HBM VKK2R-8 DIGITAL User manual

A1144-3.0 en/de
Junction box
Klemmenkasten
VKK2R-8 DIGITAL,
VKD2R-8
Mounting instructions
Montageanleitung
VKK2R-8 DIGITAL
VKD2R-8

2VKK2R-8 DIGITAL, VKD2R-8
HBM A1144-3.0 en/de/fr
Contents Page
Safety instructions 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Introduction and appropriate use 6. . . . . . . . . . . . . . . . . . . . . . . . .
2 Mechanical construction 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Mounting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Electrical connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Cable connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Clamp connection 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Power supply 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Connection to a computer 11. . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 RS-485 4-wire bus 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 RS-485 2-wire bus 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7 Connecting VKD2R-8 with DIS2116 16. . . . . . . . . . . . . . . . . .
4 VK... Specifications 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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VKK2R-8 DIGITAL, VKD2R-8
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NOTE
These mounting instructions describe VKK2R−8 and VKD2R−8 junction
boxes. The design and handling of both devices is absolutely identical. The
type designation is abbreviated to VK... in this document.
Safety instructions
Appropriate use
The junction box is to be used exclusively for interconnecting the interfaces,
the power supply and the bus termination. Use for any purpose other than the
above shall be deemed to be not in accordance with the regulations.
In the interests of safety, the junction box should only be used as described in
the Mounting Instructions. It is also essential to comply with the legal and
safety requirements for the application concerned during use. The same
applies to the use of accessories.
The junction box is not a safety element as defined under Appropriate use.
For safe and trouble-free operation, this junction box must not only be
correctly transported, stored, sited and installed, but must also be carefully
operated and maintained.
General dangers of failing to follow the safety instructions
The junction box is a state of the art unit and as such is fail-safe. The junction
box may give rise to further dangers if it is inappropriately installed and
operated by untrained personnel.
Any person instructed to carry out installation, commissioning, maintenance or
repair of a junction box must have read and understood the Mounting
Instructions and in particular the technical safety instructions.
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product
complies with the requirements of the relevant EC guidelines. Please find the
Declaration of Conformity under www.hbm.com.

4VKK2R-8 DIGITAL, VKD2R-8
HBM A1144-3.0 en/de/fr
Remaining dangers
The scope of supply and list of components provided with the junction box
cover only part of the scope of connection technique. In addition, equipment
planners, installers and operators should plan, implement and respond to the
safety engineering considerations of connection technique in such a way as to
minimize remaining dangers. Prevailing regulations must be complied with at
all times. There must be reference to the remaining dangers connected with
connection technique.
Symbol: NOTE
Refers to the fact that important information is being given about the product
or its use.
Unauthorized conversions and modifications are prohibited
The junction box must not be modified from the design or safety engineering
point of view except with our express agreement. Any modification shall
exclude all liability on our part for any resulting damage.
Qualified personnel
The junction box is only to be installed by qualified personnel strictly in
accordance with the technical data and with the rules and safety regulations
which follow. It is also essential to comply with the legal and safety
requirements for the application concerned. The same applies to the use of
accessories.
Qualified personnel means persons entrusted with the installation, assembly,
commissioning and operation of the product who possess the appropriate
qualifications for their function.
Conditions on site
Do not allow the junction box to become dirty or damp.
Maintenance
The junction box is designed to provide degree of protection IP65 (dust
protection, protection against water jets). You must make regular checks to
ensure that the rubber seal in the cover and the screw connections is not
leaking.
Accident prevention
The relevant accident prevention regulations must be taken into
consideration.

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NOTE
Neither the design of the device nor any technical safety aspects may be
modified without the express permission of Hottinger Baldwin Messtechnik
GmbH. Any modification excludes Hottinger Baldwin Messtechnik GmbH from
any and all liability for any damage resulting therefrom.
It is strictly forbidden to carry out any repairs and soldering work on the
motherboards or to replace any components. Repairs may only be carried out
by persons authorized thereto by Hottinger Baldwin Messtechnik GmbH.
•During installation and when connecting the cables, take action to prevent
electrostatic discharge as this may damage the electronics.
•The required power supply is an extra-low voltage (6...30 V) with safe
disconnection from the mains.
•When connecting additional devices, comply with the safety requirements
for electrical measurement, control, regulatory and laboratory equipment
(EN61010).
•All the interconnecting cables must be screened cables. The screen must
be connected extensively to ground on both sides.

6VKK2R-8 DIGITAL, VKD2R-8
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1 Introduction and appropriate use
The VK... junction box is used to interconnect the serial interfaces (RS-485),
the power supply and the RS-485 bus termination.
It is preferable for the following HBM products to be wired in the RS-485 bus:
•Digital transducers: C16i, FIT
•Digital transducer electronics: AED9101B, AED9201A
•Digital measurement chains with transducer electronics: AD104-R5, AD105
•Weighing electronics: WE2107M, WE2108, WE2110
•Scale electronics DIS2116 with digital transducers.
The RS-485 bus can be wired as a 2-wire- or a 4-wire bus. The form of
connection to be used will depend on the particular type of digital transducer
or measuring amplifier (see the respective Operating Manuals).
HBM product RS-485 bus
C16i 4-wire
FIT 4-wire
AED9101B 2 / 4-wire
AED9201A 4-wire
AD104-R4 4-wire
AD105 2-wire
WE2107M 4-wire
WE2108S/M-485 4-wire
WE2110 4-wire
DIS2116 4-wire
Up to eight digital transducers / measuring amplifiers can be connected
together to a VK... (connections Load Cell 1..8). The cable to the control
computer is connected to the Output clamp.
If several junction boxes are needed in a bus, up to 7 digital transducers /
measuring amplifiers can be connected to a VK... (connections Load Cell
1..7). Connection Load Cell 8 is then used to connect to the first junction box.
The cable to the control computer is connected to the Output clamp.

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2 Mechanical construction
The junction box has the following functions:
•Mechanical protection (IP65)
•Power supply for the electrical bus termination
•Transducer excitation
•Bus operation for 2-wire and 4-wire RS-485 serial interfaces
•EMC-tested
The connection cable exits the casing via screw connections.
Bus termination switch
Bus-output
8th input /
Bus-input
Fig. 1: Mechanical construction of the VK...

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2.1 Mounting
The VK... junction boxes should preferably be mounted such that the cable
bushings point downward (see mounting direction, fig. 2). In this way, better
protection against ingress of water is provided.
(250)
(260)
(100)
(110)
(128)
(264.1)
278
0
25
50
75
100 125 150
175
200
with rubber sealing (mounted) 37.5
7x M12, a.f. 14 for
cable diameter
3 ... 6 mm
2x M16, a.f. 17 for
cable diameter
5 ... 9 mm
Mounting direction ∅7
Fig. 2: Mounting dimensions of the VK...
Junction box top view
1. 4.
2.
3.
Tighten the mounting screws in the following order:
Tightening torque of the cover
plate screws: 0.7 N⋅m
Fig. 3: Tightening the mounting screws
CAUTION
Please tighten the cover plate screws with a torque of 0.7 Nm to ensure the
specified IP degree of protection and maximum EMC protection.

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3 Electrical connection
A connection diagram is attached to the lid of the VK.... When making the
connections, please ensure that the cable wires do not protrude beyond the
connection clamps (risk of looping). Make sure that the cable screen is
properly connected to the screw connections.
3.1 Cable connection
Only an interconnecting cable with a screen grounded on two sides (and
metal connectors) is to be used as the connecting cable between the VK...
and its partner. The screen is brought extensively into contact on both sides at
the PG gland (and at the casing of the metal connector). If the partner has no
metal connector, the cable screen must be extensively connected to ground. If
there are major ground potential differences between the VK... and the peer,
an equipotential bonding conductor must also be provided.
For optimum results when assembling the cable, proceed as follows:
DCut off outer cable sheath and expose braided screen over a length of
approx. 10 ... 15 mm, depending on the cable diameter.
DPush dome nut and lamellar insert with sealing ring onto the cable.
DBend braided screen outwards at a right angle (90°).
DFold braided screen towards outer sheath, i.e. by another 180°.
DPush gland base up to braided screen and turn briefly around both sides of
the cable axis.
DPush lamellar insert with sealing ring into gland base and snap anti-rotation
element into place.
DFirmly screw on dome nut.
screened cable
Dome nut
Sealing ring
Lamellar insert
Braided screen
Gland body
Fig. 4: Assembly of a connection cable

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3.2 Clamp connection
All nine of the connection blocks in the VK... are interconnected in series. The
VK... also contains terminating resistors that can be brought into circuit for the
RS-485 bus.
Each clamp has the following connections:
VK...-Connection Meaning
Screen screen connection
TA RS-485, transmitting line A (= T−)
TB RS-485, transmitting line B (=T+)
RA RS-485, receiving line A (=R−)
RB RS-485, receiving line B (=R+)
UB Power supply +, max. 30 VDC
GND Power supply ground
TA,TB, RA, RB relate to the 4-wire bus connection.
The screen connection should only be used if it is not possible to connect the
cable screen in the screw connections. With this method, EMC-proofing under
EN 45 501 is restricted, which can lead to errors within the data transmission
when there are electromagnetic interference fields..
The choice of bus wiring depends on the digital transducers / measuring
amplifiers being used (see the table in section 1). A mixed 2-wire / 4-wire bus
version is not possible.
Long line lengths (up to 1000 m) can be implemented with the aid of the
RS-485 bus driver. The length specification relates to all the cabling (electric
main and transducer lines in total).

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3.3 Power supply
The power supply complies with the operating voltage of the digital
transducers / measuring amplifiers connected in the particular case. The
relevant Operating Manual should be consulted for this.
Product Operating voltage range [VDC]
C16i 6...15
FIT, 1st generation 6...15
FIT, 2nd generation 6...30
FIT, 3rd generation 10...30
AED9101B 6...30
AED9201A 18...30
AD104-R4 6...15
AD105 6...15
WE2107M 12...30
WE2108 10...30
WE2110 (DC version) 12...24
DIS2116 10...17 (C16i)
The supply voltage for the VK... is minimum 6 VDC and maximum 30 VDC. The
LED on the circuit board indicates that the supply voltage is present.
When several devices and long cables to carry the supply voltage are
connected, pay attention to the voltage drop over these cables.
3.4 Connection to a computer
The junction box can be wired for two interface variants (2-wire / 4-wire
RS-485).
When connecting digital transducers / measuring amplifiers to the COM port
of a PC (RS-232), you need an interface converter
(from HBM: 1-SC232/422B).
Basically, screened cables should be used for interface wiring, with the cable
screen being connected to the VK... enclosure via the screw connections.
The screen of the electric main is connected to the screen of the transducer
cable via the VK... screw connections (not to the supply ground).

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If necessary, a separate cable should be used to produce equipotential
bonding between the bus nodes. The cable screen must not be used for this
equipotential bonding. For EMC reasons, it is advisable to use a
double-screened cable (from the HBM program, for example: 3 x 2 x 0.14 m2,
4-3301.0071).
SC232/422B Interface converter
RS-232 - RS-485
UB: 8 V...30 VDC
RS-485-Bus digital transducers
TA TA
TB TB
RA RA
RB RB
GND GND
UBUB
Equivalent interface designation
TA = T− TB = T+
RA = R− RB = R+
COM-Port PC
RxD TxD
TxD RxD
GND GND
SUB-D plug SUB-D plug
9-pin 9-pin
PIN PIN
2 = RxD 2 = RxD
3 = TxD 3 = TxD
5 = GND 5 = GND
Fig. 5: Connecting a digital transducer / measuring amplifier (RS-485 4-wire)
to a computer via the interface converter
All the digital transducers/measuring amplifiers are wired in parallel by the
VK.... The transmitting lines only cross the receiving lines at the interface
converter (see Fig. 5).
This does not apply to the RS-485 2-wire bus. Here all the nodes are wired in
parallel (even the master and the interface converter).

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3.5 RS-485 4-wire bus
Using the RS-485 interface, several digital transducers / measuring amplifiers
can be connected to a common bus line. Fig. 6 shows the principle of bus
cabling for 4-line operation.
4-wire electric main
Line
termination Line termination
1000 Ω
1000 Ω
1000 Ω
1000 Ω
1000 Ω
1000 Ω
1000 Ω
Computer = Master Bus nodes: Slave 00...........Slave 31
+5 V
+5 V
+5 V
+5 V
TB
TA
RB
RA
TxD on/off RxD TxD on/off RxD TxD on/off RxD
1000 Ω
Fig. 6: Bus structure of the 4-wire bus (Standard design)
Bus operation of the digital transducers / measuring amplifiers is designed as
a master/slave configuration, with the digital transducers / measuring
amplifiers implementing the slave function.
In the diagram above, the marked terminating resistors of 1000 Ωare
important for the electrical function of the bus system. These resistors
safeguard the rest level for the receiver on the bus line. The electric main
must only be connected to these resistors at the ends of the cables.
For the local distribution of bus connections shown in the diagram, the master
(generally the control computer with an interface converter) and the most remote
VK... contain the terminating resistors. In this VK..., the terminating resistors
must be switched on (switch setting at the bus connection ON). An exception is
the interconnection with the C16i digital load cells and DIS2116 scale electronics
(see Figure 8). The interface converter from HBM basically has bus terminating
resistors that are ON. When using several VK...s, it is then only necessary to
activate the bus termination in one VK.... It is essential for the bus terminations
integrated in the digital transducers / measuring amplifiers to be deactivated
(factory setting).
Rest level (there is no communication) on the RS-485 electric main is
produced in 4-wire operation when:
TB − TA 0.35 V and RB − RA 0.35 V

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HBM A1144-3.0 en/de/fr
3.6 RS-485 2-wire bus
Using the RS-485 interface, several digital transducers / measuring amplifiers
can be connected to a common bus line. Figure 7 shows the principle of bus
cabling for 2-wire operation.
VK... connection RS-485 2-wire
Screen screen connection
TA RS-485, TRA = transmitting / receiving line A (=TRA−)
TB RS-485, TRB = transmitting / receiving line B (=TRB+)
RA Not in use
RB Not in use
UB Supply voltage +, max. 30 VDC
GND Power supply ground
2-wire electric main
Line
termination Line termination
1000 Ω
1000 Ω1000 Ω
1000 Ω
+ 5 V + 5 V
Computer = Master Bus nodes: Slave 00.......Slave 31
T/RA
TxD on/off RxD TxD on/off RxD TxD on/off RxD
T/RB
Fig.7: Bus structure of the 2-wire bus RS-485 (T/RB = T/R+, T/RA = T/R−)
Bus operation of the digital transducers / measuring amplifiers is designed as
a master/slave configuration, with the digital transducers / measuring
amplifiers implementing the slave function. All nodes (even the master) are
wired in parallel.
In the diagram above, the marked terminating resistors of 1000 Ωare
important for the electrical function of the bus system. These resistors
safeguard the rest level for the receiver on the bus line. The electric main
must only be connected to these resistors at the ends of the cables.

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VKK2R-8 DIGITAL, VKD2R-8
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For the local distribution of bus connections shown in the diagram, the master
(generally the control computer with an interface converter) and the most
remote VK... contain the terminating resistors. In this VK..., the terminating
resistors must be switched on (switch setting at the bus connection ON). The
interface converter from HBM basically has bus terminating resistors that are
ON. When using several VK...s, it is then only necessary to activate the bus
termination in one VK.... Switchable BUS terminations in the digital
transducers / amplifiers must be turned off.
For 2-wire operation, the HBM interface converter must be set accordingly
(see 1-SC232/422B Operating Manual). However, here the digital transducers
/ measuring amplifiers must be operated in half-duplex mode (it is essential to
set the COFxxx command). The MSV?0; command must not be used, as it is
not possible to interrupt data output with the STP; command.
Rest level (there is no communication) on the RS-485 electric main is
produced in 2-wire operation when:
T/RB − T/RA 0.35 V
Communication between the master and the slaves is executed as half-duplex
communication (sending a request through the master, then receiving the
response from the selected slave).

16 VKK2R-8 DIGITAL, VKD2R-8
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3.7 Connecting VKD2R-8 with DIS2116
VK...
(input, Si-
gnals from
C16i)
RS-485 4-wire VK...
(output) DIS2116
(Clamp
K1)
screen connection Screen 1.1
TA RS-485, transmitting line A (=T−) TA 1.7 (RA)
TB RS-485, transmitting line B (=T+) TB 1.6 (RB)
RA RS-485, receiving line A (=R−) RA 1.5 (TA)
RB RS-485, receiving line B (=R+) RB 1.4 (TB)
GND Power supply ground GND 2.4
UB Power supply +, max. 17 VDC UB 2.3
Fig. 8: Following the scheme of measuring C16i − VKD2R−8 − DIS2116

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VKK2R-8 DIGITAL, VKD2R-8
HBMA1144-3.0 en/de/fr
4 VK... Specifications
Type VK...
Bus RS-485 / RS-422
Cable length (entire bus) m 1000
HBM products to connect 4-wire bus 2-wire bus
Digital transducers C16i, FIT
Digital transducer electronics AED9101B,
AED9201A AED9101B
Digital meas.chains with transducer electronics AD104-R5 AD105
Weighing electronics WE2107M
WE2108,
WE2110
Digital scale electronics DIS2116 DIS2116
Power supply (for active bus termination)
Operating voltage1) (DC) V 6...15...30
Current consumption (bus termination only) mA  30
Temperature range
Nominal (rated) temperature range °C [°F] −10...+60 [14...140]
Operating temperature range °C [°F] −20...+70 [-4...158]
Storage temperature range °C [°F] −40...+85 [-40...185]
Miscellaneous
Dimensions (L x W x H) mm 200 x 65 x 40
Material
Housing stainless steel
Dome nut Brass, nickel plated
Clamping cone Neoprene
Weight, approx. g 800
Degree of protection as per EN 60592 (IEC529) IP65
1) Depending on the load cell / measuring amplifier connected
In its screened configuration (see section 3), the complete measurement
chain including the digital transducers / AED is not sensitive to HF radiation
and conducted interference in accordance with OIMLR76, EN45501 or
EN61326.

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Inhalt Seite
Sicherheitshinweise 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Einleitung und bestimmungsgemäße Verwendung 22. . . . . . . .
2 Mechanischer Aufbau 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Montage 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Elektrischer Anschluss 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Kabelanschluss 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Klemmenanschluss 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Spannungsversorgung 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Anschluss an einen Rechner 27. . . . . . . . . . . . . . . . . . . . . . . .
3.5 RS-485-4-Draht-Bus 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 RS-485-2-Draht-Bus 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7 VKD2R-8 − Verschaltung mit DIS2116 und C16i 32. . . . . . .
4 Technische Daten des VK... 33. . . . . . . . . . . . . . . . . . . . . . . . . . . .

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VKK2R-8 DIGITAL, VKD2R-8
HBMA1144-3.0 en/de
HINWEIS
Die vorliegende Montageanleitung beschreibt die Klemmenkästen VKK2R-8
und VKD2R-8. Beide sind hinsichtlich Aufbau und Handhabung absolut iden-
tisch. In dieser Unterlage wird die Typenbezeichnung mit VK... abgekürzt.
Sicherheitshinweise
Bestimmungsgemäßer Gebrauch
Der Klemmenkasten ist ausschließlich für die Zusammenschaltung der
Schnittstellen, der Spannungsversorgung und dem Busabschluß vorgesehen.
Jeder darüber hinausgehende Gebrauch gilt als nicht bestimmungsgemäß.
Zur Gewährleistung eines sicheren Betriebes darf der Klemmenkasten nur
nach den Angaben in der Montageanleitung verwendet werden. Bei der Ver-
wendung sind zusätzlich die für den jeweiligen Anwendungsfall erforderlichen
Rechts-und Sicherheitsvorschriften zu beachten. Sinngemäß gilt dies auch
bei Verwendung von Zubehör.
Der Klemmenkasten ist kein Sicherheitselement im Sinne des bestimmungs-
gemäßen Gebrauchs. Der einwandfreie und sichere Betrieb dieses Klemmen-
kastens setzt sachgemäßen Transport, fachgerechte Lagerung, Aufstellung
und Montage sowie sorgfältige Bedienung und Instandhaltung voraus.
Allgemeine Gefahren bei Nichtbeachten der Sicherheitshinweise
Der Klemmenkasten entspricht dem Stand der Technik und ist betriebssicher.
Von den Klemmenkasten können Restgefahren ausgehen, wenn sie von un-
geschultem Personal unsachgemäß eingesetzt und bedient werden.
Jede Person, die mit Aufstellung, Inbetriebnahme, Wartung oder Reparatur
eines Klemmenkastens beauftragt ist, muß die Montageanleitung und insbe-
sondere die sicherheitstechnischen Hinweise gelesen und verstanden haben.
Symbol:
Bedeutung: CE-Kennzeichnung
Mit der CE-Kennzeichnung garantiert der Hersteller, daß sein Produkt den An-
forderungen der relevanten EG-Richtlinien entspricht. Die Konformitätserklä-
rung finden Sie unter www.hbm.com.

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Restgefahren
Der Leistungs- und Lieferumfang des Klemmenkastens deckt nur einen Teil-
bereich der Anschlußtechnik ab. Sicherheitstechnische Belange der An-
schlußtechnik sind zusätzlich vom Anlagenplaner/Ausrüster/Betreiber so zu
planen, zu realisieren und zu verantworten, daß Restgefahren minimiert wer-
den. Jeweils existierende Vorschriften sind zu beachten. Auf Restgefahren im
Zusammenhang mit der Anschlußtechnik ist hinzuweisen.
In dieser Montageanleitung wird auf Restgefahren hingewiesen:
Symbol: HINWEIS
Weist darauf hin, daß wichtige Informationen über das Produkt oder über die
Handhabung des Produktes gegeben werden.
Verbot von eigenmächtigen Umbauten und Veränderungen
Der Klemmenkasten darf ohne unsere ausdrückliche Zustimmung weder kon-
struktiv noch sicherheitstechnisch verändert werden. Jede Veränderung
schließt eine Haftung unsererseits für daraus resultierende Schäden aus.
Qualifiziertes Personal
Der Klemmenkasten ist nur von qualifiziertem Personal ausschließlich ent-
sprechend der technischen Daten in Zusammenhang mit den nachstehend
ausgeführten Sicherheitsbestimmungen und Vorschriften einzusetzen. Hierbei
sind zusätzlich die für den jeweiligen Anwendungsfall erforderlichen Rechts-
und Sicherheitsvorschriften zu beachten. Sinngemäß gilt dies auch bei Ver-
wendung von Zubehör.
Qualifiziertes Personal sind Personen, die mit Aufstellung, Montage, Inbe-
triebsetzung und Betrieb des Produktes vertraut sind und die über die ihrer
Tätigkeit entsprechende Qualifikationen verfügen.
Bedingungen am Aufstellungsort
Schützen Sie den Klemmenkasten vor der Einwirkung von Schmutz und
Feuchtigkeit.
Wartung
Der Klemmenkasten ist in Schutzart IP65 ausgeführt (Staubschutz, Schutz
gegen Strahlwasser). Kontrollieren Sie in gewissen Zeitabständen die Dicht-
funktion der Gummidichtung des Deckels und der Verschraubungen.
Unfallverhütung
Die einschlägigen Unfallverhütungsvorschriften sind zu berücksichtigen.