Kobold NCW Series, NCW-N, NCW-T, NCW-H, NCW-S Operating Instructions Manual

Operating instructions

for

Capacitive Level Monitor

NCW

NCW

1. Content

1. Content ......................................................................................................... 2

2. Note .............................................................................................................. 3

3. Instruments Inspection .................................................................................. 3

4. Description .................................................................................................... 3

5. Regulation Use .............................................................................................. 3

6. Operating principle ........................................................................................ 4

7. Mechanical connection .................................................................................. 4

8. Electrical connection ..................................................................................... 5 

9. Adjustment .................................................................................................... 6

10.Models .......................................................................................................... 9

11.Technical Data ............................................................................................ 10

12.EU Declaration of conformance .................................................................. 11

13.Notes ........................................................................................................... 12

Manufactured by:

9.1 Module replacement ............................................................................ 8

Kobold Mesura S.L.U

Avda Conflent Nº68 Nave 15

08915 Badalona
Tel.: [phone]
Fax: [phone]

E-Mail: [e-mail]

Internet: www.kobold.com

Edition: May 2017

Page 2 DT0453

NCW

2. Note

Please read these operating instructions before unpacking and putting the unit in
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. Instruments Inspection

Instruments are inspected before shipping and sent out in perfect condition.
Scope of delivery
The standard delivery includes:

 Capacitive Level Monitor NCW
 Cable gland M20
 Operating Instructions

4. Description

All NCW level switch instruments can be used in any application where one level of
liquid in a tank or a silo must be detected

5. Regulation Use

The capacitive Level Monitor is indicated to punctual level detection in tanks
containing liquids.

The are 4 basic models:

NCW-N: Rigid probe in PTFE, for general applications in metallic tanks.
NCW-T: Rigid probe in PTFE with stainless steel tube (ground tube). For products

with a low dielectrical constant and non metallic tanks.

NCW-H: Rigid probe in PTFE with special thread made of stainless steel for high
Temperatures (125ºC)

NCW-S: Double rigid probe in PVDF for NON METALLIC tanks containing
aggressive liquids that attack stainless steel.

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NCW

6. Operating principle

The NCW sensor together with the wall of the tank is a capacitor.
The dielectric constant of this capacitor is the air when the product (media) doesn’t
reach the sensor. When the product covers the sensor, the dielectric constant is the
product one. The electronic circuit of the NCW detects this change and activates an
output relay.

7. Mechanical connection

Before installation:

 Remove all packing materials and transport retainers and ensure that no

such materials remain in the device.

 Make sure that the permitted max. operational pressure and temperature

limits are not exceeded (see Technical Information)

 Protect the measuring sensor from external damage.
 The units may not be installed at a location within an inductive field.
 If possible, check directly after mechanical installation whether the

connection thread to the pipe is fully sealed.

Installation:
The NCW is installed using a 1”BSP, (2”BSP Thread in NCW-S version)
Check if probe’s length is correct to detect the level. At the end of the probe there
is a stopper to guaranty the electrode waterlight.
This part (10mm aprox.) is not sensible to the liquid.

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NCW

8. Electrical connection

DT0453 Page 5