MBA Instruments MBA888 User manual

MBA888
Level Switch
for Bulk Goods
Installation and Operation
MBA Instruments GmbH
Friedrich-List-Straße 3-7
D-25451 Quickborn
GERMANY
Phone [phone]
[e-mail]
www.mba-instruments.de
EN

Operating Instructions MBA888
Operating Instructions MBA888 11/2017/Item No. 8001705 Page 2/6
MBA Instruments GmbH [e-mail]
1. Safety information – for use in explosion-hazardous areas (areas with potentially explosive atmosphere)
A level indicator of type MBA888 may be used in an explosion-hazardous area only if permitted by the
individual device specification.
•Check the device's rating plate in order to establish whether the approval (ATEX) applies.
An approved device will have the following marking:
II 1/2 D Ex ta/tb IIIC T100°C Da/Db
•Follow the regulations specified in the approval.
•Fit an equipotential-bonding lead.
•Prevent sparking as the result of metal parts striking each other.
•Wiring must be performed in accordance with Standard EN 60079-14.
•Follow the regulations of the EC Type-Examination Certificate.
•Comply with zone separation (see below).
•Connect electrical wiring only in a suitable terminal box.
2. User's responsibility
•Use the device only as described in these Operating Instructions. The manufacturer is unable to
assume any liability or warranty for other uses.
•Follow all local legislation, technical regulations and in-company directives applicable to the device's
place of use, in addition to these Operating Instructions.
•The housing cannot be opened.
•Comply with the voltage and temperature specifications on the rating plate.
3. Use
The MBA888 is used as a level switch for all types of bulk goods. The device may be used only for fixed
installation in industrial plant (large machine tools).
4. Conformity:
Explosion Protection, General Requirements ................. IEC 60079-0:2011
Device Dust Explosion Protection by Housing "t" ........... IEC 60079-31:2013
Explosion Protection, General Requirements ................. EN 60079-0:2012
Device Dust Explosion Protection by Housing "t" ........... EN 60079-31:2015
EMC ................................................................................. EN 61000-6-4: Sept. 2011 (industrial applications)
......................................................................................... EN 61000-6-2: Mar. 2006 (industrial applications)
Vibration:......................................................................... IEC 60068-2-6, IEC 60068-2-27
Low Voltage:.................................................................... EN 61010-1: 2011
Protection level Da for
dust Ex zone 20, 21 or 22
max. 80°C
Protection level Db for
dust Ex zone 21 or 22
max. 55°C
Zone separation

Operating Instructions MBA888
Operating Instructions MBA888 11/2017/Item No. 8001705 Page 3/6
MBA Instruments GmbH [e-mail]
5. Function and switching behaviour
A motor rotates a shaft, with a vane secured to the end of the shaft. If the vane strikes the bulk material, a
torque builds up until the shaft stops rotating. The shaft then reverses its direction of rotation. The signal
switches when shaft rotation is blocked in both directions.
"Quick Switch" device design:
On this version, the MBA888 checks whether shaft rotation is blocked in one direction only. This means that the
very fast switching allows the device to be used as a "Full" indicator:
6. Installation
The MBA888 is screwed into a suitable sleeve with the process connection. The installation position must be selected
such that the vane at the end of the shaft is covered by the bulk material at the switching point. Light-weight or fluid
bulk material must cover the vane a little more than is the case with heavy bulk material. Measurement is
independent of the MBA888's installation position.
2. Shaft
stops
3. Shaft
turns CW
4. Shaft stops
Signal switches: "full"
1. Shaft
turns CCW
+3 s +3 s
5. Shaft turns CCW
Signal switches: "empty"
+3 s
2. Shaft
stops
3. Shaft stops
Signal switches: "full
1. Shaft
turns CCW
+1s
4. Shaft stops
Signal switches: "empty"
+1s
light-weight bulk mat.
medium-weight bulk mat.
heavy bulk material
Examples
Washing powder
Barley
Plastic granulate
Quartz sand
Gravel
4 Mounting surfaces for
65 mm width across flats
Tightening torque: 300 Nmm
Screw-in sleeve: G1.5" to ISO 228/1
Container
wall
Equipotential bonding:
for equipotential-bonding
screw with eyelet, d = 4 mm
Container top section

Operating Instructions MBA888
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MBA Instruments GmbH [e-mail]
7. Electrical connection MBA888
7.1 With M12 plug connector
A 5-pin A code M12 coupling connector is required for electrical connection.
The cable must be a fixed installation.
Coupling connector assignment
MBA888**K*-
*00000-*-**
MBA888**A*-
*00000-*-**
24 V DC variant
12 V DC variant
1
Operating voltage
24 V DC ±10%
12 V DC ±10%
2
Shaft Blocked signal:
" Container full"
24 V/0 V, max. 1.2 A
12 V/0 V, max 1.2 A
3
GND
0 V
0 V
4
Shaft rotating signal:
" Container empty"
24 V/0 V, max. 1.2 A
12 V/0 V, max. 1.2 A
5
PE wire
PE wire
PE wire
7.2 With screwed cable gland and cable version
The MBA888 is supplied with a ready-to-use cable. The flexible leads at the end of the cable are numbered
1 to 5 and must be connected in a suitable terminal compartment. The housing is included in the
equipotential-bonding system. The cable must be a fixed installation.
Flexible-lead assignment 5G 0,5
MBA888**K*-
*00000-*-**
MBA888**A*-
*00000-*-**
24 V DC variant
12 V DC variant
1
Operating voltage
24 V DC ±10%
12 V DC ±10%
2
GND
0 V
0 V
3
Shaft Blocked signal:
"Container full"
24V /0 V, max. 1,2 A
12V /0 V, max 1,2A
4
Shaft rotating signal:
"Container empty"
24 V/0 V, max. 1.2 A
12 V/0 V, max. 1.2 A
GN/YE PE wire
8. Electrical connection MBA888 115 … 230 V AC
The MBA888 is supplied with a ready-to-use cable. The flexible leads at the end of the cable are
numbered 1 to 6 and must be connected in a suitable terminal compartment. The housing must
be included in the equipotential-bonding system. The cable must be a fixed installation.
Flexible-lead assignment 7G 0,75
MBA888**L*-*00000-*-**
115..230 V AC variant
1
Operating voltage
115 V … 230 V AC ±10%
2
N
3
Relay main contact
floating
4
Relay main contact 1
Empty indicator
5
Relay main contact 2
Full indicator
GN/YE PE wire
6
not used
The relay switches as a changeover contact. The contacts are floating.
Output signal
Behaviour Cause
Flexible lead
3 – 4
Flexible lead
3 – 5
Shaft rotates
Container is empty
closed
open
Shaft does not rotate
Container is full
open
closed
Safety-related circuit, for use as Full indicator
If the MBA888 detects a malfunction or if the operating voltage fails, the relay drops out and displays status
"Container is full".
1 +24 V DC
2 0 V GND
3 Signal full
4 Signal empty
GN/YE
1 230 V AC
2 N
3
4
5
PE wire
6 GN/YE
4 3
5
1 2
PE
PE
PE

Operating Instructions MBA888
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MBA Instruments GmbH [e-mail]
9. Maintenance
The MBA888 is maintenance-free. Nevertheless, you should regularly check proper functioning of the device at least
once per annum.
10. Operating data
MBA888 24 V DC
MBA888 12 V DC
115 V… 230 V AC
Operating
voltage:
24 V DC
12 V DC
115 V … 230 V AC
Current
consumption:
max. 90 mA
(not including output load)
max. 120 mA
not including output
load)
6 VA
Signal:
24/0 V DC max. 1.2 A
12/0 V DC max. 1.2 A
Floating changeover contact max. 6 A
Connection
cable:
LAPP Ölflex Robust 210 5 G 0.5 mm2
Standard length: 2 m
(other lengths on request)
LAPP Ölflex Robust 210 7 G 0.75 mm2
Standard length: 2 m
(other lengths on request)
With ATEX: Without ATEX:
Temperature in container:-20 to +80°C Temperature in container:-30 to +80°C
Ambient temperature: -20 to +55°C Ambient temperature: -30 to +60°C
Ambient pressure: 0.8 to +1 bar Ambient pressure: 0.8 to +3 bar
Housing enclosure:IP65 – Water-tight and dust-tight
Seals and gaskets: VITON and PTFE gasket
Motor shaft with additional seal (VITON)
Process connection
Housing: Aluminium or stainless steel 1.4305
Switching time
Standard
Quick
Switch
if shaft blocked:
6 s
1 s
if shaft not blocked:
3 s
1 s
Device marking
Ex marking:
II 1/2 D Ex ta/tb IIIC T100°C Da/Db
Type-Examination Certificate: ZELM 15 ATEX 0547 X
11. Rating plate (example)
Serial number:
Please always specify
when submitting
queries/enquiries

Operating Instructions MBA888
Operating Instructions MBA888 11/2017/Item No. 8001705 Page 6/6
MBA Instruments GmbH [e-mail]
MBA Instruments GmbH
Friedrich-List-Straße 3-7
25451 Quickborn
GERMANY
Telefon [phone]
[e-mail]
www.mba-instruments.de