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.: [phone]
Fax: [phone]
Internet: http: //www.kobold.com
e-mail: [email protected]

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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).

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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

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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.

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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 -

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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.

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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

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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
0
Distance Distance DIST
1
Level
Level LEV
2
Level % LEV%
3
Volume
Volume VOL
4 Volume % VOL%
5
Flow Flow
FLOW
A
X m
LEV%
0100 [%]
LEV
0
DIST
0H
D
DIST H
P10
P11
H
Transmitted value DIST LEV=H-DIST LEV%=
P10
m
XH
P10P11
*LEV 


Parameters to set P00
P01(a) =
0
P05 ≥X
m
P00
P01(a) = 1
P04 = H
P05 ≥X
m
P00
P01(a) =
2
P04 = H
P05 ≥X
m
P10 = X 0%
P11 = X100%
A
DIST
H
VOL
0
VOL%
0100 [%]
P10
P11
B C
D

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Transmitted value VOL
fP40…P45(H-DIST)
VOL%=
P10
m
XH P10P11
*VOL 


Parameters to set P00
P01(a) = 3
P02(b)
P04 = H
P05 ≥X
m
P40…P45
P00
P01(a) =
4
P02(b)
P04 = H
P05 ≥X
m
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
3
ft
3
- lb (pound) m
3
/time ft
3
/time
1 litre gallon tons tonnes litre/time gallon/
time