MBA100 User Manual, 2022-02, number 8011706, page 2/4 MBA Instruments GmbH
1. Safety instructions
Use in potentially explosive atmospheres
The type MBA100 level indicator can only be used in potentially explosive
atmospheres if the individual equipment specification permits this.
•Check device by means of type plate and accompanying papers with
regard to approvals (ATEX / CSA).
•Observe the stipulations of the approvals.
•Install with equipotential bonding.
•Avoid sparking through striking of metal parts.
•Carry out the installation per standard EN 61241-14
•Observe the stipulations of the EC type test certificate.
In the event of any doubts regarding the suitability of the
device for a particular application: Contact the manufacturer!
Electrical connection
WARNING: Open contacts inside the device
The electrical contacts inside the device are not protected
against accidental contact. Switch off any signal voltage that may be
connected externally before opening the head of the device.
•Have the device installed and commissioned only by specialists
•The connection diagram is located inside the cover.
•Only use connecting cable that is suitable for the cable inlets.
•The device head and the cable inlets must be closed during operation.
Responsibility of the operator
•Only use the device in such a way as described in these operating
instructions. The manufacturer accepts no responsibility and provides no
warranty for any other use.
•All local laws, technical regulations and company-internal operating
instructions that apply in the locale where the device is used, are to be
observed in addition to these operating instructions.
•Do not remove, insert or alter any components in or on the device insofar
as this is not described and specified in official information from the
manufacturer.
•In potentially explosive areas: Observe European standard EN 61241-14
before installation or operation.
•Observe the specifications regarding voltage and temperature on the type
plate.
2. Functional principle
Membrane switches are employed as limit switches for all types of bulk
solids. The device is only to be used for fixed installation in industrial
systems (large-scale tools). Primarily these would be employed as simple
detectors on conveyor belts, transfer stations, downpipes and anywhere
that a measurement device cannot project into the container.
The product rising in the container presses against the membrane and with
the help of a transfer mechanism a microswitch is actuated. The MBA100
works in a purely mechanical manner and requires no auxiliary power.
3. Dimensions
Hole circle: 189 mm
Bolt holes: 6
Hole diameter: 7 mm
Membrane diameter: 175 mm
For special flange sizes see additional drawing.
4. Installation
The MBA100 is installed on a silo mounting flange. In doing so the
membrane should be connected as flush as possible with the inner wall of
the silo. The flange surfaces of the MBA100 and the container flange are
sealed with the accompanying flat gasket. The fastening of the flange is
implemented with 6 bolts with a diameter of 6mm. When mounting onto a
coupling adaptor care must be taken to ensure that the pressing force of the
bulk solids on the membrane is sufficient to guarantee the MBA100
switching reliably. The maximum length of an adaptor depends on the
properties of the bulk solids. It is essential that no cavities occur in the
adaptor when filling. The membrane requires a pressing force of approx. 6
g/cm2to switch.
Gasket
"Full" sensor
"Empty" sensor
in the adaptor!
