Kobold SMO Series User manual

Operating Instruction
for
Flow Meter / Monitor
Model: SMO-...
SMW-...

SMO/SMW
Page 2 SMO/SMW K13/0322
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulation Use ............................................................................................. 4
5.Operating Principle ........................................................................................ 4
6.Mechanical Connection ................................................................................. 5
7.Electrical Connection .................................................................................... 6
7.1.with Plug Connection (not for SMO-2..and SMW-2) ............................ 6
7.2.Examples for Contact Protection Measures ......................................... 6
8.Commissioning.............................................................................................. 7
9.Maintenance ................................................................................................. 8
10.Technical Information .................................................................................... 9
11.Order Codes ............................................................................................... 10
12.Dimensions ................................................................................................. 12
13.Recommended Parts .................................................................................. 13
14.EU Declaration of Conformance (SMO/SMW) ............................................ 14
15.UK Declaration of Conformity (SMO/SMW) ................................................ 15
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

SMO/SMW
SMO/SMW K13/0322 Page 3
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EC-machine guidelines.
PED 2014/68/EU
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the PED
2014/68/EU no CE mark.
Table 8, Pipe, Group 1 dangerous fluids
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 Flow Meter / Monitor, model SMW-, SMO-

SMO/SMW
Page 4 SMO/SMW K13/0322
4. Regulation Use
Any use of the Flow Meter / Monitor, which exceeds the manufacturer’s
specifications, may invalidate its warranty. Therefore, any resulting damage is not
the responsibility of the manufacturer. The user assumes all risk for such usage.
The Flow Meter / Monitor, model: SMW/SMO, is used for measuring and
monitoring liquid flow. Only clean, low viscosity and homogeneous media may be
measured, which do not affect the materials used in the instrument casing. Large
measuring errors will occur when using high viscosity media. Large dirt particles
may lead to blocking of the float and therefore large measurement and signal
errors. Ferritic particles that deposit on the float body (with internal magnet) may
also lead to a similar effect. Therefore, we recommend a magnet filter.
The instruments are provided as follows:
Flow measurement
The actual flow may be read locally off the instrument indication, which is
mounted at the side of the housing. The scale shows the flow rate directly in litres
per minute of water.
Limit Value Contacts (not for model SMW-2.. and SMO-2..)
For the monitoring of the flow rate, the instruments may be fitted with one or two
adjustable limit value contacts (reed contacts).
Contact versions:
 N/O contact (standard)
 Changeover contact (standard)
 N/O (cCSAus)
 Changeover (cCSAus)
The contact is adjustable over the entire measuring range. Hysteresis should
however be taken into account.
5. Operating Principle
The Flow Meters / Monitors, model: SMW,
SMO, are based on the principle of the well-
known float type Flow Meters, however
without making use of conventional
measuring pipe that extends conically
upwards. These patented instruments are
provided instead with a cylindrical guide-tube
with conical slots along the periphery. A float
is found in this tube which, by means of the
flow of the medium, is raised in the tube

SMO/SMW
SMO/SMW K13/0322 Page 5
against a force of a spring. Each float position corresponds to a certain flow which
can be read off by means of an indicator, external to the medium.
Permanent magnets are inserted in the float which activates reed switches
mounted outside of the flow throughput. The activation of the contact is carried
out by means of magnetic field, i.e. the contact is hermetically separated from the
flowing medium.
6. Mechanical Connection
Before installation:
 Please ascertain that the allowable maximum
operating pressure and operating temperature of the
instruments are not exceeded
 The instrument should be installed in a vertical (model
SMO-...) or horizontal (model SMW-...) position in the
piping. The flow direction is according to the arrow
direction - from top to bottom (model SMO-...), or left to
right / right to left (model SMW-...).
 Remove all transport locks and ascertain that no
packing material is left within the instrument.
 Sealing of the connection threads should be carried out
with Teflon tape or similar.
 Do not install the instrument within an induction field.
 If possible, check whether the connection joints/pipe
link is fully sealed, immediately after mechanical
installation (see 8. Commissioning).

SMO/SMW
Page 6 SMO/SMW K13/0322
7. Electrical Connection
7.1. with Plug Connection (not for SMO-2..and SMW-2)
 Ensure that the power is disconnected while
connections are made.
 Loosen the holding screw on the plug cap and
remove the cap from the plug.
 Connect the power cable to the plug cap in
accordance with the connection diagram below.
 If the contact has as yet not been adjusted, this
should be carried out at this stage
(see 8. Commissioning).
 Push the plug over contact foot and secure it with
the holding screw.
Attention! The given electrical values of the reed contacts shall not be
exceeded even for short periods of time. For higher switching values, we
recommend contact protection relays or other contact protection
measures.
 After connection of the required external equipment to the limit contacts and
adjustment of the desired switching points, all the connection work is finished.
 The unit may now be set in operation.
7.2. Examples for Contact Protection Measures
For capacitive and inductive loads (long wires and relays/switch) we recommend
the following protective circuit:

SMO/SMW
SMO/SMW K13/0322 Page 7
8. Commissioning
With reference to employment of these instruments in machines, according to the
guidelines 89/392/EWG, commissioning is prohibited unless it is established that
the machine complies with the respective guidelines.
Adjustment of limit values
(Model SMO-3... and SMW-3... with display and contact)
 Loosen both the safety screws on contact-foot with the help
of a screw driver.
 Push the switch-housing downwards.
 Remove the plug-cap from contact-foot, after loosening the
safety screws.
 Connect on pin 1 + 2 (changeover contact PIN 2 + 3) a
suitable conductivity testing device.
Attention! Sudden opening of inflow can lead to
pressure peaks, which overstep the operational
pressure many times. Water hammer! This can
cause the breakage of measuring glass.
Case 1: with installed unit
Open the inlet pipe. Let the medium flow through it slowly, till
the pointer display shows the flow volume of desired switching
point.
Case 2: with not installed unit
Lift up the float with a suitable tool, till the pointer display shows flow volume of
desired switching point.
 The reed contact is now closed (electrical conductivity).
 Push the switch-housing upwards, till the reed contact just opens (No electrical
conduction). The contact is now set for falling flow. If the contact is to be
adjusted for the rising flow, the contact must be repositioned based on
hysteresis, i.e. 3-5 mm downwards.
 In this position tighten the safety screws. Replace the plug cap. The unit is now
ready for operation.
 With correct adjustment of limit-switch, bistable operation is achieved, that
means on surpassing the adjusted limit value the contact closes, and when
falling below the adjusted limit value, the contact open.

SMO/SMW
Page 8 SMO/SMW K13/0322
Adjustment of limit value (model SMO-1..., SMW-1...)
 Loosen the safety screws on contact-foot.
 Set the adjustment notch on contact-foot at the desired value on the scale
mounted on the housing.
 In this position, tighten the safety screws.
Hysteresis
Hysteresis indicates the difference between switch-on and switch-off points of
contacts. Through factory set coordination of magnet and contact force (AW-
number) a float upstroke (hysteresis) of approx. 3-5 mm is achieved. At the same
time, it is ensured that the contact operates in a bistable manner.
Measuring range transgressions
Attention! Pulsating flow currents should be avoided. Overstepping
of measuring range continuously by pulsating flow currents and
subsequently resulting impacts on float‘s limit pin may lead to
increased wear and tear as well as damage to the unit. In such
cases, please consult your supplier.
With continuous flow, if the measuring range is substantially over-ranged, an
increase in pressure loss is noticed.
(Permissible max. operational pressure must not be exceeded)
9. Maintenance
For measured media without contamination, the instrument is almost
maintenance-free. Where contamination or calcium or other deposits are found
on the internal parts, the instrument should be cleaned regularly.
The instrument may be dismantled from the piping with the help of a suitable
spanner. The internal parts are accessible for cleaning after removing the upper
connection joint.
The internal parts may be cleaned with a suitable brush. After cleaning, the
instrument should be reassembled in the correct order.
We recommend changing the O-rings of the connection joints after cleaning.
Attention! Make sure before beginning the maintenance that the
supply wires are de-energized.

SMO/SMW
SMO/SMW K13/0322 Page 9
10. Technical Information
Housing/Connections/Float: SMx-x1..:Brass, Ms 58
SMx-x2..:St. Steel,1.4301
Slotted nozzle: SMx-x1..:Brass, Ms 58
SMx-x1..:St. Steel, 1.3955
Sealings: SMx-x1..:NBR
SMx-x2..:FPM
Max. temperature: 100 °C
Max. operating pressure: SMx-x1..:250 bar
SMx-x2..:350 bar
Mounting position SMW: horizontal
SMO: vertical, flow from top
Accuracy: ± 5 % of f.s.
Reproducibility 1 %
Contacts: for SMW-1..., SMW-3..., SMO-1 and SMO-3...
Electrical connection: Plug DIN EN 175301-803
Electrical switching specifications:
N/O contact (standard) max. 250 VAC/DC / 1,5 A / 100 W / 100 VA
Changeover contact (standard) max. 250 VAC/DC / 1A / 30 W / 60 VA
N/O contact and
changeover contact (cCSAus) 230 VDC / 0,26 A / 60 W,
60 VDC / 1 A / 60 W,
max. 240 VAC / 0,42 A / 100 W,
100 VAC / 1 A / 100 W
Protection: IP 65 (electrical contact)
IP 54 (side indication)
Average electrical switch contact life (MTTF):
At max. electrical load 105 switching cycles
At half electrical load (<10% max. load) 5*107 switching cycles
At low electrical load (<10V/<1mA) 108 switching cycles

SMO/SMW
Page 10 SMO/SMW K13/0322
11. Order Codes
Flow switches with 1 contact, flow from top model: SMO-1…
(Example: SMO-1101H R0 R08)
Measuring
range l/min.
water
Pressure
loss
Δ P (bar)
Brass Stainless steel Contact Connection
0.2...3 0.2 SMO-1101H... SMO-1201H.. …R0…= 1 N/O contact
…U0…= 1 Changeover contact
…C0…= 1 N/O contact (cCSAus)
…D0… = 1 Changeover contact
(cCSAus)
…RR…= 2 N/O contact
…UU…= 2 Changeover contact
…CC…= 2 N/O contact (cCSAus)
…DD…= 2 changeover contact
(cCSAus)
..R08 = G 1/4
..R15 = G 1/2
..N08 = 1/4 NPT
..N15 = 1/2 NPT
1…4.5 0.2 SMO-1103H... SMO-1203H...
1…7.5 0.3 SMO-1105H... SMO-1205H...
1…14 0.4 SMO-1107H... SMO-1207H...
2…18 0.2 SMO-1109H... SMO-1209H...
7…25 0.4 SMO-1111H... SMO-1211H...
10…60 0.7 SMO-1113H... SMO-1213H... ..R15 = G 1/2 ..N15 = 1/2 NPT
10…80 0.5 SMO-1115H... SMO-1215H... ..R20 = G 3/4
..R25 = G 1 ..N20 = 3/4 NPT
10…120 0.5 SMO-1117H... SMO-1217H...
Flow meter, flow from top model: SMO-2…
(Example: SMO-2107H 00R08)
Measuring
range l/min.
water
Pressure
Loss
Δ P (bar)
Brass Stainless steel Contact Connection
0.2...3 0.2 SMO-2101H... SMO-2201H..
...00… = without contact
..R08 = G 1/4
..R15 = G 1/2
..N08 = 1/4 NPT
..N15 = 1/2 NPT
1…4.5 0.2 SMO-2103H... SMO-2203H...
1…7.5 0.3 SMO-2105H... SMO-2205H...
1…14 0.4 SMO-2107H... SMO-2207H...
2…18 0.2 SMO-2109H... SMO-2209H...
7…25 0.4 SMO-2111H... SMO-2211H...
10…60 0.7 SMO-2113H... SMO-2213H... ..R15 = G 1/2 ..N15 = 1/2 NPT
10…80 0.5 SMO-2115H... SMO-2215H... ..R20 = G 3/4
..R25 = G 1
..N20 = 3/4 NPT
..N25 = 1 NPT
10…120 0.5 SMO-2117H... SMO-2217H...
Flow meters and switches with 1 contact, flow from top model: SMO-3…
(Example: SMO-3101H R0 R08)
Measuring
range l/min.
water
Pressure
loss
Δ P (bar)
Brass Stainless
Steel
Contact Connection
0.2...3 0.2 SMO-3101H... SMO-3201H.. …R0…= 1 N/O contact
…U0…= 1 Changeover contact
…C0…= 1 N/O contact (cCSAus)
…D0… = 1 Changeover contact
(cCSAus)
…RR…= 2 N/O contact
…UU…= 2 Changeover contact
…CC…= 2 N/O contact (cCSAus)
…DD…= 2 changeover contact
(cCSAus)
..R08 = G 1/4
..R15 = G 1/2
..N08 = 1/4 NPT
..N15 = 1/2 NPT
1…4.5 0.2 SMO-3103H... SMO-3203H...
1…7.5 0.3 SMO-3105H... SMO-3205H...
1…14 0.4 SMO-3107H... SMO-3207H...
2…18 0.2 SMO-3109H... SMO-3209H...
7…25 0.4 SMO-3111H... SMO-3211H...
10…60 0.7 SMO-3113H... SMO-3213H... ..R15 = G 1/2 ..N15 = 1/2 NPT
10…80 0.5 SMO-3115H... SMO-3215H... ..R20 = G 3/4
..R25 = G 1
..N20 = 3/4 NPT
..N25 = 1 NPT
10…120 0.5 SMO-3117H... SMO-3217H...

SMO/SMW
SMO/SMW K13/0322 Page 11
Flow switches with 1 contact, horizontal flow model: SMW-1…
(Example: SMW-1101H LR0 R08)
Measuring
range
l/min.
water
Pressure
loss
Δ P (bar)
Brass Stainless
Steel
Direction
of flow Contact Connection
0.5…3.5 0.2 SMW-1101H… SMW-1201H…
..L = from left
..R = from right
…R0…= 1 N/O contact
…U0…= 1 Changeover contact
…C0…= 1 N/O contact (cCSAus)
…D0…= 1 Changeover contact
(cCSAus)
…RR…= 2 N/O contact
…UU…= 2 Changeover contact
…CC…= 2 N/O contact (cCSAus)
…DD…= 2 changeover contact
(cCSAus)
..R08= G 1/4
..R15= G 1/2
..N08= 1/4 NPT
..N15= 1/2 NPT
2…9 0.4 SMW-1103H… SMW-1203H…
2.5…15 0.5 SMW-1105H… SMW-1205H…
3.5…24 0.3 SMW-1107H… SMW-1207H…
10…60 0.7 SMW-1109H… SMW-1209H… ..R15= G 1/2 ..N15= 1/2 NPT
5…90 0.6 SMW-1111H… SMW-1211H…
..R20= G 3/4
..R25= G 1
..N20= 3/4 NPT
..N25= 1 NPT
10…120 0.6 SMW-1113H… SMW-1213H…
Flow meter, horizontal flow model: SMW-2…
(Example: SMW-2101H L00 R08)
Measuring
range l/min.
water
Pressure
loss
Δ P (bar)
Brass Stainless
Steel
Direction
of flow Contact Connection
0.5…3.5 0.2 SM
W
-2101H… SM
W
-2201H…
..L = from left
..R = from right
…00…= without contact
..R08= G 1/4
..R15= G 1/2
..N08= 1/4 NPT
..N15= 1/2 NPT
2…9 0.4 SM
W
-2103H… SM
W
-2203H…
2.5…15 0.5 SM
W
-2105H… SM
W
-2205H…
3.5…24 0.3 SM
W
-2107H… SM
W
-2207H…
10…60 0.7 SM
W
-2109H… SM
W
-2209H… ..R15= G 1/2 ..N15= 1/2 NPT
5…90 0.6 SM
W
-2111H… SM
W
-2211H… ..R20= G 3/4
..R25= G 1
..N20= 3/4 NPT
..N25= 1 NPT
10…120 0.6 SM
W
-2113H… SM
W
-2213H…
Flow meters and switches with 1 contact, horizontal flow model: SMW-3…
(Example: SMW-3101H RR0 R08)
Measuring
range
l/min.
water
Pressure
loss
Δ P (bar)
Brass Stainless
Steel
Direction
of flow Contact Connection
0.5…3.5 0.2 SM
W
-3101H… SM
W
-3201H…
..L = from
left
..R = from
right
…R0…= 1 N/O contact
…U0…= 1 Changeover contact
…C0…= 1 N/O contact (cCSAus)
…D0…= 1 Changeover contact (cCSAus)
…RR…= 2 N/O contact
…UU…= 2 Changeover contact
…CC…= 2 N/O contact (cCSAus)
…DD…= 2 changeover contact (cCSAus)
..R08= G 1/4
..R15= G 1/2
..N08= 1/4 NPT
..N15= 1/2 NPT
2…9 0.4 SM
W
-3103H… SM
W
-3203H…
2.5…15 0.5 SM
W
-3105H… SM
W
-3205H…
3.5…24 0.3 SM
W
-3107H… SM
W
-3207H…
10…60 0.7 SM
W
-3109H… SM
W
-3209H… ..R15= G 1/2 ..N15= 1/2 NPT
5…90 0.6 SM
W
-3111H… SM
W
-3211H… ..R20= G 3/4
..R25= G 1
..N20= 3/4 NPT
..N25= 1 NPT
10…120 0.6 SMW-3113H… SMW-3213H…

SMO/SMW
Page 12 SMO/SMW K13/0322
12. Dimensions
Model 4-side
(mm) Thread G L (mm)
Weight
(kg)
SMx-..01 30x30 1/4 (1/2) 132 (136) 1
SMx-..03 30x30 1/4 (1/2) 132 (136) 1
SMx-..05 30x30 1/4 (1/2) 132 (136) 1
SMx-..07 30x30 1/4 (1/2) 132 (136) 1
SMO-..09 30x30 1/4 (1/2) 132 (136) 1
SMW-..09 30x30 1/2 150 1
SMO-..11 30x30 1/4 (1/2) 156 (150) 1.7
SMW-..11 40x40 3/4 (1) 156 (150) 1.7
SMO-..13 30x30 1/2 150 1
SMW-..13 40x40 3/4 (1) 156 (150) 1.7
SMO-..15 40x40 3/4(1) 156 (150) 1.7
SMO-..17 40x40 3/4 (1) 156 (150) 1.7

SMO/SMW
SMO/SMW K13/0322 Page 13
13. Recommended Parts
Only the parts of the instruments and the materials are listed.
Depending on the instrument model, these parts are available in different sizes.
(When ordering please mention the instrument type.)
1.1) Float (Brass) 5.1) N/O Contact (standard)
1.2) Float (Stainless Steel) 5.2) Changeover Contact (standard)
2.1) Slotted nozzle (Brass) 5.4) N/O Contact (cCSAus)
2.2) Slotted nozzle (Stainless Steel) 5.5) Changeover Contact (cCSAus)
3.1) Spring (Stainless Steel)
4.1) O-ring set (NBR)
4.2) O-ring set (FPM)

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Page 14 SMO/SMW K13/0322
14. EU Declaration of Conformance (SMO/SMW)
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Flow Meter / Monitor Model: SMO-..., SMW-...
to which this declaration relates is in conformity with the standards noted below:
EN 61010-1:2011 Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 1: General requirements
EN 60529:2014 Degrees of protection provided by enclosures (IP
Code)
EN 60079-0:2014 Explosive atmospheres - Part 0: Equipment -
General requirements
EN 60079-18:2010 Explosive atmospheres - Part 18: Equipment protection by
encapsulation "m"
EN IEC 63000:2018 Technical documentation for the assessment of electrical
and electronic products with respect to the restriction of hazardous substances.
Also, the following EC guidelines are fulfilled:
2014/35/EU Low Voltage Directive
2011/65/EU RoHS (category 9)
2015/863/EU Delegated Directive (RoHS III)
Hofheim, 1 June 2021
H. Volz M. Wenzel
General Manager Proxy Holder

SMO/SMW
SMO/SMW K13/0322 Page 15
15. UK Declaration of Conformity (SMO/SMW)
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Flow Meter / Monitor Model: SMO-..., SMW-...
to which this declaration relates is in conformity with the standards noted below:
BS EN 61010-1:2010+A1:2019
Safety requirements for electrical equipment for measurement, control, and
laboratory use. General requirements
BS EN 60529:1992+A2:2013
Degrees of protection provided by enclosures (IP Code)
BS EN IEC 63000:2018
Technical documentation for the assessment of electrical and electronic products
with respect to the restriction of hazardous substances.
Also, the following UK guidelines are fulfilled:
S.I. 2016/1101 Electrical Equipment (Safety) Regulations 2016
S.I. 2012/3032 The Restriction of the Use of Certain Hazardous
Substances in Electrical and Electronic Equipment
Regulations 2012
Hofheim, 1 June 2021
H. Volz M. Wenzel
General Manager Proxy Holder