Palas RBG 1000 I Series User manual

PALAS GmbH
Partikel- und Lasermesstechnik
Greschbachstrasse 3b
76229 Karlsruhe
Phone [phone]
Fax [phone]
[email protected]
www.palas.de
Operating Manual
Solid Particle Disperser
Series of RBG 1000 I

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
©PALAS ®GMBH, KARLSRUHE,VERSION V001022014
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Index
IMPORTANT NOTE !!!.......................................................................................................... 4
1. CHECK OF DELIVERY.....................................................................................................5
1.1 ACCESSORY EQUIPMENT SUPPLIES CHECK FOR STANDARD VERSION................................ 5
2. SAFETY CONDITIONS / INTENDED USE .................................................................................6
2.1 GENERAL SAFTY CONDITIONS .................................................................................................... 6
2.2 INTENDED USE ....................................................................................................................... 6
2.3 RESPONSIBILITY OF THE OPERATOR............................................................................................. 6
3. FIRST OPERATING INSTRUCTIONS.........................................................................................7
4. OPERATING PRINCIPLE................................................................................................. 8
4.1 FEED RATE AND MASS CONCENTRATION........................................................................... 9
4.2 FEED RATE CONSTANCY .................................................................................................... 9
4.3 DISPERSION AIR AND DISPERSION EFFECT....................................................................... 10
4.4 ELECTROSTATIC CHARGING OF THE DUST PARTICLES ..................................................... 10
5. GENERATOR LAYOUT.................................................................................................. 11
5.1 GENERAL DESCRIPTION ................................................................................................... 13
5.2 OPERATING PANEL........................................................................................................... 14
5.3 DISPERSION HEAD............................................................................................................ 16
5.4 COMPONENTS LAYOUT OF DSIPERSION HEAD................................................................... 17
5.5 INTERNAL COMPRESSED AIR FLOW SYSTEM.................................................................... 18
6. OPERATING THE RBG 1000 I AND RBG 1000 ID..................................................... 19
6.1 SETTING OF DISPERSION VOLUME FLOW.......................................................................... 19
6.1.1 The Volume Flow Curve....................................................................................... 19
6.1.2 Volume Flow Curve Check................................................................................... 19
6.2 FILLING OF THE POWDER RESERVOIR............................................................................... 21
6.3 INSERTING OF THE POWDER RESERVOIR .......................................................................... 22
6.4 SETUP OF THE GENERATOR FOR OPERATION.................................................................... 22
6.4.1 Position of Generator........................................................................................... 22
6.4.2 Connection Lines for Dust Transportation .......................................................... 22
6.5 FEEDING AND DISPERSION ............................................................................................... 23
6.5.1 Continuous Operation.......................................................................................... 23
6.5.2 Intermittent Operation.......................................................................................... 23
6.6 CHANGING OF POWDER RESERVOIR................................................................................. 23
7. MALFUNCTIONS............................................................................................................. 24
7.1 TABLE OF OPERATING-AND TROUBLE INDICATORS......................................................... 24
7.2 BREAKDOWN,CAUSE,AND ELIMINATION........................................................................ 25

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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8. MAINTENANCE............................................................................................................... 26
8.1 CHANGING AND CLEANING OF BRUSH ............................................................................. 26
8.1.1 Removal of Brush ................................................................................................. 26
8.1.2 Cleaning of the Brush ........................................................................................... 28
8.1.3 Installation of Brush............................................................................................. 29
8.2 CHANGING AND CLEANING OF DISPERSION COVER.......................................................... 29
8.3 CHANGING OF SEALING RING AT TRANSPORTATION PISTON............................................ 31
9. PROBLEMS –WHAT TO DO IF THE POWDER DISPERSION SYSTEM OF THE SERIES RBG
DOES NOT WORK CORRECTLY:................................................................................................32
9.1 POLLUTION OF THE POWDER DISPERSER .................................................................................... 32
9.2 FAQS................................................................................................................................ 32
9.3 GENERAL ............................................................................................................................ 32
10. TECHNICAL DATA .......................................................................................................33
10.1 INTERNAL FUSE .............................................................................................................. 34
11. SPARE PARTS LIST / ACCESSORIES LIST............................................................................. 35
11.1 THE FOLLOWING OPTIONS ARE AVAILABLE AS ACCESSORIES:......................................................... 35
11.2 THE FOLLOWING REPLACEMENT PARTS ARE AVAILABLE:.............................................................. 35
12. TRANSPORT, PACKAGING AND STORAGE ........................................................................ 36
12.1 PACKAGING:...................................................................................................................... 36
12.2 STORAGE:......................................................................................................................... 36
12.3 TRANSPORT:...................................................................................................................... 36
13. DISPOSAL OF THE RBG 1000 I OR RBG 1000 ID ................................................................36
14. LITERATURE ........................................................................................................................37
15. SPECIAL VERSIONS..................................................................................................... 38
15.1 RGB 1000 ID................................................................................................................. 38
15.1.1 Special parts oft he pressure tight version: ............................................................ 38
15.1.2 Volumen flow curve of RBG 1000 ID....................................................................... 38
15.1.3 Feedstock reservoir of the RBG 1000 ID ................................................................. 41
15.1.4 Differences in teh technical data within the RBG 1000 D....................................... 41
15.2EXTERNAL CONTROL OF RBG 1000 IOR RBG 1000 ID.................................................. 41
16. FEEDBACK FORM ........................................................................................................44

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
©PALAS ®GMBH, KARLSRUHE,VERSION V001022014
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Important Note !!!
Start operation of RBG 1000 I and RBG 1000 ID only after careful study of operating manual.
The manufacturer is not liable for damages caused by improper operating, use, cleaning,
faulty operation or the dispersion of unsuitable powders.
Please take note of the following points:
- The pressure tight version may only be operated in dry rooms, under pressure < 3 bar and
at room temperature. The manufacturer will not be liable with regard to the operating
guarantee, if operating takes place under different environmental conditions, such as,
corrosive or explosive environment, electric or electromagnetic fields, operating within
areas of ionizing radiation, within areas conducive to shock or vibration, as well as
connection of equipment to a power supply of high noise level.
- Only use powders with a particle size < 100 µm !
- Do not use humid, sticky powders, or such powders that react aggressively to stainless
steel!
-Only use original spare parts !
-Only use dry, oil-free and particle-free dispersion air. Wet air causes coalescation of
brush and sedimentation inside of dispersion nozzle.
-The housing of RBG is made of stainless steel and is therefore noncorrodible.
Nevertheless the generator should not be used or stored in humid environments. Please
mind that stainless steel is not resistant to salt solutions.
- Attention: Aerosols might be dangerous to your health. That’s why they ought not to be
inhaled. It might also be necessary to wear protective clothes. Please pay attention to the
correspondent standards and safety rules.
The RGB 1000 corresponds to the VDI - guideline 3491, part 9, production of test aerosols by
means of a brush disperser, VDI-Handbuch "Reinhaltung der Luft", volume 4.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
©PALAS ®GMBH, KARLSRUHE,VERSION V001022014
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1. Check of Delivery
1.1 Accessory Equipment Supplies Check for Standard Version
Please verify immediately after unpacking the generator, if delivery of all accessory
equipment supplies is complete.
Attached to the generator (see also figure 1):
1 powder reservoir
1 transportation piston
1 support for powder reservoir
1 adapter
Mounted inside the case:
1 brush exchange bolt
1 allen wrench for dispersion cover screws
plus:
1 pressure minimizer with manometer
1 line cord
1 tamper
2 connection cables between the electrical control unit and the
dosing unit
1operating manual
Fig. 1: RBG 1000 I

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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2. Safety conditions / Intended use
2.1 General safty conditions
For safety reasons, under no circumstances may the machine be commissioned if there is
visible damage. In this event, please contact Palas® (Tel.: [phone]).
The dust disoerser has been set by the manufacturer to be used with a maximum pre-
pressure of Pmax 8 bar for the compressed air supply. Please make sure that the
maximum pre-pressure of Pmax 8 bar specified on the type plate agrees with the
provided compressed air line where the machine is to be used.
The RBG 1000 I or RBG 1000 ID has been permanently adjusted by the manufacturer to
the mains voltage requested in the order. Please verify, if the mains voltage indicated on
the type label corresponds to the mains voltage at the respective place of installment.
Only use original spare parts! Please contact the manufacturer whenever necessary.
Please only use dry, particle- and oil-free compressed air supply. For other carrier gases
please contact Palas®.
2.2 Intended use
The dust disperser RBG 1000 I or RBG 10000 ID was designed to disperse a bulk or dust
into air/ gas stream.
The manufacturer is not responsible for any damage, which arease due to incorrect
operation, cleaning, error in operation or the measurement of aerosols which gas
conditions or compound the instrument is not specified for.
The machine may only be operated in dry rooms, under atmospheric ambient pressure
and at room temperature.
Operating under other ambient conditions such as in corrosive or explosive
environments, in strong electric or electromagnetic fields, in areas with ionising radiation
as well as in areas subject to impact and vibration is not covered by any functional
guarantee by the manufacturer
2.3 Responsibility of the operator
The device was designed and built in consideration of the standards to be adhered to. It
therefore represents state-of-the-art technology and allows a high degree of safety in
operation.
Please only operate the dust disperser of the RBG series after reading carefully the
manual.
Trained personal
Be sure that the machine cannot be used by unauthorised personnel.
Caution: Depending on the type, aerosols can pose a health hazard. They should
therefore not be inhaled. When working with or when around hazardous materials, care
must also be taken to wear appropriate protective clothing (respirator mask). Please
follow all applicable guidelines and accident prevention regulations.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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3. First Operating Instructions
Connect mains plug.
Connect compressed air supply (4 - 10 bar overpressure) via a pressure reduction valve
(or another suitable valve) to the generator and set desired pre-pressure (see volume
flow curve).
Drive back the feed unit by pressing the button Stop/Down (max. speed about
700 mm/h).
Press button Stop to arrest feed unit at desired position.
Take out support and adapter.
Take out reservoir, fill it and put it back into the generator.
Reinstall support and adapter.
Press buttons Air, Brush and Feed and move up feeding device with maximum speed
until adapter is arrested between feed plug and transport piston.
Press Stop button
Turn feeding speed down to zero at the potentiometer (anti-clockwise)
For powder dosage, press buttons Air , Brush and Feed.
Set to required feeding speed.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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4. Operating Principle
The Rotating Brush Generator RBG 1000 I or RBG 1000 ID transfers dry, non-cohesive
powder and dust particles into an airborne state. The generator permits the solution of two
basic problems relative to the dust- and powder technology. For one thing, it permits exact
dosing of powders (also within the range of "milligram per hour"), and on the other hand the
dispersing of fine powders in dry phase. The basic principle of the RBG 1000 I and RBG 1000
ID is described below and illustrated by a cross sectional view (see figure 4.1 and /1/).
brush
dispersing airaerosol
powder
transportation piston
feed
powder reservoir
Fig. 4.1: Operating principle of the RBG series
Inside a stainless steel block (dispersion head) a pivoted cylindrical brush is positioned.
Below this brush the cylindric powder reservoir is located which is filled with the bulk
material to be dispersed. The transportation piston pushes the compacted mass at a given
speed out of the reservoir and onto the rotating brush which carries it into the upper part of
the dispersion head (dispersion cover). There, the mass is blown out of the brush by a high
velocity air stream (dispersing air) and is carried off via the dust-exit-nozzle. The high air
velocity is an important factor since the dispersing of small particles requires high energies.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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4.1 Feed Rate and Mass Concentration
The feed rate relative to the mass, also called mass flow, indicates the amount of dust per
time (dimension: gram per hour) which is propelled out of the powder dispersion generator.
The mass flow M is exactly determined by the following parameters:
d diameter of powder reservoir
q compact density of powder inside the reservoir
v feed velocity of piston
Given a homogeneous compact density inside the powder reservoir the mass flow can be
calculated by using the following equation:
M =

/4

d²

v

q
Taking into consideration the dispersion air volume flow rate V, the mass concentration MC
inside the dust-exist-ozzle is also to be calculated according to the following equation:
MC= M / V
At a given compact density (material property) the mass flow, i.e. the mass concentration,
may now be varied within a wide range, and set by definition, with the help of the "free"
parameters d, v and V.
4.2 Feed Rate Constancy
The feed rate constancy is a measure for the time-related fluctuation of the mass flow. Two
of the three parameters relative to the mass flow, d and v, can be kept sufficiently constant,
mechanically and electronically, - in reference to the time - without problems. The third
parameter is the compact density. It may vary in its mean, as well as in its local fluctuations,
depending on user and powder. Local fluctuations of the compact density inside the powder
reservoir are directly noticeable as time-related fluctuations of the mass flow. With a little
experience and careful compacting, a compact density constancy can be obtained within
5% - 10%. See also no. 6.2. of the present operating manual, "Filling of Powder Reservoir".
For long-term aerosol production (approx. 10 min.) there's a feed rate constancy of approx.
1% for steam soot.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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4.3 Dispersion Air and Dispersion Effect
Only use dry, oil-free and particle-free disperdion air. Wet air causes coalescation of brush
and sedimentation inside of dispersion nozzle.
A general rule is: the smaller the particles, the higher the required energy for their
dispersion. This dispersion energy is provided by the dispersion air. Basically this means: the
best dispersion effect is reached with a maximum amount of dispersion air and low powder
feed rate.
The parameters for the volume flow of the dispersion air are stated under the headline
"Technical Data" in the operating manual of the respective generator.
The upper limitation:
The dispersion air is held and processed inside of the equipment. This fact necessarily causes
a certain pressure drop which must be balanced by the equipment. This pressure drop rises
with a rising volume flow and must not exceed a certain limit. Consequently, the amount of
dispersion air is limited.
The lower limitation:
The lower limitation is determined first, by the fact that the brush must be blown empty,
and the powder matter must be carried off, and secondly, by the requirement for sufficient
dispersion energy.
In many instances, large volume flows cannot be achieved for experimental reasons,
whereas an optimal dispersion effect is desirable with high amounts of compact powder.
Therefore a compromise in reference to the amount of dispersion air must be found.
4.4 Electrostatic Charging of the Dust Particles
During dispersion the particles become electrostatically charged. The degree of charging
depends on properties and conditions of the materials that are separated from one another
(powder, dispersing gas, housing). If we want to obtain a reproducable charge distribution
for a given powder, then it will certainly be helpful to use a dispersion gas which is defined in
temperature and humidity, with equally defined humidity and temperature conditions of the
powder.
The discharging of the particles is possible for example, by mixing the aerosol with a
bipolarly ionized gas. Quantity statements about charging conditions and discharge
possibilities of an aerosol produced with the RBG 1000 I or RBG 1000 ID are made under
/10/.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
©PALAS ®GMBH, KARLSRUHE,VERSION V001022014
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5. Generator Layout
Fig. 5a: Front view of instrument
At the left side of the instrument the compressed air connection is located (can be used with
NG 8 fast coupling connections)
On the rear side of the electrical control unit (see fig. 5b) the connection fort he electrical
power with integrated fuses and On/off switch is located (see fig. 5b). The aerosol outlet
tube is on the rear side of the dosing unit, directly behind the dispersion cover.
Electrical
control unit
Inlet of air for
diserpsion
Brush housing
with integrated
brush
pos. support
holder
pos. spacer
holder
Connection of compressed
air with reducer
Bedienfeld mit Tasten für
Luft;
Bürste,
Vorschub,
Halt/Down und
Stop
Feedstock
reservoir
Connection for
electrical cable with 3
Pole round plug
Connection for
electrical cable with
25 Pole connector
UP/ Down Schalter
Switch for manual or external control

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
©PALAS ®GMBH, KARLSRUHE,VERSION V001022014
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Fig. 5b: Rear side oft he electrical control unit
Fig. 5c: Connections oft he dosing unit
electrical cable
with 25 Pole
connector
electrical cable
with 3 Pole round
plug
Connection for
external
control
On/ OFF switch
Net fuse
Power cable
electrical cable
with 25 Pole
connector
electrical cable
with 3 Pole round
plug
Pressure reducer and
compressed air inlet

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
©PALAS ®GMBH, KARLSRUHE,VERSION V001022014
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5.1 General Description
Figure 5. shows the front view of the equipment. To front cover of the electrical control unit
the operating panel is located (see 5a).
Fig. 5.1a: dismounted feedstock reservoir
For demonstration purposes, the illustration shows the brush half taken off, with the
screwed in brush exchange bolt. The powder reservoir (here: 28 mm inner diameter) with
the partly inserted transportation piston lies in front of the instrument. The mill-cut groove
will permit exact positioning when inserting the reservoir. The support keeps the inserted
reservoir from slipping out of the dispersion head. The adapter is inserted inbetween the
feed unit and the transportation piston. It reduces the necessary driving distance of the feed
unit when changing the powder reservoir.
On the right side wall of the instrument the compressed air connection is located (suited for
fast coupling of the type NG 8). On the opposite side wall (not visible on 5.) there are the
socket for the mains connection with integrated fuse case and the mains switch (see figure
5.1a). The dust-exit-nozzle is located at the back of the equipment, directly behind the
dispersion cover.
The brush is dismounted from the brush housing on figure 5.1b including the tool for taking
out the brush.
Fig. 5.1a: dismounted brush
Feedstock
reservoir
pos. support
holder
pos. spacer
holder
Nut for the mounting oft he feedstock
reservoir at teh dispersion head

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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5.2 Operating Panel
Figure 5.2. shows the operating panel of the RBG 1000.The LED-Display indicates important
operating parameters. The buttons in the upper row serve to chose the required paramater,
according to the reference below.
Fig. 5.2: Operating panel of the RBG 1000 I or RBG 1000 ID
Button
Operating Ranges
Upm
number of brush rotations per minute
mm
present feed stock filling height in powder reservoir in millimeters
mm/h
feed speed of transportation piston in millimeter per hour
The indicated operating parameter is identified by a light emitting diode (LED) which is
integrated into the button. The brush revolution number and the feed speed are adjusted by
the below arranged potentiometers (Brush and Feed respectively). Most powders can be
dispersed in the best way with maximum brush rotation.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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The respective adjustment ranges are:
600 - 1200 R/min
for the brush revolution number
0 - 700 mm/h
for the feed speed
The functions of the buttons in the lower row are shown in the table below:
Button:
Function:
Air
opens incorporated solenoid valve und makes the air flow through the
dispersion head
Brush
activates brush propelling motor
Feed
activates feed motor
Stop / Down
without prior activating of button Stop:
switches feed motor off;
the air remains switched on
following prior activating of button Stop:
switches feed motor to drive back at maximum speed
Stop
switches off feed motor, brush, and air
The air has to be switched on and the minimum pre-pressure set, before you will be able to
switch on the brush.
The brush has to be activated prior to turning on the feed system, otherwise it will not work.
The feed motor is automatically switched off in the higher and lower end positions.
The light of the LED which is integrated in the button, indicates that the function is active.
Intermittently blinking LEDs indicate a malfunction (see section 7.1.).

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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5.3 Dispersion Head
The dispersion head is the central unit of the RGB-1000. Figure 5.3. shows a cross section
view of the dispersion head. In its lower part the insertion opening for the powder reservoir
is located, to its right a cover with sealing screw which serves to take out the brush (brush
cover), and above the dispersion cover with integrated dust-exit-nozzle. The shape of the
inner part of the dispersion cover allows for an optimum dispersion effect, as far as the air
flowing over the brush is concerned.
Fig. 5.3: Cross section view of the dispersion head
Four different dispersion covers are available to assure maximum adaption of the RBG 1000
to its respective purpose:
Type A
big flow cross section,
to be used with powder reservoirs of 7 mm to 28 mm diameter
volume flow: 2,0 - 5,0 m³/h
Type B
medium flow cross section
to be used with powder reservoirs of 7 mm to 14 mm diameter
volume flow: 1,0 - 2,5 m³/h
Type C
small flow cross section,
to be used with powder reservoirs of 7 mm diameter
volume flow: 0,5 - 1,25 m³/h
The RBG 1000 I or RBG 1000 ID standard is fitted with a stainless steel brush. When using
mechanically sensitive powders for dispersion, it is recommended to employ a plastic brush
which can be delivered as spare part, shaft and bearing included.
In order to reach optimum dispersion, each brush is specifically adapted to the respective
dispersion head during manufacturing.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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5.4 Components Layout of dsipersion head
Fig. 5.4a Rear side of dispersion head
The fig. 5.a shows an overview about the RBG 1000 ID with the pressure relief valve and the
trottle for setting the relief pressure value. If an over-pressur ehigher as 3 bar is reached the
pressure relief valve is opening to relief the pressure.
Within the standard ID version the pressure relief valve and the trottle is not included.
Fig. 5.4b Front side of dispersion head
Supply with dispersin air
Aerosol outlet
Housing of the rotating brush with
internal brush
Pressure relief valve
Trottle for setting
the pressure relief
valve setpoint
Dispersion cover
Housing of the rotating brush with
internal brush
Dispersion cover
Supply with dispersion air
Trottle for setting
dispersion air flow

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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5.5 Internal Compressed Air Flow System
Directly behind the compressed air connection a solenoid valve is located which is activated
with the button Air (see Fig. 5c).
The neighbouring pressure switch is set in such a way that it reacts to the pre-pressure
causing the minimal flow. If the pre-pressure falls below that value, it prevents activating of
brush and feed system. From the connector LA1 the air is directly led to the dispersion cover
(connector LA2).
The internal pressure switch does not control the flow. This switch is principally set by Palas
in such a way, that –provided dispersion cover A is used –air does only flow if the pre-
pressure reaches approximately < 0,5 bar (see fig. 6.1).
Attention!
It is not allowed to run the RBG 1000 below 0.5 bar!
Unobjectionable funcion is only guaranteed within the ranges of volume flow curves shown
in fig. 6.1.
The dispersion effect depends on the feed and on the relation between diameter of feed
stock reservoir and air volume flow.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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6. Operating the RBG 1000 I and RBG 1000 ID
6.1 Setting of Dispersion volume Flow
A reproducible settable valve (for example pressure reducing valve) and a volume flow
meter with convenient measuring range are required in order to set the volume flow.
6.1.1 The Volume Flow Curve
In figure 6.1, the volume flow rate is plotted as a function of the pre-pressure for the
different dispersion covers (volume flow curves). A pressure reduction valve with pressure
gauge, inserted in-between compressed-air supply adn RBG air-connection, serves to
regulate the desired flow with the help of the respective voluem flow curve.
Dosage unter standard conditions (p= 1 bar)
Fig. 6.1: Volume flow curves for RBG 1000
6.1.2 Volume Flow Curve Check
A reproducably adjustable valve (e.g. pressure reduction valve) and a flow gauge with
corresponding measuring range are needed to chek the volume flow. Fig. 6.2. shows an
arrangement that permits readjustment.

OPERATING MANUAL RBG 1000 IAND RBG 1000 ID
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Fig. 6.2: Set-up for determining the voluem flow as a function of pre-pressure
The adjustment is to be done without dust; the following sequence is recommended:
- Connect compressed air supply via a pressure reduction valve to the compressed air
connection of the equipment.
- Connect the inlet of the flow meter directly to the dust-exit-nozzle while leaving the
outlet open.
- Connect the equipment to the mains.
- Insert empty powder reservoir, support and adapter, pull piston down until it reaches the
adapter.
- Activate air flow by pressing button Air.
- set volume flow to desired value via the pressure reduction valve and write down valve
setting. Note: Only above the minimum pre-pressure (LED Air on) will the equipment
later be ready for operation.
If this adjustment procedure is repeated for different volume flows, a calibration curve will
finally result.
Attention:
The pressure switch does not control the flow, but only the minimum pre-pressure.
Should it become necessary to disperse into a reservoir with a defined counterpressure, the
pre-pressure needs to be raised by the amount of the counterpressure to achieve a sufficient
volume flow rate.
With conterpressures of over 200 mbar, hte pressure-tight version of RBG 1000 must be
used. Otherwise, the brush’s ball bearing and motor might be damaged.