Bühler technologies Nivotemp NT-EL User manual

Fluidcontrol
Installation and Operation Instructions
Original instructions
Level switch
Nivotemp NT-EL
BE100025
08/2020
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 2020
Document information
Document No.......................................................... BE100025
Version........................................................................ 08/2020

Nivotemp NT-EL
Contents
1 Introduction..................................................................................................................................................................................................................... 2
1.1 Intended Use.........................................................................................................................................................................................................2
1.2 Functionality......................................................................................................................................................................................................... 2
1.2.1 Liquid level monitoring ......................................................................................................................................................................2
1.2.2 Temperature monitor .........................................................................................................................................................................2
1.3 Ordering instructions NT-EL.............................................................................................................................................................................2
1.4 Scope of Delivery.................................................................................................................................................................................................. 3
2 Safety instructions.........................................................................................................................................................................................................4
2.1 Important advice.................................................................................................................................................................................................4
2.2 General hazard warnings ................................................................................................................................................................................. 5
3 Transport and storage ..................................................................................................................................................................................................6
4 Setup and connection................................................................................................................................................................................................... 7
4.1 Assembly................................................................................................................................................................................................................ 7
4.2 Electrical connections ........................................................................................................................................................................................ 7
4.3 Information on the correct operation of reed contacts in Bühler level switches.............................................................................8
5 Operation and control ..................................................................................................................................................................................................9
6 Cleaning and Maintenance.......................................................................................................................................................................................10
7 Service and repair.......................................................................................................................................................................................................... 11
8 Disposal............................................................................................................................................................................................................................12
9 Appendices......................................................................................................................................................................................................................13
9.1 NT-EL Technical Data.........................................................................................................................................................................................13
9.2 NT-EL default pin assignment ....................................................................................................................................................................... 14
10 Attached documents....................................................................................................................................................................................................15
iBühler Technologies GmbHBE100025 ◦ 08/2020

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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 level switches are located inside the measuring tube. These are activated by a
magnet inside the level switch float.
The contacts are soldered to the board, spaced as specified in the purchase order.
1.2.2 Temperature monitor
The temperature is monitored via thermal element soldered to the end of the contact board. Choose from temperature contacts
with fixed increments or a resistance thermometer (Pt100).
When equipped with resistance thermometer (model key “Pt100”) the temperature is output using the change in resistance
(0°C = 100Ω) of the Pt100.
Please note the technical data in the appendix.
1.3 Ordering instructions NT-EL
Model key
NT-EL
G1/2
M20
UNF
Brass
MS
Version
Model designation
Connection
Plug
XX
Temperature signal
Pt100
Temperature contact NC contact
TE50NC
TE60NC
TE70NC
TE80NC
= temperature sensor
= 50 °C
= 60 °C
= 70 °C
= 80 °C
M12
Length
280
370
500
variable (please specify)
XX XX XX XX
= G1/2
= M20x1.5
= 7/8-14 UNF
XX
Number of level contacts
1K or 2K (NC / NO)
*
*max. 1 level contact
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Ordering example
You require: Level switch with connector M20x1.5, length L= 370 mm,
2 level contacts, L1 = 280 mm NC / L2 = 320 mm NO
Order NT-EL-MS-M20-M12/370-2K-280NC/320NO
1.4 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 General information
Warns not to inhale toxic gasses Wear respiratory equipment
Warns of corrosive liquids Wear a safety mask
Warns of explosive areas Wear gloves
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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,
– compliance with national installation regulations.
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.
– Do not install damaged or defective spare part. If necessary, visually inspect prior to installation to determine any obvious
damage to the 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 Toxic, acidic gases/liquids
Protect yourself from toxic, corrosive gasses/liquids when performing any type of work.
Wear appropriate protective equipment.
4.1 Assembly
Please note before installing the level switch!
After transport and delivery of the level switch, the switching status of the bistable contacts may be different than required for
proper operation.
Therefore slide the float for the level switch along the level switch tube from below immediately before installation.
This ensures all built-in bistable contacts have a clearly defined switching status (NC or NO).
The level switch comes fully assembled and can be mounted to the tank with 30 Nm of torque. 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.
The level contacts are mounted (with the tank empty) as NO contact (NO) or NC contact (NC).
The contact logic assumes the level switch is installed in an empty tank, i.e. it is only in the operating position once filled.
4.2 Electrical connections
The level switch is powered by 24V (max. 30V). The switch connects with a cable and standard M12 plug-in connectors. Please
refer to the appendix for installation dimensions and plug configuration.
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4.3 Information on the correct operation of reed contacts in Bühler level switches
Based on their construction, reed contacts are very long lasting and reliable components. Yet the following should be considered
when using them:
Life of reed switches
The life of reed switches can be up to 109 cycles. This is reduces by high stress and / or incorrect or the absence of protective cir-
cuits when switching inductive, capacitive or lamp loads.
It’s therefore important to ensure NEVER to exceed one or several of the maximum approved limits, even temporarily, and to
install a contact protective circuit for loads which are not purely ohmic. Using test lamps when installing the devices is also pro-
hibited, as these can temporarily allow too much current to flow, which can damage the reed contacts. In this case non-volatile
testing equipment should always be used.
Contact protective circuits for reed switches
For direct current voltage a recovery diode per figure A must be connected parallel to the contact.
For alternating current voltage an RC circuit per Figure B and Table 1 must be connected parallel to the contact.
A B
Load
Contact
Recovery diode
Load
Contact
RC circuit
Load in VA 10 25 50
Voltage at contact V R/Ohm C/µF R/Ohm C/µF R/Ohm C/µF
24 22 0.022 1 0.1 1 0.47
60 120 0.0047 22 0.022 1 0.1
110 470 0.001 120 0.0047 22 0.022
230 470 0.001 470 0.001 120 0.0047
Please note the max. voltage/load ratings of the respective level contacts!
Voltages and currents
All Bühler level contacts with reed switch can switch minimal Switching voltages of 10µV and minimal switching currents of
1µA.
The maximum values specified for the respective contact types apply.
Level contact with reed switches can therefore be used for SPS applications as well as for high loads (within the maximum lim-
its) without hesitation.
Contact material
All reed switches in Bühler level contacts use rhodium as the contact material for the actual contact areas.
Magnetic fields
Avoid external magnetic fields, including from electric motors. These can interfere with the function of the reed switches.
Mechanical loads
Do not expose the level switch to strong blows or bending.
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5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
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6 Cleaning and Maintenance
This device is maintenance-free.
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.
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7 Service and repair
This chapter contains information on troubleshooting and correction should an error occur during operation.
Repairs to the unit must be performed by Bühler authorised personnel.
Please contact our Service Department with any questions:
Tel.: [phone] or your agent
If the equipment is not functioning properly after correcting any malfunctions and switching on the power, it must be inspected
by the manufacturer. Please send the equipment inside suitable packaging to:
Bühler Technologies GmbH
- Reparatur/Service -
Harkortstraße 29
40880 Ratingen
Germany
Please also attach the completed and signed RMA decontamination statement to the packaging. We will otherwise be unable to
process your repair order.
You will find the form in the appendix of these instructions, or simply request it by e-mail:
[email protected].
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8 Disposal
Dispose of parts so as not to endanger the health or environment. Follow the laws in the country of use for disposing of elec-
tronic components and devices during disposal.
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9 Appendices
9.1 NT-EL Technical Data
Version MS Dimensions
Operating pressure: max. 1 bar
min. 50
L = 280, 370, max. 500 mm (in 10 mm increments)
OD
Seal
(X)
L2 = min. 60 mm
SW27
M12x1
M20x1.5
G1/2
7/8-14 UNF
32
L1 = min. 30
H
Ø18
45
3.5
M20 x1.5
26
14
Eolastic
seal
G1/2
26.6
14
Eolastic
seal
7/8-14UNF
26
12.7
O-ring
OD
H
X
Operating temperature: -20 °C to +80 °C
Float: SK 171
Min. fluid density: 0.80 kg/dm³
Lengths (all versions): 280, 370, 500 mm (standard)
variable to max. 500 mm
Weight at L = 500 mm: approx.180 g
Material
Float: PU
Immersion tube: Brass
G1/2 connection, M20 x
1,5,7/8-14UNF:
Aluminium
Level switching output K40
Number max.: 2 not adjustable
Function: NO / NC*
Max. voltage: 30 V DC
Max. switching current: 0.5 A
Max. contact load: 5 VA
Min. contact spacing: 30 mm (in 10 mm increments)
*NO= falling NC contact / NC = falling NO contact
Optional temperature
Temperature contact: TEL xx
Max. voltage: 30 V DC
Max. switching current: 1 A
Max. contact load: 10 VA
Function: NC
Switching point °C: 50 / 60 / 70 / 80
Switching point tolerance: ± 5 K
Max. hysteresis: 20 K ± 5 K
Other temperatures and switching function available upon request
Temperature sensor
Pt100 DIN EN 60 751 (Tolerance ±0.8 °C)
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9.2 NT-EL default pin assignment
IP rating IP67*
Level contact(s) only Only level contact K40
and temperature con-
tact (TK)
Level contact K40 and
temperature sensor (PT)
Level contacts K40 and
temperature contact
(TK) with special
connection)
* with IP67 cable box attached
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10 Attached documents
– Declaration of conformity KX100029
– RMA - Decontamination Statement
15Bühler Technologies GmbHBE100025 ◦ 08/2020

RMA-Nr./ RMA-No.
Die RMA-Nummer bekommen Sie von Ihrem Ansprechpartner im Vertrieb oder Service./ You may obtain the RMA
number from your sales or service representative.
Firma/ Company
Firma/ Company
Straße/ Street
PLZ, Ort/ Zip, City
Land/ Country
Zu diesem Rücksendeschein gehört eine Dekontaminierungserklärung. Die gesetzlichen Vorschriften schreiben vor,
dass Sie uns diese Dekontaminierungserklärung ausgefüllt und unterschrieben zurücksenden müssen. Bitte füllen Sie
auch diese im Sinne der Gesundheit unserer Mitarbeiter vollständig aus./ This return form includes a decontamination
statement. The law requires you to submit this completed and signed decontamination statement to us. Please com-
plete the entire form, also in the interest of our employee health.
Ansprechpartner/ Person in charge
Name/ Name
Abt./ Dept.
Tel./ Phone
E-Mail
Gerät/ Device
Anzahl/ Quantity
Auftragsnr./ Order No.
Serien-Nr./ Serial No.
Artikel-Nr./ Item No.
Grund der Rücksendung/ Reason for return
Kalibrierung/ Calibration Modifikation/ Modification
Reklamation/ Claim Reparatur/ Repair
andere/ other
bitte spezifizieren/ please specify
Ist das Gerät möglicherweise kontaminiert?/ Could the equipment be contaminated?
Nein, da das Gerät nicht mit gesundheitsgefährdenden Stoffen betrieben wurde./ No, because the device was not operated with
hazardous substances.
Nein, da das Gerät ordnungsgemäß gereinigt und dekontaminiert wurde./ No, because the device has been properly cleaned and
decontaminated.
Ja, kontaminiert mit:/ Yes, contaminated with:
explosiv/
explosive
entzündlich/
flammable
brandfördernd/
oxidizing
komprimierte
Gase/
compressed
gases
ätzend/
caustic
giftig,
Lebensgefahr/
poisonous, risk
of death
gesundheitsge-
fährdend/
harmful to
health
gesund-
heitsschädlich/
health hazard
umweltge-
fährdend/
environmental
hazard
Bitte Sicherheitsdatenblatt beilegen!/ Please enclose safety data sheet!
Das Gerät wurde gespült mit:/ The equipment was purged with:
Diese Erklärung wurde korrekt und vollständig ausgefüllt und von einer
dazu befugten Person unterschrieben. Der Versand der (dekontaminier-
ten) Geräte und Komponenten erfolgt gemäß den gesetzlichen Bestim-
mungen.
This declaration has been filled out correctly and completely, and signed by
an authorized person. The dispatch of the (decontaminated) devices and
components takes place according to the legal regulations.
Datum/ Date
rechtsverbindliche Unterschrift/ Legally binding signature
Falls die Ware nicht gereinigt, also kontaminiert bei uns eintrifft, muss die
Firma Bühler sich vorbehalten, diese durch einen externen Dienstleister
reinigen zu lassen und Ihnen dies in Rechnung zu stellen.
Should the goods not arrive clean, but contaminated, Bühler reserves the
right, to comission an external service provider to clean the goods and in-
voice it to your account.
Firmenstempel/ Company Sign
DE000011
01/2019
RMA-Formular und Erklärung über Dekontaminierung
RMA-Form and explanation for decontamination
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

Dekontaminierungserklärung
Die Analyse defekter Baugruppen ist ein wesentlicher Bestandteil der Qualitätssicherung der Firma
Bühler Technologies.
Um eine aussagekräftige Analyse zu gewährleisten muss die Ware möglichst unverändert untersucht
werden. Es dürfen keine Veränderungen oder weitere Beschädigungen auftreten, die Ursachen ver-
decken oder eine Analyse unmöglich machen.
Bei elektronischen Baugruppen kann es sich um elektrostatisch sensible Baugruppen handeln. Es ist
darauf zu achten, diese Baugruppen ESD-gerecht zu behandeln. Nach Möglichkeit sollten die Baugrup-
pen an einem ESD-gerechten Arbeitsplatz getauscht werden. Ist dies nicht möglich sollten ESD-
gerechte Maßnahmen beim Austausch getroffen werden. Der Transport darf nur in ESD-gerechten Be-
hältnissen durchgeführt werden. Die Verpackung der Baugruppen muss ESD-konform sein. Verwenden
Sie nach Möglichkeit die Verpackung des Ersatzteils oder wählen Sie selber eine ESD-gerechte Ver-
packung.
Beachten Sie beim Einbau des Ersatzteils die gleichen Vorgaben wie oben beschrieben. Achten Sie auf
die ordnungsgemäße Montage des Bauteils und aller Komponenten. Versetzen Sie vor der Inbetrieb-
nahme die Verkabelung wieder in den ursprünglichen Zustand. Fragen Sie im Zweifel beim Hersteller
nach weiteren Informationen.
Analysing defective assemblies is an essential part of quality assurance at Bühler Technologies.
To ensure conclusive analysis the goods must be inspected unaltered, if possible. Modifications or
other damages which may hide the cause or render it impossible to analyse are prohibited.
Electronic assemblies may be sensitive to static electricity. Be sure to handle these assemblies in an
ESD-safe manner. Where possible, the assembles should be replaced in an ESD-safe location. If un-
able to do so, take ESD-safe precautions when replacing these. Must be transported in ESD-safe con-
tainers. The packaging of the assemblies must be ESD-safe. If possible, use the packaging of the spare
part or use ESD-safe packaging.
Observe the above specifications when installing the spare part. Ensure the part and all components
are properly installed. Return the cables to the original state before putting into service. When in doubt,
contact the manufacturer for additional information.
DE000011
01/2019
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