Kobold NPF Manuel utilisateur
Operating Instructions
for
Level Meters with Diaphragm
for Liquids
Model: NPF
NPF
Seite 2 NPF K03/0223
1. Contents
1.Contents ............................................................................. 2
2.Note .................................................................................... 3
3.Instrument Inspection ......................................................... 3
4.Regulation Use ................................................................... 4
5.Operation Principle ............................................................. 4
6.Installation .......................................................................... 5
6.1. General ...................................................................... 5
6.2 Disassembly .............................................................. 6
7.Commissioning ................................................................... 7
7.1. General ...................................................................... 7
8.Maintenance ....................................................................... 8
8.1. Cleaning ..................................................................... 8
9.Technical Information ......................................................... 9
10.Order Codes ....................................................................... 9
11.Dimension ........................................................................... 9
12.Disposal ............................................................................ 10
13.EU Declaration of Conformance ....................................... 11
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: +49(0)6192-2990
Fax: +49(0)6192-23398
E-Mail: [email protected]
Internet: www.kobold.com
NPF
NPF K03/0223 Seite 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.
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
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 machinery directive.
as per PED 2014/68/EU
In acc. with Article 4, Paragraph (3), "Sound Engineering Practice", of the
PED 2014/68/EU no CE mark.
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:
Level Metres with Diaphragm model: NPF
NPF
Seite 4 NPF K03/0223
4. Regulation Use
Any use of the Membrane Level Monitor, model: NPF, 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.
5. Operation Principle
Due to their design and the materials used, KOBOLD level meters of model
NPF with diaphragm satisfy the tough service demands in the chemical and
petrochemical industry. They are used for level measuring of low-viscosity, non-
sticking media in open, unpressurised vessels. The specific weight of the medium
should be taken into account. The fixed annular diaphragm is quite insensitive to
vibrations. Diaphragm pressure gauges have a relatively high actuating force.
Their stainless steel construction renders the instrument resistant to aggressive
environmental conditions.
NPF
NPF K03/0223 Seite 5
6. Installation
6.1. General
The assembly has to be carried out following the corresponding general technical
regulations for pressure measuring devices (e.g. DIN 16255 or EN 837-2).
While screwing in at the connection point, the required force must
not be applied using the housing, instead only use the key areas
designated for this purpose.
The installation location of the Level Meters should be easily accessible.
To avoid display deceleration time the distance between pressure withdrawal and
pressure connection should be kept small.
Between the pressure withdrawal point and the measuring unit, a shut-off device
should be introduced which allows a renewal and null-point check of the running
system. Up to the final commissioning, the shut-off equipment should remain
closed in the measurement piping. If pressure peaks are expected, suitable
protective equipment may be considered, such as a pressure peak suppressor or
a similar device. Alternatively, pressure measuring units with damping-liquid filling
such as a glycerine manometer may be provided.
The piping up to the measuring unit should provide a vibration-free, stable
attachment; otherwise, a wall bracket should be provided
The attachment of the Level Meters is to be executed in such a way that the
admissible operating temperature does not violate min. and max. limits. In
addition, Level Meters and stop valve should be protected through sufficiently
long dimensional piping or water-bag pipes. The temperature conditions can
influence the display accuracy.
An additional liquid column may affect the gauge only if this pressure is noted on
the scale. In the unfavourable case, the result of measurement is falsified.
For sealing of measuring unit's connections, sealing disks or sealing-edge-rings
are utilised. The connection is recommended with stress-sockets or union-nuts;
with that the Level Meter can be placed in the best reading position. During
screw-in or screw-out, the force must not be exerted on the Level Meter housing,
rather applied only over the four hexagonal connection-clips.
Before attaching the gauges, the Level Meter piping should be cleaned with the
Medium to be measured or with clean compressed air. While squeezing off or
blowing through the piping or containers, the gauge may not be over-pressed. If
the expected pressure is higher, the Level Meter must be removed or locked off.
NPF
Seite 6 NPF K03/0223
6.2 Disassembly
Before disassembling the Level Meter unit, ensure the machine/equipment is
depressurised or that the Level Meter is thoroughly isolated from the system. If
possible, the measuring pipe should be emptied. In case of diaphragm type
manometers, upper and lower flanges should not be loosened. Hydraulic liquid
inside disassembled measuring unit can be dangerous for the environment, in
which case corresponding safety precautions should be used. Pressure-
measuring units, whose measuring elements are filled with water or water-based
chemicals, must be protected from freezing.
NPF
NPF K03/0223 Seite 7
7. Commissioning
7.1. General
Pressure should be applied to the gauge slowly, in order to avoid damage to the
measuring unit. Thereby the unit must be monitored continuously. The maximum
permitted pressure must not be exceeded.
After commissioning of the unit, all piping connected to the measurement unit
must be checked for proper sealing. Moreover, if present, the shut-off valve for
the system pressure at the pressure-intake point must be closed.
If the pointer moves towards the zero-point direction (possible temperature
changes, condensation, to be considered), a leakage exists.
Please search for the leakage and eliminate it with appropriate actions. After that
an overall check must be repeated. For the zero point testing during operation the
blocking device must be closed and the measuring unit must be pressure
released.
The pointer must then stand within the tolerated area of the zero point on the
scale. If it is located outside this area, one can generally talk about a damage of
the measuring device. The pressure gauge should then be thoroughly inspected
in order to avoid any measuring failures or resulting accidents.
For display testing during operation, the pressure measuring device must be
closed off by a blocking device and then exposed to some testing pressure via
the testing connection.
Indicating pressure gauges generally work completely without any maintenance.
Attention! With dangerous materials, such as Oxygen, Acetylene,
flammable or poisonous materials, as well as chillers, compressors
etc. all the general regulations, along with the existing relevant
regulatory directions must be observed.
NPF
Seite 8 NPF K03/0223
8. Maintenance
If the medium to be measured is not contaminated, the unit is maintenance-free.
An examination of the display and the switching function should take place about
1 to 2 times per year. In order to check the display and switching function, the
device is to be separated from the process and be subjected with a test pressure
with appropriate inspection temperature.
8.1. Cleaning
Clean the devices with a dry or soap-water solution dampened cloth.
NPF
NPF K03/0223 Seite 9
9. Technical Information
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
10. Order Codes
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
11. Dimension
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
NPF
Seite 10 NPF K03/0223
12. Disposal
Note!
Avoid environmental damage caused by media-contaminated parts
Dispose of the device and packaging in an environmentally friendly
manner
Comply with applicable national and international disposal regulations and
environmental regulations.
Batteries
Batteries containing pollutants are marked with a sign consisting of a crossed-out
garbage can and the chemical symbol (Cd, Hg, Li or Pb) of the heavy metal that
is decisive for the classification as containing pollutants:
Cd1 Hg2 Pb3 Li4
1. „Cd" stands for cadmium
2. „Hg" stands for mercury
3. „Pb" stands for lead
4. „Li" stands for lithium
Electrical and electronic equipment
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