Bühler technologies NT Mx-Atex Series User manual

Fluidcontrol
Installation and Operation Instructions
Original instructions
Level switch for tank installation
NT M...-Atex
BE100011
03/2018
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........................................................... BE100011
Version......................................................................... 03/2018
Part No......................................................................... 9031274

NT M...-Atex
Contents
1 Introduction..................................................................................................................................................................................................................... 2
1.1 Intended Use.........................................................................................................................................................................................................2
1.2 Layout and Functionality ..................................................................................................................................................................................2
1.3 Scope of Delivery.................................................................................................................................................................................................. 2
1.4 Type plate ..............................................................................................................................................................................................................2
1.5 Model Key ..............................................................................................................................................................................................................3
2 Safety instructions.........................................................................................................................................................................................................4
2.1 Important advice.................................................................................................................................................................................................4
2.2 General hazard warnings ................................................................................................................................................................................. 5
3 Transport and storage ..................................................................................................................................................................................................6
4 Installation and connection........................................................................................................................................................................................ 7
4.1 Installation ............................................................................................................................................................................................................ 7
4.2 Electrical connections ........................................................................................................................................................................................ 7
4.2.1 PA connection (potential equalisation) .........................................................................................................................................7
4.2.2 Intrinsically-safe connection............................................................................................................................................................ 8
5 Operation and control ..................................................................................................................................................................................................9
6 Cleaning and Maintenance........................................................................................................................................................................................11
7 Service and repair..........................................................................................................................................................................................................12
8 Disposal............................................................................................................................................................................................................................13
9 Appendices..................................................................................................................................................................................................................... 14
9.1 Technical Data.................................................................................................................................................................................................... 14
9.2 Standard pin assignment ................................................................................................................................................................................15
9.3 Definitions........................................................................................................................................................................................................... 16
10 Attached documents....................................................................................................................................................................................................17
iBühler Technologies GmbHBE100011 ◦ 03/2018

NT M...-Atex
1 Introduction
1.1 Intended Use
The level switches are used to monitor levels and temperatures inside a tank. The measuring tube is inside the tank during the
process.
According to EN60079-11, NTM…-Atex series level switches are simple electrical apparatuses without separate voltage source in-
tended for tank top installation.
When used in explosive areas these types may only be operated on intrinsically-safe circuits. With intrinsically safe connection
they may be installed in Zone 2 explosive areas.
Never use the level switches 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.
Before installing the level switches, verify the listed technical data meet the application parameters. Also observe the applicable
requirements of EN60079-14.
Further verify all contents are complete.
Please note the specific values of the level switches when connecting and the correct version when ordering spare parts.
1.2 Layout and Functionality
The height adjustable level contacts (bistable reed contacts) and temperature contacts (bimetal disc thermostat) are located in-
side the measuring tube. The level contacts are activated by a magnet inside the level switch float.
The temperature is monitored via thermal element mounted to the end of the rail. Choose from temperature contacts with
fixed increments or a resistance thermometer (Pt100).
It installs to the tank via the female thread on the level switch.
1.3 Scope of Delivery
– Level switch
– Elastic profile gasket (NBR) M27x2 (G 3/4)
– Product Documentation
1.4 Type plate
Example:
Nivotemp M-0-Atex-MS-M3/var
1006299A KW: 7-2018 001
Manufacturer and address
Model designation
Order no.+Item no.+Metre
Controller values
Temperature specifications
Pressure specifications
Year of manufacture
Ui=30V, li= 50mA , Pi=100mW
T Medium < 80°C, -20°C < Ta < 80°C
p max. = 1bar, SIMPLE APPARATUS
Read manual! Year: 2018
Bühler Technologies GmbH
Harkortstr. 29 D-40880 Ratingen
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1.5 Model Key
Type designation
Version
MS
VA
= brass
= stainless steel
Plug *
M3
M12
280
370
500
Variable (please specify)
Number of level contacts
1-2
K8
W9
NC/NO
changeover contact (max. 2)
NC contact NO contact
TM50NC
TM60NC
TM70NC
TM80NC
TM50NO
TM55NO
TM60NO
TM70NO
TM80NO
= 50 °C
= 55 °C
= 60 °C
= 70 °C
= 80 °C
= oval flange (for G3/4)
= adapter G3/4 to G1
OV
G1
see "Plug Connection"
*
NT M
Contact type
Options
A
-- - - ---
XX XX XX XX XX XX
Connection
G3/4
Length
-XX
Temperature contact
Pt100 = temperature sensor
-ATEX
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2 Safety instructions
2.1 Important advice
This unit may only be used if:
– The product is being used under the conditions described in the operating- and system instructions, used according to the
nameplate and for applications for which it is intended. Any unauthorized modifications of the device will void the warranty
provided by Bühler Technologies GmbH,
– The specifications and markings in the type plate are observed,
– The specified limits are observed,
– The equipment is operated on intrinsically-safe circuits, see chapter “Intrinsically-Safe Connection”,
– The protective element is installed outside the explosive area,
– No equipment functions exceed the limits,
– Monitoring equipment / protection devices are connected correctly,
– Service and repair work not described in these instructions are performed by Bühler Technologies GmbH,
– Genuine replacement parts are used.
Regulations EN60079-14 and EN60079-17 must be observed when erecting electrical systems in explosive areas.
Additional national regulations pertaining to initial operation, operation, maintenance, repairs and disposal must be observed.
These operating instructions are a part of the equipment. The manufacturer reserves the right to change performance-, specific-
ation- or technical data without prior notice. Please keep these instructions for future reference.
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.
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 Installation and connection
4.1 Installation
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 switches (transmitters) come fully assembled and can be mounted to the tank via by screw-in thread and seal. 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.
4.2 Electrical connections
Please refer to the tables in the appendix for the pin assignment and electrical data of your level switch.
Proceed as follows: Locate (as specified in your order) the plug type, the contact type (NC/NO or changeover contact, with or
without temperature measurement) and the number of contacts.
Please note, every level switch must be connected to the earthed tank container using the existing external PA connection.
4.2.1 PA connection (potential equalisation)
CAUTION Electrostatic charge
Level switch housings must be connected to the tank via external PA connection!
Ensure the level switch is adequately earthed (minimum conductor cross-section 4mm2).
Please also particularly observe the requirements of EN 60079-14.
The level switch has an external PA connection. This is identified by the decal shown on the right. The connection uses an
M4 thread. The PA cable for potential equalisation between the level switch and the tank is not included and must be
supplied and installed by the customer.
Layout of the PA connection:
1 Screw 4 PA cable (to be installed by the customer)
2 Serrated washer 5 Washer
3 Washer
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PA connection example:
Drawing A
1 Temperature switch TSK-Atex 5 PA cable
2 PA decal 6 PA connection on the tank
3 PA connection on the temperature switch 7 Tank
4.2.2 Intrinsically-safe connection
According to EN60079-11 the components for level and temperature monitoring are simple electrical equipment and to be con-
sidered purely ohmic circuits. They may only be operated with an type-tested controller on an intrinsically-safe circuit.
CAUTION Explosion hazard due to prohibited electrical connection data
Prohibited electrical connection data can cause an explosive gas mixture to ignite.
In areas with explosive gas atmospheres the level switch may only be operated with an
intrinsically-safe power supply. The power supply must be suitable for the respective
zone. The limits specified in these operating instructions must be observed and must not
exceeded, even with two separate intrinsically-safe power supplies.
Ensure the limits will not be exceeded, even in the event of a fault, e.g. accidental series
or parallel connection.
Please observe the relevant safety requirements, e.g. EN60079-11 and EN60079-14, when
installing and operating intrinsically-safe equipment.
Please refer to the chart below for the technical parameters and the approved limits (Ui, Ii, Ci, Li, Pi) for intrinsically-safe opera-
tion:
UiIiCiLiPi
Level contact 30V 50mA negligible negligible 100 mW
Temperature contact 30V 50mA negligible negligible 100 mW
Pt100 Temperature Sensor 30V 50mA negligible negligible 100 mW
Remarks about the Pt100 connection
Operate the Pt100 with the respective EX approved RTD converter or a separating barrier with RTD input, suitable for EX. The
measuring current must be ≤1mA to prevent excessive self-heating, which will cause measuring errors.
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