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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Seite 10 NUS-7 K03/0617
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

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The maximum distance to be measured is the greatest distance between the
surface of the transducer and the farthest level to be measured.
The factory programmed, greatest distances (DEFAULT values) which can be
measured by the units are listed in the table below. For the actual application the
maximum distance to be measured i.e. the distance between the sensor and the
bottom of the tank should be entered in P04.
NUS-7
Level
transmitter
for liquids
Maximum measuring distance XMm/feet
Transducer material PP / PVDF
NUS-7 6/20
Since the level is determined by calculating the difference between the value set
in P04 and distance (DIST) is measured by the unit, it is essential that the correct
value of (H) is set in P04. To obtain the best accuracy it is suggested that this
distance is measured in the empty tank.
P05: Minimum measuring distance (Dead zone - Close-end blocking)
FACTORY DEFAULT: Xmas per chart
The range, beginning with the sensor’s surface, within which (due to the
physical restraint of the ultrasound measurement system) measurement can
not be made, is called the dead zone. The NUS-7 will not accept any echo
within the blocking distance set here.
Close-end blocking may be represented as the extension of the dead zone
within which a possible echo will not be taken into consideration making
possible to exclude disturbing objects near to the sensor.
Automatic Close-end blocking =Dead Band control (P05 = Xm)
Device with factory default will automatically set the smallest possible dead
band depending on the conditions of the operation.
This will be under optimal conditions a bit smaller in unfavourable
circumstances greater than value given in the chart.
Manual Close-end-blocking with limitation ≥dead zone (P05>Xm)
By entering a value, higher than the factory default the close-end blocking will
be either the value programmed in P05 or the actual dead zone distance
(influenced by the actual conditions of the application) whichever is greater.

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P04
P46
hP06
NUS-7
for liquids Minimum measuring distance Xm m/feet
Sensor material PP / PVDF
NUS-7 0.25/0.82
P06: Far-end blocking FACTORY DEFAULT: 0
Far-end blocking is the
range below the level set in
parameter P06. The far-end
blocking can be used to
avoid disturbing effect of
stirrer or heaters at the
bottom of the tanks.
Detecting echoes in this
range the unit provides
special signals.
A.) Measuring level or
content
Level sinking below
the value of P06 current
output is according to the
value of the far-end
blocking and further
below SUB 0 (7/8 of P06)
the ERROR CODE 10 will
be transmitted via HART
P06=X
SUB0
X/8
20mA
4mA
H
Level rising over value of far-end blocking:
The calculation of level and volume will be based on the programmed tank
dimensions, therefore the measured or calculated process values will not be
influenced in any way, by the far end blocking value.
B.) Open channel flow metering
Far-end blocking will be used for those small levels below which
the accurate volume flow calculation is no longer possible.
Level in the flume/weir sinking below the blocked out range:
-Output current value will be according to the value of Q = 0
-0 value transmitted via HART for display of „No Flow” or 0
Level in the flume/weir rising over the blocked out range:
The calculation of volume flow will be based on the
programmed flume/weir data; therefore the measurement
values will not be influenced in any way, by the far end
blocking value.

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8.2 Current Output
P08: Fixed current output FACTORY DEFAULT: 0
By this step the output current can be set for a fix value selected from between 3.8
mA and 20.5 mA. This function is not operational as per the factory default: 0.
Attention: fixing output current will make settings in P10, P11, P12 and P19
irrelevant.
P10: Value (of distance, level, volume or flow) assigned to 4 mA current
output FACTORY DEFAULT: 0
P11: Value (of distance, level, volume or flow) assigned to 20 mA current
output FACTORY DEFAULT: XM– Xm
Values are interpreted according to P01(a). Assignment can be made so that the
proportion between the change of the (measured or calculated) process value and the
change of the current output be either direct or inverse. E.g. level 1 m assigned to
4mA and level 10 m assigned to 20 mA represents direct proportion and level 1 m
assigned to 20 mA and level 10 m assigned to 4 mA represents the inverse
proportion. Please note that in case of programming for (LEV or VOL) %
measurement the min and max value has to be entered in the relevant engineering
units of LEV (m, ft) or
VOL (m3, ft3).
Transmitting level
LEV
20,5
3,8mA
P11
P10 I
out
04 20
[mA]
A
DIST H
D
A: Smallest measurable dist.
D: diagram valid for default
values of P10 and P11

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P12: a Error indication by the current output FACTORY DEFAULT: 0
In case of error the NUS-7 will provide one of the current outputs below for the time
the error prevails. (For errors see Chapter 10).
aError indication by output
current
0HOLD (hold last value)
13.8 mA
2 22 mA
8.3 Relay Output
P13: a Relay function
aRelay function Also set:
0 DIFFERENTIAL LEVEL
CONTROL
(Hysteresis control)
Relay is energised if the
measured or calculated
value exceeds the value set
in P14
Relay is de-energised if the
measured or calculated
value descends under the
value set in P15
Relay
Level
P14
P15
Time
Energised:
De-energised:
P14, P15
There is a need to
set (in level min
20mm) hysteresis
between P14 and
P15
P14 > P15 –
normal operation
P14 < P15 –
inverted operation
1 Relay is energised in case of Echo Loss -
2 Relay is de-energised in case of Echo Loss -
3 COUNTER
Used for open channel flow
metering.
A 140 msec pulse is
generated every 1, 10, 100,
1.000 or 10.000 m3
according to P16.
P16= 0: 1m3
P16= 1: 10 m3
P16= 2: 100 m3
P16= 3: 1.000 m3
P16= 4: 10.000 m3
In de-energised state of the device the „C1” circuit is closed.
FACTORY DEFAULT: 2
P14: Relay parameter – Operating value FACTORY DEFAULT: 0
P15: Relay parameter – Releasing value FACTORY DEFAULT: 0
P16: Relay parameter – Pulse rate FACTORY DEFAULT: 0
FACTORY DEFAULTS: P14=0, P15=0, P16=0
C2 C1

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8.4 Digital communication
P19: Short (HART) address of the unit FACTORY DEFAULT: 2
These addresses with 0 … 15 are, in accordance with the HART standard, for
distinguishing units in the same loop.
Address: 0 current output of 4 … 20 ma operational
Address: 1 … 15 current output is fixed to 4 mA.
8.4.1 Measurement optimisation
P20: a Damping FACTORY DEFAULT: 5
This parameter can be used to reduce unwanted fluctuation of the display and
output.
a Damping (s) No or moderate fume /
waves Heavy or dense fume or turbulent waves
0 no filter For testing only
1 3 applicable not recommended
2 6 recommended applicable
3 10 recommended recommended
4 30 recommended recommended
5 60 recommended recommended
P22: a Dome top tank compensation FACTORY DEFAULT: 0
This parameter can be used to reduce disturbing effect of possible multiple echoes
a Compensation Remark
0 OFF In case the NUS-7 is not mounted in the centre of the
top and the top is flat.
1 ON In case the NUS-7 is mounted in the centre of a tank
with dome-shaped top
P24: a Target tracking speed FACTORY DEFAULT: 0
In this parameter evaluation can be speed up at the expense of the accuracy.
a Tracking
speed Remark
0Standard For most applications
1Fast For fast changing level
2 Special
Only for special applications (measuring range is
reduced to 50% of the nominal value)
The measuring window is inactive and the NUS-7 will
respond practically instantly to any target.

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Seite 16 NUS-7 K03/0617
P25: a Selection of Echo within the measuring window
FACTORY DEFAULT: 0
A so-called measuring window is formed around the echo signal. The position of
this measuring window determines the flight time for calculation of the distance to
the target. (the picture below can be seen on the test oscilloscope)
Received
signal
amplitude
Echo 1.
t
Echo 2.
t
Some applications involve multiple (target + disturbing) echoes even within the
measuring window. Basic echo selection will be done by the Quest + software
automatically. This parameter influences the echo selection only within the
measuring window.
a Echo in the window to
be selected Remark
0With the highest
amplitude
Most frequently used
1First one For liquids applications with multiple
echoes within the Measuring Window
P26: Level elevation rate (filling speed) (m/h or ft/h)
FACTORY DEFAULT: 2000
P27: Level descent rate (emptying speed) ) (m/h or ft/h)
FACTORY DEFAULT: 2000
These parameters provide additional protection against echo loss in applications
involving very heavy fuming. Correct setting increases reliability of the
measurement during filling and emptying. The parameters must not be smaller
than the fastest possible filling/emptying rate of the actual technology.
Attention! Level changing rate is rather different near to the conical or spherical
bottom of such a vessel.

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P28: a Echo loss indication FACTORY DEFAULT: 0
a Echo loss
indication Remark
0Delayed indication
During short echo-loss (for the period of twice the time set
in P20) analogue output will hold last value. After this
period the current value according to the setting in P12
and via HART ERROR CODE 2 will be transmitted.
1No indication For the time of echo-loss, analogue output will hold last
value.
2 Filling simulation Loosing echo during the filling process, transmitted value
will increase according to the filling speed set in P26
3 Immediate
indication
Loosing echo the current value (according to the setting in
P12) and the ERROR CODE 2
(via HART) will immediately be transmitted.
4 Empty tank
indication
Echo-loss may occur in completely empty tanks with a
spherical bottom due to deflection of the ultrasonic beam,
or in case of silos with an open outlet. In such cases it
may be useful to indicate empty tank instead of echo loss.
P29: Blocking out of disturbing object FACTORY DEFAULT: 0
One fixed object in the tank, disturbing the measurement, can be blocked out. By
the use of the Echo Map (P70) the precise distance of disturbing object can be
read out. This value should be entered in this parameter.
P31: Sound velocity at 20C (m/s or ft/s depending on P00(c)
FACTORY DEFAULT:: 343,8 (m/s), 1128 (ft/s)
This parameter should be used if the sound velocity in the gases above the
measured surface differs largely from that of in the air.
This is recommended for applications where the gas is more or less homogeneous.
If it is not, the accuracy of the measurement can be improved using 32-point
linearisation (P48, P49).
For sound velocities in various gases see section “Sound Velocities”.
HART
Current output
Holding value
Holding value
Error Code 2
Current 22mA P12=2
Holding last value P12=0
Current 3,8mA P12=1
Echo loss
Echo LED goes out 2 * ”P20” time

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P32: Specific gravity FACTORY DEFAULT: 0
Entering a value (other than “0”) of specific gravity in this parameter, the weight will
be displayed instead of VOL.
Engineering unit should be [kg/dm3] or [lb/ft3] depending on P00 (c)
Volume (content) measurement
P40: ba Tank shape FACTORY DEFAULT: 00
b
a Tank shape Also to be set
Attention!
The value „a”
determining
the shape of
the tank
should be set
first.
b
0 Standing cylindrical tank
shape (value of “b” as below) P40 (b), P41
0
1 Standing cylindrical tank with
conical bottom P41, P43, P44
0
2 Standing rectangular tank
(with chute) P41, P42, P43,
P44, P45
b
3 Lying cylindrical tank shape
(value of “b” as bellow) P40 (b), P41,
P42
0
4 Spherical tank P41
P41-45: Tank dimensions FACTORY DEFAULT: 0
Standing cylindrical
tank
with hemispherical
bottom a=0
Standing cylindrical
tank
with conical bottom
a=1 b=0
Standing
rectangular tank
with or without
chute a=2 b=1
b=0
P40 b=1
b=2
b=3
Plain
bottom
P43, P44
and P45 =
0
Lying cylindrical tank a = 3 Spherical tank a = 4, b = 0
b=0
b=1
b=2
b=3
P40

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Open channel flow measurement
P40: b a Devices, formula, data FACTORY DEFAULT: 00
ba Devices, formula, data Also to be set
KOBOLD Parshall channels
Type Formula Qmin [l/s] Qmax
[l/s]
“P” [cm]
00 GPA-
1P1
Q [l/s]= 60.87*h
1
.55
2
0.26 5.38 30 P46
01 GPA-
1P2
Q [l/s]= 119.7*h
1
.55
3
0.52 13.3 34 P46
02 GPA-
1P3
Q [l/s]= 178.4*h
1
.555 0.78 49 39 P46
03 GPA-
1P4
Q [l/s]= 353.9*h
1
.55
8
1.52 164 53 P46
04 GPA-
1P5
Q [l/s]= 521.4*h
1
.55
8
2.25 360 75 P46
05 GPA-
1P6
Q [l/s]= 674.6*h
1
.55
6
2.91 570 120 P46
06 GPA-
1P7
Q [l/s]= 1014.9*h
1
.55
6
4.4 890 130 P46
07 GPA-
1P8
Q [l/s]= 1368*h
1
.5
638
5.8 1208 135 P46
08 GPA-
1P9
Q [l/s]=
2080.5*h1.5689
8.7 1850 150 P46
09 General PARSHALL flume P46, P42
10 PALMER-BOWLUS (D/2) P46, P41
11 PALMER-BOWLUS (D/3) P46, P41
12 PALMER-BOWLUS (Rectangular) P46, P41, P42
13 Khafagi Venturi P46, P42
14 Bottom-step weir P46, P42
15 Suppressed rectangular or BAZIN weir P46, P41, P42
16 Trapezoidal weir P46, P41, P42
17 Special trapezoidal (4:1) weir P46, P42
18 V-notch weir P46, P42
19 THOMSON (90°-notch) weir P46
20 Circular weir P46, P41
21 General flow formula: Q[l/s]= 1000*P41*hP42, h [m] P46, P41, P42

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Seite 20 NUS-7 K03/0617
P41-45: Flume/weir dimensions FACTORY DEFAULT: 0
P40=00
KOBOLD Parshall flumes
P40=09 General Parshall flume
0.305 < P42(width) <2.44
 
026,0
569,1
305,0/h372s/lQ P42 P42  
2.5 < P42
Q[l/s]= K*P42*h1.6
P= 2/3*A
P42 [m] K
3.05 2.450
4.57 2.400
6.10 2.370
7.62 2.350
9.14 2.340
15.24 2.320