Kobold NVI Manuale utente

Operating Instructions

for

Vibrating Level Switches

Model: NVI

NVI

page 2 NVI K04/0517

1.Contents

1.Contents........................................................................................................2

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

3.Instrument Inspection....................................................................................3

4.Regulation Use..............................................................................................3

5.Operating Principle........................................................................................4

6.Mechanical Connection.................................................................................4

7.Electrical Connection ....................................................................................7

7.1General................................................................................................7

7.2Operation Diagram ..............................................................................7

8.Commissioning..............................................................................................8

8.1Density (Sensitivity) Adjustment (Switch A).........................................8

8.2High/Low Fail-Safe Mode (Switch C)...................................................8

8.3Time Delay (Switch B) .........................................................................8

9.Technical Information....................................................................................9

10.Derating Diagram........................................................................................10

11.Order Codes ...............................................................................................10

12.Maintenance ...............................................................................................10

13.Storage .......................................................................................................11

14.Guarantee...................................................................................................11

15.Dimensions .................................................................................................11

16.EU Declaration of Conformance..................................................................12

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

NVI

NVI K04/0517 page 3

2.Note

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.

When used in machines, the measuring unit should be used only when the

machines fulfil the EC-machine guidelines.

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:

Vibrating Level Switch model NVI

Operating Instructions

4.Regulation Use

Any use of the Vibrating Level Switch, model: NVI, which exceeds the

manufacturers specification may invalidate its warranty. Therefore any resulting

damage is not the responsibility of the manufacturer. The user assumes all risk

for such usage.

NVI

page 4 NVI K04/0517

5.Operating Principle

The KOBOLD NVI level switch is a mechanical system that is made to resonate

by an electronic switching operation. When the probe is covered by a medium,

the vibrations are damped. This change in the resonance frequency is converted

to a switching signal by electronic means.

The combined vibrating switch can be used in powdery media and granular

materials. The medium to be measured should have a density of at least 0.05

kg/dm3. The single rod design prevents deposit formation. The rod is self-

cleaning, as the vibrations shake off the medium.

6.Mechanical Connection

Important! Handle the device with great care, especially the sensing

probe. A larger impact on the sensing probe may ruin its resonance

system. Probes exposed to falling material or mechanical loads

should be protected.

Prior to the installation, it is advised to test the switching function of the unit on

a sample quantity of material and to set „Density“ switch according to the

density of medium. (see 8. Commissioning)

Screw in the device by its hexagon neck. After screwing tight the process

connection, the housing can be rotated (max. 300 °), to adjust the cable glands

to the required position. In some cases such as material caving or arching you

will need to mount the vibration rod at a clearance from the desired limit.

The model NVI is not suggested to be used for low level detection in high

density materials.

Max. switching Min. switching

NVI

NVI K04/0517 page 5

Limits for bending or pulling force and torque should be considered:

R_H

R_R

R_L

R_K

R_C

F = 500 N

M = 100 Nm M = 100 Nm F = 45 kN

Powder Granulate

NVI

page 6 NVI K04/0517

Probes exposed to falling material or mechanical loads should be protected.

L30x30x3

When working with powdery bulk materials you should install the device at an

inclination greater than the existing angle of repose, or even vertically to detect

maximum level. This is necessary in order to prevent too much powder clinging

to the vibration rod and hindering vibration and self-cleaning of the rod when

the silo/tank is being emptied. Avoid mounting the device as shown in the

diagram.

Use rubber shims for example to protect the device in bins/silos where large

vibrations occur.

NVI

NVI K04/0517 page 7

7.Electrical Connection

7.1 General

Attention! Check that the electrical power supply to the instrument

complies with the operating data for the instrument.

AC = Switch rating acc. To EN60947-1

NO CNC

NL1

123 456

250VAC

8A/AC1

B CStatus LED

Relay output version

Attention! Incorrect wiring will lead to damage of the unit’s

electronics.

7.2 Operation Diagram

Power Probe Fail-safe mode LED RELAY

NOT

VIBRITING

(COVERED)

LOW GREEN

ENERGISED

HIGH RED

DE-ENEGISED

VIBRITING

(FREE)

LOW RED

DE-ENEGISED

HIGH GREEN

ENERGISED

FAILS LOW

HIGH NOT LIT

DE-ENEGISED

NVI

page 8 NVI K04/0517

8.Commissioning

Unscrew the housing cover to access the terminals and setting switches. Do not

disconnect the wire from terminal connection point 1. Ground the device at

terminal PE or use the grounding screw on the device.

When you have properly connected the device, it is ready for operation. The LED

lights up when the device is switched on.

8.1 Density (Sensitivity) Adjustment (Switch A)

The DIP-Switch DENSITY (switch A) needs to be set to suit the material density.

LOW position, recommended for loose and light materials with density around

and below 0.1 kg/dm³ represents low energy and amplitude of vibration as

well as great sensitivity of detection.

HIGH position, recommended for (thick and heavy) materials with density over

0.1 kg/dm³ represents vibration with high energy and amplitude and small

sensitivity of detection.

8.2 High/Low Fail-Safe Mode (Switch C)

De-energised status of the relay is preferred to be used for fail-safe alarm, thus a

power breakdown will be considered as alarm (see 7.2 Operation Diagram)

8.3 Time Delay (Switch B)

Though the density of the medium is within the specific range, the device may not

detect if the internal friction of the medium is too low. Choose a switch delay

(switch B) to suit process requirements (standard response time, switch delay

= 5 s; short response time, switch delay = 2 s).

Note: The device can be damaged by electrostatic discharge

(e.s.d.) from the DIP switch. To prevent such damage, the

general precautions must be strictly observed.

NVI

NVI K04/0517 page 9

9.Technical Information

Probe length: 207 mm (standard)

pipe extended version: up to 3 m

cable extended version, PE coated:

up to 20 m

Process connection: G 1 1/2 or 1 ½” NPT

Housing material: aluminium, powder coated

Material for

wetted parts: 1.4571 (AISI316Ti) for vibrating probe

PE cover for cable

Sensor surface: bright

Medium temperature: -30 °C...+110 °C standard probe

-30 °C...+80 °C (NVI-5)

-30 °C...+160 °C high temperature

Ambient temperature: -30 °C...+60 °C

Maximum pressure: 25 bar (NVI-1/2/3/4)

6 bar (NVI-5)

Minimum density

of medium: 0.05 kg/l

Max. grain size: 10 mm

Max load:

Version Standard Pipe extended Cable extended

High limit switch Side mounted Top mounted Top mounted

Low limit switch Side or bottom

mounted

Loadability

Force 500 N - 45 kN

Torque 100 N 100 Nm -

Switching delay

(selectable): 1.8 s or 5 ± 1.5 s

(selectable) with covered rod

2 s or 5 ± 1.5 s

rod swings freely

Output: changeover contact 250 VAC /8 A

Power supply: 20...255 VAC/DC; ≤2.5 VA/2 W

Electrical connection: 2xM20x1.5

Protection: IP 67

Weight: approx. 1.9 kg (NVI-1/2)

approx. 3.3 kg (NVI-3/4)

approx. 2.5 kg (NVI-5)

NVI

page 10 NVI K04/0517

10. Derating Diagram

-30

-30 50 75

100 110 160 T

[°C]

Ambient temperature (TA) versus medium temperature (TM)

11. Order Codes

Example: NVI-1 305 R

Model Version Power supply Connection

NVI-

1 = standard probe

2 = standard probe,

high-temperature 305 = 20...255 VAC/DC R = G 1 ½

N = 1 ½” NPT

3* = pipe extended

4* = pipe extended,

high temperature

5* = cable extended

* Mention desired length in clear text (in mm).

12. Maintenance

Series NVI devices require no regular maintenance. You may need to remove

product stuck to the vibrating section and clean the vibrating section every now

and then. Handle the vibrating section of the vibration rod with great care to

avoid any damage.

The manufacturer will carry out all repairs within and beyond the guarantee

period. Clean or disinfect all parts before returning them for repair.

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