Kobold NMC User manual

Operating instructions
for
Capacitive level transmitter
Model NMC
2 Wire (4 to 20mA)

NMC
Page 2 DT0305
1. Content
1. Content ....................................................................................................................... 2
2. Note ............................................................................................................................ 3
3. Instrument inspection .................................................................................................. 3
4. Description .................................................................................................................. 3
5. Application .................................................................................................................. 4
6. Current simulation ....................................................................................................... 4
7. Installation .................................................................................................................. 5
8. Electrical connection ................................................................................................... 6
9. Programming .............................................................................................................. 7
9.1 Calibrating probe .................................................................................................. 7
9.2 Output Adjustment ................................................................................................ 8
9.3 Output simulate .................................................................................................... 9
9.4 Language ........................................................................................................... 10
10. Technical Data ....................................................................................................... 11
10.1 Process temperature range ............................................................................ 12
10.2 Process pressure range .................................................................................. 12
11. Safety Instructions (ATEX) .................................................................................... 13
11.1 Validity ................................................................................................................ 13
11.2 General considerations ...................................................................................... 13
11.3 Protection against ESD (electrostatic discharges) ............................................. 13
11.4 Chemical resistance ........................................................................................... 13
12. Installation in classified zone (ATEX) ..................................................................... 14
13. Label Description (ATEX) ...................................................................................... 14
14. Declaration of conformity ATEX ............................................................................. 15
15. UE Declaration of Conformity ................................................................................ 16
16. UK Declaration of Conformity ................................................................................ 17
17. ATEX Certified ....................................................................................................... 18
18. Models ................................................................................................................... 23
19. Order details. ......................................................................................................... 24
Manufactured by:
Kobold Mesura S.L.U
Avda Conflent Nº68 Nave 15
08915 Badalona
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com
Edition: May 2022

NMC
DT0305 Page 3
2. Note
Please read these operating instructions before unpacking and putting the unit in
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 correspond 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.
Please read these operating instructions before unpacking and putting the unit into
operation. Follow the instructions precisely as described herein.
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.
3. Instrument inspection
Instruments are inspected before shipping and sent out in perfect condition.
Scope of delivery
The standard delivery includes:
 Capacitive Level Transmitter NMC
 Cable gland M20
 Operating Instructions
4. Description
The NMC transmitter is a two-wire capacitance level transmitter for measuring
continuous level in tanks containing liquids.

NMC
Page 4 DT0305
5. Application
The probe of the NMC and the wall of the tank, forms an electric capacitor. The
dielectric of this capacitor when the tanks is empty, is the air.
When the liquid reaches the probe, the dielectric constant formed by the unit and
tank, changes.
An electronic circuit sited in the connecting module of NMC, converts this capacity
change in a variable current and proportional to the height of the liquid.
Due to each application is different, given that the kind and the measures of the tank
and the products that it contains change, every unit must to be adjusted to be adapted
to each tank and product.
Using the menus of the NMC, this operation is very easy.
The circuit, controlled by microprocessor, stores all data and does the calculation. A
display LCD guides us in the calibration process.
The output current signal is 4 to 20 mA. These values can be sited where we want in
the probe.
6. Current simulation
Using this option, the NMC generates in the supply loop, a 4 to 20 mA current, in
steps of 1 mA. This function is very useful to make tests with independence of the
level of the tank.

NMC
DT0305 Page 5
7. Installation
The NMC is installed using a G1” (G2” in DS version).
The probe must be installed avoiding a good contact between the probe and the
tank’s wall.
Electronic of the NMC unit should be protected with shelter against development of
too high temperature by direct sunshine.
Be ensured that the connection to the tank has been done properly. The NMC ’s
thread should not be forced.
The electrical connection between the thread and the tank must to be good.

NMC
Page 6 DT0305
8. Electrical connection
The maximum resistance of the line in serial, depends on the power supply. These
values have to be bear in mind for the good run of the NMC.

NMC
DT0305 Page 7
9. Programming
9.1 Calibrating probe
Pressing any key, you enter in the main menu.
Press (OK) to enter in calibration probe.
To avoid mistakes, asks again if you are sure that,
you want to calibrate the unit. Press (OK) another
time to enter.
If the level in the tank is low, we will choose the (OK)
option to adjust the unit with the lowest level.
If, for example, when you adjust the low level, the level
of the tank is the 0 % of the capacitance, we will
indicate it in the display using the (+) and (-) keys.
Confirm with (OK).
In this moment the microprocessor makes the
operations to choose the best measurement range.
This operations takes some seconds.
When this operation is finished, the display shows the
message “PROBE CALIBRATED”.
Automatically the display show the main menu.
Now need calibrate the High Level, then pressing (OK)
another time to enter in the calibration probe menu.

NMC
Page 8 DT0305
To avoid mistakes, asks again if you are sure that you
want to calibrate the unit. Press (OK) another time to
enter.
Pressing (+) we enter in High level calibration.
If when you adjust the high level, the liquid in the tank is
100 % of the capacitance, we will indicate it in the
display using the (+) and (-) keys. Confirm with (OK).
The microprocessor makes the operations to calibrate
the maximum level of the unit. This operation takes
some seconds.
The display shows this message to indicate NMC has
finished the calibration internal process.
When the liquid level will be in the minimum point, it will
indicate 000.0 % and when the liquid level will be in the
maximum, 100.0 %.
Automatically, the display shows the main menu.
Pressing ESC the unit return to read state.
Pressing (+) we can enter in output adjustment.
menu and simulation mode.
9.2 Output Adjustment
Pressing any key, you enter in the main menu.
Press (+) to enter in Output.

NMC
DT0305 Page 9
Pressing (+), we enter in Output adjustment menu.
This asks, where do you want the NMC gives us mA. If
you want it in 0 % of the probe. Using (+) and (-) we
indicate this value in the display. Confirm with (OK)
We do the same for the 20 mA. In this case, if we want
this current in the 100 % of the probe, we will indicate
this value using (+) and (-). Confirm with (OK)
Finished the adjustment, we can incorporate a filter to
avoid oscillations caused by quick movements of the
liquid’s surface. This value between 0 and 5 (maximum
filter). Confirm with (OK)
Automatically return to output menu.
Pressing ESC return to measuring mode.
In this point, the NMC is adjusted. The number in %
indicates the height that reaches the level in the probe
(0 to 100). The value of the current will depend of the
adjustment of the points 3 and 4 of this section, and it
can be in any point of the probe. It can be in maximum
point and in the 20 mA at the minimum.
9.3 Output simulate
Pressing any key, you enter in the main menu.
Press (+) to enter in Output.

NMC
Page 10 DT0305
Pressing (-), we enter in simulate output menu.
In this screen, using the (+) and (-) keys, the loop
current (2 wire) will change in steps of 1mA. With this
option, you can do current testes without generator.
Pressing (OK) return to menu show in point 2.
Pressing (ESC) return to read mode.
9.4 Language
Pressing any key, you enter in the main menu.
Press (+) to enter in Output.
Pressing (+) or (-) we can choose the language for the
display.
Language available: Spanish, English, German, Italian,
French, Portuguese, Catalan.
Pressing (OK) return to main menu in language
selected.

NMC
DT0305 Page 11
10. Technical Data
Note: Kobold Mesura makes every attempt to ensure the accuracy of these
specifications but reserves the right to change them at any time.
Measuring principle: Capacitive (for liquids up to 1000 pF)
Probe length: 265…4000 mm (shorter versions on request)
Accuracy: ±2 mm
Medium temp.: standard -20…+ 90 ºC, NMC-H -20…+200 ºC
Max. pressure.: -1…30 bar
Media DC-value: ε
r
= min. 1.5
Materials: Housing: Polycarbonate
Connection: St.steel 1.4305 (NMC-N,NMC-T,NMC-H)
PVDF (NMC-S)
Probe: - St.steel with PTFE coating (NMC-N, NMC-T)
- PVDF coating (NMC-S)
Mech. connection: G1 male (NMC-N, NMC-H, NMC-T)
G2 male (NMC-S)
Supply voltage: 10…35 Vdc
12…30 Vdc for ATEX
Electr. connection: 1 x cable gland M20
Output: 4-20mA, two-wire
Protection: IP 65
ATEX Ex II 2/1 GD Ex ia IIC T4 Gb/Ga
Ex ia IIIC T85ºC Db/Da
20ºC<Ta<+60ºC

NMC
Page 12 DT0305
10.1 Process temperature range
10.2 Process pressure range
‐20
20
60
100
‐20 0 +20 +60 +90 +200
AMBIENTTEMPERATURE
PROCESSTEMPERATURE
ModelH Modelstandard
0
5
10
15
20
25
30
35
‐20 0 +20 +60 +90 +200
PROCESSPRESSUREBAR
PROCESSTEMPERATURE
ModelH Modelstandard
-1

NMC
DT0305 Page 13
11. Safety Instructions (ATEX)
11.1 Validity
These safety instructions must be applied to the capacitive level transmitters series
NMC...E when used in explosive atmospheres.
11.2 General considerations
Working principle of NMC..E is capacitive and these instruments are used to
measure and control the level on a liquid of any zone. Including zones with
explosion risk.
Level instruments NMC..E have an analogue output 4-20 mA two wires, and are
used to measure the level in a tank. They can be used in explosive atmospheres
group IIA, category 1/2GD
NMC..E have a housing with the electronic module and a probe that can be rigid
(one or two roads) or flexible.
The probe can be installed in explosion risk areas 1/2GD.
The process connection element and the housing must be installed in area 2GD.
When installing these instruments in explosive zones, all general instructions and
recommendations regarding installations in explosive zones, as well as the
instructions of this safety manual must be followed.
Verify that all data in the label of the instrument fits the installation requirements.
EN60079-0, EN60079-11, EN60079-26, EN60079-31 must be followed.
Switch off power supply before open housing or be sure there is no explosion risk.
Verify that housing is closed before switch on the instrument.
It is very important to verify that ground terminal of the instrument is connected to
ground of the installation.
Installation in hazardous zones must be done by trained people.
11.3 Protection against ESD (electrostatic discharges)
Instruments with plastic parts that can produce electrostatic discharges, have a
label for it.
It is important to follow some rules to avoid ESD:
-Avoid frictions.
-Do not clean the instrument with a dry cloth.
-Do not install in locations close to pneumatic flow of materials or close to steam
exhaust systems.
11.4 Chemical resistance
Materials in touch with the instrument must be chemically resistant specially when
used in hazardous zones category 1/2GD.

NMC
Page 14 DT0305
12. Installation in classified zone (ATEX)
In classified zones, NMC EX version, must
be installed with the housing in zone 21, 22
dust and 1, 2 for Gas (category 2) or NOT
CLASSIFIED.
Process connection is mounted in the border
wall between areas of category 2 and 1.
Probe can be mounted in ZONE 20,21 or 0,1
(category 1).
Installation must be done by people trained
in ATEX environments.
13. Label Description (ATEX)

NMC
DT0305 Page 15
14. Declaration of conformity ATEX
DT0164
DECLARACIÓN DE CONFORMIDAD EU
EU DECLARATION OF CONFORMITY
EU-KONFOMITÄTSERKLÄRUNG
DÉCLARATION DE CONFORMITÉ
DICHIARAZIONE DI CONFORMITÀ EU
KOBOLD MESURA SLU
Avda. Conflent 68, nave 15 08915 Badalona (España)
Declara, bajo la propia responsabilidad, que el producto
Declares under our sole responsibility, that the product
Erklärt in alleiniger Verantwortung, dass das produkt
Déclare sous sa seule responsabilité, que le produit
Dichiara sotto la propia responsabilità, che il prodotto
NMC…E
A los cuales se refiere esta declaración, son conformes a las siguiente Directivas Europeas:
To which this declaration relates is in conformity with the following European Directives:
Mit folgenden Richtlinien konform ist:
À auxquels se réfère cette déclaration, ils sont conformes aux Directives Européennes suivant :
A ai quali si riferisce questa dichiarazione, sono conformi alle direttive europee seguente:
EMC2014/30/EU LVD2014/35/EU Atex2014/34/EU RoHS2011/65/EU
Normas armonizadas y documentos de la normativa aplicados:
Applied harmonised standards and normative documents:
Angewandte harmonisierte Normen und normative Dokumente:
Normes harmonisées et documents normatifs appliqués
Norme armonizzate e documenti normativi applicati:
EN61010-1 :2011 EN60079-0:2006 (acc. EN60079-0:2013)
EN61000-6-2 :2019 EN60079-26:2007 (acc. EN60079-26:2015)
EN60079-11:2007 (acc. EN60079-11:2013)
Certificado de examen CE de tipo
Marcado
EC-type examination certificate Marking
EG-baumusterprübescheinigung Kennzeichnung
Attestation d´examen CE de type Inscription
Certificazione per esame di tipo CE Marcatura
LOM07ATEX2032X II 2/1 GD Ex ia IIC T4 Gb/Ga
Ex ia IIIC T85ºC Db/Da
-20ºC < Ta < +60ºC
Fabricado en : KOBOLD MESURA SLU Avda. Conflent 68, nave 15 08915 BADALONA (Spain )
Made in:
Hergestellt in:
Fabriqué dans:
Fabbricato in:
Organismo notificado
: LOM 0163 Número notificación : LOM 05ATEX9070
Notified organism Number notification
Zertifizierungsstelle Zertifikatsnummer
Organization annoncée Nombre notification
Organismo informato Notifica di numero
Badalona june 2017 Gerente

NMC
Page 16 DT0305
15. UE Declaration of Conformity
DT0490
DECLARACIÓN DE CONFORMIDAD EU
EU DECLARATION OF CONFORMITY
EU-KONFOMITÄTSERKLÄRUNG
DÉCLARATION DE CONFORMITÉ
DICHIARAZIONE DI CONFORMITÀ EU
KOBOLD MESURA SLU
Avda. Conflent, 68 nave 15 08915 Badalona (España)
Declara, bajo la propia responsabilidad, que el producto
Declares under our sole responsibility, that the product
Erklärt in alleiniger Verantwortung, dass das produkt
Déclare sous sa seule responsabilité, que le produit
Dichiara sotto la propia responsabilità, che il prodotto
NMC…
A los cuales se refiere esta declaración, son conformes a las siguiente Directivas Europeas:
To which this declaration relates is in conformity with the following European Directives:
Mit folgenden Richtlinien konform ist:
À auxquels se réfère cette déclaration, ils sont conformes aux Directives Européennes suivant :
A ai quali si riferisce questa dichiarazione, sono conformi alle direttive europee seguente:
EMC2014/30/EU LVD2014/35/EU RoHS2011/65/EU
Normas armonizadas y documentos de la normativa aplicados:
Applied harmonised standards and normative documents:
Angewandte harmonisierte Normen und normative Dokumente:
Normes harmonisées et documents normatifs appliqués
Norme armonizzate e documenti normativi applicati:
EN61010-1 :2011 EN61000-6-2 :2019
Fabricado en: KOBOLD MESURA SLU Avda. Conflent, 68 nave 15 08915 BADALONA (Spain)
Made in:
Hergestellt in:
Fabriqué dans:
Fabbricato in:
Badalona June 2017 Gerente

NMC
DT0305 Page 17
16. UK Declaration of Conformity
DECLARACIÓN DE CONFORMIDAD UK
UK DECLARATION OF CONFORMITY
UK-KONFOMITÄTSERKLÄRUNG
DÉCLARATION DE CONFORMITÉ UK
DICHIARAZIONE DI CONFORMITÀ UK
KOBOLD MESURA SLU
Avda. Conflent, 68 nave 15 08915 Badalona (España)
We Kobold Mesura S.L.U. declare under our sole responsibility that the product:
Level transmitter NMC-..
To which this declaration relates is in conformity with the standards noted below:
BS EN 61010-1:2010
Safety requirements for electrical equipment for measurement,controL, and laboratory use. General
requirements
BS EN 61000-6-2:2019
Electromagnetic compatibility (EMC) -- Part 6-2: Generic standards - Immunity for industrial environments
Also, the following UK guidelines are fulfilled:
S.I. 2016/1091 Electromagnetic Compatibility Regulations 2016.
S.I. 2016/1101 Electrical Equipment (Safety) Regulations 2016.
S.I. 2012/3032 The Restiction of the Use of Certain Hazardous Substances in Electrical and
Electronic Equipment Regulations 2012.
Badalona July 2021 Gerente

NMC
Page 18 DT0305
17. ATEX Certified

NMC
DT0305 Page 19

NMC
Page 20 DT0305