Kobold NGR User manual

Contents
1 NGR level sensor......................................................................................................... 4
1.1 Principle of operation................................................................................... 4
1.2 Safety notes.................................................................................................. 4
1.3 Fields of application .................................................................................... 4
1.4 Installation conditions ................................................................................ 5
1.5 Electrical connection ................................................................................... 8
1.6 Display .......................................................................................................... 8
1.7 Mounting the coaxial tube........................................................................... 9
1.8 Shortening/replacing the probe..................................................................10
1.9 Mounting the probe rod...............................................................................12
2 Commissioning the NGR.............................................................................................13
2.1 Quick commissioning (with factory settings)..............................................13
2.2 Advanced commissioning............................................................................13
2.3 Foam commissioning (with factory settings)..............................................15
3 Con iguring the switching outputs .............................................................................17
3.1 Switching hysteresis and window function.................................................17
3.2 N/O output with con igurable hysteresis....................................................18
3.3 N/C output with con igurable hysteresis ....................................................19
3.4 N/O output with window function ...............................................................20
3.5 N/C output with window function ...............................................................21
3.6 N/O output with error signal........................................................................22
3.7 N/C output with error signal........................................................................22
4 Con iguring the analog output ...................................................................................23
4.1 Automatic signal detection..........................................................................23
4.2 Current output 4-20 mA ..............................................................................23
4.3 Voltage output 0-10 V..................................................................................23
5 Advanced functions ....................................................................................................24
5.1 Expert mode .................................................................................................24
5.2 Filtering measured values ...........................................................................24
5.3 Testing the con iguration .............................................................................24
5.4 Con iguring the probe length.......................................................................25
5.5 Teaching in static interference signals.......................................................25
5.6 Evaluating signal quality..............................................................................26
5.7 Changing the coaxial cable length..............................................................27
5.8 Activating the display lock ...........................................................................27
Contents
2

5.9 Selecting the display unit (millimeter/inch) ...............................................27
5.10 Setting the offset .......................................................................................28
6 Menu overview............................................................................................................29
7 Troubleshooting ..........................................................................................................37
7.1 Error message on the display......................................................................37
7.2 Operating the display...................................................................................38
7.3 Outputs ........................................................................................................ 39
7.4 Behavior....................................................................................................... 39
8Technical data............................................................................................................ 41
8.1 Features....................................................................................................... 41
8.2 Performance................................................................................................ 41
8.3 Reference conditions.................................................................................. 42
8.4 Measurement accuracy.............................................................................. 43
8.5 Mechanics/materials................................................................................. . 45
8.6 Electrical connection values....................................................................... 45
8.7 Environmental conditions........................................................................... 46
8.8 Dimensional drawings ................................................................................ 46
8.9 Factory settings........................................................................................... 49
9Accessories................................................................................................................ 50
10 Maintenance............................................................................................................ 51
11 Returning the level sensor...................................................................................... 51
12 Disposal ................................................................................................................... 51
13 Medium list .............................................................................................................. 51
14 EU Declaration of Conformance................................................................................58
Contents
3

1 NGR Sensor
4
1 NGR level sensor
1.1 Principle of operation
The NGR uses TDR (Time Domain Reflectometry) technology. This is a process to determine transit
times of electromagnetic waves. The sensor electronics generate a low-energy electromagnetic
pulse, which is linked to and runs along the probe. If this pulse strikes the surface of the liquid to be
measured, a portion of the pulse is reected there and is conducted back up along the probe path
to the electronics, which then calculate the level based on the time difference between the sent and
the received pulse. The sensor can output this level as a continuous measured value (analog output)
and can also derive two or four freely positionable switching points from it (switching outputs).
1.2 Safety notes
■
Read the operating instructions prior to commissioning.
■
These operating instructions are valid for devices from rmware version 4.00.
■
Connection, mounting, and setting may only be performed by trained specialists.
■
The NGR is not a safety component under the EU Machinery Directive.
■
Observe national safety and work safety regulations.
■
Repairs may only be carried out by the manufacturer. Altering or tampering with the device is not
permitted.
■
Wiring work and the opening and closing of electrical connections may only be carried out when
the power is switched off.
■
The radiated power is far lower than that from telecommunication equipment. According to current
scientic research, the operation of this device can be classied as safe and nonhazardous.
■
Incorrect handling or improper use can lead to malfunctions in your application.
1.3 Fields of application
The innovative TDR technology enables reliable level measurement which is largely application-inde-
pendent. The NGR is suitable for both continual level measurement and limit level detection in
nearly all liquids.
It is not affected by changes in the properties of the liquids to be measured. The NGR can be used
in metal containers or bypass/immersion pipes. A coaxial tube is required for use in plastic
containers.

1 NGR level sensor
5
1.4 Installation conditions
The NGR is mounted vertically from above into the container or bypass, using its process
connection. The NGR level sensor has a G ¾ or ¾" NPT threaded connection. Observe a minimum
connection diameter in accordance with the following Diagrams 1 and 3. The NGR must be
installed so that after mounting there is sufficient distance to other tank components (e.g., supply
tubes, other measurement devices), the container wall, or the container bottom. Minimum
distances are also described in Diagrams 1 and 3. The NGR can also be used in a metal
immersion pipe or bypass. The installation conditions are shown in Diagram 2. Ensure that there is
a good metallic connection between the NGR measuring device and the tank/bypass. When
operating the sensor, ensure that the ambient temperature is not above or below the limits.
Insulating the sensor housing is not permitted for tanks with hot media. When positioning the
device, ensure that the sensor is not directly exposed to the filling flow. The sensor housing can be
rotated 360°, allowing for the cable outlet to be positioned freely.
Installation in a container
Note: The distances are the same for the sensor with remote amplier.
D
C A
B
B
Unit with mono probe mounted
in metal tank
Mono probe With coaxial tube
Installation in nozzle:
D ≥ DN 25 (1")
Distance tank wall/tank bottom:
A ≥ 50 mm (1.97")
B ≥ 10 mm (0.40")
Distance to other tank fittings
≥ 100mm (3.94")
Unit with coaxial tube for metal
and non metal tank
C = with a coaxial tube there are no
minimum distances to the tank wall
or to other tank fittings required
.
Diagram 1

1 NGR level sensor
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Installation in a metal immersion tube or metal bypass
D
B
D ≥ DN 40
Distance tank wall/tank bottom
B ≥ 10 mm (0.40")
center
Diagram 2
Centering: To prevent contact between the probe and the bypass pipe during oscillations, the probe
should be centered according to its length and depending on the diameter of the bypass pipe. To
do this, it is necessary to insert one or two centering pieces.

1 NGR level sensor
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Rope probe mounted in metal tank
Installation in nozzle:
D
≥ DN 25 (1")
Distance tank wall/tank bottom:
A
≥ 50 mm (1.97")
Distance to other tank fittings
≥ 100 mm (3.94")
Holder rope fixation
Rope weight
F = 250 N
max.
Mono probe xing
M = Measuring range
X = No measuring possible
in this area
Diagram 3
Tank welds can affect the measurement accuracy.

1 NGR level sensor
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1.5 Electrical connection
The sensor is connected using a pre-assembled female cable connector with 1 x M12 plug connector
(5 or 8-pin). With the power switched off, plug the female cable connector into the sensor and screw
it tight. Connect the cable according to its function. After the supply voltage has been applied, the
sensor carries out a self-test. Once installed, the sensor is ready for operation on completion of the
self-test (< 5 s). The display shows the current measured value.





1 L+: Supply voltage, brown
2QA: Analog current/voltage output, white
3M: Ground, reference potential for current/voltage
output, blue
4 C/Q1: Switching output 1, PNP,
black
5Q2: Switching output 2, PNP/NPN, gray







1L+: Supply voltage
2Q2: Switching output 2, PNP/NPN
3M: Ground, reference potential for current/voltage
output
4 C/Q1: Switching output 1, PNP/
5Q3: Switching output 3, PNP/NPN
6Q4: Switching output 4, PNP/NPN
7QA: Analog current/voltage output
8No function
The wire colors for 8-pin cables are not uniform.Always note
the pin assignment of the sensor.
1.6 Display
All lengths specied (in mm) in the menu refer to the end of the probe or for a congured offset (see
“5.4 Conguring the probe length”) on the tank bottom. You can access the menu by pressing the Set
pushbutton for at least three seconds.
Variants with two switching outputs
Q1 Q2
1000 mm 39,4 in
Note: The statuses of the switching outputs are indicated in millimeters by bar graphs above the unit.
This display is not available when inches are selected as the unit.

NGR
1 NGR level sensor
9
Variants with four switching outputs
Q1/2/3/4
1000 mm 39,4 in
Arrow pushbuttons: For navigating in the menu and changing values
Set pushbutton: For saving and conrming
Esc pushbutton: For exiting the operating menu step-by-step
coaxial
tube
1.
Mount spacer on rod
probe
2.
Screw coaxial
probe
1.7 Mounting the coaxial tube
Retrofitting of coaxial probe:Mount the spacer on the rod probe
(first one at approx. 500 mm from thread, then every 500 mm) and make 2 to 3 punch marks on
both sides of each spacer on the rod probe. Do not pull the spacers over the punch marks.
Punch marks prevent sliding of the spacer in both
directions.

1.8 Shortening or replacing the probe rod/cable probe*
If the probe rod or cable probe*is too long for the application, it can be shortened to the
container height. In this case, you should not shorten the probe beyond its minimum length of
100 mm.
Procedure: Shorten the probe rod or cable probe*as desired. Set the new probe length in the NGR
as described in Chapter “5.4 Configuring the probe length”. Ensure that this correction corresponds
to the probe length, because an incorrect value in the Length menu has a direct effect on
measurement accuracy and can lead to faults. The probe rod or cable probe*can be replaced on
the NGR. Use a suitable tool. If the system experiences strong vibrations, secure the probe with
thread locker.
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* in preparation