Kobold NUS-7 Series User manual

Instruction Manual

for

Ultrasonic Level Meter

Model: NUS-7...

NUS-7

Seite 2 NUS-7 K03/0617

1.Contents

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

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

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

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

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

6.Mechanical connection..................................................................................4

6.1Block distance......................................................................................4

6.2Installation (Liquid Level Measurement) ..............................................5

6.3Installation (Open Channel Flow Measurement)..................................6

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

8.Parameters – Description and Programming ................................................8

8.1Measurement configuration .................................................................8

8.2Current Output ...................................................................................13

8.3Relay Output......................................................................................14

8.4Digital communication........................................................................15

8.4.1Measurement optimisation.......................................................15

8.532-Point linearisation .........................................................................24

8.6Informational parameters (read out parameters) ...............................25

8.7Additional parameters of the flow metering........................................26

9.Error Codes.................................................................................................27

10.Parameter Table .........................................................................................28

11.Sound Velocities in Different Gases............................................................29

12.Technical Data ............................................................................................30

13.Order Codes ...............................................................................................31

14.Dimensions [mm] ........................................................................................31

15.EU Declaration of Conformance..................................................................32

Manufactured and marketed by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: 06192-2990

Fax: 06192-23398

Internet: http: //www.kobold.com

e-mail: [email protected]

NUS-7

NUS-7 K03/0617 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 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 NUS 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:

Ultrasonic level meter model: NUS-7

Instruction Manual

4.Regulation Use

NUS-7 is a rugged, high performance ultrasonic level measurement transmitter,

having transducer and processing electronics incorporated in one single housing.

Level measurement technology based on the non-contacting ultrasonic principle is

especially suited for applications where, for any reason, no physical contact can be

established to the surface of the material to be measured.

Such reasons may include corrosive attack by the process medium against the

measuring device material (acids), possible contamination (sewage) or particles of

the process medium adhering to the measuring device (adhesive materials).

NUS-7

Seite 4 NUS-7 K03/0617

5.Operating Principle

The sensor emits an ultrasonic pulse train and receives the echoes reflected. The

intelligent electronic device processes the received signal by selecting the echo

reflected by the surface and calculates from the time of flight the distance between

the sensor and the surface. A Norm signal output is available for remote transfer

whereas a relay contact is available for monitoring purpose.

A narrow beam angle ensures a reliable measurement in narrow silos with uneven

side walls as well as in process tanks with various protruding objects. Furthermore,

as a result of the narrow beam angle - the emitted ultrasonic signals have an

outstanding focusing - deep penetration through gases, vapour and foam is

ensured.

6.Mechanical connection

6.1 Block distance

Due to signal characteristics of the sensor, there is an area directly below the

sensor, where no pulses can be received (Dead Zone).

The so called Block distance (minimum measuring distance) is very important for

error free functioning of the level meter. It determines the minimal distance

between the sensor and maximum level. This distance can be extended by

programming in order to avoid disturbing effects of possible disturbing echoes

coming from fixed objects (Close-end Blocking).

Mount the sensor high enough that even with maximum filling of the container,

the block distance is not violated. Violation of the block distance may lead to

device-malfunction.

Model Block distance

NUS-7006 0.25 m

NUS-7

NUS-7 K03/0617 Seite 5

6.2 Installation (Liquid Level Measurement)

Never mount two ultrasonic level-measuring devices in one container,

because the two devices can interfere with each other's functioning.

POSITION

The optimal position of the NUS-4 is on

the radius

r = (0.3 … 0.5) R of the (cylindrical) tank

/ silo.

(Take also sonic cone on page 39 into

consideration.)

SENSOR

ALIGNMENT

The sensor face has

to be parallel to the

surface of the liquid

within 2-3.

TEMPERATURE

Make sure that the

transmitter will be

protected against

overheating by direct

sunshine.

Sunshade

OBSTACLES

Make sure that no in-

flow path or objects

(e.g. cooling pipes,

ladders, bracing

members,

thermometers, etc.) or

no tank wall of the

ragged surface

protrude into the

sensing cone of the

ultrasonic beam.

One fix object in the

tank / silo that disturb

the measurement can

be blocked out by the

optional programming

unit.

FOAM

Foaming of the liquid surface may render ultrasonic level

metering impossible. If possible, a location should be found,

where foaming is the least (device should be located as far

as possible from liquid inflow) or a stilling pipe or well should

be used.

WIND

Intensive air (gas) movements in the vicinity of the ultrasonic

cone is to be avoided. A strong draft of wind may "blow

away" the ultrasound.

Devices with lower measuring frequency (40, 20 kHz) are

recommended.

FUMES / VAPOURS

For closed tanks containing chemicals or other liquids, which

creats fume/gases above the liquid surface especially for

outdoor tanks exposed to the sun, a strong reduction of the

nominal measuring range of the ultrasonic device is to be

considered during device selection.

Devices with lower measuring frequency (40, 20 kHz) are

recommended in these cases units.

NUS-7

Seite 6 NUS-7 K03/0617

6.3 Installation (Open Channel Flow Measurement)

For ultimate accuracy, install the sensor as close as possible above the

expected maximum water level (see minimum measuring range).

Install the device in a place defined by the characteristics of the metering

channel along the longitudinal axis of the flume or weir.

In some cases foam may develop on the surface. Make sure that the surface,

opposite to the sensor remain free of foam for proper sound reflection.

From the point of view of measurement accuracy the length of the channel

sections preceding and following the measuring flume and their method of

joining to the measuring channel section are of critical importance.

Despite of the most careful installation, the accuracy of flow metering will be

lower than that of specified for the distance measurement. It will be determined

by the features of the flume or weir applied.

L Dmin

150 Ø 60

200 Ø 65

250 Ø 75

450 -

NUS-7

NUS-7 K03/0617 Seite 7

7.Electrical Connection

Make sure the terminals in the box are not under power (Use shielded cable 6 x 0.5

mm2 suggested in the technical data or stronger).

After powering the necessary programming can be performed.

Wire colours:

Green – relay C1 output

Yellow – relay CC output

Grey – relay C2 output

White – I, one of the points of current loop, power supply and HART (polarity

independent)

Brown – I, other point of current loop, power supply and HART (polarity

independent)

Black – GND, functional earthing and shielding point

Extension of the integrated cable:

Should extension be needed the use of connection box is suggested.

The shielding of the two cables should be connected and grounded at the signal

processing device.

NUS-7

Seite 8 NUS-7 K03/0617

8.Parameters – Description and Programming

The HART interface of the NUS-7 provides for access to the whole parameter set

and possibility of their programming. The parameter set can be reached by the use

of the software run on the PC connected through HART modem to the loop.

8.1 Measurement configuration

P00: c b a Engineering Units FACTORY DEFAULT: 000

Programming of this parameter will result in loading the factory default with the

corresponding engineering units.

Therefore all parameters should be set again!

a Operation

0 Liquid level measurement

b Engineering units

(according to “c”)

Metric US

0 m ft

1 cm inch

c Calculation system

0 metric

1 US

NUS-7

NUS-7 K03/0617 Seite 9

P01: 1 a Measurement Mode FACTORY DEFAULT: 11

Parameter value „a” will determine the basic measurement value that will be

transmitted. Subsequently values for the relays are also relating to these

quantities.

a Measure-

ment

mode

Transmitted

value Display

symbol

Distance Distance DIST

Level

Level LEV

Level % LEV%

Volume

Volume VOL

4 Volume % VOL%

Flow Flow

FLOW

LEV%

0100 [%]

LEV

DIST

P10

P11

Transmitted value DIST LEV=H-DIST LEV%=

P10

P10P11

*LEV 



Parameters to set P00

P01(a) =

P05 ≥X

P00

P01(a) = 1

P04 = H

P05 ≥X

P00

P01(a) =

P04 = H

P05 ≥X

P10 = X 0%

P11 = X100%

DIST

VOL

VOL%

0100 [%]

P10

P11

NUS-7

Seite 10 NUS-7 K03/0617

Transmitted value VOL

fP40…P45(H-DIST)

VOL%=

P10

XH P10P11

*VOL 



Parameters to set P00

P01(a) = 3

P02(b)

P04 = H

P05 ≥X

P40…P45

P00

P01(a) =

P02(b)

P04 = H

P05 ≥X

P10 = X 0%

P11 = X100%

P40…P45

A: Shortest measurable distance

B: Volume (content) pertaining to the greatest measurable level

C: Whole value of the vessel

D: diagram valid for the default value of P10 P11

P02:- c b a Calculation units FACTORY DEFAULT: 000

a Temperature

0 °C

1 °F

This table is interpreted according to P00(c), P01(a) and P02(c) and is irrelevant in

case of percentage measurement [ P01(a)= 2 or 4)]

c Time Attention!

NUS-7 is a level transmitter.

Although it can be used for

measuring weight, due to factors

involved in doing so, accuracy

may essentially be influenced.

0 s

1 min

2 hour

3 day

P04:-Maximum Distance to be Measured (H) FACTORY DEFAULT: XMas per chart

This is the only parameter that has to be programmed for each application

other than distance (however to avoid disturbing effect of possible multiple

echoes it is suggested to do this in distance measurement applications too).

b Volume Weight (set also P32) Volume flow

Metric US Metric US Metric US

0 m

- lb (pound) m

/time ft

/time

1 litre gallon tons tonnes litre/time gallon/

time

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