KROHNE BM 70 A Instructions Manual Download Page 7

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BM 70 A Kurzanleitung

Seite: 7

4. Entwurf 03/97

Signal output variants

Variant

Comments

Ex-e current output HART

Ex-e; with switching output and digital input

Ex-i current output HART

intrinsically safe; passive

Current output

Ex-e; not communicable

RS 485 + current output

BM70 A protocol or ModBus-RTU; Ex-e

PROFIBUS FMS/DP

RS485 interface; Ex-e; see Add’l Instructions

PROFIBUS PA

intrinsically safe; see Add’l Instructions

Terminal assignment

Supply power:

Ein- und Ausgänge

+(-)

-(+)

24V DC

24V AC

Ein- und Ausgänge

Connections for 115/230 V AC

Connections for 24 V DC/AC (any

polarity)

Connection of a functional ground FE is not
mandatory.

Current output HART

, Ex e:

Ex-i current output HART

32 31

42 41

Strom-
ausgang

Schaltausgang

max. 100mA/30V DCAC

Digital-
Eingang

82 81

- +

5...28V=

4-20mA

max.500

Ω

32 31

Ex-i-Speise-

für externe

Einheit

U max.= 30V

Ex-i-Kreise

Strom-
ausgang

4-20mA

U min.= 8V

The

4 other terminals can be used for looping-through

external intrinsically safe circuits.

Current output

QRQFRPPXQLFDEOH

RS485 version (Ex-e):

32 31

Strom-
ausgang

- +

nicht belegte

Anschlüsse

4-20mA

max.250

Ω

RS 485
Eingang

RS 485
Ausgang

32 31

Strom-
ausgang

- +

4-20mA

max.250

Ω

Summary of Contents for BM 70 A

Page 1: ...ollers Electromagnetic flowmeters Ultrasonic flowmeters Mass flowmeters Level measuring instruments Communications engineering Engineering systems solutions Condensed instructions Level Radar BM 70 A GR OP DIN 7 02225 31 00 KROHNE 06 1997 US 7 02225 71 00 ...

Page 2: ...operation of our level gauges may lead to loss of warranty In addition the General conditions of sale forming the basis of the purchasing contract are applicable If you need to return the level gauge to the manufacturer or supplier please refer to the information given in Section 5 Items included with supply The scope of supply encompasses in the version as ordered Signal converter bolted to waveg...

Page 3: ...should be delivered in parts or parts are subsequently replaced the following should be noted For any necessary field assembly of the BM 70 A all parts are included with the supply stud bolts washers etc Bolt the waveguide window flange mount or distance piece if supplied loose to the BM 70 A Torque for the sets of 4 Allen screws M key size 5 mm max 8 Nm 0 8 kpm 5 8 ft lbf Note Ensure the upper Te...

Page 4: ...ion given on the nameplate and the specifications in the approval certificates Safety Surface temperature The housing of the signal converter can in extreme ambient conditions assume temperatures of more than 70 C Check material compatibility of antenna extension flange gaskets and PTFE used in all versions with the product Mounting on the tank nozzle Devices with horn antenna The antenna should p...

Page 5: ...nd Press shielding strip C in the gap between tank and BM 70 A flanges and secure with strap retainer S both items included with supply Strap retainer S must fit closely and overlap both flanges only required for European radio approvals Tighten down stud bolt nuts firmly The tightening torque is dependent upon the strength properties of the stud bolts and the pressure rating of the tank C shieldi...

Page 6: ... 4 Entwurf 03 97 Variant Voltage range Recommended fuse protection for cables 24 V DCAC 18 31 2 V DC or 18 26 4 V AC min T 2 A 115 230 V AC switch selectable between 85 127 V AC or 170 254 V AC 115 V AC min T 0 5 A 230 V AC min T 0 25 A ...

Page 7: ... 1 2 24V DC 24V AC FE Ein und Ausgänge Connections for 115 230 V AC Connections for 24 V DC AC any polarity Connection of a functional ground FE is not mandatory Current output HART Ex e Ex i current output HART 32 31 42 41 Strom ausgang Schaltausgang max 100mA 30V DCAC Digital Eingang 82 81 5 28V 4 20mA max 500 Ω 32 31 Ex i Speise für externe Einheit U max 30V Ex i Kreise Strom ausgang 4 20mA U m...

Page 8: ... contact voltage if due to protective measures in conformity with VDE 0100 a safety conductor PE is stipulated it must be connected to the separate U clamp terminal in the terminal compartment of the signal converter Equipotential bonding When used in hazardous areas the BM 70 Ex A must be incorporated in the PA equipotential bonding system irrespective of the type of power supply If the PA is con...

Page 9: ... column on the right select key branches the menu to the next digit on the same level changes the content digit text character at the cursor position ENTER key branches the menu to the next higher level stores newly entered parameters executes displayed functions selects special functions e g error memory see Sect 5 The cursor position is signalled by flashing of the character or the option at the...

Page 10: ... Enter block distance non measurable range below bottom edge of flange see explanatory notes 3 1 3 ANTENNA Select STANDARD WAVE STICK Select antenna type 3 1 4 ANT EXT Enter 0 00 m tank height Enter length of antenna extension 3 1 5 DIST PCE Enter 0 2000 mm Enter length of distance piece above flange 3 1 6 STILLWELL Select NO YES If YES enter 25 200 mm Selection without or with still well With sti...

Page 11: ...ination of tank height see explanatory notes 3 5 2 EMPTY SPECT Select OFF ON RECORD Recording the profile of the empty tank empty tank spectrum see explanatory notes 3 5 3 TIMECONST Value 1 10 100 s Enter time constant for measured value filtering 3 5 4 TRACING VEL Value 0 01 0 50 10 00 m Min Enter the maximum rate of change in level that can occur in operation 3 5 5 MULT REFL Select NO YES Switch...

Page 12: ...usible Block distance The block distance function Fct 3 1 2 defines a zone below the top reference point in which measurements are not meant to take place The value should be at least 10 20 cm greater than the length of antenna antenna extension or at least 20 cm in the case of the Wave Stick Signals within the block distance are suppressed a rise in the tank filling above this limit response thre...

Page 13: ...ressing To record use the key to select one of the following options MAX VALUES only maximum values are taken into account when the empty tank spectrum is recorded useful e g with difficult agitators AVERAGING values are averaged this setting can be used for most applications After selecting with the key press the key to select COMPLETE or the key to select PARTIAL When COMPLETE is selected the em...

Page 14: ...ock distance 0 60 m 0 6000 m Confirm block distance and move to current output configuration Fct 3 3 Sig output Move to lower range value Fct 3 3 3 Scale 4 mA Display default value 00 000 m Enter lower range value 0 4 m 4 mA 3x 4x 00 400 m Confirm lower range value and move to full scale range value Fct 3 3 4 Scale 20mA Display of default value 010 00 m Enter full scale value 4 0 m 20 mA 2x 9x 4x ...

Page 15: ...the special wrench If a sunshade option is fitted remove this first 2 Disconnect all cables from the terminals in the terminal compartment 1 Remove the 4 Allen screws M Allen key size 5 mm and lift off the signal converter The flange unit incl waveguide window will remain tight even with pressurized tanks Caution On pressurized tanks do not on any account remove the 4 screws H connecting the wave ...

Page 16: ... 52 1 BM 70 A Kurzanleitung Seite 16 4 Entwurf 03 97 obligated to check and ensure that all cavities in the device are free from such dangerous substances ...

Page 17: ... Standard from 1m 1 cm from 3 3m 0 3 BM 70 Precision from 1m 5 mm from 5m 0 1 Measured value resolution 1 mm Rate of change in level max 10 m min tracking speed Connecting flanges Horn antenna Wave Guide DIN 2501 DN 50 to DN 200 PN 6 to PN 64 Shape C to DIN 2526 or others ANSI B16 5 2 to 8 Class 150 lbs or 300 lbs RF Wave Stick Only DN 50 150 or ANSI 2 6 dairy DIN11851 DN60 65 80 Triclamp 2 3 4 SM...

Page 18: ... 4 20 mA without or with error message 2 mA or 22 mA Accuracy and linearity 0 05 Load impedance 500 ohms Digital communication HART point to point Switching output passive only in conjunction with current output HART Contact type 1 N O electronic Contact rating max 30 V DC 30 V AC 100 mA Digital input only in conjunction with current output HART External voltage 5 to 28 V DC Internal resistance 1 ...

Page 19: ...roof Enclosure d for the terminal compartment Consult the relevant wiring and installation regulations e g VDE 0165 before mounting dismantling or making electrical connections in the hazardous location Before making the electrical connection make sure all cables leading into the BM 70 A Ex are disconnected from supply In the BM 70 A version with an intrinsically safe current output only equipment...

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