Bühler technologies Nivovent NV 77-XP User manual

Fluidcontrol
Installation and Operation Instructions
Original instructions
Level- and temperature sensor
Nivotemp NT 67-XP, Nivovent NV 77-XP
BE100016
02/2018
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. [phone] / 49 89-0, Fax: [phone] / 49 89-20
E-Mail: [email protected]
Internet: www.buehler-technologies.com

Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. [phone] / 49 89-0, Fax: [phone] / 49 89-20
Internet: www.buehler-technologies.com
E-Mail: [email protected]
Read this instruction carefully prior to installation and/or use. Pay at-
tention particularly to all advises and safety instructions to prevent in-
juries. Bühler Technologies can not be held responsible for misusing
the product or unreliable function due to unauthorised modifications.
All rights reserved. Bühler Technologies GmbH 2018
Document information
Document No.......................................................... BE100016
Version......................................................................... 02/2018

Nivotemp NT 67-XP, Nivovent NV 77-XP
Contents
1 Introduction..................................................................................................................................................................................................................... 3
1.1 Intended Use......................................................................................................................................................................................................... 3
1.2 Functionality......................................................................................................................................................................................................... 3
1.2.1 Liquid level monitoring ......................................................................................................................................................................3
1.2.2 Temperature monitor .........................................................................................................................................................................3
1.3 Design types.......................................................................................................................................................................................................... 3
1.4 Model key NT67-XP .............................................................................................................................................................................................4
1.5 Model key NV77-XP .............................................................................................................................................................................................4
1.6 Scope of Delivery.................................................................................................................................................................................................. 5
2 Safety instructions.........................................................................................................................................................................................................6
2.1 Important advice.................................................................................................................................................................................................6
2.2 General hazard warnings ................................................................................................................................................................................. 7
3 Transport and storage ..................................................................................................................................................................................................8
4 Setup and connection...................................................................................................................................................................................................9
4.1 Installation ............................................................................................................................................................................................................9
4.2 Electrical connections ........................................................................................................................................................................................9
5 Operation and control ................................................................................................................................................................................................ 10
5.1 Start-up procedure ...........................................................................................................................................................................................10
5.2 LED statuses ........................................................................................................................................................................................................ 10
5.3 General key functions ....................................................................................................................................................................................... 11
5.4 Keylock enabled .................................................................................................................................................................................................. 11
5.5 Menu overview .................................................................................................................................................................................................. 12
5.6 Changing basic settings ...................................................................................................................................................................................13
5.6.1 Disabling normal error handling................................................................................................................................................... 13
5.6.2 Set liquid level unit ............................................................................................................................................................................ 13
5.6.3 Set temperature unit.........................................................................................................................................................................14
5.6.4 Define switching outputs ................................................................................................................................................................14
5.6.5 Reallocate switching outputs .........................................................................................................................................................14
5.6.6 Set display refresh rate ..................................................................................................................................................................... 15
5.6.7 Enable/disable keylock...................................................................................................................................................................... 15
5.6.8 Liquid level scaling .............................................................................................................................................................................16
5.6.9 Assigning the upper limit of the sensor measuring range....................................................................................................16
5.6.10 Sensor measuring range lower limit assignment .................................................................................................................... 17
5.6.11 Restore factory settings (Reset)...................................................................................................................................................... 17
5.7 Switching outputs............................................................................................................................................................................................. 19
5.7.1 Switching output x: Definition of the switching characteristic...........................................................................................19
5.7.2 Switching output x: Upper switching limit (switching point).............................................................................................20
5.7.3 Switching output x: Lower switching limit (switch-back point) .......................................................................................... 21
5.7.4 Switching output x: Switch-on delay ........................................................................................................................................... 21
5.7.5 Switching output x: Switch-back delay ....................................................................................................................................... 21
5.7.6 Switching output x: Testing the switching output ................................................................................................................. 22
5.7.7 Change status LED display function ............................................................................................................................................ 22
5.8 Analogue outputs .............................................................................................................................................................................................23
5.8.1 Analogue output x: Assigning the upper limit..........................................................................................................................23
5.8.2 Analogue output x: Lower limit assignment ............................................................................................................................ 24
5.8.3 Analogue output x: Signal type assignment............................................................................................................................. 24
5.8.4 Analogue output x: Testing the analogue output ...................................................................................................................25
5.9 Diagnostic options ............................................................................................................................................................................................25
5.9.1 View logbook........................................................................................................................................................................................25
5.9.2 Maximum and minimum liquid level......................................................................................................................................... 26
5.9.3 Maximum and minimum temperature ..................................................................................................................................... 26
5.9.4 Define switching output to log ......................................................................................................................................................27
5.9.5 Delay for storing the Min/Max Liquid Level ...............................................................................................................................27
5.9.6 Delay for storing the Min/Max Temperature ............................................................................................................................27
6 Cleaning and Maintenance.......................................................................................................................................................................................28
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6.1 Replacing the filter element...........................................................................................................................................................................28
6.2 Adding small amounts of oil..........................................................................................................................................................................28
7 Service and repair.........................................................................................................................................................................................................29
7.1 Troubleshooting ................................................................................................................................................................................................29
7.2 Spare parts and accessories ...........................................................................................................................................................................30
8 Disposal............................................................................................................................................................................................................................31
9 Appendices..................................................................................................................................................................................................................... 32
9.1 Technical Data NT 67-XP..................................................................................................................................................................................32
9.2 Technical Data NV 77-XP..................................................................................................................................................................................34
9.3 Dimensions NT 67-XP .......................................................................................................................................................................................36
9.4 Dimensions NV 77-XP ....................................................................................................................................................................................... 37
9.5 Standard pin assignment NT 67-XP .............................................................................................................................................................38
9.6 Standard pin assignment NV 77-XP.............................................................................................................................................................38
9.7 Current settings................................................................................................................................................................................................ 40
9.8 Display ranges................................................................................................................................................................................................... 40
9.9 Display resolution ............................................................................................................................................................................................. 41
9.10 Menu Sequence Overview ..............................................................................................................................................................................42
10 Attached documents...................................................................................................................................................................................................43
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1 Introduction
1.1 Intended Use
Level switches are used to monitor the liquid level and temperature in fluid systems.
Level switches must not be used in highly flammable or corrosive liquids.
The medium must not contain particles, particularly metallic particles, to prevent deposits on the float or between the float and
switching tube. If necessary, filter the medium.
Please note the technical data in the appendix for the specific intended use, existing material combinations, as well as temper-
ature limits.
WARNING
All device models are solely intended for industrial applications. They are not safety com-
ponents. The devices must not be used if failure or malfunction thereof jeopardises the
safety and health of persons.
Use in explosive areas is prohibited.
1.2 Functionality
1.2.1 Liquid level monitoring
The measuring tube is located inside the tank. The reed-contact is located inside the measuring tube.
Simply put, the reed-contact works the same as a regular resistance potentiometer. The reed-contact consists of a number of
reed switches along with resistors connected in series. The total length of the chain varies by the path being monitored.
If a magnet inside a float trips the reed switch, a resistance signal proportional to the position of the float will be output. When
the float changes positions, resistances are more or less activated and the resistance signal altered based on the position of the
float. The resistance signal passes through a transformer yet and is analysed by the display unit.
1.2.2 Temperature monitor
Temperature is monitored via temperature sensor (Pt100) inside the sensor tube. Depending on the version, there are several
switching outputs combined with one analogue output (4 - 20mA). The temperature is shown in the display.
Please note the technical data in the appendix.
1.3 Design types
The level switch is equipped with different switching and analogue outputs based on the configuration. The outputs are freely
programmable.
The Nivovent type can be equipped with the following options:
VS Optical contamination indicator for the vent filter: analogue negative pressure display, display range 0.35 bar (5.1 PSI).
BFA* Filling adapter incl. ribbed flange with screen insert: This option enables adding small amounts of oil through the vent
filter housing. The selected version is built into the respective housing for this purpose.
SSR* Stilling tube with centring disc and filling adapter: Just as with the BFA, this contains both the stilling tube option as
well as the filler. The stilling tube is made from the same material as the selected immersion tube (MS/VA).
MT for installation into the multiterminal: Here the basic version is built into the multiterminal (MT).
MTS for installation into the multiterminal including stilling tube: In addition to the basic version, a stilling tube with cent-
ring disc is built into the multiterminal.
FCT Fluidcontrolterminal: Here the fluid control terminal (FCT) is mounted directly onto the basic version.
* not in conjunction with FCT and MT/MTS option
The SSR option is available for the Nivotemp type.
Please refer to the type plate for your equipment configuration. In addition to the job number, this also contains the item num-
ber and type designation.
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1.4 Model key NT67-XP
NT67-XP-
2M12 - 4-pin
M12 - 4-pin
M12 - 8-pin
2M12 - 1 x 4-pin, 1 x 8-pin
Brass
Float and immersion tube VA
MS
VA
Version
280
370
500
670
820
970
1120
1270
1420
4 x PNP switching output
Output card
2S-KN-KT
4S
2 x PNP switching output
1 x analogue level output
1 x analogue temperature output
4 x PNP switching output
1 x analogue level output
1 x analogue temperature output
4S-KN-KT
Option
SSR Stilling tube
for version 1D1S only
for version 4S-KN_KT and 6S only
for version 6S-KN-KT only
Type designation with display, control
unit
Plug connection
Length (max. 1420 mm)
4 x PNP switching output
1 x analogue level output
1 x analogue temperature output
6 x PNP switching output
6S
6S-KN-KT
1)
2)
3)
1)
3)
----
-
1 x IO-Link
1 x PNP switching output
1D1S
2)
1.5 Model key NV77-XP
NV 77-XP-HY-5-
= 5 mm
Resolution
5
2M12 - 4-pin
M12 - 4-pin
M12 - 8-pin
S6
2M12 - 1 x 4-pin, 1 x 8-pin
Brass
Float and immersion tube VA
MS
VA
Version
280
370
500
670
820
970
1120
1270
1420
4 x PNP switching output
Output card
2S-KN-KT
4S
2 x PNP switching output
1 x analogue level output
1 x analogue temperature output
6 x PNP switching output
1 x analogue level output
1 x analogue temperature output
6S-KN-KT
Options
VS Contamination indicator
BFA
SSR
FCT
MT
MTS
Filling adapter
Stilling tube with
filling adapter
Fluidcontrolterminal
for multiterminal
for multitermminal incl.
stilling tube
Not in conjunction with FCT option
1D1S version only
4S-KN-KT version only
6S-KN-KT version only
Not in conjunction with option FCT, MT and MTS
Type designation with display,
control unit, HY filter
Plug connection*
Length (max. 1420 mm)
4 x PNP switching output
1 x analogue level output
1 x analogue temperature output
4S-KN-KT
6 x PNP switching output
6S
5)
5)
4)
3)
1)
* Other plug connections available upon request
- - - --
1D1S
1 x IO-Link
1 x PNP switching output
2)
1)
2)
3)
4)
5)
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1.6 Scope of Delivery
– Level switch
– Product documentation
– Connection/mounting accessories (optional)
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2 Safety instructions
2.1 Important advice
Operation of the device is only valid if:
– the product is used under the conditions described in the installation- and operation instruction, the intended application
according to the type plate and the intended use. In case of unauthorized modifications done by the user Bühler Technolo-
gies GmbH can not be held responsible for any damage,
– when complying with the specifications and markings on the nameplates.
– the performance limits given in the datasheets and in the installation- and operation instruction are obeyed,
– monitoring devices and safety devices are installed properly,
– service and repair is carried out by Bühler Technologies GmbH,
– only original spare parts are used.
This manual is part of the equipment. The manufacturer keeps the right to modify specifications without advanced notice. Keep
this manual for later use.
Signal words for warnings
DANGER
Signal word for an imminent danger with high risk, resulting in severe injuries or death if not avoided.
WARNING
Signal word for a hazardous situation with medium risk, possibly resulting in severe injuries or death if not
avoided.
CAUTION
Signal word for a hazardous situation with low risk, resulting in damaged to the device or the property or
minor or medium injuries if not avoided.
NOTICE
Signal word for important information to the product.
Warning signs
These instructions use the following warning signs:
Warns of a general hazard Unplug from mains
Voltage warning Wear respiratory equipment
Warns not to inhale toxic gasses Wear a safety mask
Warns of corrosive liquids Wear gloves
General information
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2.2 General hazard warnings
The equipment must be installed by a professional familiar with the safety requirements and risks.
Be sure to observe the safety regulations and generally applicable rules of technology relevant for the installation site. Prevent
malfunctions and avoid personal injuries and property damage.
The operator of the system must ensure:
– Safety notices and operating instructions are available and observed,
– The respective national accident prevention regulations are observed,
– The permissible data and operational conditions are maintained,
– Safety guards are used and mandatory maintenance is performed,
– Legal regulations are observed during disposal.
Maintenance, Repair
Please note during maintenance and repairs:
– Repairs to the unit must be performed by Bühler authorised personnel.
– Only perform conversion-, maintenance or installation work described in these operating and installation instructions.
– Always use genuine spare parts.
Always observe the applicable safety and operating regulations in the respective country of use when performing any type of
maintenance.
The method for cleaning the devices must be adapted to the IP protection class of the devices. Do not use cleaners which could
damage the device materials.
DANGER Toxic, acidic gases/liquids
Protect yourself from toxic, corrosive gasses/liquids when performing any type of work.
Wear appropriate protective equipment.
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3 Transport and storage
Only transport the product inside the original packaging or a suitable alternative.
The equipment must be protected from moisture and heat when not in use. It must be stored in a covered, dry, dust-free room
at room temperature.
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4 Setup and connection
DANGER Electric voltage
Risk of electric shock
a) Always disconnect the unit from the mains before performing work.
b) Secure the equipment from accidental restarting.
c) The equipment may only be installed, maintained and put into operation by instruc-
ted, competent personnel.
d) Always observe the applicable safety regulations for the operating site.
DANGER Toxic, acidic gases/liquids
Protect yourself from toxic, corrosive gasses/liquids when performing any type of work.
Wear appropriate protective equipment.
4.1 Installation
For direct installation to the tank, insert the switching tube into the designated bore (per DIN 24557, Part 2) with rubberised cork
seal on the tank. It secures to the flange using the included screws and seals. Please be sure the float can move freely and to
leave enough space between the tank wall and add-ons.
After removing the float, where applicable, be sure the magnet inside the float is above the fluid level. This can easily be verified
with a piece of iron to determine the magnet position inside the float.
DANGER Electric voltage
Risk of electric shock
When connecting devices, please note the maximum voltages and currents currents (see
technical data) and use the correct wire cross-sections and circuit breakers.
When selecting the connection lines, also note the maximum operating temperatures of
the devices.
Installation in special areas of application:
If the device will be installed outdoors or in wet areas, the maximum operating voltage
is max. 16 V DC effective or 35 V DC.
The flange-mounted display units can be swivelled vertically by approx. 270° so they are easier to read. Please note the built-in
swivel stop. You will notice more resistance when reaching the stop. Turning it beyond this stop may damage the display unit.
4.2 Electrical connections
Electricity is supplied via plug connectors. Please refer to the appendix for installation dimensions, nominal voltage and plug
configuration.
The temperature switching outputs are PNP transistors (see illustration):
Supply voltage
Note: When measuring the switching output with high-load measuring device inputs or when used as a frequency output, the
load must be set to 10 kΩ between the output and earth (GND) to avoid faulty measurements.
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5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
5.1 Start-up procedure
The device will automatically switch on when connected to power. It will first briefly display the software version, at which time
the device will also check the built-in components. The display will then switch to displaying measurements.
The following describes the function of the display and control unit:
LEDs
Control keys
Display
If an error message appears in the display during operation, please refer to the Troubleshooting table under chapter “Service
and Repair”.
5.2 LED statuses
LEDs above the measurement display indicate the status of the switching outputs. The LEDs are permanently assigned to the
switching outputs.
The following table lists the factory settings for the liquid level and temperature switching output configuration:
2 Switching
outputs
4 Switching
outputs
6 Switching
outputs
LED 1 – yellow
Status switching output 1
Liquid Level Liquid Level Liquid Level
LED 2 - red
Status switching output 2
Temperature Liquid Level Liquid Level
LED 3 – yellow
Status switching output 3
--- Temperature Liquid Level
LED 4 – red
Status switching output 4
--- Temperature Temperature
LED 5 – yellow
Status switching output 5
--- --- Temperature
LED 6 – red
Status switching output 6
--- --- Temperature
The switching characteristics of the LED (on if switching contact closed or open) can be changed.
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5.3 General key functions
The keys below the display are used for operation.
The menu controls are detailed in the following chapters.
Key Mode Function
– Measurement display: Change measured variables displayed.
– In the menu: Move down one menu level.
Move up one menu level.
– At the end of the menu:
The display indicates the end of the menu.
– Following input/selection: Confirm and save a numerical value entered or a function selection. The dis-
play will flash if a parameter has been changed.
– Measurement display: Displays the configuration.
– In the menu: Scroll up menu item, numerical value or function selection. Holding the key
will continuously scroll.
– Measurement display: Go to main menu.
– In the menu: Scroll down menu item, numerical value or function selection. Holding the key
will continuously scroll.
+ – In the menu: Exit the main / sub / drop-down menu and return to displaying the measure-
ment without saving changes to the parameters.
+ – In the menu: Move to the next higher menu level.
60 s no action – In the menu: Exit the main / sub/ drop-down menu.
To select a menu item and to enter values:
– Open the main menu with the key.
– Select the submenu with the and keys and open the submenu with the key.
– If necessary, select the next submenu with the and keys and open with the key.
– Select the desired menu item with the and keys and open the list of values with the key.
– Set the value with the and keys and confirm with the key. The new settings will the saved and the device will return
to the submenu.
– Select the menu item EXIT to exit the submenu and confirm with the key. The device will return to the next menu level up
or to the measurement display.
5.4 Keylock enabled
With the keylock enabled, selecting the menu with the key will display in place of the main menu. The active
digit will be indicated by a dot.
– Use the and keys to enter the code and confirm with the key. The active digit will move one place to the right. After
entering the 3rd digit the main menu will open.
If the wrong code is entered, the device will return to the measurement display. If you forgot the password you can always enter
master code 287 to access the menu.
You can cancel the keylock under Loc in submenu Basic Settings Advanced Options b.EF and enter 000 to reset the code.
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5.5 Menu overview
The menu structure is based on the VDMA standard sheet 24574-1. The menu structure is hierarchic. The top menu level contains
the main menu items, e.g. oil, tEMP, b.EF, diA, E. Each main menu contains additional submenu items.
The menu items may vary depending on the device configuration. Not all menu items described below will necessarily apply to
your device. Press the key in display mode to open the configuration. A 4-digit code will appear, e.g.
With the 4 digits tsav meaning:
t: Model
s: Number of switching outputs
a: Number of analogue outputs
v: Device installation type
o = level and temperature measurement
2, 4 or 6
0 for 2
i = standard installation (tank installation)
Configuration
Equipment configuration
o___i
____
oiI
Display
Measurement display
Level
Liquid Level main menu
out1
Settings menu OUT1
Out 1
out_
Settings menu OUTX
Out X
An 1
Settings menu Analog 1
Analog Out 1
E
Exit menu level
Exit
out_
Settings menu OUTX
Out X
out_
Settings menu OUTX
Out X
An 2
Settings menu Analog 2
Analog Out 2
E
Exit menu level
Exit
tEMP
Temperature main menu
Temperature
b.EF
Basic Adv. Functions
Basic EF
If applicable
If applicable
If applicable
If applicable
If applicable
DiA
Diagnostics menu
Diagnostic
E
Exit menu level
Exit
____ ____
Toggle display
Toggle
The individual menu items will not be shown if the option does not apply. Example: With a=0 the menu items for configuring
the analogue output does not apply. You can then skip the description for this item.
The structure of main menu Liquid Level (oil) and temperature (tEMP) is identical. Here you can configure the switching out-
puts or the analogue outputs (if applicable).
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The basic device settings can be changed. General settings can be configured under Basic Settings Advanced Functions (b.EF).
These settings should be configured first, as they affect the displays and settings for the individual menus. These settings are
e.g. the units used and allocating switching outputs for liquid level and temperature measurement. The allocation of the ana-
logue outputs cannot be changed.
The Diagnostic (dia) menu further contains diagnostics options.
For the detailed illustration of the entire menu structure please refer to the original operating instructions at the end of this
chapter.
5.6 Changing basic settings
The general basic settings can be changed under menu Basic Settings Extended Functions (bEF). These settings will affect the
measurement display and the configuration options in the various main menus. Here you can also change the switching output
assignment.
– Press the key to open the main menu.
– Select menu item (EF) using the and keys and open the menu with the key.
NOTICE Disabling normal error handling
Disabling normal error handling and analysis could potentially cause dangerous operat-
ing states, dangers to the user or machines. Before using this option, review the hazard
potential within the process. With this setting, Bühler Technologies GmbH assumes no li-
ability for injuries to health or material damage caused by this setting.
5.6.1 Disabling normal error handling
Here you can enable/disable normal error handling and analysis
The function Disable error handling (Err.h) is used to disable normal error handling and analysis. This may pose dangers to the
user or machine.
Basic EF b.EF
Basic ext. functions
Err.h
Disable error handling
Set error handling ___
no - YES
Confirm
The options are:
Disables normal error handling. Enables normal error handling (default)
Important note: When exceeding the measuring range or if sensor errors occur, the measurement
will be frozen and all six LEDs in the status bar will blink. When the measurement returns to the
permissible range the LEDs will stop blinking and the display will refresh again as usual.
5.6.2 Set liquid level unit
Used to set the unit symbol for the liquid level:
Basic EF b.EF
Basic Adv. Functions
o.uni
Liquid Level unit
Set Unit Level ___
-I - - non
Selection menu
Options:
[-1-, cn, in, Lit, CAL, non]
The options are:
Percent cm inch Litre Gallons none
Note:
– When non "no unit" is selected, the display will scale measurements to a four-digit output.
– Measurements are not automatically converted. After switching the unit (if necessary), the
measuring range should be scaled (see menu Liquid Level o.Hi and o.Lo).
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5.6.3 Set temperature unit
This is where the unit symbol for the temperature is configured:
Basic EF b.EF
Basic Adv. Functions
t.uni
Temperature unit
Set Unit Temp ;_
;C - ;F
Selection menu
The options are:
Degrees
Celsius
Degrees
Fahrenheit
Note:
– Values are automatically converted and the measuring range adjusted. However, always check
the respective switching points and switch-back points.
5.6.4 Define switching outputs
Here you can define the switching outputs.
Use the “Define switching outputs” function to define the switching outputs (r.ou1 and r.ou2). The switching outputs can be
configured as Err, oil and tEMP .
Basic EF b.EF
Basic Adv. Functions
r.ou1/2
Define switching outputs
SET Output ____
Err - oil - tEMP
Selection menu
Options:
[Err, oil, tEMP]
The options are:
Err oil TEMP
Note:
– Switching outputs 1 and 2 can alternatively be wired as error indicators. In this case the output
will be connected as a NC contact which opens when exceeding the range or if an error occurs.
The LED assigned to this output will generally not be activated, as all 6 LED's in the status bar
will blink if an error occurs.
– When defining a switching output as an error indicator it will no longer be an option for normal
switching output settings.
5.6.5 Reallocate switching outputs
This describes how to change the allocation of switching outputs for switching output1. This procedure also applies to all other
switching outputs.
Basic EF b.EF
Basic Adv. Functions
r.ou_
Assignment Out X
reassign OX ____
oil - tEMP
Selection menu
Switching outputs 1 to n can be freely allocated to the measured variable liquid level or temperature. The allocation affects the
appearance of the liquid level oil and temperature tEMP menus. The factory setting allocates switching output OUT1 to the li-
quid level.
Example: OUT 1 is to be allocated to the temperature. In this case, r.ou1 must be set to tEMP. This will switch the settings menu
out1 from Liquid Level menu to the Temperature menu. The procedure for changing the settings does not change.
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NOTICE Reallocate switching outputs
When reallocating the switching outputs always check all the related settings! The previ-
ous values will not automatically be adjusted! It does not affect allocation of the status
display LEDs.
The options are:
Level measurement Temperature measurement
Use the same procedure as for switching output 1 to allocate the other switching outputs for measuring the liquid level or tem-
perature.
– Use the same steps specified for switching output OUT1.
5.6.6 Set display refresh rate
The refresh rate of the display can be changed based on the application. The display can also be completely disabled. The LEDs
will remain functional.
Basic EF b.EF
Basic Adv. Functions
Di5
Display rate
Display Rate ____
FASt - oFF
Selection menu
The options are:
fast medium slow Display off
Note:
– Error messages will still appear, even with the display off.
5.6.7 Enable/disable keylock
The keylock can be enabled to prevent unauthorised changes to the device settings.
Basic EF b.EF
Basic Adv. Functions
Lock
Locks the keys
Lock Device ___
0 - 999
Selection menu
The keylock will be enabled after entering at least one digit > 0. A dot indicates the active digit during this input.
Setting range:
000 to 999
– Use the key to open the list of values:
– Enter the digit using the and keys (0 to 9) and press the key to confirm. The active digit
will move one place to the right.
– Lastly, press the key to confirm the code.
The device will now return to the submenu.
Note:
– To disable the keylock enter: 000
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Nivotemp NT 67-XP, Nivovent NV 77-XP
5.6.8 Liquid level scaling
The display range is scaled between the highest and lowest float position. This scaling will also affect the display accuracy and
the resolution for determining the switching outputs for the liquid level.
The following illustration shows the factory setting for the switching outputs and the display:
A = factory settings
1 = measuring range
Models with analogue output:
The factory setting for the display is in descending order for increasing liquid level, so the bottom position shows 0% and the
top position shows 100%. The values can be switched as described below.
5.6.9 Assigning the upper limit of the sensor measuring range
This determines the display value (upper limit for the measuring range) for the maximum liquid level:
Basic EF b.EF
Basic Adv. Functions
o.Hi
Assign 100 %
Set Upper ____
-999 - 9999
Selection menu
Setting range:
-999…9999
Assigns the maximum display value (upper limit of the measuring range) to the maximum liquid
level.
Note:
– For the add-on sensor the display range is preset to 0-100%.
16 Bühler Technologies GmbH BE100016 ◦ 02/2018

Nivotemp NT 67-XP, Nivovent NV 77-XP
5.6.10 Sensor measuring range lower limit assignment
This determines the display value (lower limit of the measuring range) for the minimum liquid level:
Basic EF b.EF
Basic Adv. Functions
o.Lo
Assign 0 %
Set Lower ____
-999 - 9999
Selection menu
Setting range:
-999…9999
Assigns the smallest display value (lower limit of the measuring range) to the minimum liquid
level.
Note:
– For the add-on sensor the display range is preset to 0-100%.
5.6.11 Restore factory settings (Reset)
Use the Reset function (rES) to restore the factory settings. All changes will be lost. Since this will also reset the limits, you must
check the liquid level and temperature settings.
Basic EF b.EF
Basic Adv. Functions
rES
Factory setting
Reset ___
no - YES
Confirm
The options are:
Original status:
No,
keep current settings
Original status:
Yes,
reset settings to the factory defaults.
The factory settings are:
Definitions:
SP x / rPxSwitching point / switch-back point x
ds x / drxSwitch-on delay / switch-back delay for switching output x
A x ..Hi / Ax.Lo Maximum and minimum measurement for output
A.ou xAnalogue output signal type
ou xSwitching characteristic for switching output x
o.uni / t.uni Unit for liquid level / temperature
o.Hi / o.Lo maximum / minimum liquid level
r.ou xSwitching output x liquid level or temperature monitoring allocation
dis Display refresh rate
Loc Keylock
SJ.ou switching output logged
do.MM Delay for recording the minimum / maximum liquid level
dt.MM Delay for recording the minimum / maximum temperature
Note: For customer-specific specifications the factory preset may vary from those listed here.
17Bühler Technologies GmbHBE100016 ◦ 02/2018

Nivotemp NT 67-XP, Nivovent NV 77-XP
Version with 2 switching outputs:
Switching outputs Basic Settings
SP1 / rP1 5% / 2%o.uni -I- (%)
ds1 / dr1 / ou1 0 / 0 / Hno t.uni °C
SP2 / rP2 60 / 55°C o.Hi 100 %
ds2 / dr2 / ou2 0 / 0 / Hno o.Lo 0 %
r.ou1 oiL
r.ou2 tEMP
dis FASt
Loc 000
Version with 4 switching outputs:
Switching outputs Basic Settings
SP1 / rP1 5% / 2%o.uni -I- (%)
ds1 / dr1 / ou1 0 / 0 / Hno t.uni °C
SP2 / rP2 15% / 12%o.Hi 100 %
ds2 / dr2 / ou2 0 / 0 / Hno o.Lo 0 %
SP3 / rP3 70 / 65 °C r.ou1 oiL
ds3 / dr3 / ou3 0 / 0 / Hno r.ou2 oiL
SP4 / rP4 80 / 75°C r.ou3 tEMP
ds4 / dr4 / ou4 0 / 0 / Hno r.ou4 tEMP
dis FASt
Loc 000
Version with 6 switching outputs:
Switching outputs Basic Settings
SP1 / rP1 5% / 2%o.uni -I- (%)
ds1 / dr1 / ou1 0 / 0 / Hno t.uni °C
SP2 / rP2 15% / 12%o.Hi 100 %
ds2 / dr2 / ou2 0 / 0 / Hno o.Lo 0 %
SP3 / rP3 70% / 65%r.ou1 oiL
ds3 / dr3 / ou3 0 / 0 / Hno r.ou2 oiL
SP4 / rP4 80 / 75°C r.ou3 oiL
ds4 / dr4 / ou4 0 / 0 / Hno r.ou4 tEMP
SP5 / rP5 80 / 75°C r.ou5 tEMP
ds5 / dr5 / ou5 0 / 0 / Hno r.ou6 tEMP
SP6 / rP6 80 / 75°C dis FASt
ds6 / dr6 / ou6 0 / 0 / Hno Loc 000
Version with analogue outputs:
Analogue outputs
A1.Hi / A1.Lo / A.ou1 0 / 100 / i1
A2.Hi / A2.Lo / A.ou2 0 / 100 / i1
Diagnostic settings:
Diagnostics
SJ.ou out1
dh.MM 0.0
dt.MM 0.0
18 Bühler Technologies GmbH BE100016 ◦ 02/2018