2 5 ERROR MSG YES Y...

Страница 37: ...FOUND deviating options 3 3 6 ADDRESS Enter 0 255 0 Input of the device address for Communication For Fct 3 3 7 PROFIBUS PA or F FOUND deviating input range Options HART MODBUS PROFIBUS PA 3 3 7 PROTO...

Страница 38: ...on off Options NO 3 5 6 BD DETECT YES YES Switch the block distance overfill detector on off Options OFF 3 5 7 FUNCT FTB PARTIAL OFF Select function of the tank bottom tracking system 3 5 8 EPSILON R...

Страница 39: ...for the switching output Input is dependent on the function of the switching output Default values following a parameter reset use of a new EEPROM not yet described The factory setting for the parame...

Страница 40: ...greater than the response threshold 8 5 2 Volume measurement example In order to be able to measure volume with the BM 70 M a conversion table volume table needs to be compiled with the PC CAT program...

Страница 41: ...following functions Block distance Fct 3 1 2 Antenna extension Fct 3 1 4 Scaling 4 mA value current output Fct 3 3 3 Scaling 20 mA value current output Fct 3 3 4 Range for partial tank bottom tracing...

Страница 42: ...l conversion pairs The values are linearly established interpolated between 2 points Also for the local display an arbitrary max 10 character text Fct 3 2 4 can be defined as a unit under Fct 3 2 4 In...

Страница 43: ...64 131 22 ft For BM 70 M max 35m 1377 9 inch 114 8 ft Depending on the version it is also possible to set an upper limit for the tank height The maximum value can be increased by KROHNE Service to up...

Страница 44: ...etting possible Fct 3 1 4 ANT EXTENS The length of the supplied antenna extension is factory set here Unit and setting range same as Fct 3 1 1 TANKHEIGHT This setting may only be changed when a longer...

Страница 45: ...e see Example 1 below The offset is effective for all distance values local display current output switching output digital information Setting range 10 m 10 m 32 8 ft Default value 0 Fct 3 1 8 TB OFF...

Страница 46: ...offset 2 m Reference offset 0 The possible measuring range is Level 2 m to 8 m block distance Example 3 Only a specific part of the level in a very tall tank is to be measured in the example levels 5...

Страница 47: ...are displayed in the form of vertical lines in the first line of the display 0 1 segment 100 25 segments Fct 3 2 3 or Fct 1 1 3 UNIT CONV Use this function to select the unit for conversion display m...

Страница 48: ...Fct 3 3 1 Setting range and unit for SCALE 4 mA same as for Fct 3 1 1 TANKHEIGHT If a reference or tank bottom offset is set this must be allowed for Setting CONVERSION under Fct 3 3 1 Unit for SCALE...

Страница 49: ...rameters and functions of the BM 70 M In addition there is the device description DD for BM 70 M which can be used for universal HART control units such as the HART Communicator or SIPROM The standard...

Страница 50: ...1 GB USA English E Spanish Espa ol D German P Portuguese F French S Swedish I Italian Coding desired for entry into setting level Set NO or YES in Fct 3 4 2 ENTRY CODE1 If NO set simply press key WR...

Страница 51: ...rferences for automatic determination of the tank height Press key to abort the operation In this case you will need to enter the tank height manually with Fct 3 1 1 8 6 12 Empty spectrum What is an e...

Страница 52: ...ctory set is here AVERAGE normal empty spectrum This setting is suitable for most applications possible alternative Recording of the empty spectrum over the full range If the tank cannot be drained ov...

Страница 53: ...corded Of advantage in conjunction with difficult agitators for example If the tank is not completely drained the empty tank spectrum can nevertheless still be recorded up to a certain range In this c...

Страница 54: ...ld be set as the minimum value Setting ranges 0 01 1 00 m min if Fct 3 1 1 Unit m cm mm 0 03 3 28 ft min if Fct 3 1 1 Unit inch ft Default 0 1 m min BM 70 M See also Sect 8 8 error message NO M VALUE...

Страница 55: ...is parameter can also be determined by a KROHNE Service technician from the recording of a tank filling or draining operation with the user program see Sect 8 12 The level in the tank should in this c...

Страница 56: ...ing accuracy and or skipping of the measured value on changeover from tank bottom tracing to the normal measuring mode evaluation of reflection from the product surface see diagram at the right 8 6 16...

Страница 57: ...OFF ERROR OPEN or ERROR CLOSED is set under Fct 3 6 1 Not significant in this case Use this function to define the threshold limit value Setting of LEVEL or DISTANCE under Fct 3 6 1 Unit same as for...

Страница 58: ...rsion Contact closes when upper limit exceeded CONVERSION HIGH yes yes Contact closes when lower limit exceeded CONVERSION LOW yes yes Limit value reflection Contact closes when upper limit exceeded R...

Страница 59: ...OPEN 2 3 1 TEST S CLOSED Switches the switching contact on off NOTE With safety inquiry because current output is accessed direct 2 4 0 FIRMWARE 2 4 1 MASTER Display Display of master firmware version...

Страница 60: ...scribed in Sect 8 2 and 8 3 Press key to display the actual value of the current output terminals 31 and 32 in mA Terminate test by pressing the key Fct 2 2 2 TEST I A milliamperemeter should be conne...

Страница 61: ...ssages during measurement 8 8 1 Different kinds of messages a Pointers operating conditions during measurement provided by 6 markers in the 3rd bottom line of the display see Sect 8 8 2 b Application...

Страница 62: ...result in uncertain incorrect measured values or the error message NO M VALUE see Sect 8 8 3 4 No measured value as yet Evaluable measured values not available after the device has been started up Me...

Страница 63: ...tank spectrum does not match the changed operating parameters Remedy record new empty spectrum Fct 3 5 2 yes no no no no no NO DISP Configuration faulty Reset parameters for the displayed units Fct 3...

Страница 64: ...lure lasting up to several minutes it is possible that LINE INTERRUPT will be displayed In such a case measurement is continued subsequently taking into account the history prior to the interruption 8...

Страница 65: ...ect 7 8 BM 70 M current output board or connected receiver instruments defective Test current output as described in Sect 8 7 3 All tests OK Check receiver instruments and replace if necessary Test re...

Страница 66: ...ke Error List see Sect 8 8 also for cause and elimination If also one or several markers are ON see Sect 8 8 2 DA2 Display and current output supply a largely constant measuring error of approx 19 cm...

Страница 67: ...in Sect 6 1 2 DA8 Display and signal output indicate zero measured value marker 5 is ON Tank with dished bottom tank is more than 20 full the BM 70 M is mistakenly located in the tank bottom detectio...

Страница 68: ...occurs mostly with slow changes in level when sources of interference are located in the upper part of the tank Avoid all sources of interference in the upper part of the tank A bigger antenna might h...

Страница 69: ...is activated measurements suspended frozen Deactivate digital input see Sect 4 8 Device located in block distance detection range Check conditions for block distance detection see Sect 8 6 14 M4 mark...

Страница 70: ...e configuration each unit is supplied with the intuitive and time tried software PC CAT for Windows PC CAT provides a number of useful features including Quick on site configuration Print out of confi...

Страница 71: ...l gauge All graphs and screens can be exported a word processing systems or other programs The customer s PC containing PC CAT is connected to the current output via the supplied PC adapter max distan...

Страница 72: ...er on the signal converter in the hazardous area make absolutely certain that there is no explosion hazard Allow the prescribed waiting time of 10 minutes to elapse first 1 Unscrew sunshade SD if fitt...

Страница 73: ...r line circuit III Overvoltage category for the output circuit II Insulation contamination level 2 inside the device Disconnecting device miniature fuse Type BM 70 M level gauges do not feature any de...

Страница 74: ...rical connection to be in conformity with VDE 0165 Section 5 6 or equivalent national regulations Before making the electrical connection make sure all cables leading into the BM 70 M Ex are disconnec...

Страница 75: ...BM 70 M 75 10 Certificates and approvals 10 1 Declaration of Conformity...

Страница 76: ...3 140 mm Type 1 74 mm Type 2 100 mm for stilling well dia Wave Stick Wave Guide length Antenna extension Power supply 24V DCAC 200 240V AC 100 120V AC Signal output Current output active Ex e Ex i pa...

Страница 77: ...onment NE 21 NAMUR recommendation Electromagnetic compatibility EMC of industrial process and laboratory control equipment 1998 08 DIN EN 61010 1 VDE 0411 part 1 1993 04 Safety requirements for electr...

Страница 78: ...x i switching output or PROFIBUS PA or FF Variant 3 RS 485 Krohne protocol or ModBus with current output Variant 4 PROFIBUS PA Ex i also combined with Var 2 or Ex i switching output Variant 5 Foundati...

Страница 79: ...Data FF interface as for PROFIBUS PA Local display Current output error signal 2 mA Ex i 3 6 mA or 22 mA Switching output open or close contact Signal on alarm Digital interfaces error flags only wit...

Страница 80: ...pray periods 2 hours storage 7 days at 40 C RH 93 acc GL Ingress protection Signal converter IP 66 IP 67 equivalent to NEMA 6 6X Shock resistance Impact test in conformity with EN 61010 Section 8 2 wi...

Страница 81: ...ne recommended for current output 100 m Ex equipotential bonding U clamp terminal max 4 mm at neck of signal converter Electrical connection Rated temperature of cables 70 C 80 C for Tamb 55 C or flan...

Страница 82: ...C 5 Ambient temperature range unassigned standard temperature range from 20 C to 60 C 6 Territorial application for explosion protection certification E Europe EC CENELEC 7 Safety function Ex explosio...

Страница 83: ...BM 70 M 83 Annex C Spare parts...

Страница 84: ...84 BM 70 M...

Страница 85: ...BM 70 M 85...

Страница 86: ...le or water endangering liquids you are kindly requested to check and ensure if necessary by rinsing or neutralising that all cavities in the instrument are free from such dangerous substances Directi...

Страница 87: ...10027 21 00 GR Variable area flowmeters Vortex flowmeters Flow controllers Electromagnetic flowmeters Ultrasonic flowmeters Mass flowmeters Level measuring instruments Communications engineering Engi...

Страница 88: ...I O functions 9 4 2 Marking of flange systems 9 5 Assembly and installation 10 5 1 Flange systems 10 5 1 1 Flange system V96 SA optionally with sensor connection 10 5 1 2 Flange system V96 with heatin...

Страница 89: ...with its boundary conditions be observed Note Assembly installation start up and maintenance work may only be carried out by personnel who have been specially trained in explosion protection 2 Safety...

Страница 90: ...ected signal converter are described below 3 1 1 Category Zone allocation The signal converter part of the BM 70 M EEx level gauges is basically designed in Category 2 for application in Zone 1 3 1 2...

Страница 91: ...Li negligible Interface Profibus PA 1 EEx ia IIC or EEx ib IIC IIB Ui 30V Ii 300mA Ci 5nF Li negligible Interface Fieldbus FF 1 EEx ia IIC or EEx ib IIC IIB Ui 30V Ii 300mA Ci 5nF Li negligible 1 sui...

Страница 92: ...temperature Tm Accordingly at a given maximum ambient temperature Tamb 60 C and a given maximum loss power we obtain maximum surface temperatures as a factor of the product temperature For that reaso...

Страница 93: ...ture C T6 60 85 55 100 T5 60 95 40 125 45 120 50 110 55 105 T4 T1 60 95 heat resistant cable required min 80 C Device versions BM 70 M EEx SA Temperature class Ambient temperature C Maximum flange tem...

Страница 94: ...type code is described in Section 2 4 1 Marking Signal Converter The signal converters are identified by means of the nameplates reproduced below 4 1 1 Signal converter without intrinsically safe I O...

Страница 95: ...on info Power voltage with conformity Version number Serial number Inscription as re quested by customer Safety info Type terminal marking and intrinsically safe signal outputs 4 2 Marking of flange s...

Страница 96: ...flange 5 1 3 Flange system V96 SA with purging system and or sensor connection The locking screw for the purging system and or for the sensor connection forms together with the screw thread of the tan...

Страница 97: ...rd e g EN 60079 14 Where elevated product temperatures are concerned see also Section 3 3 2 Temperature classes use heat resistant cables with a continuous service temperature of 80 C in conformity wi...

Страница 98: ...t active 2 RS485 interface current output active 3 BM 70 M See Section 3 1 4 1 only for connection to circuits with functional extra low voltage with safety separation PELV Intrinsically safe I O func...

Страница 99: ...glass window of the electronics compartment without opening the housing or digitally via the signal output 8 Preventive maintenance 8 1 Signal Converter The signal converter is maintenance free under...

Страница 100: ...dismantling work will need to be coordinated with field conditions e g check for presence of a flammable liquid and or potentially explosive atmosphere in or at the tank pressurized tank and is the r...

Страница 101: ...ocess connections and the tank are non pressurized Caution On pressurized tanks do not remove the 4 screws H connecting the wave guide window to the tank mounting flange refer to diagram in Sec 9 1 DA...

Страница 102: ...16 BM 70M EEx BM 70Mi EEx 11 Approvals...

Страница 103: ...BM 70M EEx BM 70Mi EEx 17...

Страница 104: ...18 BM 70M EEx BM 70Mi EEx...

Страница 105: ...BM 70M EEx BM 70Mi EEx 19...

Страница 106: ...20 BM 70M EEx BM 70Mi EEx...

Страница 107: ...BM 70M EEx BM 70Mi EEx 21...

Страница 108: ...22 BM 70M EEx BM 70Mi EEx...

Страница 109: ...flammable or water endangering liquids you are kindly requested to check and ensure if necessary by rinsing or neutralising that all cavities in the instrument are free from such dangerous substances...

Страница 110: ...burg TEL 49 0 203 301 0 FAX 49 0 203 301 389 e mail krohne krohne de India KROHNE Marshall Ltd A 34 35 M I D C Industrial Area H Block Pimpri Poona 411018 TEL 91 0 20 744 20 20 FAX 91 0 20 744 20 40 e...

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