Kobold NUS-4x04 User manual

Instruction Manual
for
Ultrasonic Level Meter
Model: NUS-4...

NUS-4
Seite 2 NUS-4 K05/0216
1.Contents
1.Contents........................................................................................................2
2.Note ..............................................................................................................4
3.Instrument Inspection....................................................................................4
4.Regulation Use..............................................................................................4
5.Operating Principle........................................................................................5
6.Mechanical connection..................................................................................5
6.1Block distance......................................................................................5
6.2Installation (Liquid Level Measurement) ..............................................6
6.3Installation (Open Channel Flow Measurement)..................................7
6.4Mechanical connection ........................................................................8
7.Electrical Connection ....................................................................................8
8.Programming ................................................................................................9
8.1BASIC CONCEPTS AND ELEMENTS OF THE ULTRASONIC
MEASUREMENT.................................................................................9
8.2Programming without Display Module..................................................9
8.3Programming with the Display Module NUS-400P ............................11
8.3.1 Display Module NUS-400P ........................................................12
8.3.2Programming steps with the Display Module NUS-400P ...........13
8.3.3GET LEVEL Function ................................................................14
8.3.4INDICATIONS OF THE NUS-400P AND LED STATUS ............14
8.3.5QUICKSET ................................................................................15
8.3.6Full Parameter Access...............................................................17
9.Parameters – Description and Programming ..............................................18
9.1Measurement Configuration...............................................................18
9.2Current Output ...................................................................................21
9.3Relay Output......................................................................................22
9.4Measurement Optimisation ................................................................23
9.5Volume Measurement........................................................................26
9.6Volume Flow Measuring ....................................................................27
9.732- Point Linearisation .......................................................................31
9.8Informational Parameters (Read Out Parameters) ............................32
9.9Additional Parameters of Flow Metering in Open Channels...............33
9.10Test Parameters ................................................................................33
9.11Simulation ..........................................................................................33
9.12Access Lock.......................................................................................34
10.Error Codes.................................................................................................34
11.Parameter Table .........................................................................................35
12.Sound Velocities in Different Gases............................................................36
13.Technical Data ............................................................................................37
14.Order Codes ...............................................................................................38
15.Dimensions .................................................................................................39
16.EU Declaration of Conformance..................................................................40

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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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Seite 4 NUS-4 K05/0216
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-4
Instruction Manual
4.Regulation Use
Model NUS-4 is a compact user friendly ultrasonic level meter comprising of an
ultrasonic sensor and an integrated evaluating electronics. It was specifically
developed for level and volume measurement in open and closed vessels or for
flow measurement in open channels.
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-4x04 0,20 m
NUS-4x06 0,25 m
NUS-4x08 0,35 m
NUS-4x10 0,35 m
NUS-4x15 0,45 m
NUS-4x25 0,60 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
An intensive air (gas) movement 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
creates 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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STAND-OFF PIPE
The structure of the stand off pipe should be rigid; the inner rim where the ultrasonic beam leaves the
pipe should be rounded.
L
Ø D
r
LDmin
r
Ø D
L
LDmin
NUS-
4x04 NUS- 4x06 NUS- 4x08 NUS- 4x10 NUS- 4x15 NUS- 4x25*
150 50 60 60 90 80 130 -
200 50 60 75 200 80 140 -
250 65 65 90 350 85 150 -
300 80 75 105 500 90 160 -
350 95 85 120
L
ØD
LDmin
NUS-4x10 NUS-4x15
90 80 130
200 80 140
350 85 150
500 90 160
*NUS-4x25
mut not be mounted on a pipe socket, since the sensor surface should protrude into the vessel
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 remains 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.

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6.4 Mechanical connection
Screw the unit in to its place. Use open wrench for
tightening; max torque is 20Nm
After tightening the enclosure can be rotated to the proper
position. (Safety bolt prevents rotation more than 350°)
7.Electrical Connection
Ensure that the power supply is turned off at the source.
The unit may be damaged by electrostatic discharge (EDS) via its terminal, thus
apply the precautions commonly used to avoid electrostatic discharge e.g. by
touching a properly grounded point before removing the cover of the enclosure.
With removal of the cover of the housing and taking out the display module (if
any), the screw terminals can be accessed. Suggested cable core cross section:
0.5 ... 1.5 mm2. Arrange grounding by the inner or outer grounding screw first.
Switch on the unit and make necessary programming.
The actual loop current can be measured with an accuracy of 0.5% by
connecting an voltmeter (in the range of 200 mV) to the points indicated on the
drawing
After programming ensure proper sealing and closing of the cover.
2
1

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8.Programming
8.1 BASIC CONCEPTS AND ELEMENTS OF THE ULTRASONIC
MEASUREMENT
Programmed
measurement
range of the
application
P06
Far end blocking
DIST= distance (measured)
Close endblocking (programmed value
LEV= level calculated; H - DIST)
VOL= volume (calculated from DIST LEV)

Max measuring distanceof theapplication(H)
Max measuring distance ofthe device DEFAULT value of P04 XM
Max measurement range of the device
Min measuring distance (deadband) DEFAULTvalue of P05
programmed value of P04
Xm
8.2 Programming without Display Module
Programming is only possible if the Transmitter is in Level Measuring Mode and
receives valid echo i.e. “VALID” LED is lit!
The following can be programmed without display module
Assignment of the 4 mA to a required e.g.
min. level / max. distance
Assignment of the 20 mA to a required e.g.
max. level / min. distance
Error indication by the current output (Hold,
3.6 mA or 22 mA)
Damping (10, 30 or 60 sec)
Reset to the factory default
Note:
Current output can also be assigned in inverted mode:
4 mA = 100 % (Full), 20 mA = 0 % (Empty)

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Procedure of programming: press button in the relevant sequence and check the
state of the LED-s. Symbols for the states of the LED-s:
= LED is off, = LED is blinking, = LED is on, = LEDs are blinking
alternatively = Dont care
Minimum level, (0%, empty tank) assignment to 4 mA
Place the sensor at a distance to an object corresponding to the maximum
distance/ the minimum level.
Action Led state following the action
B
B
Use level in tank or a fix target e.g.
the wall
1) Check for a valid ECHO = Valid ECHO, transmitter
programmable
2) Press NEXT button
steadily = NUS-4 in programming mode
3) Press UP button
steadily
= 4 mA assigned to the distance
(see picture)
4) Release buttons = Programming completed
Maximum Level, (100 %, full tank) assignment to 20 mA)
Place the sensor at a distance to an object corresponding to the minimum
distance/ the maximum level.
Action Led state following the action
B
B
Use level in tank or a fix target e.g.
the wall
1) Check for a valid ECHO = Valid ECHO, transmitter
programmable
2) Press NEXT button
steadily = NUS-4 in programming mode
3) Press DOWN button
steadily
= 20 mA as signed to the distance
(see picture)
4) Release buttons = Programming completed
“Error state” indication by the analogue signal (Check for a valid echo as
above)
As a result of this setting the value of the analogue output will be 3.8 mA; 22 mA or
according last value (hold) until the error is ceased.
Action Led state following the action
1) Press button steadily = NUS-4 in programming mode
2) Press any of the DOWN ,
ENTER
E
, NEXT buttons
steadily
– hold last value
= – 3.6 mA
– 22 mA
3) Release buttons = Programming completed

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Damping time setting (Check for a valid echo as above)
Action Led state following the action
1) Press ENTER
E
button
steadily
= NUS-4 in programming mode
2) Press any of the NEXT
, UP , DOWN
buttons steadily
– 10 sec
= – 30 sec
– 60 sec
3) Release buttons = Programming completed
RESET: Returning to the default (Check for a valid echo as above)
Action Led state following the action
1) Press NEXT button
steadily = NUS-4 in programming mode
2) Press ENTER
E
button
steadily = Default loaded
Indication of mistakes (by LEDs) made during programming
Action Led state following the action Possible correction
Attempted programming = blinking twice = no Echo Find a valid Echo
Attempted programming = blinking three times = no access
possible
With NUS-400P only See 8.3 (P99)
Attempted programming = blinking four times = NUS-4 not in
Level Measurement Mode With NUS-400P only See 8.3 (P01)
8.3 Programming with the Display Module NUS-400P
All features of the unit can be set, such as measurement configuration and
optimisation, 32-point linearisation, dimensions for 11 tanks with different shape
and for 21 different open channels (flume, weir, etc).
Devices with the type number NUS-xxxx xx xxP are already equipped with the
display module.
The NUS-4 is also fully operational without display module. The module is only
needed for programming and/or displaying measurement values.
The unit will measure during programming in accordance with the previous
parameters. The new, modified parameters will only be effective after returning to
the Measurement Mode
If the transmitter is left in Programming Mode by mistake, it will automatically return
to Measurement Mode after 30 minutes and will operate with the parameters
entered during the last completed programming.

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Seite 12 NUS-4 K05/0216
The NUS-4 will be delivered with the following Factory Default:
Current output, display and bargraph: LEVEL
Current output and bargraph proportional to the level
4 mA: assigned to the minimum level 0 %
20 mA: assigned to the maximum level 100 %
Error indication by the current output: hold last value
Damping: 60 sec
The display module supports two separately accessible programming modes
representing 2-layers of programming complexity, depending on user choice.
PLUG-IN DISPLAY MODULE
QUICKSET FULL
PARAMETER
ACCESS
8.3.1 Display Module NUS-400P
Symbols used on the LCD
DIST – Distance
(measuring) mode
LEV – Level (measuring)
mode
VOL – Volume
(measuring) mode
FLOW – Open channel
(flow metering) mode
PROG - Programming
mode (device under
programming)
RELAY – ‘C2’ circuit of
the relay is closed
T1 - TOT1 volume flow
totaliser (resetable
aggregate)
T2 - TOT2 volume flow
totaliser (aggregate)
FAIL - Measurement /
device error
- Level changing
direction
Bargraph assigned to the current
output or echo strength
Symbols used on the frame
M– Metric system
US – US calculation
system
LEDs lit
VALID – presence of
valid echo

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8.3.2 Programming steps with the Display Module NUS-400P
Programming will be performed by the pressing and releasing the relevant one or two
keys (simultaneously).
Single key pressing
ENTER
E
to select parameter address and go to parameter value
to save parameter value and return to parameter address
NEXT to move the blinking (sign of change) of the digit to the left
UP to increase value of the blinking digit
DOWN to decrease value of the blinking digit
Double key pressing
Press the two keys simultaneously for desired programming step.
Enter into or quit programming modes Basic steps while parameter address is
blinking Basic steps while parameter value is blinking
E
Quickset
FullParameter
Access
E
Return to default*
* LOAD readout ** CANCEL readout
Cancelallmodifications**
Parametervalue
Default
E
Display default value
* cancellation immediatelyactive
Cancelallmodifications
returntoparameteraddress*
Parametervalue
Actual
yy parameter address (P01,
P02…P99)
xxxx parameter value (dcba)
bargraph
yy : xxxx

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8.3.3 GET LEVEL Function
Special function used only in level and distance measurement modes UP
+ DOWN
Notes:
If after pressing ENTER
E
blinking does not spring over from the parameter address to
the parameter value this means that
the parameter is either a read-out type, or
the secret code prevents the modification (see P99)
If the modification of the parameter value is not accepted i.e. the parameter value keeps
blinking after pressing ENTER
E
,
the modified value is either out of the range, or
the code entered is not a valid code
8.3.4 INDICATIONS OF THE NUS-400P AND LED STATUS
LED Indication
VALID (ECHO)-LED
Lit in case of valid echo
RELAY-LED
ON, when the “C2” circuit of
the relay is closed
NUS-400P indications
Depending on the measurement
one of the below symbols will lit
and the process value displayed
(see P01 chapter 9.1).
Engineering units will be
indicated directly (°C, °F and mA)
and by the lit arrow showing
towards them on the frame
DIST distance
LEV level
VOL volume
FLOW flow
T1/T2 totalised values
FAIL (blinking) Error code
displayed
For paging readouts NEXT
key should be pressed.
The following process values can be
displayed
Volume / Flow – if programmed so
Level – if programmed so
Distance – if programmed so
Warning indications – FAIL blinking
Display screens can be scrolled by pressing
key NEXT .
To return to the screen of the selected
measurement mode key ENTER
E
should
be pressed (see P01 chapter 6.1)
Temperature can be displayed by pressing
UP .
(°C/°F)
Current output value can be displayed by
pressing DOWN .
(mA)
(Vol/Flow)
(Distance)
(Error)
See
for possible readouts
P01

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8.3.5 QUICKSET
Recommended as a simple and fast way to start up NUS-4.
QUICKSET programming (aided by 6 screens) is used in
uncomplicated level metering applications to set the 6 basic
parameters. The other parameters can only be modified in the
Full Parameter Access Mode see 9.1 (P01).
Engineering unit for the display (Metric or US)
Maximum measuring distance (H)
Assignment of min level to 4 mA
Assignment of max level to 20 mA
Error indication by the current output
Damping time
QUICKSET program mode can only be used in measuring mode
Level (LEV) (see P01 in 9.1 Measurement Configuration)
Keys Function
ENTER
E
+ DOWN (press for
min 3 secs!)
Enter or exit QUICKSET programming mode
UP , DOWN , NEXT Increase/decrease and move left the blinking digit
UP + DOWN “GET LEVEL" - display actual level measured by the NUS-4
ENTER
E
Save readout and step to the next screen
NEXT + UP Quit Current Output Scaling without saving the modifications
(CANCEL)
NEXT + DOWN Display of the DEFAULT value.

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Screens Actions
APplication
xx= select “EU” (European) for metric or “US” for US engineering units (Use
UP / DOWN keys)
yy= indicating “Li” for liquids
DEFAULT: EU
Programming of this parameter will result in loading the
factory default
with the corresponding engineering units.
H = xxxx maximum measuring distance – Distance between transducer
face and tank bottom
Manual: set value (Use UP / DOWN / NEXT keys) and save it (by
ENTER
E
)
Automatic: use the “GET LEVEL” function (UP + DOWN ) to obtain
actual measured value with level in tank or a fixed target, i.e. wall. (“GET
LEVEL” functions only if ECHO LED is lit) and save it as above.
DEFAULT: maximum measuring distance [m], see Technical Data Table
4 mA xxxx – level value assigned to 4 mA current output
Manual: set level value (by UP / DOWN / NEXT keys) and save it
(by ENTER
E
)
Automatic: use the “GET LEVEL” function (UP + DOWN ) to display the
actual measured value with level in tank or a fixed target, i.e. wall. (“GET
LEVEL” functions only if ECHO LED is lit) and save it as above.
DEFAULT: 0 m (0%, Empty tank)
20 mA xxxx – level value assigned to 20 mA current output
Manual: set level value (Use UP / DOWN / NEXT keys) and save it
(by ENTER
E
)
Automatic: use the “GET LEVEL” function (UP + DOWN ) to obtain
actual measured value with level in tank or a fixed target, i.e. wall. (“GET
LEVEL” functions only if ECHO LED is lit) and save it as above.
DEFAULT: max. level = max. measuring distance – dead band [m] (100%,
Full tank) (See Technical Data Table)
Error indication by the current output – select “Hold”, 3.8 mA or 22 mA (by
UP / DOWN key) and save it as above.
DEFAULT: hold last value
damping time:select required damping time (by UP / DOWN key) and
save it as above.
DEFAULT: 60 sec for liquids, 300 sec for solids
Note: – Current output can also be programmed for inverted operation: 4 mA=
100 % (Full), 20 mA= 0 % (Empty)
– Description of failures can be found under the chapter 10 Error codes.
H:xxxx
AP:xxy
y
4:xxxx
E
r
:xxxx
20:xxxx
dt: xxxx

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8.3.6 Full Parameter Access
Full Parameter Access is the highest programming level to access all features:
Example:
Setting the measurement
Programming of the output
Optimization of measurement
Selection of 11 pre-programmed tank shapes for volume measurement
Selection of 20 pre-programmed measurement channels for the flow
measurement in open channels
Keys Function
ENTER
E
+ NEXT
(press for 3 seconds)
Enter or exit Full Parameter Access programming mode.
In this programming mode, the display will indicate:
yy Parameter Adress (P01, P02 … P99)
xxxx Parameter value (dcba)
Bar graph
Note: Measuring is going on during programming in accordance with
the old parameter set. New parameter set will be valid after returning
to the Measurement to the Programming Mode.
Steps and indications of the Full Parameter Access programming mode
pressing Keys while Parameter Address is blinking while Parameter Value is blinking
ENTER
E
Go to the Parameter Value
Save the modification of the
Parameter Value and return to the
Parameter Address
NEXT + UP Cancel all modifications of the actual
programming phase. Pressing for 3
sec is required while CANCEL will be
displayed for warning
Neglect the modification of the
Parameter Value.
and return to the Parameter Address
without saving the modifications
NEXT + DOWN Reset entire device to Factory
Default.
Since this action will reset all
parameters, “LOAD” will appear on
the display:
- to confirm, press
- to escape, press any other key
- Exception: clearing TOT 1 (See at
P77)
Display default of the Parameter
Values
(it can be saved by pressing ENTER
E
)
NEXT Move blinking (changeability) of the digit to the left
UP / DOWN Modify the blinking digit (increase, decrease) or scroll up/down
yy:xxxx

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9.Parameters – Description and Programming
9.1 Measurement Configuration
P00:- cba Application/Engineering Units
Programming of this parameter will result in loading the factory default with the
corresponding engineering units.
a Operating (measurement) mode
0 Liquid level measurement
b Engineering units
(according to “c”) Attention: mind the sequence!
When programming this parameter the
right value “a” will be blinking first.
Metric US
0 m ft
1 cm inch
c Calculation system
0 Metric
1 US
FACTORY DEFAULT: 000
P01:- ba Measurement Mode – Bargraph
Parameter value „a” will determine the basic measurement value that will be displayed and
proportional with the current output. Depending on the value of “a” process values as listed in
the 3d column can also be displayed by pressing NEXT . For return to the display of the
basic value the ENTER
E
key should be pressed.
a Measurement
Mode Display symbol Displayed values
Attention: mind the
sequence!
When programming this
parameter the
right value “a” will be
blinking first.
0 Distance DIST Distance
1 Level LEV Level, Distance
2 Level in
percentage LEV% Level%, Level, Distance
3 Volume VOL Volume, Level, Distance
4 Volume in
percentage VOL% Volume%, Volume, Level, Distance
5 Flow FLOW Flow, TOT1, TOT2, Level,
Distance
Parameter value “b” will determine that the height of the Bargraph will be proportional to the
current output or to the Echo strength.
b Bargraph indication
0 Echo strength
1 Current output FACTORY DEFAULT: 11

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NUS-4 K05/0216 Seite 19
P02:- cba Calculation units
a Temperature Attention: mind the sequence!
When programming this parameter the right
value “a” will be blinking first.
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)
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 liter gallons tons tons liter/time gallons/time
c Time
0 Sec
1 Min
2 Hour
3 Day FACTORY DEFAULT: 000
P03:- - - a Values displayed - Rounding
It is important to keep in mind that the instrument is measuring distance as basic quantity.
Measured Distance Resolution The resolution depending on the distance can be
considered as a kind of rounding that will be contained in
all further value (of level, volume or volume flow)
calculated. Therefore if programmed for DIST or LEV
measurement the setting of P03 is irrelevant.
Xmin – 2m 1mm
2m – 5m 2mm
5m – 10m 5mm
10m over 10mm
Displayed VOL or FLOW
Displaeyed Value Display Format Obviously the decimal position will be shifted with
increasing value displayed. (See table at the left).
Values over one million will be displayed in exponential
format whereas the value (e) represents the exponent.
Over the value of 1x1010 Err4 (overflow) will be displayed.
0,000 – 9,999 x,xxx
10,000 – 99,999 xx,xx
100,000 – 999,999 xxx,x
1000,000 –
9999,999
xxxx,x
10000,000 –
99999,999
xxxxx,x
100000,000 –
999999,999
xxxxxx,x
1 millió –
9,99999*109
x,xxxx : e
(exponential
format)
1*10
10
over (overflow) Err4
Rounding
Parameter Value
“a” Steps In The Displayed Value A couple of millimetres of fluctuation of the basic DIST
value (e.g. due to waves) will be enlarged by the
mathematical operations. This enlarged fluctuation in
displaying VOL or FLOW can (if disturbing) be avoided by
rounding to be set in P03. Rounding value 2, 5, 10 etc
represents the steps by which the calculated value will be
changed in its (one or two) last digit(s).
Examples:
P03=1 steps by 2: 1,000; 1,002; 1,004
P03=5 steps by 50: 1,000; 1,050; 1,100 or 10,00;
10,05(0); 10,10(0); 10,15(0)
(the 0 from the steps 50, 100, 150 etc will not be
displayed)
0 1 (no rounding)
1 2
2 5
3 10
4 20
5 50
FACTORY DEFAULT: 0

NUS-4
Seite 20 NUS-4 K05/0216
P04 Maximum Distance to be Measured (H)
The maximum distance to be measured is the greatest distance between the surface of the
transducer and the level to be measured.
This is the only parameter that has to be programmed for each application other than
distance (however to avoid disturbing effect of possible multiple echos it is suggested
to do this in distance measurement applications too).
Values of the maximum measuring distance will be displayed as below.
Engineering Unit Display Format
m x,xxx or xx,xx
cm xxx,x
ft xx,xx or xxx,x
inch xxx,x
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.
To obtain the best accuracy, measure this distance in the empty tank with the NUS-4 by using
the “GET LEVEL” function (by double key pressing of UP + DOWN ) provided the bottom
is flat. Enter the actual measured value displayed as P04.
Model Factory default of maximum measuring distance (m/ft)
NUS-4x04 4/13
NUS-4x06 6/20
NUS-4x08 8/26
NUS-4x10 10/33
NUS-4x15 15/49
NUS-4x25 25/82
FACTORY DEFAULT: acc. to the table
P05: Minimum measuring distance (Dead zone- Close-end blocking)
The NUS-4 will not accept any echo within the blocking distance set here.
Automatic Close-end-blocking (Automatic Dead Band control)
By using the factory default value, the unit will automatically set the smallest possible close-
end-blocking distance i.e. the dead band.
Manual close-end-blocking
Manual close-end-blocking should be used for example to block out the echo originating from
the bottom rim of a stand-off pipe or from any object protruding into the ultrasonic cone near to
the transmitter.
By entering a value, higher than the factory default, the minimum measuring range will be
extended and fixed to the specified value.
To return to the factory programmed (DEFAULT value) of the minimum measuring distance press
NEXT + DOWN .
Model Factory default of minimum measuring distance Xm(m/ft)
NUS-4x04 0,2 / 0,65
NUS-4x06 0,25 / 0,82
NUS-4x08 0,35 / 1,2
NUS-4x10 0,35 / 1,2
NUS-4x15 0,45 / 1,5
NUS-4x25 0,60/2,02
FACTORY DEFAULT: automatic dead band control