Kobold LFM User manual

Operating Instruction
for
Micro Flow Meter
Model: LFM

LFM
Page 2 LFM K03/0422
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 ..................................................................................... 5
8.Operation ...................................................................................................... 5
9.Technical Information .................................................................................... 6
10.Dimensions ................................................................................................... 7
11.EU Declaration of Conformance ................................................................... 8
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

LFM
LFM K03/0422 Page 3
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation and 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 with the prevailing regulation applying to
procedural safety and the prevention of accidents.
When used in machines, the measuring unit should be used only then when the
machines fulfil the EC-machine guide lines.
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:
 Micro flow meter: model LFM
 Connector plug

LFM
Page 4 LFM K03/0422
4. Regulation Use
The LFM is a new flowmeter designed for use on clean low-viscosity liquids and
is particularly suitable for dosing and filling applications. Extremely low flow rates
can be measured down to 0.005 l/min. Care should be taken that liquid which
may attack the wetted parts of the flowmeter are not used.
Please ensure that all steps in this manual are observed as the flowmeters war-
ranty does not cover damage resulting from failure to comply with these
instructions.
We recommend a filter with 40 µm mesh size.
5. Operating Principle
The measuring mechanism is based on a dual-ring piston pendulum. The right-
hand measuring chamber is opened, and the left-hand chamber closed, by the
pendulum arm that is inclined to the right. The pressure of the forced liquid acts
on the upper surface of the piston pendulum. The right-hand ring piston is
pressed clockwise downwards, and the left-hand ring piston is pressed clockwise
upwards by the larger surface (opened measuring chamber) on the right. Thus
the right-hand measuring
chamber is closed, and
the left-hand chamber
opened. The surface on
the left is now greater –
causing motion in the
opposite direction. This
cycle is repeated with
continuous flow at a rate
proportional to the flow
rate 1–230 cycles/s. A volume of approximately 0.01 cm3 is displaced per pass.
The built-in carrier frequency transducer senses the oscillating motion of the
piston pendulum and pendulum arm without contact through the case, and
outputs a digital signal with a frequency proportional to the volumetric flow. Due
to the negligible pendulum mass and minimum friction loss, the LFM detects
minimum volumetric flow rates. Leakage loss is minimized by the piston design,
which also provides good linearity and repeatability.
Inlet bore
Outlet bore
Meas. Chamber 1
Pendulum
Ring piston
Meas. Chamber 2

LFM
LFM K03/0422 Page 5
6. Mechanical connection
 Please ensure that the permitted values of maximum pressure and
temperature are not exceeded.
 The recommended filter size is 40µm.
 The flowmeter should be installed vertically with flow from bottom to top.
 Fibrous seals should be avoided as pieces can cause damage to the unit if
they enter the flowmeter. Connection should only be made using a correct fit-
ting and appropriate seal.
 We recommend that you pressure test the unit for leaks after installation.
7. Electrical connection
 When wiring the plug or making electrical connections to the flowmeter please
ensure that the power supply is isolated.
 Electrical connections should be made according to the diagram.
Attention! Incorrect wiring may cause damage to the electronics.
Check!
Plug-Connector
5-pin plug M12 SPEEDCON
1 = +UB
2 = n.c./NAMUR- (“N”, “U”)
3 = 0 V (not “N”)
4 = Signal Push-Pull (not “N”)
5 = n.c.
8. Operation
Please pay attention to the technical data printed on the type-label as well as
given in the data sheets.
The system must be evacuated from air otherwise the accuracy
will be affected.

LFM
Page 6 LFM K03/0422
9. Technical Information
Measurin
g
ran
g
e: 0.005....0.25 l/min
Linearity: 2.5 % of reading
Repeatabilit
y
: ± 0.1 %
Viscosit
y
r
an
g
e: 0.6...6 mm²/s
K facto
r
: approx. 75000 pulses/L
Material:
Sensor housing:
Pendular:
Seal:
stainless steel 1.4435
stainless steel 1.4122
PTFE, FKM, FFKM
Connection: G 1/8 female thread (output)
6 mm Swagelock (input),
NPT thread on request
Filte
r
: 40 µm; filter with 2x6 mm Swa
g
elok
Max. pressure: 100 ba
r
Max. Δp:
Max. temperature:
300 mbar at 5 cSt/0.25 L/min
-40 °C...+80 °C
Electrical data:
Electrical connection:
Push-pull
Umax= 30 V
5-pin M12
Installation position: vertical, flow rate from bottom to top
Weight
(
with transducer
)
: approx. 650
g
Protection: IP 65

LFM
LFM K03/0422 Page 7
10. Dimensions

LFM
Page 8 LFM K03/0422
11. EU Declaration of Conformance
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Micro Flow Meter Model: LFM
to which this declaration relates is in conformity with the standards noted below:
EN 61000-6-2:2005 Electromagnetic compatibility (EMC) - Part 6-2:
Generic standards - Immunity for industrial environments
EN 61000-6-4:2007+A1 Electromagnetic compatibility (EMC) - Part 6-4:
Generic standards - Emission standard for industrial environments
EN 61010-1:2015 Safety requirements for electrical equipment for
measurement, control, and laboratory use - Part 1: General requirements
Also, the following EC guidelines are fulfilled:
2014/30/EU EMC Directive
2011/65/EU RoHS (category 9)
2015/863/EU Delegated Directive (RoHS III)
Hofheim, 11 Sept. 2019
H. Peters M. Wenzel
General Manager Proxy Holder