KROHNE BM 70 A User manual

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Condensed instructions
Level-Radar
BM 70 A
GR/OP
DIN: 7.02225.31.00
©
KROHNE 06/1997 US: 7.02225.71.00

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Table of contents:
1. Transport and storage
2. Installation
2.1Fieldassembly
2.2 Mechanical installation
3. Electrical connection
4. Setting parameters
5. Maintenance, error handling
6. Technical data
7. Safety information
Product liabilityand warranty:
The BM70 Alevel gauge is designed solely for measuring the level,distance,
volume and reflection of liquids, pastes, slurries, particulate materials and solids.
The BM70 Alevel gauge does not formpart of an overfill protection systemas
defined in WHG.
Special codes and regulations apply to its use in hazardous areas.
Responsibilityastosuitabilityand intended use of these level gauges rests solely
with the user.
Improper installation and operation of our level gauges may lead to loss of warranty.
In addition, the "General conditions of sale", forming the basisof 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 waveguide windowand antenna; optionally: antenna
extension, sunshade (with fastening material in each case)
•Shielding material with tightening strap
•Device documentation (installation and operating instructions) plus instruction
card, and also these condensed instructions
•Report on factory settings for the signal converter
•Certification and approval documents, unless reproduced inthe device
documentation
•Bar magnet for operator control
•Wrench for covers
Installation material (stud bolts, flange gasket and cabling) not supplied, to be
provided by customer!

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1. Handling and storage
Safety advice
Depending on the version, the device will weigh between approx. 16 kg and 30 kg.
To carry, use both hands to lift the device carefully by the converter housing. If
necessary, use lifting gear.
When handling the BM 70 A, avoid hard blows, jolts, impact, etc.
When storing the "Wave-Stick" version, make sure that the device is not placed on
its side on the 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.
•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 Teflon plug is
kept absolutely dry and clean! Moisture
and dirt will impair functionability of the
BM 70 A!
•Bolt antenna extension to the antenna;
torque for the 3 stud bolts A: max. 8 Nm ∼
0,8 kpm (5.8 ft lbf).
Do not detach bolts H !
Distanzstück
(für Hochtemperatur-
Ausführung bis 250°C)
oberer Teflonstopfen
O-Ring
unterer Teflonstopfen
O-Ring
BM70
Anschlussflansch
Messumformer
Antennenverlängerung
Antenne
M
HM
A

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2.2 Mechanical installation
Hazardous-duty systems
•The BM 70 A Ex is certified in conformity with European Standard for use in
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.
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 project out of the nozzle. If necessary, use an antenna
extension.
Tankstutzen
Tankstutzen Antennen -
Verlängerung
Wave-Stick
Note the requirements imposed on nozzle diameter and nozzle length:

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min. 50 mm
min. 235 mm
Tankstutzen
Ausführung SW
für Schwallrohre
Ø 40...55 mm
z.B. DN50
Purging device
Remove screw plug ¼" R and screw in
screwed tube joint, e.g. Ermeto ¼" R.
Consult “Ex“ specifications relating to
the purging circuit (connection provided
by customer)!
Ultimate installation on the tank
•Do not forget the 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
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* = shielding strip B = BM 70 A flange
S* = strap retainer F = tank flange
3. Electrical connection
To open the terminal compartment of the signal converter, first open the safety lock
with an Allen key (size: 4 mm) and then use the enclosed special wrench to turn the
cover anticlockwise.
Supply power variants

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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

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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:
NL
PE
~~
NL
Ein- und Ausgänge
12
+(-) -(+)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 min.= 8V
The 4 other terminals can be used for looping-through
external intrinsically safe circuits.
Current output QRQFRPPXQLFDEOH : RS485 version (Ex-e):
32 31
Strom-
ausgang
-+
nicht belegte
Anschlüsse
-
+
4-20mA
max.250 Ω
BBAA
RS 485
Ein
g
an
g
RS 485
Ausgang
32 31
Strom-
ausgang
-+
-
+
4-20mA
max.250 Ω

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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.
115/230 V AC supply
Connection to a power source with dangerous 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 connected via a separate conductor, this must be connected to the separate U-
clamp terminal at the “neck“ of the BM 70-Ex A. Cancellation of equipotential
bonding is only permitted when the BM 70 A is disconnected from supply.
Rated temperature of connecting cables: see Section 7.

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4. Setting the parameters
Local display
Function of keys
Operator control via the keys: For reasons of electrical safety, the keys (below the
display, when housing is open) may only be actuated for servicing and repair work
by specialist personnel, on no account, however, when there is risk of explosion!
Operator control can be carried out with the aid of the supplied bar magnet without
opening the housing. However, a particularly convenient form of parameter setting is
offered by the PC program PC-CAT (special accessories), which allows input via
masks at the computer: see PC-CAT user manual.
 (cursor key): - selects the configuration menu,
- branches the menu to the next lower level,
- shifts the cursor* to the next 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 appropriate place.
Description of functions
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.
 Numeric display, measured values
ó Alphanumeric display, function/unit
ì 6 Markers to display measurement
status
ö 3 keys for configuration and error
interrogation
ú Magnetic sensors for operator control
through the closed housing (function
same as the 3 keys)
÷ Compass field, indicates actuation of a
key

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Configuration menu (Version 3.00)
Function (Fct.) Input range Description
1.0 OPERATION
1.1 DISPLAY
1.1.1 FCT.DISP identical with 3.2.1
1.1.2 UNIT.LENGTH identical with 3.2.2
1.1.3 UNIT.CONV. identical with 3.2.3
2.0 TEST
2.1 HARDWARE
2.1.1 MASTER Master hardware test.
2.1.2 DISPLAY Display hardware test.
2.1.3 STATUS Status information for Service
2.2 CUR.OUTP.I
2.2.1 VALUE I Value display Display of actual value of the current
output.
2.2.2 TEST I Select 2 mA/4 mA/6 mA/...
... 20 mA/22 mA Output of selected value to the current output. With safety query.
2.3 SW.OUTP.
2.3.1 TEST S Select OPEN/CLOSE Switch switching contact on/off.
With safety query.
2.4 FIRMWARE
2.4.1 MASTER Display Display of master firmware version.
2.4.2 DISPLAY Display Display of display firmware version.
3.0 INSTALL.
3.1 BASIC.PARAM
3.1.1 TANKHEIGHT Select unit m/cm/mm/
inch/Ft
Enter
0.00 [m] ... max. tank height
Enter tank height (see explanatory
notes).
The unit entered here is also used for
all other length entries.
3.1.2 BLOCKDIST Enter 0.10 [m] ... tank height 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 still well: enter inside diameter in
[mm].
3.1.7 REF.OFFSET Enter -10.00...0...+10.00 [m] Reference offset (special function).
3.1.8 TKB.OFFSET Enter -100.00...0...+100.00 [m] Tank bottom offset (special function).
3.2 DISPLAY
3.2.1 FCT.DISPLAY Select LEVEL
DISTANCE
CONVERSION
REFLECTION
Select function of display
(value to be displayed).
3.2.2 UNIT.LENGTH Select m/cm/mm/
inch/Ft/
PERCENT/BARGRAPH
Select unit for length value to be
displayed (only for level and distance).
3.2.3 UNIT.CONV. Select m3/l(Liter)/US Gal/
GB Gal/Ft3/bbl/PERCENT/
BARGRAPH/USER UNIT
Select unit for conversion value to be
displayed (“volume table“).
(see explanatory notes)
3.2.4 USER UNIT Text entry 10 characters Enter user-defined unit for the
conversion table.
3.2.5 ERROR MSG. Select NO/YES Select whether error messages to be
shown in display..
3.3 SIG.OUTP.
3.3.1 FUNCTION I Select OFF/LEVEL/Select function of the current output.