Product Description; Unit Components; Principle Of Operation; Optional Equipment - MBA Instruments MBA200 Operating Instruction

2

Product description

Unit components

2.1
1. Unit head: contains
drive and electronic components.
Three different types available.
2. Process connection: thread
flange. Attached to the outer wall
of the bulk materials container.
Holds the unit head on the
outside and the protective tube (if
provided) on the inside. Many
versions available for individual
adaptation to the actual container.
3. Shaft: Connects the paddle to the
unit head. Various
available (large sizes divided in
two sections) and a flexible steel cable as the shaft.
4. Paddle: Stops the shaft rotation when the bulk material
surrounds the paddle. Solid/flexible/foldable
available with different size or material.
5. Protective tube (option): Covers the shaft inside the
container. Various lengths available. Versions: open tube
for vertical mounting (great lengths delivered in two
sections); tube for horizontal mounting with additional
shaft bearing at the end; angled shaft bearing with
horizontal tube and a vertical shaft.

Principle of operation

2.2
The electric motor in the head makes the shaft and the
paddle rotate slowly. When the bulk material surrounds the
paddle, the rotation is blocked. The counter-torque is used to
turn the motor mechanism against a switch which then turns
the motor off. The switch has a second contact (potential-
free) which is used for the status indication.
As soon as the bulk material releases the paddle again, a
spring pulls the motor mechanism back into the working
position. Thus the switch is released and the paddle starts
rotating again.
The motor mechanism requires approximately 3 seconds to
indicate stopping or restarting of the paddle (switching delay
due to the mechanical sequence).
Additional indication delay can be effected by
● the characteristics of the bulk material
● torsion effects (e.g. cable shaft, rubber paddle)
electronic switching delay ( page 9, § 3.5)
●

Optional equipment

2.3
General options
Special seal (DTR): Protection against gases, vapours,
●
and abrasive bulk materials.
Compensating membrane:
●
diffusion of water-vapour and thus can balance out the
humidity inside the unit head. Moreover, the membrane
will burst if the pressure inside the unit head increases
strongly due to operational trouble, which allows the use
on containers with an internal pressure up to +1 MPa
(option »10 bar«).
● Heating in the unit head: Allows use at low ambient
temperatures.
Height adjustment: A clamping sleeve which guides the
●
protective tube of the extension arm and allows fixating
the extension arm at variable insertion depth.
Electronic options (only for type 220 and 230)
● Action monitoring:
monitors the shaft rotation. The error status is indicated
by means of a relay contact.
Indicating LED light: Indicates the current status.
●
3
the motor
1
or
2
3 5
4
lengths
Membrane which
A Hall sensor in the unit head
MBA200 · Operating Instructions 8011417 V 2.2 · © MBA Instruments GmbH Germany

Appropriate use

2.4
Range of application
MBA bin level indicators are rugged electromechanical
sensors, designed to detect the presence of bulk material at
the place of installation and thus to control the filling of bulk
material containers. Possible applications depend on the
configuration of the individual unit.
Bin level indicators of the MBA200 series can be used with
industrial
substances. MBA units may not be affected by chemical
aggressive gases or fluids.
WARNUNG: Explosion hazard
A MBA200 bin level indicator may only be used in
explosion-hazardous locations if the individual
specifications of the unit complies with this use.
Check nameplate and accompanying papers.
Check whether the specifications of the EC-Type
Examination Certificate must be complied with ( page 13,
§ 7.6).
versions
If there is any doubt whether the unit may be used for
the desired application or not: Ask the manufacturer.
Design options
Variable design features are, for example:
● Paddle design, size, and material
Shaft design and material
●
Sealing of shaft against enclosure
●
The corresponding properties for the unit can expand or
restrict the range of possible applications (e.g. suitability for
a particular type of bulk material). Please note carefully the
specifications for your particular unit.

Responsibility of the user

2.5
Use the device only as described in these Operating
Instructions. The manufacturer bears no responsibility for
any other use.
In addition to these Operating Instructions, follow all local
laws, technical rules and company-internal operating
directives applicable at the respective installation site of
the equipment.
No components may be removed from, added to or
changed on the device unless this is described and
specified in the official manufacturer information.
In explosion-hazardous locations: Prior to installation and
operation, observe the European standard EN 61241-14.
EN 61241-14: Electrical apparatus for use in the presence
of combustible dust – selection and installation.s
Product versions which are certified for use in explosion-
hazardous locations have been tested and certified
according to EN 61241-0 and EN 61241-
allows
Bin-level Indicator MBA200
bulk materials from organic and mineral