MBA MBA800 User manual

EN
Operating instructions MBA800
Digital Paddle Level Indicator
with ATEX Certification

Paddle Level Indicator Series MBA800
Document information
Document identification
Title: Level indicator series MBA800
Order number: 8011610
Version: 4.0
Dated: 2022-10
Described product
Product name: MBA800
Variations: MBA810, MBA820
Manufacturer
MBA Instruments GmbH
Friedrich-List-Straße 7, GERMANY, 25451 Quickborn
Warranty information
The given product characteristics and technical data do not constitute a
declaration of warranty.
© MBA Instruments GmbH. All rights reserved.
Meaning of the warning symbols
General danger
Danger from electrical voltage
Danger in potentially explosive areas
Danger due to high temperature or hot surfaces
Warning levels
WARNING
Risk or hazardous situation, which could result in severe personal
injury or death.
CAUTION
Hazard or unsafe wpractice, which could result in personal injury or
property damage.
Explanation of the information symbols
Important technical information for this product.
Important information on electrical or electronic functions
Supplemental information
Tip
Content
1Product description ................................................................4
Device components ...................................................................4
Principle of operation.................................................................4
Optional equipment ...................................................................4
Appropriate use .........................................................................4
Responsibility of the user ..........................................................4
Safety information for use in EX locations.................................5
Responsibility of the user ..........................................................5
Conformity: ................................................................................5
2Installation ...............................................................................6
Installation location, protective roof ...........................................6
Assembly ...................................................................................6
Installation .................................................................................7
2.3.1 Operating conditions .............................................................7
2.3.2 Installation position................................................................7
2.3.3 Fastening...............................................................................7
2.3.4 Temperatures of the distance tube .......................................8
Electrical connection..................................................................8
2.4.1 Safety notes for the installation .............................................8
2.4.2 Power cord ............................................................................8
2.4.3 Protection against explosion .................................................8
Wiring diagram MBA810 (115 …230 VAC)...............................9
Wiring diagram MBA820 (24V DC) ...........................................9
MBA820 protective circuit..........................................................9
2.3.1 M12 plug connector (option)..................................................9
Connect output signals..............................................................9
Connect external signal voltage ................................................9
LED functions ..........................................................................10
Setting/adaptation....................................................................10
Switch logic of switching signal ...............................................10
Select function mode ...............................................................10
Adjust switching sensitivity ......................................................10
Select signal voltage................................................................10
Closing the housing.................................................................11
2.12.1 Sealing the cable glands .....................................................11
2.12.2 Close housing......................................................................11
3Start-up...................................................................................11
Switch-on.................................................................................11
Function test at first start-up....................................................11
3.2.1 Check operability.................................................................11
3.2.2 Check for triggering by the bulk material.............................11
4Maintenance...........................................................................11
Recommended maintenance work..........................................11
Preventive functional check.....................................................11
Internal malfunctions ...............................................................11
4.3.1 Electronic self-monitoring....................................................11
Safety information for opening ................................................11
Removing the unit head (note) ................................................11
5Technical data .......................................................................12
Identification ............................................................................12
Specifications on the rating plate ............................................12
Electrical data ..........................................................................12
Ambient conditions ..................................................................12
Product materials.....................................................................12
6Dimensions ............................................................................13

Level Indicator Series MBA800
3 MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH
Product overview
200°C
350°C
200°C
80°C
800°C500°C
80°C
ATEX
Zone 20/21
(Option)

Level indicator series MBA800
MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH 4
1 Product description
Device components
1Unit head: Contains the drive systemand
electronic components. Two different types avail-
able.
2Process connection: thread or flange. At-
tached to the outer wall of the bulk material con-
tainer. Contains the shaft bearing and holds the
unit head on the outside and the protective tube (if
provided) on the inside. Many versions available
for adaptation to the actual bulk materials contain-
er
3Shaft: Connects the paddleto the unit head.
Variations: various lengths available (long lengths
divided intotwo sections); a steel cable as a
flexible shaft.
4Paddle: Stops the shaft rotation when thebulk material surrounds the
paddle. Variations: solid/flexible/foldable; size; material.
5Protective tube (option): Covers the shaft inside the bulkmaterial
container. Variations: protective tube for vertical installation, open (long
lengths delivered in two sections); protective tube for horizontal mounting
with additional shaft bearing at the end; angled extension arm for horizon-
tal mounting with angled, vertical shaft.
Principle of operation
A stepper motor in the unit head makes the shaft and paddle ro-
tate slowly. When the bulk material surrounds the paddle, the ro-
tation is blocked. This condition is detected electronically. In the
normal function mode, the stepper motor is then stopped imme-
diately. In the function mode with a reversal of direction, the di-
rection of rotation is reversed instead. Only when the paddle is
blocked in this direction of rotation as well is the stepper motor
stopped.
The blocked condition is signalled by a switch contact. As soon
as the bulk material releases the paddle again, the steppermotor
starts again automatically. The status signal is deactivated and
the paddle continues to rotate.
●The torque and response behaviour can be adapted to
the application case.
●The function mode with a reversal of direction is very well
suited for moving bulk materials (e.g. for reliable detection
of backing-up)
Optional equipment
●Display lamp: Indicates the current status.
●Compensating membrane: Moisture and pressure com-
pensating membrane on the unit head; safety requirement
for operation on containers with high pressure inside (option
“10 bar”). Acts as a bursting disc if the pressure in the unit
head suddenly increases in the event of a malfunction (> 2
bar).
●Height adjustment: Aclamp-ring fitting which holds the pro-
tective tube of the extension arm and can secure it at differ-
ent insertion depths.
Appropriate use
Application area
The MBA800 is used as a level detection switch for industrial
bulk material made of organic and mineral substances. The unit
must not be affected by chemically aggressive gases or fluids.
The unit must only be used for permanent installation in industrial
plants (large tools). There are device variants that are designed
for zone 21. These devices are marked accordingly onthe type
plate. Furthermore, the shaft end and paddle can be introduced
in zone 20 if the process connection is installed in apartition wall
and there is adequate seal tightness from the installation. The
seal tightness of the process connection in terms of zone sepa-
ration was not tested during the course of the EC type examina-
tion andmust be ensured by the user.
VCAUTION: Explosion hazard
An MBA800 level indicator may only be used in potentially
explosive locations if the individual specification of the unit
complies with this use.
► Check rating plate and accompanying papers.
► The requirements of the EC type examination certificate
must be observed.
Design options
Variable design features are, for example:
●paddle size, shape and material
●material and construction of the rotating shaft
●sealing between the housing and rotating shaft
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 observe the individual specifications of the delivered
unit.
Responsibility of the user
►Use the device only as described in these Operating In-
structions. The manufacturer assumes no responsibility and
no warranty for any other use.
►In addition to these Operating Instructions, follow all local
laws, technical rules and internal company operating direc-
tives applicable at the respective installation location of the
unit.
►No components may be removed from, added to or
changed on the unit unless this is described and specified
in the official manufacturer’s information.
►In potentially explosive areas: Prior to installation and oper-
ation, observe the European standard EN 60079-14.
►Observe the specifications in connection with the voltage
and temperature on the rating plate.
EN 60079-14: Electrical apparatus for use in the presence of
combustible dust –Part 14: Selection and installation
Product versions which are certified for use in potentially
explosive locations have been tested and approved accord-
ing to 60079-0 and EN 60079-31.
1
2
3
4
5

Level Indicator Series MBA800
5 MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH
Safety information for use in EX locations
●A level indicator of type MBA8x0 may only be used in poten-
tially explosive locations if the individual specification of the
unit complies with this use.
●Do not open when it is under voltage.
●After switching it off, wait 40 minutes before opening it.
●The temperature at the wire branching point can be up to
80°C. Only harmonised cable may be used.
●A melting fuse with a circuit-breaking capacity of at least
1500 A must be connected ahead.
●Check the unit based on the rating plate and delivery slip in
connection with the certification (ATEX).
●An approved unit bears the following marking:
II 1/2 DEx ta/tb IIIC T100°C Da/Db
●The EC type examination certificate is an integral part of the
Operating Instructions.
●Observe the regulations of the approvals
●Install a potential equalisation connection
●Prevent sparking from striking metal parts.
●Carry out the installation in accordance with the standard
EN 60079-14.
●Observe zone separation (see ‘Use’ section).
●Only perform the electrical installation in a suitable terminal
housing
●For process temperatures above +80 °C, suitable measures
must be taken to ensure that the housing temperature at the
transition from the shaft housing to the electronics box does
not exceed +50 °C.
Responsibility of the user
●Use the device only as described in these Operating Instruc-
tions. The manufacturer assumes no responsibility and no
warranty for any other use.
●In addition to these Operating Instructions, followall local
laws, technical rules and internal company operating direc-
tives applicable at the installation site of the unit.
●Observe the specifications in connection with the voltage
and temperature on the rating plate.
Conformity:
See declaration of conformity
Torque of the threaded
cable connection as per
EN 62444
Torque of the cover
screws ´4.7 Nm
Protection level Da for dust
Ex zone 20, 21 or 22
Thread undercut as per
DIN 509-E
Process connection
gasket: Klingersil C-4400
60 x 49 x 2 mm
Zone separation
6 mounting flanges for
wrench size: 55 mm
Torque: 300 Nm
Screw-in sleeve: G1.5”
as per ISO 228/1
Clamp screw:
Tightening moment: 4Nm
Screw lock medium strength
Protection level Db for dust
Ex zone 21 or 22 max. 60°C
Protection level Da for dust Ex
zone 20, 21 or 22
max. 80°C

Level indicator series MBA800
MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH 6
2 Installation
No components may be removed from, added to or changed
on the unit unless this is described and specified in the
official manufacturer’s information.
Otherwise then any warranty of the manufacturer becomes
invalid, and the approval for use in potentially explosive
locations (if provided) is no longer valid.
Installation location, protective roof
If at all possible, place the level indicator in a position where
falling bulk material will not directly strike the shaft or paddle.
For heavy bulk materials that could damage the shaft or the
paddle:
If required, install a stable deflector or protective roof inthe con-
tainer which protects theshaft and the paddle against direct im-
pact of fallingbulkmaterial.
If the bulk material is heavy or can form large clumps:
Install a stable protective roof in the container to shield the shaft
(and the extension arm) from the weight of the bulk material.
Provide sufficient space between the protective roof and paddle
to make sure that the bulk material can reach the paddle.
Assembly
Only necessary if the shaft, paddle, and protective tube were
shipped dismantled.
Install the shaft: Guide the end of the shaft into the shaft sleeve
of the unit head. Use the supplied split-pin to connect both parts
(push it through and spread it out). –For multi-part shafts, join
the parts of the shaft in the same way.
Assembling the protective tube(for multi-part protective tubes):
Take the locking screws out of the connecting coupling sleeve.
Screwone of the protective tube parts into the coupling sleeve
–up to about the middle of the sleeve. Then screw-in the other
part from the other side and firmly attach both parts of the pro-
tective tube. –Recommendation: Now make two small counter-
sunk holes in the coupling sleeve sections, which will fix the po-
sition of the locking screws (use a max. 3.2 mm diameter drill
guided through the screw holes of the coupling sleeve). –Put in
the locking screws and tighten.
Install the protective tube (for units with a protective tube): Ap-
ply a thread-locking agent (such as “Loctite”) to the thread of
the protective tube and screwit into the threadedsleeve as far
as it goes.
Shortening the flexible cable shaft (if required): Remove the
tensioning weight from the end of the cable (undo the locking
screw and pull out the cable). At the place where the cable
must be cut, wrap some adhesive tape firmly around the cable
to protect against wire particles shooting from thecable.Wear
protective goggles. Then cut the cable with a suitable wire cut-
ter or a cutting disk “Flex”), for example. Remove adhesive tape
residue and attachthe tensioning weight again.
Install the paddle: Guide the flat endof the paddle into the slot
of the shaft and attach it with the supplied split-pin or roll pin
(push it through and spread it out).
1 …7 = Order of assembly
It may be necessary (or advantageous) to install the paddle
at the very end of the installation procedure.
►Recommendation: Apply a thread-locking agent
(such as “Loctite”) to all the locking screws.
1.
3.
2.
2.
5.
4.
1
2.
3.
6.
7.
1.

Level Indicator Series MBA800
7 MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH
Installation
2.3.1 Operating conditions
Observe the temperature specifications on the rating plate (ex-
ample →page 10, § 5.2, explanations → page 4, § 1.4).
Keep the following pressure limits:
Standard version:
–50 …+300 kPa
(–0.5 …+3.0 bar)
Version “D10” (with burst mem-
brane on the unit head):
max. 1,0 MPa (10 bar)
In potentially explosive areas:
80 …110 kPa
(0.8 …+1.1 bar)
2.3.2 Installation position
Units without additional shaft bearing in the extension arm:
Use only with a vertically suspended shaft (±5°).
Exception: If theshaft is rigid and not longer than 200 mm and
the bulk material is light, an angle of inclination of max. 90°is
permissible (allows side mounting with horizontal shaft).
For lateral installation (horizontal shaft): Install the unit in such
a way that the cable connections are on the underside of the
housing.
The unit head can be turned (2) after the clampingscrew (1) on
the underside has been released.
In operating condition, the clamping screw must be fixed.
After the adjustment the device head must be tightened at the
medium strength through the clamp screwby using a screw
lock. (clamp screw: 4 Nm).
2.3.3 Fastening
Standard versions
Attach the MBA process connection to the container.
(dimensions → page 11, § 6).
For protection class IP 65 (EN 60529): Provide a suitable wa-
ter/dust seal between unit and container.
Version with height adjustment (option)
The height adjustment device is a clamp-ring fitting that can se-
cure the protective tube at variable insertion depths.
●Mount the clamp-ring fitting or alternatively the flange
with the clamp-ring fitting on the container.
●Put the coupling nut and the clamping ring of the clamp-
ring fitting over the protective tube.
●Guide the protective tube through the compression fitting
(caution: do not damage the sealing rings inside the
fitting) and bring it into the desired position.
●Guide the clamping ring into the fitting. Screw-up and
tighten the clamping nut.
●Attach the paddle.
Temperature protection by height adjustment
The height adjustment device can also be used to keep the unit
head away from high temperatures in the container.
Observe the following during the installation.
Adjust theheight to a level where the distance between unit
head and container is at least 200 mm.
If the container is equipped with thermal insulation: Remove the
thermal insulation around the protective tube
Under these conditions, the unit can be used with container
temperatures up to 200 °C.
0...5°
max. 200
12

Level indicator series MBA800
MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH 8
Potential equalisa-
tion screw
with eyelet, d=4
mm
2.3.4 Temperatures of the distance tube
Unit versions for container temperatures above 80 °C are
equipped with a distance tube between unit head and connection
thread/flange. The purpose of the distance tube is to keep high
temperatures away from the unit head (max. 60 °C).
If the container is equipped with thermal insulation: Keep the
entire length of the distance tube free of thermal insulation, in
order to allowcooling by the ambient air. Do not coverthe dis-
tance tube with the insulation of the container.
Otherwise the distance tube will not providethe required cooling
effect and the unit head could overheat. The consequence is a
loss of the function, damage.
WARNING: Risk of injury
The distance tube is possibly hot enough to burn skin imme-
diately when touched.
► If the container is hot: Protect the distance tube against
accidental touching.
WARNING: Risk of explosion from dust deposits
The surface temperature of the distance tube can be signifi-
cantly higher than the unit head temperature.
► Check if the dust-explosion limit value can be exceeded
when the surface of the distance tube is covered with dust
due to the high temperature of the distance tube.
► If this hazard exists: Make sure that the distance tube
cannot be contaminated with dust, or that the dust is period-
ically removed as a preventive measure.
Electrical connection
2.4.1 Safety notes for the installation
CAUTION: Exposed contacts inside the unit
The electrical contacts inside the unit are not protected
against accidental contact.
► Before opening the unit head, shut off the mains
power supply and all connected signal voltage.
► Have the unit installed and put into operation by
specialists who can carry out this work properly
and are familiar with possible dangers.
The unit has neither a mains switch nor mains fuse.
► Install an isolating switch in the supply voltage
line which can switch the mains power supply off.
► Install an external fuse for the supply voltage
(power consumption → page 12, § 5.3).
2.4.2 Power cord
► Use a power cord with the following conductor cross sec-
tions:
–Solid conductor: max. 2.5 mm2
–Stranded conductor: max. 1.5mm2
► Use cables that are specified for an ambient temperature of
at least 80 °C
► Protect all cables against heat. Avoid contact with hot surfac-
es (for example, thecontainer wall). Consider thermal radia-
tion and heat accumulation.
2.4.3 Protection against explosion
WARNING: Explosion hazard
If the unit is used in a potentially explosive location, the
following criteria must be observed:
► Approval:
–Check if the unit is suitablefor use inpotentially explosive
locations based on the rating plate and delivered docu-
ments.
–Observe the “special conditions” which are specified in
the approval.
► Potential equalisation: In addition to the protective earth
connection (PE), install a potential equalisation connection.
Use the terminal on the outside of the unit head for that pur-
pose.
► Housing temperature: For process temperatures above 50°C,
suitable measures must be taken to ensure that the housing
temperature at the transition from the shaft housing to the
electronics box does not exceed 50°C. The unit may also be
used at higher process temperatures up to +200 °C if suitable
measures are taken to ensure that the temperature of the
shaft housing does not exceed the temperature given above. If
the housing temperature of 50 °C cannot be complied with due
to higher process temperatures, then suitable cooling
measures (e.g. a cooling zone) must be taken.
► Cable: Use only cables that are suitable for the cable glands.
For standard versions of the unit, the outer diameter of the ca-
bles must be 7 … 12 mm.
► Permanent installation: Firmly install all connected cables,
which means fasten the cables along the entire length so that
the cables are protected against electrostatic charging.
► Sparks: Prevent the generation of sparks in the container.
Sparks can be generated when the shaft orthe paddle collides
with metal parts. For units equipped with a flexible cable shaft,
sparks could be produced when the shaft cable swings and
the paddle collides with the container wall.
► Installation standard: Carry out the installation in accordance
with the standard EN 60079-14.

Level Indicator Series MBA800
9 MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH
Wiring diagram MBA810 (115 …230 VAC)
Power supply MBA810
L1
Power supply 115 … 230 V 50/60 Hz
N
0V
MBA810 relay contact
1
Switch contact (opener NC)
2
Main contact
3
Switch contact (closer NO)
Connect the supply voltage 115 V … 230 V 50/60 Hz to terminals “L1”
and “N” or 24 V DC to “+24 V” and “GND”.
Wiring diagram MBA820 (24V DC)
1
GND
Reference potential for
24 V power supply
2
+24V DC
Power supply
3
GND
See terminal 1
4
+24V DC
See terminal 2
5
LED GND
Reference potential for
LED terminals 6, 7, and 8
6
LED LIVE
Output 0 V / 3 V DC max. 25 mA
switching operation like blue LED)
7
LED RED
Output 0 V / 3 V DC max. 25 mA
switching operation like red LED)
8
LED
GREEN
Output 0 V / 3 V DC max. 25 mA
0 V shaft stopped or 3V shaft turning
9
Out B
Switching signal for the operating
status
10
Out A
Switching signal for
shaft is blocked / shaft turning
11
IN B
Input for the operating status (Out B)
12
IN A
Input for the switching signal (Out A)
Connect the supply voltage to terminals “+24V” and “GND”.
MBA820 protective circuit
The signal outputs (terminal 9 and 10) must be protected
by a suppressor diode when switching inductive loads
(e.g. a relay).
2.3.1 M12 plug connector (option)
Only with MBA820 (24 V DC)
The connector can only be operated in “Internal” operating
mode.
A 5 pinM12 coupling with A coding is required for the electrical
connection.
The cable must be permanently installed.
Only connect and remove the connector voltage-free.
After connection of the connector, the unit must be mounted
in the locking clip.
Assignment of the coupling
PIN
Description
Terminal
1
Operating voltage
24 V DC ± 5 %
2
2
Output signal
0/24 V
10
3
GND
0V
1
4
Operating status
0/24 V DC
11
Locking clip
The locking clip prevents the connector
from being removed unintentionally. To in-
stall it, place both ends aroundthe con-
nector and press them together until both
halves snap into place.
Connect output signals
Function of the output signals
Exit
Function
Output signal
OutA
Level status1
If activated:
Supply voltage or InA
OutB
Operation
Supply voltage or InB
1Optionally “full” or “empty”
Reference potential of the output signals
The reference potential (–) of ”OutA”/”OutB” depends on which
signal voltage is selected:
●If “internal” is selected: Reference potential = GND.
●If “external” is selected: The outputs are potential-
free; the signal voltage comes from “InA” or alterna-
tively “InB” without a galvanic connection to GND.
Connect external signal voltage
Only needed if external signal voltages are to be used for
OutA/OutB.
The SW4/SW5 jumper must be connected to EXTERNAL for
this.
Input
Function
InA
Signal voltage (+) for OutA
InB
Signal voltage (+) for OutB
The reference potential (–) for the signal connections is GND.
► If InA/InB are to be used: Test/select the right setting
.

Level indicator series MBA800
MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH 10
LED functions
LED
State
Meaning
Live/Alive
(blue)
off
No supply voltage
on
Paddle rotating (motor on)
flashes slowly
Paddle is blocked (motor off)
flashes quickly
Blockage is being checked
(motor on)
OutA
(green)
off
Switch SW1 to I, paddle rotating
OutA
(green)
on
Switch SW1 to II, paddle rotating
OutB
(red)
on
Operation
Setting/adaptation
Switch logic of switching signal
Switch SW1 inverts the switching behaviour so that safety-
related switching (failsafe) can be set as a full or empty sensor:
SW1
Shaft
Tank
Terminal 10 (SW4 inter- nal)
Terminal 8
Green LED
Relay
MBA810
I
Shaft
turning
em
pty
0V
3V
off
Shaft
blocked
full
24V
0V
on
Fault
-----
0V
0V
off
II
Shaft
turning
em
pty
24V
3V
on
Shaft
blocked
full
0V
0V
off
Fault
-----
0V
0V
off
Select function mode
SW2
DRW
DZ
STOP
GO
0
X
10
1
-
5
2
-
15
3
X
3
4
-
10
5
X
15
6
-
3
7
-
1
8
-
Not assigned
9
-
Test mode
SW2
Setting of parameters 0 to 9
DRW
Xwith direction of rotation change
DZ
Rotational speed in rpm
STOP
Switching delay:
Shaft blocked until signal switches
GO
Switching delay:
Shaft turns until signal switches
short switching delay = fast
long switching delay = slow
Adjust switching sensitivity
SW3
Switching torque
Relative
Absolute
0
< 5
%
Very low switching torque –
only for special application
1
< 10
%
2
15
%
35
mNm
3
20
%
46
mNm
4
25
%
58
mNm
5
30
%
69
mNm
6
40
%
92
mNm
7
50
%
115
mNm
8
60
%
138
mNm
9
80
%
184
mNm
Select signal voltage
SW4
Output of OutA (if activated)
Internal
Supply voltage
External
Signal voltage of InA
SW5
Output of OutB (if activated)
Internal
Supply voltage
External
Signal voltage of InB
WIf “external” is selected, then outputs “OutA”/”OutB” are
potential-free
For the MBA810, SW4 must be set to “internal” so that the
function of the relay is given.
1
2
3
4
5
6
7
8
9
10
1
1
12
.
6
1
.
8
5
.
4
5
0
.
6
1
0.6
1

Level Indicator Series MBA800
11 MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH
Closing the housing
2.12.1 Sealing the cable glands
► After installation of the cables, seal the cable glands so that
they are dust-tight and water-tight.
► Unused cable glands must only besealed with original sealing
plugs in accordance with the manufacturer’s specifications.
2.12.2 Close housing
► Before closing cover of the unit, check whether there are any
foreign bodies inside the unit head (such as cable residue).
► Visually check the sealing of the cover of the unit. Clean or re-
place if necessary.
► Put on the cover of the unit and tighten the screws using 4.7
Nm.
► The cap nuts must betightened with the following torque:
Plastic threaded cable gland: 4.5 Nm +- 10%
Metal threaded cable gland: 8 Nm +- 10%
3 Start-up
Switch-on
WARNING: Health risk / explosion hazard
During operation, the unit head and the cable gland(s) must
be correctly closed and sealed. Otherwise the specified type
of protection and the specified explosion protection (option) is
not guaranteed.
●After switching on the supply voltage, the paddle turns at high
power for around 1 minute.
●After that, theMBA800 is operational.
Function test at first start-up
3.2.1 Check operability
After the first start-up, check the indicating function:
► Allow the paddle to rotate freely → check status of “OutA”
► Stop the paddle by hand → check status of “OutA”
The status of “OutA” depends on whether “full sensor” or
“empty sensor” is set (→ §Fehler! Verweisquelle konnte n
icht gefunden werden.).
3.2.2 Check for triggering by the bulk material
► Carefully fill or alternatively empty the bulk material container
up to the level indicator. Watch the process and check wheth-
er the level is shown correctly.
► Recommendation: Perform this test several times.
If the level indicator does not work correctly:
► Vary the sensitivity (→§Fehler! Verweisquelle konnte nicht g
efunden werden..)
► If that doesn’t help: Change the paddle (size, shape). Then
repeat thetest and adjust the switching sensitivity again.
If the bulk material has been changed:
► Carry out this test/adaptation again.
4 Maintenance
Recommended maintenance work
Clean moving external parts: Cleanoff deposits and dirt on
paddle and shaft roughly using ascraper and/or a brush. Do
not use force. Caution: Do not damage the shaft sealing. Do not
allow bristles to get between the shaft andthe shaft sealing.
Inspect wearing parts (highly recommended in case of abra-
sive bulk material): Inspect the parts that protrude into the bulk
material container (shaft/cable, paddle, etc.). Pay special atten-
tion to the connecting parts (split-pins, etc.). Replace damaged
or questionable parts.
Clean the protective tube (if the protective tube has open end):
Preventatively clean the inside of the protective tube to make
sure that the shaft can always freely rotate.
Clean distance tube (is present –if required for explosion
protection → page 9 §2.3.4): Remove dust deposits from the
distance tube.
Preventive functional check
If the indicating function is rarely triggered during operation
(e.g. for use as a safety switch):
1Inform the connectedstations that a test will be carried out.
2Stop the paddle by hand / allow the paddle to rotate freely,
and check thetriggering of the indicating function.
Internal malfunctions
4.3.1 Electronic self-monitoring
Self-monitoring is constantly active in the electronics.
If the self-monitoring detects a malfunction, then output
“OutB” is deactivated (→ page 9 §3.5.2).
Safety information for opening
WARNING: Health risk / explosion hazard
► Before opening the unit head: switch-off the pow-
er supply and any connected signal voltage at an
external point. (Caution: This disables the level
indicator.)
► Only open the housing when you are absolutely
sure that there is no possible danger.
► Do not open when it is under voltage.
► After switching it off, wait 40 minutes before
opening it.
Removing the unit head (note)
The unit head can easily be separated from the process connec-
tion without opening the process connection:
●If theunit head is to be removed completely, disconnect the
electric cables first.
●Loosen the clamping screwon the underside by approxi-
mately 3 mm (3 … 4 turns).
●Carefully pull the unit head from the process connection
along the direction of the shaft. This requires some strength
due to the adhesion and friction of the sealing: use con-
trolled force, but no brute force; risk of falling; be prepared
for the unit head to become suddenly free.
●Reinstall in the reverse order.
●The clamp screwmust be tightened at the medium strength
by using a screw lock. (clamp screw: 4 Nm).

Level indicator series MBA800
MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH 12
5 Technical data
Identification
Identification:
II 1/2 D Ex ta/tb IIIC T100°C
Da/Db
Identification:
IECEx Ex ta/tb IIIC T100°C Da/Db
Type examination
certificate:
DEKRA BVS 17 ATEX E 081 X
Specifications on the rating plate
●Unit type and version code
●Supply voltage
●Explosion protection classification
●Housing protection class
●Minimum surface temperatures:
–The temperature value Tiapplies to the parts of the unit
that protrude into the container.
–The temperature value Taapplies to the unit head.
Specifications on the rating plate apply with higher priority.
Electrical data
MBA810
Supply voltage:
115 …230 V AC, 50/60 Hz
Power consumption:
6 VA (max.) Without connected
Appliance
MBA820
Supply voltage:
24 V DC ± 5 %
Power consumption:
6 W (max.)
Ambient conditions
Ambient temperature outside
the container (without
ATEX):
–30 …+60 °C
Ambient temperature outside
the container (with ATEX)
-20 …+50 °C
Maximum surface tempera-
ture of the product:
see rating plate
Product materials
Product materials in contact with the bulk material
Shaft, protective tube,
process connection, paddle
Steel / stainless steel 1
Aluminium 2 / Silicon
Seals:
Viton / Silicon and PTFE
or graphite 2
1Depending on the unit version
2Version for 350 °C
Materials of the unit head
Housing body:
Aluminium
Housing cover:
Aluminium
Housing seal:
Silicon (VMQ)
Screw connections:
PA (gasket: NBR)
Option: brass, nickel plated
(gaskets: NBR/FPM)
Sealing plugs:
PA
Compensating membrane:
Polyester/PTFE
(gasket: silicon)
ATEX version in
stainless steel

13 MBA800 · Operating instructions · 8011610 4.0 · 2022-10 · © MBA Instruments GmbH
6 Dimensions
125
L
28
29
48
G1½"
33.2
A
125
220L
70
60
D
L178
41
D
33.2
A B C D
mm
210 170 18 16
220 180 18 20
240 200 18 18
250 210 18 22
228.6 190.5 19
DN 100 PN 6
DN 100 PN 16
DN 125 PN 6
DN 125 PN 16
4"ANSI Class 150
5"ANSI Class 150 254.5 215.9 22.2
B
105
135
118
58
160
C

MBA Instruments GmbH
Friedrich-List-Str. 7 · 25451 Quickborn · Germany
Telefon [phone]
www.mba-instruments.de · [e-mail]
8011610 –2022-10