KTR NVT-E Series Product guide

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NVT-E
Operating-/Assembly Instructions

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The series of level switches NVT-E is suitable for monitoring level and temperature in tanks in fluid
systems. Depending on the model, the level switches are equipped with a different number of switching
outputs.
Please find the configuration on the type plate. Here you find the order acknowledgement number, the
product key and the model description.
Table of Contents
1 Technical Data
2 Hints
2.1 General Hints
2.2 Safety and Advice Hints
2.3 General Hints to Danger
2.4 Proper Use
3 Assembly
3.1 Starting (General)
4 Operation
4.1 Switching On
4.2 LED-Status Display
4.3 Key Functions
4.4 Key Lock Active
4.5 Summary of Menu
4.6 Amendment of Basic Settings
4.6.1 Defining Charging Level
4.6.2 Defining Temperature
4.6.3 Re-assignment of Switching Outputs
4.6.4 Setting Updating Rate of Display
4.6.5 Activating/Deactivating Key Lock
4.6.6 Scaling of Charging Level
4.6.7 Maximum Displayed Value of Charging Level
4.6.8 Minimum Displayed Value of Charging Level
4.6.9 Resetting Factory Settings (Reset)
4.6.10 Factory Settings
4.7 Switching Outputs
4.7.1 Definition of Switching Characteristics
4.7.2 Upper Switching Limit (Set Point)
4.7.3 Lower Switching Limit (Reset Point)
4.7.4 Delay for Set Point
4.7.5 Delay for Reset Point
4.7.6 Testing the Switching Output
4.7.7 Changing Display Function of Status LED

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Table of Contents
4.8 Analogue Outputs
4.8.1 Assignment of Upper Limit
4.8.2 Assignment of Lower Limit
4.8.3 Defining the Type of Signal
4.8.4 Testing the Analogue Output
4.9 Diagnostics
4.9.1 Opening the Journal
4.9.2 Maximum/Minimum Charging Level
4.9.3 Maximum/Minimum Temperature
4.9.4 Assigning the Switching Output for Recording
4.9.5 Delay for Min./Max. Saving (Charging Level)
4.9.6 Delay for Min./Max. Saving (Temperature)
5 Spares Inventory, Customer Service Addresses
6 Disposal
7 Maintenance and Service
7.1 Breakdowns, Causes and Elimination

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1 Technical Data
Technical Data
Illustration 1
Operating pressure: Max. 1 bar
Operating temperature: -20 °C to +80 °C
Ambient temperature: -20 °C to +70 °C
Weight: approx. 400g
Sealing fluid: Min. 0,8 kg/dm
3
Swimmer: PU
Immersion pipe: MS
G 3/4 flange: MS
Multiplier: Reed chain
Resolution: 10 mm
Temperature sensor: PT100 class B
DIN 60751
Displap and control unit
Display: 4-digit 7-segment LED display
Operation: over 3 keys
Memory: Min. and max. value memory
Current consumption with
starting:
approx. 100 mA for 100 ms
Current consumption during
operation:
approx. 50 mA
Supply voltage (UB): 10-32 V DC (nominal voltage 24 V DC)
Protection: IP 65
Display units: Level:
Temperature:
or
%, cm, L, i, Gal
-20 °C to +120 °C
-4 °F to 248 °F
Setting range: Level:
Temperature:
or
e. g. 0-100 %l
0 °C to +100 °C
32 °F to 212 °F
Accuracy: 1 % of final value
Table 1: Pin assignment
Types NVT-E…-2S NVT-E …-4S
PNP transistor output 2 times 4 times
Analogue output – level --- ---
Analogue output – temperature --- ---
Types NVT-E …-2S-KN-KT NVT-E …-4S-KN-KT
PNP transistor output 2 times 4 times
Analogue output – level 1 time 1 time
Analogue output – temperature 1 time 1 time

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2 Hints
2.1 General Hints
Please read through these mounting instructions carefully before you set the level and temperature control into
operation.
The mounting instructions are part of your product. Please keep them carefully and close to the level and
temperature control.
2.2 Safety and Advice Hints
STOP
DANGER! Dangerofinjurytopersons.
! CAUTION! Damagesonthemachinepossible.
A TT EN TI O N ! Pointing to important items.
2.3 General Hints to Danger
STOP
DANGER!
With assembly, operation and maintenance of the level and temperature control it has to be
made sure that the entire drive train is protected against unintentional engagement. You can
be seriously hurt by rotating parts. Please make absolutely sure to read through and
observe the following safety instructions.
All operations on and with the NVT-E have to be performed taking into account "safety first".
Please make sure to disengage the power pack before you perform your work on the NVT-E.
Protect the power pack against unintentional engagement, e. g. by providing hints at the place of engagement
or removing the fuse for current supply.
Do not touch the operation area of the machine as long as it is in operation.
Please protect the rotating drive components against unintentional touch. Please provide for the necessary
protection devices and caps.
2.4 Proper Use
You may only assemble, operate and maintain the NVT-E if you
carefully read through the mounting instructions and understood them
had technical training
are authorized to do so by your company
The NVT-E may only be used in accordance with the technical data (see chapter 1). Unauthorized modifications
on the NVT-E design are not admissible. We do not take any warranty for resulting damages. To further develop
the product we reserve the right for technical modifications.
The level and temperature control (NVT-E) described in here corresponds to the technical status at the time of
printing of these mounting instructions.

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3 Assembly
The level switches are supplied fully assembled and can be fixed to the tank by means of the thread. In this
context please make sure that the float can move freely and sufficient distance to the tank walls and to other
equipment is kept. If the float has potentially been disassembled it has to be made sure that the magnet inside the
float is situated above the fluid level. This can easily be inspected by means of a piece of iron which allows to find
out the position of the magnet in the float.
3.1 Starting (General)
!
CAUTION!
The electric connection may be performed by trained technical staff only.
Connection
The mains voltage is connected to connector S6 or M12, respectively. Nominal voltage of devices is 24 V DC.
Please refer to the mounting dimensions and pin assignment in the chapter 1 Technical Data.
The switching outputs are designed as PNP transistor outputs
(see illustration 2).
Illustration 2
ATTENTION!
If the switching output is measured with high-impedance
measuring equipment or if the frequency output is used,
connect a 10 kresistor between output and ground to
avoid faulty measurements.
4 Operation
4.1 Switching On
If an error message occurs during normal operation, please refer to chapter
7.1 Breakdowns, Causes and Elimination.
After connecting the device to the mains, the software version is displayed for
a short time. Afterwards, the measured values are displayed.
The functions of the display- and control unit are explained in the following
chapters.
Illustration 3

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4 Operation
4.2 LED-Status Display
Light emitting diodes above the reading indicate the switching status of the outputs. The LEDs are assigned to the
switching output numbered the same.
ATTENTION!
The table 2 shows the factory settings as level or temperature output.
Table 2: LED-Status display
LED-Display 2 switching outputs 4 switching outputs
LED 1 – yellow
indicates switching output 1 Level Level
LED 2 – red
indicates switching output 2 Temperature Level
LED 3 – yellow
indicates switching output 3 --- Temperature
LED 4 – red
indicates switching output 4 --- Temperature
ATTENTION!
The switching behavior of the LED (ON with closed or opened switching output) can be
changed, please note chapter 4.7 switching outputs.
4.3 Key Functions
Operation is performed via the keys underneath the display.
Table 3: Key functions
Key Operation mode Function

- Measured value display: Switching the displayed units (example):
()
- Within the menu: Switching to a submenu
- At the end of the menu: Switching to a superordinate menu
(Exit) indicates the end of the menu
- After input/selection: Accepting and saving a value entered or a feature
selection

- Measured value display: Displaying the configuration
- Within the menu: Scrolling up the menu item, value or feature selection.
Holding the key changes the value continuously.

- Measured value display: Switching to the main menu
- Within the menu: Scrolling down the menu item, value or feature selection.
Holding the key changes the value continuously.
+ * - Within the menu: Exiting the main, sub or optional menu and returning to
measured value display
+ * - Within the menu: Switching to the superior menu level
60 s no action * - Within the menu: Exiting the main, sub or optional menu
* The values that were modified are not stored if you exit the optional or setting menu.
ATTENTION!
A detailed explanation of the menu control is listed in the following chapters.

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4 Operation
4.3 Key Functions
To select a menu item and set the values please proceed as follows:
Open the main menu via the key .
Select the submenu via the keys and and open the submenu via the key .
If applicable, select the next submenu via the keys and and open it using the key .
Select the requested menu item via the keys and and open the parameter list via the key .
Set the value using the keys and and accept via the key .
The amended settings are saved and the device returns to the submenu.
Exit the submenu by selecting menu item EXIT and press key to accept.
The device returns to the superordinate menu or measured value display, respectively.
4.4 Key Lock Active
If the key lock is activated, retrieving the menu via key shows the display
instead of the main menu. The active digit is indicated by a dot.
Enter the code via the keys and and press the key to accept.
The active digit shifts to the right by one place. Having entered the 3rd digit the main menu is opened.
ATTENTION!
Having entered an incorrect code, the device returns to measured value display. If you have
lost the password, enter the master code 287 to return to the menu.
To unlock the key lock, reset the password to the input 000 in the menu item in the sub-menu Basic
Settings Extended Functions .
4.5 Summary of Menu
The menu structure is based on the VDMA standard 24574 and following.
The menu has a hierarchy structure. The highest menu level includes input of the main menu, e. g. ,
, , , . Each main menu comprises further submenu items.
The menu items may vary depending on the configuration of the device. Your device may not provide all menu
items described below. You can retrieve the configuration by pressing the key in the display mode. A 4-digit
code is displayed, e. g.:
Meaning of the 4-digit code tsav:
t: Type
s: number of switching outputs
a: number of analogue outputs
v: mounting of device
t = temperature measurement
o = level and temperature measurement
2 or 4
0 or 2
i = standard mounting (installation of
tank)

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4 Operation
4.5 Summary of Menu
The different menu items are not displayed if the option is
not available.
Example: With a=0 the menu items for setting the
analogue output are not available. In this case
you may skip the description of these items.
The structure of the main menu charging level ()and
temperature ( ) are identical. These menus include all
settings for the switching outputs or the analogue outputs
(if available).
The basic settings of the device may be changed. General
settings are set in the menu Basic settings extended
functions ( ). These settings should be performed first,
since they affect displays and settings in the different
menus. General settings are, for example, the units used
and the classification of the switching outputs for
measurement of charging level and temperature. The
classification of the analogue outputs cannot be changed.
In addition the menu Diagnostics provides options of
diagnostics.
Illustration 4
ATTENTION!
A detailed explanation of the overall menu structure is shown at the end of these
operating/assembly instructions.
4.6 Amendment of Basic Settings
The menu Basic settings extended functions ( ) comprises general basic settings. These settings affect
the display of values in the measured value display as well as the options of settings in the menus charging level
and temperature. It is possible to change the assignment of switching outputs for measurement of charging level
and temperature (if available), too.
Press the key to open the main menu.
Select the menu item via the keys and and open the menu via the key .

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4 Operation
4.6 Amendment of Basic Settings
4.6.1 Defining Charging Level
In this menu the displayed unit symbol for the charging level is defined.
Optional settings:
[,, ,
, , ]
The following menu items are available:
Per cent cm Inch Litre Gallons None
Please note:
If „no unit“ is selected, the measured values are scaled to a 4-digit display.
The measured values are not automatically converted. Having converted the unit
the measurement range should be scaled, if necessary (see menu charging level
and ).
4.6.2 Defining Temperature
In this menu the displayed unit symbol for temperature is defined.
The following menu items are available:
Degrees Celsius Degrees Fahrenheit
Please note:
If changing the setting, all corresponding settings such as setting of switching
points are amended accordingly.

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4 Operation
4.6 Amendment of Basic Settings
4.6.3 Re-assignment of Switching Outputs
The amendment of assignment of the switching outputs is described here based on the example of switching
output 1.
The switching outputs 1 to n can be assigned optionally to the measuring size charging level or temperature. The
assignment affects the appearance of the menu charging level and temperature . In the factory
setting the switching output OUT 1 is assigned to the charging level.
Example: OUT 1 shall be assigned to temperature. For that purpose must be set to . As a
result the setting menu is shifted from the menu charging level to the menu temperature. The
procedure for amending the settings does not change.
ATTENTION!
With a re-assignment of the switching outputs all corresponding settings have to be
verified. The figures set before are not automatically adapted. The assignment of LEDs for
status display does not change.
The following menu items are available:
Measurement of charging level Measurement of temperature
ATTENTION!
The other switching outputs for measurement of charging level of temperature are assigned
in the same way as switching output 1.
Perform the same steps as described for switching output OUT 1.
4.6.4 Setting Updating Rate of Display
Depending on the application the updating rate of the dispay can be set. The display can be fully switched off as
well. The function of LED continues to be existing.
The following menu items are available:
fast medium slow display off
Please note:
Problem reports continue to be indicated in spite of the display being switched off.

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4 Operation
4.6 Amendment of Basic Settings
4.6.5 Activating/Deactivating Key Lock
To prevent unauthorized modifications of settings on the device, it is possible to activate a key lock.
The key lock is activated if at least one digit is set > 0. While entering the data the active digit is marked with a
dot.
Open the parameter menu by pressing the key :
Set the digit via the keys and (0 to 9) and accept by pressing the key .
The active digit shifts to the right by one place.
Finally accept the code by pressing the key .
The device returns to the submenu.
Please note:
Enter 000 to deactivate the key lock.
4.6.6 Scaling of Charging Level
Scaling of the display range is effected between the highest and
the lowest level of the float. The display accuracy and the
resolution for defining the switching outputs for the charging
level are affected by this scaling, too.
The factory setting of the switching point and the display is
shown in illustration 5:
A: Factory settings
1: Measuring range
A: Types with analogue output:
The factory setting provides for an ascending display with
the charging level being ascending so that 0 % are
displayed with the lowest possible point and 100 % with the
highest possible point. These values can be modified as
described below.
Illustration 5

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4 Operation
4.6 Amendment of Basic Settings
4.6.7 Maximum Displayed Value of Charging Level
The displayed value (upper limit of the measurement range) for the maxium charging level is defined here.
Setting range:
-999…9999
Assignment of the maximum displayed value (upper limit of the measurement
range) towards the maximum charging level
Please note:
To prevent misoperation, the settings of the level outputs should be reviewed or
adapted after changing.
4.6.8 Minimum Displayed Value of Charging Level
The displayed value (lower limit of the measurement range) for the minimum charging level is defined here.
Setting range:
-999…9999
Assignment of the maximum displayed value (upper limit of the measurement
range) towards the maximum charging level
Please note:
To prevent misoperation, the settings of the level outputs should be reviewed or
adapted after changing.
4.6.9 Resetting Factory Settings (Reset)
The function Reset ( ) allows to reset the factory settings. Since the limit values are reset, too, it is not
absolutely necessary to review the settings for the charging level and the temperature.
!
CAUTION!
All modifications are lost when using the function RESET.
The following menu items are available:
Delivery status: NO.
The current settings are kept.
Delivery status: Yes.
The settings are reset to the standard
factory settings.

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4.6 Amendment of Basic Settings
4.6.10 Factory Settings
Definitions of the factory settings set:
x / x Switching point / reset point x
x / x Delay for switching/delay for resetting for switching output x
x. / x. Maximum and minimum measured value for output
x Signal characteristics of analogue output
x Switching characteristics of switching output x
/ Unit for charging level/temperature
/ Maximum / minimum charging level
x Assignment of switching output x towards charging level or temperature monitoring
Updating rate of display
Key lock
Recorded switching output
Delay for recording the minimum/maximum charging level
Delay for recording the minimum/maximum temperature
ATTENTION!
With customized parameters the pre-setting performed by the customers may differ from the
figures mentioned in here.
Table 4: Type with 4 switching outputs
Switching ouptuts Basic settings Diagnostics
/ 5% / 2% -I- (%)
/ / / / °X
/ 15% / 12% %
/ / / / %
/ / °X
/ / / /
/ / °X
/ / / /
Table 5: Type with 2 switching outputs and 2 analogue outputs
Switching outputs Basic settings Diagnostics
/ 5% / 2% -I- (%)
/ / / / °X
/ / °X %
/ / / / %
Analogue outputs
/ / / /
/ / / /

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4 Operation
4.7 Switching Outputs
All switching outputs are set in the same way. Therefore, the number of the switching output is marked x. Select
the switching output to be set via the menu of the corresponding measurement size ( or ).
Table 6: Assignment of switching outputs (factory-provided)
Switching output Assignment with
2 switching outputs Assignment with 4 switching outputs
1 Charging level Charging level
2 Temperature Charging level
3 Temperature
4 Temperature
ATTENTION!
The assignment of the switching outputs as well as further basic settings referring to all
switching outputs can be modified in the menu Basic settings extended functions.
The submenu Extended functions allows to execute further settings for each switching
output affecting, for example, the switching behaviour of the output. Testing the output is
possible here, too.
4.7.1 Definition of Switching Characteristics
The switching characteristics for the output are defined in the following menu:
The following menu items are available:
Hysteresis function
Hysteresis function
make contact
Hysteresis function
break contact
Function of make contact or break contact setting
the output signal when exceeding the switching
point defined. If the reset point is fallen below, the
output signal is deleted.
Make contact means here that the PNP switching
output is closed if the measured value is above the
switching point x and is opened if the reset point
x is fallen below.
Break contact means here that the PNP switching
output is open if the measured value is above the
switching point x and is closed if the reset point
x is fallen below.
See explanations in the drawing below.

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4.7 Switching Outputs
4.7.1 Definition of Switching Characteristics
Window function
Window function
make contact
Window function
break contact
Function of make contact or break contact defining
a signal window. If the measured window is
reached, the output signal is set and deleted once
it is left.
Make contact means here that the PNP switching
output is closed if the measured value is within the
window limits. Otherwise the switching output is
open.
Break contact means here that the PNP switching
output is open if the measured value is within the
window limits. Otherwise the switching output is
closed.
Frequency output
Frequency output
If the output is defined as a frequency output, a
square wave signal with a frequency between
1 Hz and 100 Hz is given proportionately to the
measured value.

ATTENTION!
To increase the slew rate of the square
wave signal, we recommend to load
the switching output with a 10 k
resistance.
ATTENTION!
The switching function may have different descriptions:
Illustration 6


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4.7 Switching Outputs
4.7.2 Upper Switching Limit (Set Point)
The upper switching limit for switching output OUT 1 is set in the following submenu:
Setting range:
[ ] …. [ ]
Switching point for OUT x
Please note:
The switching point must be set within the measuring range (see menu Basic
settings extended functions).
If the function window was assigned to the switching output OUT 1,
is displayed.
The value set corresponds to the upper window limit.
If the function frequency output was assigned to the switching output OUT 1,
is displayed.
The value set corresponds to the frequency 100 Hz.
4.7.3 Lower Switching Limit (Reset Point)
The lower switching limit for switching output OUT 1 is set in the following submenu:
Setting range:
[ ] …. [ ]
Reset point for OUT 1
Please note:
The reset point must be set within the measuring range.
If the function window was assigned to switching output OUT 1, is
displayed.
The value set corresponds to the upper window limit.
If the function frequency output was assigned to the switching output OUT 1,
is displayed.
The value set corresponds to the frequency 1 Hz.

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Verified: 19.11.12 Pz Replaced by:
4 Operation
4.7 Switching Outputs
4.7.4 Delay for Set Point
The menu Extended functions x provides further settings for the switching output x. The submenu is located
on the second submenu level:
The delay time for set point and reset point prevents too many false alarms with turbulent conditions. The delay
for the set point is set in the following menu:
Setting range:
0 .… 100 seconds
Time period in seconds during which the signal must remain continuous to
enable the switching output to respond.
Please note:
If the function window was assigned to the switching output OUT x, the value set
corresponds to the delay for set point detecting when the measurement window is
actually reached.
If the function frequency output was assigned to the switching output OUT x, this
value has no effect.
4.7.5 Delay for Reset Point
The delay for reset point is set in the following menu:
Setting range:
0 .… 100 seconds
Delay for reset signal for OUT x
Time periods in seconds during which the signal must remain continuous to
enable the switching output to respond.
Please note:
If the function window was assigned to the switching output OUT 1, the value set
corresponds to the delay for reset point detecting when the measurement window
is actually left.
If the function frequency output was assigned to the switching output OUT 1, this
value has no effect.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
NVT-E
Operating-/Assembly Instructions
KTR-N
Sheet:
Edition:
42611 EN
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Please note protection
mark ISO 16016.
Drawn: 11.10.12 Pz/Wy Replaced for: ---
Verified: 19.11.12 Pz Replaced by:
4 Operation
4.7 Switching Outputs
4.7.6 Testing the Switching Output
Testing the switching output can be started in the following menu:
Testing options for the switching output
Options for setting from to / / / :
Normal operation of
switching output
Switching off the switching
output permanently
Switching on the switching
output permanently
Options for setting from to
Normal operation as a
frequency output
Output
frequency 1 Hz
Output
frequency 100 Hz
ATTENTION!
Having completed the tests, please make absolutely sure to set the function to normal
operation .
4.7.7 Changing Display Function of Status LED
The switching status of the output is indicated by the LEDs in the display. The assignment of LED to the switching
output is shown in the table below:
Table 7:
Numbering of LED Switching output x Assignment with
2 switching outputs Assignment with 4 switching outputs
1 LED 1 – yellow LED 1 – yellow
2 LED 2 – red LED 2 – red
3 LED 3 – yellow
4 LED 4 – red
In the factory settings the LED indicates the physical condition of the PNP switching output
(switching output closed – LED is illuminated).
In some cases the logical function of the display is to act differently from the physical signal on the switching
output. Therefore, the display in this menu item can also be reverted
(switching output opened – LED is illuminated).
Example based on temperature:
Two switching outputs are available for temperature which are set as follows:
Upper switching contact: maximum contact, ascending make contact. The LED is illuminated when the
maximum value of temperature is exceeded and the temperature is beyond the requested range. Thus, the
status indicated is “error” if the LED is illuminated.
Lower switching contact: minimum contact, ascending break contact. The LED is illuminated with the factory
settings when the minimum value of temperature is exceeded. In this case the LED would be illuminated if the
status is in order.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
NVT-E
Operating-/Assembly Instructions
KTR-N
Sheet:
Edition:
42611 EN
20 of 27
1
Please note protection
mark ISO 16016.
Drawn: 11.10.12 Pz/Wy Replaced for: ---
Verified: 19.11.12 Pz Replaced by:
4 Operation
4.7 Switching Outputs
4.7.7 Changing Display Function of Status LED
The table shows an example with factory settings and with inverted status function for LED3.
The switching points are defined as follows:
= 70 °C, = 65 °C
= 80 °C, = 75 °C
Table 8:
Factory settings Status function
LED3 inverted Situation Status
A Temperature rising to > 70 °C
PNP switching output 3 is closed OK
LED3 on LED3 off
B
Temperature rising to > 80 °C
PNP switching output 4 is closed Error
LED4 and LED3 on only LED4 on
C Temperature dropping to < 75 °C
PNP switching output 4 is opened OK
LED3 on LED3 off
D Temperature dropping to < 65 °C
PNP switching output 3 is opened Error
LED3 off LED3 on
Here you can invert the status function of LED for a contact: the LED is illuminated if the contact is opened, thus
falls below the minimum temperature, and when the LED is illuminated the status „error“ is indicated. Especially
the recording of incidents depends on the illumination of LED (see chapter 4.9 Diagnostics, ).
The following menu items are available:
LED = output;
the LED is illuminated if the PNP
switching output is closed.
LED = -output;
the LED is illuminated if the PNP
output is opened.
Please note:
The recording of incidents specifically depends on the illumination of the LED (see
chapter 4.9 Diagnosis, ).