KNF SIMDOS FEM 1.10KT.18S User manual

KNF Flodos BA_SIMDOS_EN_02_160044.docx
Translation of original operating manual Please keep for future reference!
Diaphragm metering pump
SIMDOS
®
Operating Manual
It is important to read and
comply with all instructions in
this operating and installation
manual.
An additional letter before
the FEM model code is a
country-specific designation,
with
no technical relevance.
KNF FLODOS AG
Wassermatte 2
6210 Sursee, Switzerland
Tel. [phone]
Fax [phone]
www.knf
-flodos.ch
[e-mail]
FEM 1.10 KT .18 S
.18
1.10
FEM / UFEM
S / RC
-
/
PMLxxxx / PLxxxx [Cha
p
t
. 1]
K
T / TT / FT
[Cha
p
t
. 4]

Items included on delivery:
SIMDOS metering pump
Mains plug
RC cable (for RC version only)
Operating manual
Brief user guide
Operating manual CD-ROM
Connection kit: hose and screw connectors
Safety provisions
The SIMDOS 10 metering pump complies with the safety
provisions of the EC low-voltage directive 2006/95/EC and the EC
directive on electromagnetic compatibility 2004/108/EG. The
following standards are applicable:
EN 61010-1
EN 61326-1
Contents Page Contents Page
1. About this document 3
1.1. Use of the operating and installation manual3
1.2. Symbols and flags 3
2. Use 4
2.1. Intended use 4
2.2. Improper use 4
3. Safety 5
4. Technical data 7
4.1. Pump materials 7
4.2. Hydraulic ratings 7
4.3. Accuracy / reproducibility 8
4.4. Hydraulic connections 8
4.5. Electrical data 9
4.6. Other parameters 9
4.7. External drive (RC version only) 10
5. Structure and operation 11
5.1. Metering pump structure 11
5.2. Operating principle 11
5.3. Metering pump functions 12
5.4. Functions overview 13
6. Assembly and connection 14
6.1. Assembly 14
6.2. Electrical connection 14
6.3. External drive (RC version) 15
6.4. Hydraulic connection 16
6.5. Shutdown 18
6.6. Transport and interim storage 18
7. Operation 18
7.1. Initial start-up 18
7.2. Operating controls 19
7.3. Main display 19
7.4. Switching the pump on and off 20
7.5. Starting the pump 21
7.6. Interrupting a pumping operation 21
7.7. Stopping the pumping operation 21
7.8. Entering settings 22
7.9. Specified flow 24
7.10. Flow unit 24
7.11. Timeout with time counter 24
7.12. Priming 25
7.13. Fluid type 25
7.14. Calibration 26
7.15. System settings 27
7.16. Back to main menu 27
7.17. Language setting 27
7.18. Auto start 28
7.19. Contrast 29
7.20. Reset 29
8. RC version – external drive 30
8.1. External drive analogue input 30
8.2. Digital input 1, Start/Stop 32
8.3. Digital input 2, Reset/Prime/Pedal switch 34
8.4. Digital output 36
9. Maintenance 37
9.1. Maintenance plan 37
9.2. Cleaning 37
9.3. Cleaning/replacing valve plates and pump
diaphragm 38
10. Troubleshooting 42
11. Spare parts and accessories 44
11.1. Spare parts 44
11.2. Accessories 44
12. Decontamination statement 45
KNF FLODOS AG
Wassermatte 2
6210 Sursee, Switzerland
Tel. [phone]
Fax [phone]
www.knf-flodos.ch
[e-mail]

SIMDOS diaphragm metering pump About this document
KNF Flodos BA_SIMDOS_EN_02_160044.docx
Translation of original operating manual 3
1. About this document
1.1. Use of the operating and installation manual
The operating and installation manual forms an integral part of the
pump.
Please be sure to pass the manual on to the next owner of the
device.
Specifications and instructions for customer-specific project pumps
(model numbers beginning with “PL” or “PML”) may differ from
those set down in the operating and installation manual.
For project pumps, it is also necessary to observe the agreed
specifications.
1.2. Symbols and flags
Warning symbol
WARNING
Warning regarding a potential danger.
Possible consequences of failure to comply with the
warning. The word used, e.g. “warning”, indicates
the level of danger present.
Precautions required to prevent the danger and
its consequences.
Levels of danger
Word Meaning Consequences of non-
compliance
DANGER
Warning of an
imminent danger
Death or serious injury, or major
damage to property
WARNING
Warning of a
potential danger
Possible death or serious injury,
or major damage to property
CAUTION
Warning of a
potentially
dangerous
situation
Possibility of slight injury or
damage to property
Tab. 1: Levels of danger
Other flags and symbols
Identifies an action (step) to be carried out.
1. Identifies the first step of an action. Further numbered steps
follow.
Identifies important information.
Project pumps

Use SIMDOS diaphragm metering pump
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2. Use
2.1. Intended use
The pump is a fluid pumping and metering device.
Operator’s responsibility
The pump must be installed and operated only in accordance with
the operating parameters and conditions described in Chapter 4,
Technical data.
Protect the pump from moisture.
The pump may be operated only when fully assembled.
Before use, check that the materials of the pump head, housing,
diaphragm and valves are compatible with the pumped medium.
Before starting to pump, check that the medium can be pumped
safely in this specific situation.
The temperature of the medium must be within the permitted
temperature range (see Chapter 4).
The pumping medium must not contain any solids, since these
could impair the pump’s operation. If the presence of solids cannot
be prevented, a filter of < 50 µm and with a sufficient filter area
must be installed upstream from the pump.
2.2. Improper use
The pump must not be operated in a potentially explosive
atmosphere.
The party commissioning the pump is responsible for ensuring
compliance with relevant standards if the pump is used in the
medicine or food sectors.
Operating parameters and
conditions
Requirements for pumped
medium

SIMDOS diaphragm metering pump Safety
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3. Safety
Note the safety notes in Chapter 6, Assembly and connection,
and Chapter 7, Operation
The pump is constructed according to the generally accepted rules
of the technology, and occupational health and safety and
accident prevention provisions. Hazardous situations with the
possibility of injuries to the user or other persons, or damage to
the pump or other property, may, however, occur during use of the
device.
The pump must be operated only in technically sound condition
and for its intended purpose, with due regard for safety and
potential hazards and in accordance with this operating and
installation manual.
Ensure all persons working with the pump have been appropriately
trained and familiarised with its use, or are qualified personnel.
This applies particularly to the assembly, connection and
maintenance of the equipment.
Ensure that relevant personnel have read and understood this
operating and installation manual, particularly the chapter on
safety.
Accident prevention and safety rules must be observed at all times
while working on or using the pump.
When pumping a hazardous medium, always observe the safety
rules for the medium in question.
Always comply with instruction signs placed on the pump, such as
flow direction arrows and the type plate, and keep these in a
clearly legible condition.
All replacement parts must be stored and disposed of in
accordance with the precautions required under environmental
protection provisions. It is important to comply with both national
and international regulations. This applies particularly to parts that
have been contaminated with toxic materials.
Dispose of all packaging in an environmentally appropriate
manner. The packaging materials are recyclable.
Ensure that the pump is disposed of in an environmentally
appropriate manner at the end of its useful life. Use
appropriate waste collection systems for the disposal of end-
of-life equipment. Used pumps contain valuable recyclable
materials.
Personnel
Safety awareness
Hazardous media
Signs
Environmental protection
Disposal

Safety SIMDOS diaphragm metering pump
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The pumps are in accordance with the requirements of the
guidelines 2011/65/EU (ROHS2)
The pump complies with all relevant provisions of the following
directives: the EC machinery directive 2006/42/EC, safety
provisions of the EC low-voltage directive 2006/95/EC and the EC
directive on electromagnetic compatibility 2004/108/EC.
The following harmonised standards are met:
EN 61010-1
EN 61326-1
All repairs to the pump must be carried out solely by the
accredited KNF customer service entity.
Use only KNF original parts for all maintenance work.
EU directives/standards
Customer service and repairs

SIMDOS diaphragm metering pump Technical data
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4. Technical data
4.1. Pump materials
For KT models:
Sub-assembly Material
1
)
Pump head PP
Valve plate / seals FFKM
Diaphragm PTFE-coated
Housing PP
Tab. 2: KT 1) according to DIN ISO 1629 and 1043.1
For TT models:
Sub-assembly Material
1)
Pump head PVDF
Valve plate / seals FFKM
Diaphragm PTFE-coated
Housing PP
Tab. 3: TT 1) according to DIN ISO 1629 and 1043.1
For FT models:
Sub-assembly Material
1)
Pump head PTFE
Valve plate / seals FFKM
Diaphragm PTFE-coated
Housing PP
Tab. 4: FT 1) according to DIN ISO 1629 and 1043.1
4.2. Hydraulic ratings
Parameter Value
Flow rate [ml/min]
1), 2)
1–100
Max. metering volume [ml] 1–1,000
Metering time [mm:ss] [hh:mm] 1s – 99h59min
Flow rate scale range 1:100
Accuracy
3)
+/- 2%
Reproducibility
3)
+/- 1%
Permitted pressure
[bar above atmospheric]
6
Suction head [m water column] 3
Permitted medium viscosity [cSt]
4)
150
Tab. 5: Hydraulic ratings
1) Measured with water at 20°C
2) Flow rates may vary from the values shown according to fluid viscosity,
pump head material and the hoses / hose connectors used. Calibration
with the pumped medium is required.
3) For calibrated pump and constant environmental conditions (see
section 5.5)
4) Lower flow rate for fluid type setting “Visk500cSt” (see section 7.13).

Technical data SIMDOS diaphragm metering pump
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4.3. Accuracy / reproducibility
The accuracy of the metering pump is appropriately characterised
by the maximum absolute error A and the maximum relative error
B.
max. inaccuracy ≤ A + B
Error Value
Absolute error A ≤ ± 1‰ nominal value
Relative error B ≤ ±1.9% setting value
Tab. 6: Error A and error B
Example:
SIMDOS
®
10, nominal value of 100 ml/min
For a setting of 20 ml/min, the accuracy should therefore be within
the following error limits:
Inaccuracy ≤ (±1‰ x 100ml/min) + (±1.9% x 20ml/min)
≤ (±0.1ml/min) + (±0.38ml/min)
≤ ±0.48ml/min
≈±2% of setting value
In constant environmental conditions and with the same hose
connection configuration, the pump achieves a reproducibility of
better than ±1%.
Greater inaccuracies may occur for fluids with a viscosity of
> 150 cSt or with a tendency to gassing out. Appropriate
adjustments may be made during calibration.
The metering pump has been calibrated to its nominal flow rate in
the factory. The specified flow rate is for water at 20°C with free
discharge flow.
The flow rate may differ from the calibrated value for some
applications, according to the medium, its viscosity, density and
temperature, pressure and installation type (e.g. cross-section
constrictions). For accurate metering, it is therefore desirable to
calibrate the metering pump (see section 7.14).
4.4. Hydraulic connections
Pump model Connection type
FEM 1.10 KT, TT Hose fitting,
i.d. 4mm / o.d. 6mm
FEM 1.10 FT Internal thread NPT 1/8
Hose fitting,
i.d. 4mm / o.d. 6mm
UFEM 1.10 KT, TT Hose fitting,
i.d. 1/8”, o.d. 1/4”
UFEM 1.10 FT Internal thread NPT 1/8
Hose fitting,
i.d. 1/8”, o.d. 1/4”
Tab. 7: Hydraulic connections
Accuracy
Reproducibility
Factory calibration
Calibration

SIMDOS diaphragm metering pump Technical data
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4.5. Electrical data
Parameter Value
Nominal mains voltage [V] 100–240 V AC +/- 10%
Frequency [Hz] 50–60 Hz
Maximum current consumption
AC 100 V / 115 V / 240 V [A]
0.1 / 0.09 / 0.05
Max. watt consumption [W] 10
Pump DC voltage [V] 24 V DC
Max. current consumption, DC
RMS 24 V [A]
0.4
Max. short-term peak current [A] 1.7
Power supply protection Electronic overload protection
Pump protection Electronic overload protection
Pump protection type IP 65
Power supply protection type IP 40
Tab. 8: Electrical data
4.6. Other parameters
Parameter Value
Permitted ambient temperature +5 to +40°C
Permitted medium temperature +5 to +80°C
Rated speed 200 rpm
Service life > 10,000 h (100 million strokes)
Noise level < 40dBA
Pump weight
1)
0.9 kg
Tab. 9: Other parameters
1) Pump weight may differ slightly for some pump versions.

Technical data SIMDOS diaphragm metering pump
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4.7. External drive (RC version only)
Parameter Value
Analogue input
Signal range 0–10 V, 4–20 mA, 0–20 mA
Input resistance [Ω] 13.9 kΩat 0–10 V
470 Ωat 4–20 mA
470 Ωat 0–20 mA
Electric strength [V] TTL 24 V DC
Digital input
Signal range Pull up at 24 V
Electric strength [V] TTL 24 V DC
Low level (ON) < 0.8 V = low
High level (OFF) > 2.0 V = high
Digital output
Electric strength, open collector
[V] TTL
24 V DC
Load capability, open collector
[V] TTL
10 mA
Tab. 10: External drive
1
Analogue input
brown
2Digital input 1
white
3Digital input 2
blue
4Open collector output
black
5 Ground
grey
Fig. 1: RC cable pins
Pin No. Wire colour Description Function
1 Brown Analogue input 0% to 100% up to flow
rate
2 White Digital input 1 Start/stop
3 Blue Digital input 2 Reset / prime / pedal
switch
4 Black Digital output Various output signals
5 Grey Ground --
Tab. 11: RC cable pins

SIMDOS diaphragm metering pump Structure and operation
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5. Structure and operation
5.1. Metering pump structure
1
STOP button
2 START button
3 Display
4 Control knob
5Inlet
6Pump head
7Outlet
8Power supply plug
9External drive plug
(RC version only)
Fig. 2: Diaphragm pump
5.2. Operating principle
1
Exhaust valve
2Inlet valve
3Working chamber
4Diaphragm
5Eccentric
6Connecting rod
7Pump drive
Fig. 3: Pump structure
Diaphragm fluid pumps are based on reciprocating displacement
pump technology. An elastic diaphragm (4) is moved up and down
by the eccentric (5) and the connecting rod (6). During the down
stroke, the diaphragm sucks in the medium through the inlet valve
(2). During the up stroke, it forces medium out of the pump head
through the exhaust valve (1). The diaphragm hermetically seals
off the working chamber (3) from the pump drive (7).
SIMDOS
®
diaphragm metering pumps are fitted with a patented
drive system. The suction stroke is always driven at maximum
speed, but the exhaust process is varied according to the selected
speed, ensuring maximum possible uniformity of discharge during
the entire stroke (see Fig. 4). This results in a low-pulsation, quasi-
continuous pumping process. This is the key difference between
SIMDOS
®
metering pumps and diaphragm metering pumps with
linear magnet diaphragm drive or with conventional eccentric
diaphragm drive.

Structure and operation SIMDOS diaphragm metering pump
KNF Flodos BA_SIMDOS_EN_02_160044.docx
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100% flow rate 1% flow rate
Fig. 4: Low-pulsation operating principle
The characteristic curve for the suction and exhaust strokes can
also be adapted to the medium by setting the appropriate fluid
type (see section 7.13).
5.3. Metering pump functions
Operating modes
In this case, the device pumps at a constant flow rate.
Fig. 5: Continuous pumping
In this case, the device pumps at a constant flow rate, then
switches off after a specified time.
Fig. 6: Continuous pumping with timeout
Pumping of a specified volume in a specified time.
Fig. 7: Metered volume with timeout
Continuous pumping
Continuous pumping with
timeout
Metered volume

SIMDOS diaphragm metering pump Structure and operation
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5.4. Functions overview
Main menu
1. Flow rate 1–100 ml/min or
metered volume 1–1,000 ml
2. Timeout/metering time
3. High-speed operation for priming or emptying
4. Pump calibration
5. Setting the pump for characteristics of the medium
- Standard: Aqueous media
- Degassing: Media with low boiling temperature
- Visk100cSt: Media up to 100 cSt
- Visk500cSt: Media up to 500 cSt
6. Go to system menu
System menu
7. Return to main menu
8. Selecting operating menu language
9. Analogue input: 0% to 100% flow rate *
0–10 V / 0–20 mA / 4–20 mA
10. Digital input 1: Start/stop with level or pulse signal via logic
input *
11. Digital input 2: Reset or high-speed via logic input *
12. Digital output: User selection of logic signal type: *
- Error/alarm - Motor turns (level)
- End of metering volume - Motor pulses
- Volume pulses (one pulse per 100 µl)
13. Autostart function (pump starts automatically when power
supply switched on)
14. Set display contrast
15. Reset pump to factory settings
16. Return to main menu
* RC functions are available for RC pumps only. See Chapter 8
for further details of the external drive system.
Fig. 8: Main menu
Fig. 9: System menu

Assembly and connection SIMDOS diaphragm metering pump
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6. Assembly and connection
All pumps must be installed only in accordance with the operating
parameters and conditions described under Technical data (see
Chapter 4).
Note the safety instructions in Chapter 3.
6.1. Assembly
Store at the assembly location prior to assembly so that the
pump is at the same temperature as the surrounding
environment.
Pump dimensions (see Fig. 10)
Fig. 10: Mounting measurements (measurement tolerances as per DIN
ISO 2768-1, tolerance class V)
Ensure that the installation location is dry, and protected from
water in the form of rain, spray, splashes and drips.
Select a level surface that will provide a firm base for the
pump.
When choosing the location, ensure that the hose connections
can be fitted without strain on the hoses. Do not pull on the
hoses, and avoid kinks and bends.
Protect the pump from dust.
Protect the pump from vibrations and impacts.
The pump is designed to be installed in an upright position.
Two additional mounting screws can be inserted from the
bottom of the pump base (see Fig. 10).
6.2. Electrical connection
Dimensions
Installation location
Installation position

SIMDOS diaphragm metering pump Assembly and connection
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Electrical connections must comply with relevant standards,
directives, regulations and industry standards.
1. Connect the mains plug cable to the socket in the pump.
2. Plug the mains plug into a correctly installed and properly
earthed mains socket.
Fig. 11: Electrical connection
The pump must be connected only to a correctly installed and
properly earthed mains socket.
Ensure that the mains plug is protected from water splashes.
CAUTION
Safety note
Always remove the mains plug
from the socket before carrying
out any work on the pump.
6.3. External drive (RC version)
1. Fit an appropriate plug on the external drive cable (RC cable)
for the control unit to be used. For pin allocations, see section
4.6, Table 10 and Fig. 1).
2. Remove protective cover from the RC plug.
3. Connect the RC cable to the pump.
Signals and load capacity (see section 4.6).
RC functions (see Chapter 8).
RC cable

Assembly and connection SIMDOS diaphragm metering pump
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6.4. Hydraulic connection
All components connected to the pump must be designed for
the hydraulic ratings of the pump (see Chapter 4).
All hoses used must be designed for the maximum permitted
operating pressure of the pump (see Chapter 4).
All hoses used must have sufficient chemical resistance to the
pumped fluids.
The connections described below apply to standard products.
Different connections may apply for customer-specific projects
(PML or PL).
The direction of flow is marked on the pump head.
The suction line should be kept as short as possible, to reduce
the priming time.
Clamp ring / hose connection fitting,
FEM 1.10KT, FEM 1.10TT, UFEM 1.10KT, UFEM 1.10TT
1
Hose
2Union nut
3Clamp ring
4Connector
Fig. 12: 4/6 hose / clamp ring connection fitting (FEM)
1/8” / 1/4” hose / clamp ring connection fitting (UFEM)
1. Remove protective covers from the connections.
2. With a sharp knife, cut the suction and pressure lines
(FEM: hose with i.d. 4 mm, o.d. 6 mm; UFEM: hose with i.d.
1/8”, o.d. 1/4”) to the required length, with square straight
edges.
3. Push the union nut (2) and clamp ring (3) onto the hose (1).
4. Push the hoses onto the connectors as far as they will go.
5. Hand-tighten the union nut (2).
6. Check that the hoses and hose/connector transitions are
correctly and securely attached.
7. Check the tight seal of the installed fittings.
Connected components
Hoses
Customer-specific
pumps (PL, PML)

SIMDOS diaphragm metering pump Assembly and connection
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Cutting ring / hose connection fitting with threaded socket
FEM 1.10FT, UFEM 1.10FT
1
Hose
2Threaded socket
3Teflon sealing tape
4Union nut
5Cutting ring
6Sealing ring
7Connector
Fig. 13: 4/6 hose / cutting ring FT connection fitting
1. Remove protective covers from the connections.
2. Screw the threaded socket (2) with Teflon sealing tape (3) into
the pump head.
Do not apply excessive torque to the threaded socket. This
could damage the thread.
3. Using a sharp knife, cut the suction and pressure lines (FEM:
hose with i.d. 4 mm, o.d. 6 mm; UFEM: hose with i.d. 1/8”, o.d.
1/4”) to the required length, with straight square edges.
4. Push the union nut (4), cutting ring (5) and sealing ring (6)
onto the hose (1).
Push the cutting ring and sealing ring over the hose only far
enough for the hose end to protrude around 1 mm.
5. Push the hoses onto the connectors as far as they will go.
6. Hand-tighten the union nut (4).
7. Check that the hoses and hose/connector transitions are
correctly and securely attached.
8. Check the tight seal of the installed fittings.
Fig. 14: Position of cutting ring and
sealing ring on hose

Operation SIMDOS diaphragm metering pump
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6.5. Shutdown
On completion of the pumping operation, flush the entire
system and the pump with a neutral fluid, then pump it empty.
To ensure satisfactory start-up when the unit is again required,
it is important to ensure that the pump is free of any
crystallising, adhesive or curing media.
Press the STOP button to end the pumping operation.
Unplug the pump from the power supply.
6.6. Transport and interim storage
When packing the unit, ensure that the consignment will not be
able to move within the packing.
Choose sufficiently robust packing so that the entire consignment
will withstand unfavourable transport conditions.
Use the original packaging.
7. Operation
7.1. Initial start-up
Before switching on the pump, check the following points:
Prerequisites for start-up
All hoses must be correctly attached.
Specifications of the power supply must correspond with
the data on the pump type plate and the mains plug.
The pump outlet must be clear of any obstruction.
All cables must be correctly connected.
Tab. 12: Prerequisites for start-up
Operate the pump only in accordance with the operating
parameters and conditions described under Technical data
(see Chapter 4).
Ensure the pump is being used for its intended purpose (see
section 2.1).
Avoid any improper use of the pump (see section 2.2).
Note the safety instructions in Chapter 3.
If the lines are blocked lines a diaphragm pump can build up
higher pressures than the maximum allowed limits which can
either damage the pump or system.

SIMDOS diaphragm metering pump Operation
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If it is possible that pressures in excess to the limits can occur
it is important to take the necessary measures, e.g. a pressure
relief valve or pressure sensor.
For further assistance contact your local KNF specialist.
Never apply positive pressure to the suction side of the pump.
A small positive pressure of less than 0.5 m water column will
cause the pump to block flow in the pumping direction. On the
application of any higher pressures than this, the pump will
allow the fluid to pass through in the pumping direction.
This can be prevented by using a suitable check / pressure
valve* on the outlet side of the pump.
* e.g. Pressure Control Valve FDV30 from KNF Flodos
7.2. Operating controls
1
STOP button
2 START button
3 Display
4 Control knob
Fig. 15: Operating controls
7.3. Main display
The main display shows the principal pump settings.
1
Specified flow
2 Flow unit
3 Time counter
4 Volumeter
5External drive
6Autostart
7Analogue input
8 Digital input 1
9Digital input 2
10 Operating condition
display
Fig. 16: Main display

Operation SIMDOS diaphragm metering pump
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Displays the set flow rate (1) if the unit (2) has been set on
“ml/min”.
Displays the metering volume (1) if the unit (2) has been set on
“ml”.
Displays the pump running time.
Upward count (3) if no timeout has been programmed.
Elapsed time display.
Downward count (3) if a timeout (metering) has been
programmed. Time remaining display.
Display of delivery volume (4) since last pump start-up.
Displays whether pump external drive has been activated, and the
external drive condition (5, 7, 8, 9).
Displays whether pump has been set on Autostart (6).
Displays whether the pump is operating, stopped or paused (10).
7.4. Switching the pump on and off
The default setting is for the pump to remain off when the mains
power supply is switched on.
Switch on
Briefly press the “STOP” button – the pump will switch on.
The display lights up, and the pump is ready for use.
Switch off
Hold the “STOP” button down for at least 2 seconds.
The pump will now switch off completely.
Standby
When the pump is stopped, after ten minutes without any user
input the device switches into standby condition (display goes
dark).
However, the pump is still ready for use immediately when
required.
Press “STOP” or any other key to reactivate the pump from
standby condition.
The external drive reactivates the pump from standby as soon
as a control signal is present.
Specified flow and unit
Time counter
Volume meter
External drive
Auto start
Operating condition
Fig. 17: Switching the pump on
Hold down for 2 seconds
Fig. 18: Switching the pump off