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

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