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KROHNE BM 70 A Instructions Manual
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KROHNE BM 70 A Instructions Manual

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DIN: 7.02225.31.00
© KROHNE 06/1997
US: 7.02225.71.00
GR/OP
Condensed instructions
Level-Radar
BM 70 A
Variable area flowmeters
Vortex flowmeters
Flow controllers
Electromagnetic flowmeters
Ultrasonic flowmeters
Mass flowmeters
Level measuring instruments
Communications engineering
Engineering systems & solutions

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Summary of Contents for KROHNE BM 70 A

  • Page 1 DIN: 7.02225.31.00 © KROHNE 06/1997 US: 7.02225.71.00 GR/OP Condensed instructions Level-Radar BM 70 A Variable area flowmeters Vortex flowmeters Flow controllers Electromagnetic flowmeters Ultrasonic flowmeters Mass flowmeters Level measuring instruments Communications engineering Engineering systems & solutions...

  • Page 2: Table Of Contents

    The BM 70 A level gauge is designed solely for measuring the level, distance, volume and reflection of liquids, pastes, slurries, particulate materials and solids. The BM 70 A level gauge does not form part of an overfill protection system as defined in WHG.

  • Page 3: Installation

    PTFE antenna, as this may cause the rod to bend. 2. Installation 2.1 Field assembly Most of the BM 70 A versions are supplied in fully assembled condition. However, if a device should be delivered in parts, or parts are subsequently replaced, the following should be noted.

  • Page 4: Mechanical Installation

    Zone 0, 1 and 2 hazardous locations (Wave-Stick: Zones 1, 2 to PTB, Zone 0 to SEV). • The BM 70 A Ex is approved for use in dust locations of Zones 10 and 11 (but not the Wave-Stick). • Attention is drawn to the information given on the nameplate and the specifications in the approval certificates.

  • Page 5: Electrical Connection

    Ultimate installation on the tank • Do forget gasket when positioning the BM 70 A on the tank nozzle flange. Align BM 70 A and gasket, slightly tighten nuts on stud bolts (by hand). • Press shielding strip C* in the gap...
  • Page 6 T 2 A 18-26.4 V AC 115/230 V AC switch-selectable between: 85-127 V AC or 115 V AC: min. T 0.5 A 170-254 V AC 230 V AC: min. T 0.25 A .52+1( BM 70 A Kurzanleitung Seite: 6 4. Entwurf 03/97...
  • Page 7 RS485 version (Ex-e): QRQFRPPXQLFDEOH Strom- Strom- nicht belegte ausgang ausgang Anschlüsse 32 31 B B A A 32 31 4-20mA max.250 Ω 4-20mA max.250 Ω RS 485 RS 485 Eingang Ausgang .52+1( BM 70 A Kurzanleitung Seite: 7 4. Entwurf 03/97...
  • Page 8 Class of protection The BM 70 A level gauge is designed for safety class 1 in conformity with VDE 0106 Part 1. 24 V DCAC supply When connected to a “functional extra-low voltage with safety separation“ power source (SELV or PELV) in accordance with VDE 0100, Part 410 or equivalent (inter)national regulations, connection of a safety conductor (PE) is not required.

  • Page 9: Setting Parameters

    The table on the following 2 pages provides an overview of all parameters that can be set in the configuration menu. This is followed by more precise explanations of some functions and a typical configuration. .52+1( BM 70 A Kurzanleitung Seite: 9 4. Entwurf 03/97...
  • Page 10 10 characters conversion table. 3.2.5 ERROR MSG. Select NO/YES Select whether error messages to be shown in display.. SIG.OUTP. 3.3.1 FUNCTION I Select function of the current output. Select OFF/LEVEL/ .52+1( BM 70 A Kurzanleitung Seite: 10 4. Entwurf 03/97...
  • Page 11 Value 0.00 [m] ... tank height Enter hysteresis for the switching 0.00 ... 99999.99 [m contact. 0 ... 100 [Refl.] Default values are shown in bold type in the table. .52+1( BM 70 A Kurzanleitung Seite: 11 4. Entwurf 03/97...
  • Page 12 The tank height (Fct. 3.1.1) for the BM70 A is defined as the distance between the top edge of the tank connecting flange and the bottom reference point. The bottom reference point is that “point“ in the tank on which the microwaves of the BM 70 A impinge and from which they are reflected.
  • Page 13 Conversion table/Volume table A table consisting of a maximum of 50 points can be stored in the BM 70 A for non- linear or linear conversion of the level, e.g. into a volumetric value. This table, however, can only be programmed with the PC-CAT program.
  • Page 14 Section. If the device no longer contains the default parameters, the keystroke combination for entering the numerical values may differ. Activity Keys to be Content of BM 70 A actuated display after activity carried out ‰...

  • Page 15: Maintenance, Error Handling

    - or that there is no explosion hazard (gas-free certificate!). Replacement of the signal converter Before commencing, note down the parameters of the BM 70 A and switch off power source! 1. Detach safety lock at terminal compartment using Allen key (size 4 mm) and unscrew cover from terminal compartment using the special wrench.
  • Page 16 .52+1( BM 70 A Kurzanleitung Seite: 16 4. Entwurf 03/97...

  • Page 17: Technical Data

    Fatal errors (FATAL ERROR), that are detected when the device is started up, render operation of the BM 70 A impossible. 6. Technical data (extract) Tank height (measuring range) 0.5 to 40 m (Wave-Stick up to 20 m); larger on request Measuring accuracy (distance) Standard: from 1m: + 1 cm / from 3.3m: + 0.3%...
  • Page 18 (point-to-point or multidrop) RS 485 interface Transmission rate 1200, 2400, 4800, 9600, 19200 or 38400 bauds Protocols Krohne protocol; ModBus RTU, HART Additional current output 4 - 20 mA active (load impedance < 250 ohms) Ambient conditions Environment class Locations exposed direct to open-air climate,...

  • Page 19: Safety Information

    7. Safety information Insulation rating The insulation of type BM 70 A level gauges is rated in conformity with VDE 0110/01.89, equivalent to IEC 664, and takes into account the following ratings: • overvoltage category for the power line circuit: III •...