UWT Mononivo MN 4000 User manual

Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Table of contents
Page
Safety notes/ Technical support 2
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Introduction 3
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Technical data 4
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Approvals 9
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Options 10
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Mounting 11
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Electrical installation 14
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Signal output 17
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Sensitivity setting 17
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Maintenance 18
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Notes for use in Hazardous Locations 19
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Assembly MN 4040 22
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Disposal 25
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Subject to technical change. We assume no liability for typing errors.
All dimensions in mm (inch). Different variations than specied are possible.
Please contact our technical consultants.
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MN 4000 c gi010817 1

Level limit switch
Series MN 4000
Technical Information / Instruction manual
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Safety notes / Technical support
Notes
• Installation, maintenance and commissioning may be accomplished only by qualied technical personnel.
• The product must be used only in the manner outlined in this instruction manual.
Special attention must be paid to warnings and notes as follows:
WARNING
Relates to a caution symbol on the product: A failure to observe the necessary
precautions can result in death, serious injury and/ or considerable material damage.
WARNING
Relates to a caution symbol on the product: Risk of electric shock
WARNING
A failure to observe the necessary precautions can result in death, serious injury
and/ or considerable material damage.
This symbol is used, when there is no corresponding caution symbol on the product.
CAUTION A failure to observe the necessary precautions can result in considerable material
damage.
Safety symbols
In manual and on
product
Description
CAUTION: refer to accompanying documents (manual) for details.
Earth (ground) Terminal
Protective Conductor Terminal
Technical support
Please contact your local supplier (for address see www.uwtgroup.com). Otherwise you can contact:
UWT GmbH Tel.: [phone]
Westendstr. 5 Fax: [phone]
D-87488 Betzigau [email protected]
www.uwtgroup.com
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
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Introduction
Applications
The device is used for level monitoring in all types of
containers and silos.
It can be used with all powdery and granulated bulk materials
with a densitiy greater than 20 g/l (1.25 lb/ft3) that do not show
a strong tendency to form crusts or deposits.
The units can be delivered with Ex-approvals for use in Dust
Hazardous Areas.
A selection of elds of application:
• Building materials industry
lime, moulding sand, etc.
• Food industry
milk powder, our, salt, etc.
• Plastics industry
plastics granules etc.
• Timber industry
• Chemical industry
• Mechanical engineering
The Mononivo oscillating probe is normally screwed into
the lateral container wall so that it is level with the lling
height to be registered and monitored.
The device can also be mounted from the top of the
container. In this case an extension piece is used to mount
the probe level with the height to be registered.
The length of the probe can be up to 4 m (157”) with an
extension tube (MN 4030, MN 4040) .
The use of a sliding sleeve is recommended so that the
switch point can be changed continuously during operation
of the device.
Function
The piezo-electrically stimulated oscillating rod vibrates
at its mechanical resonance frequency. If the probe is
covered by the bulk material, the damping thus generated
is registered electronically and a corresponding signal
output is actuated.
The oscillation of the rod ensures a certain self-cleaning
effect.
optional
sliding
sleeve
application in
down pipe
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MN 4030
MN 4020
MN 4030
MN 4040
MN 4020
MN 4020
MN 4030
MN 4040
MN 4020
MN 4030
MN 4040

Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Technical data
Dimensions
Thread Flange Temperature
extended shaft (pos.3 2)
Triclamp
Thread Flange Temperature
extended shaft (pos.3 2)
Triclamp
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MN 4020
MN 4030

Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Technical data
Thread FlangeTriclamp
Extension tube
NOT part of
delivery
* Thread on
extension tube
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MN 4040
Pos.2 Pos.5 *
0, W,
J, A, E,
D, G
AR 1"
FNPT 1"
M, N A, F NPT 1"
Pos.2 Pos.5 *
0, W,
J, A, E,
D, G
PR 1"
M, N P NPT 1"
Pos.2 Pos.5 *
0, W,
J, A, E,
D, G
L, M R 1"
S, T, U NPT 1"
M, N L, M,
S, T, U NPT 1"

Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Technical data
Electrical data
Connection terminals 0.14 - 2.5 mm2 (AWG 26 - 14)
Cable entry M20 x 1.5 screwed cable gland
NPT ½“ conduit connection
NPT ¾” conduit connection
Clamping range (diameter) of the factory provided cable glands:
M20 x 1.5: 6 .. 12 mm (0.24 .. 0.47"")
Signal delay Sensor free -> covered ca. 1 sec
Sensor covered -> free ca. 1 .. 2 sec
Safety operation
(FSL,FSH)
Switchable for minimum or maximum safety
Vibration frequency ca. 330 Hz
Overvoltage category II
Pollution degree 2 (inside housing)
Electronics Universal voltage
Relay DPDT
3-wire PNP
Power supply 21 V .. 230 V 50 - 60 Hz ±10%*
22 V .. 45 V DC ±10%*
*incl. ±10% of EN 61010
20 V .. 40 V DC ±10%*
*incl. ±10% of EN 61010
Max. ripple of power
supply
7 Vss at DC 7 Vss
Installed load/ input
current
max. 22 VA/ 2 W max. 0.5 A
Signal output Floating relay DPDT
AC max. 250 V, 8 A non inductive
DC max. 30 V, 5 A non inductive
Open Collector:
Permanent load max. 0.4 A
Short-circuit, overload and reverse polarity
protected
Output voltage equal to input voltage, drop <2.5 V
Indicating light Status of signal output
by built-in LED
Status of signal output
by built-in LED
Isolation Power supply to signal output: 2,225 Vrms
Signal output to signal output: 2,225 Vrms
-
Protection class IIII
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
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Mechanical data
Housing Aluminium housing, powder coated RAL 5010 gentian blue
Seal between housig and lid: NBR
Seal between housing and process connection: NBR
Nameplate: polyester lm
Degree of protection IP67*(EN 60529), NEMA Type 4X
* For version with plug the type of protection can be lower (see option plug/ page 10).
Partition wall
between Zone 20 and
Zone 21 (EPL Da/Db)
Material: stainless steel
Thickness: min. 1 mm
Expected lifetime under
constant functional
vibration stress: 20 years (depending on application and ambient conditions)
Note: in case of high ow rate of abrasive dust, measures shall be provided to mitigate potential
abrasion at the partition wall.
Process connection Material: MN 4020: stainless steel 1.4301 (304)/ 1.4541 (321)* or 1.4404 (316L)
MN 4030/ 4040: stainless steel 1.4301 (304)/ 1.4541 (321)* or 1.4404 (316L)
(process connection and tube extension)
* The listed or higher-quality corrosion-resistant materials can be used.
Filler materials are not listet.
Thread: G 1", G 1¼", G 1½" DIN 228;
NPT 1", NPT 1¼", NPT 1½" ANSI B 1.20.1
Flange: according to selection 1.4541 (321) or 1.4404 (316L)
Triclamp: stainless steel 1.4301 (304) or 1.4404 (316L)
2" (DN50) ISO 2852
All material food grade
Technical data
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Series MN 4000
Technical Information / Instruction manual
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Technical data
Operating conditions
Ambient temp. (housing) -40°C .. +60°C (-40 .. +140°F)
Process temperature -40°C .. +150°C (-40 .. +302°F)
For versions with Ex-approvals: see remarks on page 21.
Ventilation Ventilation is not required
Min. powder density Setting Min. powder density (ca.)
I 20 g/l (1.25 lb/ft3)
II 80 g/l (5 lb/ft3)
III 150 g/l (9.4 lb/ft3)
IV 300 g/l (18.7 lb/ft3)
Features of bulk material No strong tendency to cake or deposit
Max. mechanical load 400 N (@40°C, 104°F) laterally (on oscillator rod)
Recommended protection in case of high material load: mounting of an protective angle above the
probe
Max. mechanical torque MN 4030: 180 Nm (@40°C, 104°F)
MN 4040: 100 Nm (@40°C, 104°F)
Max. process pressure 16 bar (232 psi)
For versions with “sliding sleeve without process overpressure” (option pos.25 a,b,c): unpressurized.
The max. process pressure may be reduced with use of anges. Observe ange standards for
pressure rating and pressure derating with higher temperature.
For versions with Ex-approvals: see remarks on page 19.
Vibration 1.5 (m/s2)2/Hz according to EN 60068-2-64
Relative Humidity 0 - 100%, suitable for outdoor use
Altitude max. 2,000 m (6,562 ft)
Expected product lifetime Following parameters have a negative inuence on the expected product lifetime:
High ambient- and process temperature, corrosive environment, high vibration, high ow rate of
abrassive bulk material passing the sensor element.
Tolerance length "L" ±10 mm (±0.39")
Oscillator Material: stainless steel 1.4404 (316L) (food grade)
Sound level max. 50 dBA
Overall weight (ca.) MN 4020: 1.3 kg (2.9 lbs)
MN 4030: 1.3 kg (2.9 lbs) +1.3 kg/m (+2.9 lbs per 39.3") extension
MN 4040: 1.8 kg (4.0 lbs) +1.3 kg/m (+2.9 lbs per 39.3") extension
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
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Approvals
General Purpose
(Ordinary Locations)
Depending on selected
version in price list.
CE/ UKCA EN 61010-1 (IEC/CB)
FM/ FMC
TR-CU
Hazardous Locations
Depending on selected
version in price list.
ATEX Dust explosion ATEX II 1/2D Ex ta/tb IIIC T! Da/Db
UKEX Dust explosion UKEX II 1/2D Ex ta/tb IIIC T! Da/Db
IEC-Ex Dust explosion IEC-Ex ta/tb IIIC T! Da/Db
FM/ FMC Dust explosion Cl. II, III Div. 1 Gr. E,F,G
TR-CU Dust explosion Ex ta/tb IIIC T120°C...T150°C Da/Db X
KC Dust explosion Ex ta/tb IIIC T* °C Da/Db
CCC Dust explosion Ex ta/tb IIIC T! Da/Db
INMETRO Dust explosion Ex ta/tb IIIC T! Da/Db
Detailed allocation of types and electronics to approvals: see selection list.
EMC EN 61326 - A1
Food grade material According to directive 1935/2004/EC
RoHS conform According to directive 2011/65/EU
Pressure Equipment
Directive (2014/68/EU)
As the equipment does not have pressure-bearing housings of its own, it is not subject to the PED:
- as “pressure accessory” (see 2014/68/EU Art. 2 (5) and PED Guidelines A-08, A-40)
- as “safety accessory” (see 2014/68/EU Art. 2 (4) and PED Guidelines A-20, A-25)
Technical data / Approvals
Transport and Storage
Transpor t Observe the instructions as stated on the transport packaging, otherwise the products may get
damaged.
Transport temperature: -40 .. +80°C (-40 .. +176°F)
Transport humidity: 20 .. 85%
Transport incoming inspections must be caried out to check for possible transport damage.
Storage Products must be stored at a dry and clean place. They must be protected from inuence of corrosive
environment, vibration and exposure to direct sunlight.
Storage temperature: -40 .. +80°C (-40 .. +176°F)
Storage humidity: 20 .. 85%
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Series MN 4000
Technical Information / Instruction manual
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Weather protection
cover
When the measuring device is used outdoor, the use
of the weather protection cover is recommended. It
protects the device from all atmospheric inuences
such as:
• rain water
• condensation of water
• excessively high temperatures due to insulation
• excessively low temperatures in winter
Material: PE, weathering and temperature stable
Not available for housing version d and de.
For use in Hazardous Locations: only permitted for
Category 3 (zone 22) or Division 2.
Sliding sleeve MN 4030 G 1½“ ISO 228 or
1½” NPT ANSI B 1.20.1
or anges
Material:1.4301 (304) or 1.4571 (316TI)
Version with selection code pos.25 a,b,c:
Only for applications without process pressure, max.
150°C (302°F). Not available for Ex-approvals.
Version with selection code pos.25 e,f,g:
For applications with process pressure, max. 16bar
(232psi), 150°C (302°F). Sealing material to the
extension tube: FPM or NBR
Mounting set Screws and washers for xing the unit on a ange.
Glass window in lid To see the indicating light on the electronic from
outside.
Control lamp Bright indicating light (LED) seen from outside.
Not available for use in Hazardous Locations and
FM general purpose.
Plug 4-pole
(incl. PE) IP65
Used instead of cable gland.
Not available for use in Hazardous Locations and
FM general purpose.
Options
Glas window
A 100 mm (3.94“)
B 165 mm (6.5“)
C 88 mm (3.46“)
LED
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
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Process pressure Improper installation may result in loss of process pressure.
Chemical resistance
against the medium
Materials of construction are chosen based on their chemical compatibility (or inertness) for general
purposes. For exposure to specic environments, check with chemical compatibility charts before
installing.
Temperature range The range of the ambient and process temperature of the device must be observed (see page 8 and for
Ex-approvals page 21)
Mechanical load The torque at the fastening spot must not exceed
180 Nm MN 4030/ 100 Nm MN 4040
Maximum length „L“ in dependence on the deviation
(in degrees) from vertical installation:
Mounting location Keep distance to incoming material and to the silo wall.
The installation has to be done in a way, that the sensor elements cannot hit the wall of the silo. The
ow of the medium and xtures in the container must be considered. This is especially important for
extension length more than 3 m (118.1“).
Sliding sleeve “Pressure tight” version (pos.25 e,f,g):
Tighten both straining screws M8 with 12 Nm
to obtain resistance against pressure.
Flange mounting A plastic sealing must be used to tighten the ange.
Fastening of the
threaded process
connection
Mounting torque for the thread may not exceed 80 Nm. Use a 50 mm (1.97“), for units with sliding
sleeve use a 55 mm (2.17“), open-end wrench. Do not fasten by turning the housing .
Food grade material The materials are available for the use under normal and predictable applications (according to
directive 1935/2004 Art.3). Other conditions can inuence the safety.
Mounting
General Safety Instructions
Max. deviation Max. length “L”
5° 4,000 mm (157.5“)
45° 1,200 mm (47.24“)
>45° 600 mm (23.62“)
Load
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
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Mounting
Additional Safety Instructions for Hazardous Locations
Installation regulations For devices to use in hazardous locations the respectively valid installation regulations must be
observed.
Sparks The installation has to be done in a way mechanical friction or impact can not cause sparks between
the aluminium enclosure and steel.
Mounting instructions
Oscillating rod Do not bend, shorten or extend the oscillating rod since this will destroy the device.
Rotatable housing and
orientation marking of
oscillating rod
The housing can be rotated against the
threaded connection after mounting.
Direction of the cable
glands
When the unit is mounted from the side, ensure, that the cable glands faces downwards and are
closed to avoid water penetration into the housing. The housing can be rotated against the threaded
connection after mounting.
Sealing Seal the process thread with PTFE sealing tape in case of process pressure
Precaution for later
dismounting/ Service
Grease the screws of the lid if corrosive atmosphere is present (e.g. close to sea)
Switching point Heavy bulk material -> the signal output switches when the oscillating rod is covered a few mm
Light bulk material -> the signal output switches, when the oscillating rod is covered a few cm
Orientation marking of threaded
connection shows the orientation of
the oscillating rod after mounting.
Housing
Threaded connection
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Series MN 4000
Technical Information / Instruction manual
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Mounting
Bulk material
slides down more
easily, if the device
is mounted with
inclination
(recommended)
1½“ sliding sleeve
Switch point can be set
Sensitive
area
Steel angle in case of
high mechanical loading
(approx. 200 mm (7.87“)
distance)
Full detector
Empty detector
Observe max.
torque
CORRECT
Vibrating rod leads
into the product
WRONG
Socket too long:
material chokes
socket
WRONG
Oscillating rod orientation marking
facing sideways:
-> reduces mechanical stability of
the oscillating rod when material
is discharged
CORRECT
Oscillating rod orientation
marking facing either up
or down.
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MN 4030
MN 4040
MN 4030
MN 4020
MN 4030
MN 4040

Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Electrical installation
Handling In the case of inexpert handling or handling malpractice the electric safety of the device cannot
be guaranteed.
Protective earthing Before any electrical installation, the device must be connected to the protective earthing
terminal inside the housing.
Installation regulations The local regulations must be observed.
With use of 24 V supply voltage, an approved power supply with reinforced insulation to mains is
required.
Fuse Use a fuse as stated in the connection diagrams (page 16).
RCCB protection In the case of a defect, the distribution voltage must automatically be cut off by a RCCB
protection switch so as to protect the user of the device from indirect contact with dangerous
electric tensions.
Power supply switch A Power-supply-disconnecting switch must be provided and marked near the device.
Wiring diagram The electrical connections have to be made according to the wiring diagram.
Supply voltage Compare the supply voltage applied with the specications given on the electronic and name
plate before switching the device on.
Cable gland/ closing
element
The screwed cable gland and closing element must have following specications:
Ingress protection IP67, temperature range from -40°C to +70°C, certied depending on the
country where the unit is installed, pull relief.
Make sure that the screwed cable gland safely seals the cable and that it is tight (danger of water
intrusion). Cable glands that are not used have to be locked with a closing element.
Conduit system In case of using a conduit system (with NPT thread) instead of a cable gland the regulations of
the country where the unit is installed must be observed. The conduit must have a tapered thread
either NPT ½“ or NPT ¾” in accordance with the unit and ANSI B 1.20.1. Not used inlets must be
closed tight with a metal closing element.
Field wiring cables • The diameter has to match to the clamping range of the used cable gland.
• The cross section has to match with the clamping range of the connection terminals and
consider the max. current.
• All eld wirings must have insulation suitable for at least 250 V AC.
• The temperature rating must be at least 90°C (194°F).
• If higher immunity interferences as specied in the stated EMC standards are present (see
chapter approval), a shielded cable is required, otherwise an unshielded instrumentation cable
is satisfactory.
Connecting the terminals Make sure that max. 8 mm (0.31“) of the pigtails are bared (danger of contact with live parts).
Guiding the cables in the
terminal box
Cut the eld wiring cables to appropriate length to t properly into the terminal box.
Relay and transistor
protection
Provide protection for relay contacts and output transistors to protect the device against spikes
with inductive loads.
Protection against static
charging
The housing of the unit must be grounded in any case to avoid static charging of the unit on
applications with pneumatic conveying and non-metallic containers .
General Safety Instructions
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Series MN 4000
Technical Information / Instruction manual
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Electrical installation
External equipotential
bonding terminal
Connect with
equipotential
bonding of
the plant
Field wiring A pull relief must be provided for the eld wiring cables, when the device is installed with the factory
provided cable glands.
Cable glands Installation according to the regulations of the country, where the product is installed.
Not used entries have to be closed with blanking elements certied for this purpose.
Where available the factory provided parts must be used.
A strain relief must be provided for the eld wiring cables, when the device is installed with the factory
provided cable glands.
The diameter of the eld wiring cable must match to the clamping range of the cable clamp.
If other than the factory provided parts are used, following must be ensured:
The parts must have an approval adequate to the approval of the level sensor (certicate and type of
protection).
The approved temperature range must be from the min. ambient temperature of the level sensor to the
max. ambient temperature of the level sensor increased by 10 Kelvin.
The parts must be mounted according to the instructions of the supplier.
Conduit system
for FM
In addition the regulations of the country must be observed. The used ameproof seals and blanking
elements must have an adequate type approval and a temperature range of at least –40°C (-40°F)
to +80°C (176°F). In addition they shall be suitable for the conditions and correctly installed. Where
available the provided original parts of the manufacturer must be used.
Commissioning Commissioning only with closed lid.
Opening the lid Before opening the lid take care, that no dust deposits or whirlings are present.
Do not remove the lid (cover) while circuits are alive.
Additional Safety Instructions for Hazardous Locations
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Series MN 4000
Technical Information / Instruction manual
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Electrical installation
Connection
Connecting
terminals
Protective
Conductor
Terminal
3-wire
PNP
Power supply:
20 .. 40 V DC ±10%*
*incl. ±10% of EN 61010
Input current: max. 0.5 A
Fuse:
max. 4 A, fast or slow, 250 V
Signal output:
max. 0.4 A
Output voltage equal to input
voltage, drop <2.5 V
Load for example:
PLC, relay, contactor, bulb
PE + - Load
Power supply
Universal voltage
Relay DPDT Power supply:
21 V .. 230 V 50 - 60Hz ±10%* 22 VA
22 V .. 45 V DC ±10%* 2 W
*incl. ±10% of EN 61010
Fuse on power supply:
max. 10 A, fast or slow, HBC, 250 V
Signal output:
Floating relay DPDT
AC max. 250 V, 8 A, non inductive
DC max. 30 V, 5 A, non inductive
Fuse on signal output:
max. 10 A, fast or slow, HBC, 250 V Signal output
+ -
L N
Power supply
PE
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Series MN 4000
Technical Information / Instruction manual
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Signal output / Sensitivity setting
FSL/ FSH Setting
If the sensor is used to indicate full load, set to
Fail Safe High.
Power failure or line break is regarded as „full“
signal (protection against overcharging).
If the sensor is used to indicate empty load, set
to Fail Safe Low. Power failure or line break is
regarded as „empty“ signal (protection against
running dry).
FSH
Signal output
Signal output Signal output
Setting
Relay DTPT
3-wire PNP
LED “Signal output”
LED „Signal
output“
Setting
“FSL/ FSH”
Sensitivity setting
All sensors are factory setted to position "III" to cover the majority of applications.
If the bulk material is heavy and has a strong tendency to cake or deposit, the setting can be set to position „IV“ so as to decrease the
sensitivity of the probe.
If the bulk material is light and has few or no tendency to cake or deposit, the setting can be set to position „II“ or "I" so as to increase
the sensitivity of the probe.
The table indicates the approximate min. bulk density depending on the settings.
Please contact manufacturer if you intend to use the device for special purposes.
Setting „Sensitivity“
FSL
Setting Sensitivity/
Powder density (ca.)
IHigh
>20 g/l (1.25 lb/ft3)
II Medium high
>80 g/l (5 lb/ft3)
III * Medium low
>150 g/l (9.4 lb/ft3)
IV Low
>300 g/l (18.7 lb/ft3)
* factory preset
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FSL FSH FSL FSH
FSL
FSH

Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Maintenance
1. Open the housing lid
2. Remove the eld wiring cables/ plug
3. Unscrew the cover plate
4. Take out the electronic board and remove internal plug
5. Insert a new electronic board in reverse sequence
6. Connect the eld wiring cables
Change of the electronic board:
Deenergise device and secure against being switched on again.
Opening the lid (cover) Before opening the lid for maintenance reasons observe following items:
• Do not remove the lid while circuits are alive.
• No dust deposits or whirlings are present.
• No rain can enter into the housing.
Frequent check
of the unit
To ensure durable safety in hazardous locations and with electrical safety, following items must be
checked frequently depending on the application:
• Mechanical damage or corrosion of any components (housing side and sensor side) and of the eld
wiring cables.
• Thight sealing of the process connection, cable glands and enclosure lid.
• Properly connected external PE cable (if present).
Cleaning If cleaning is required by the application, following must be observed:
• Cleaning agent must comply with the materials of the unit (chemical resistance). Mainly the lid
sealing, cable gland and the surface of the unit must be considered.
The cleaning process must be done in a way, that:
• The cleaning agent cannot enter into the unit through the lid sealing or cable gland.
• No mechanical damage of the lid sealing, cable gland or other parts can happen.
A possible accumulation of dust on the unit does not increase the maximum surface temperature and
must therefore not be removed for purposes of maintaining the surface temperature in hazardous
locations.
Function test A frequent function test may be required depending on the application.
Observe all relevant safety precautions related with a safe work depending on the application (e.g.
hazardous locations, hazardous bulk material, electric safety, process pressure).
This test does not proof if the sensor is sensitive enough to measure the material of the application.
Function test is done by stopping the vibration of the vibrating rod with appropriate means and monitor
if a correct change of the signal output from uncovered to covered happens.
Production date The production date can be traced by the serial number on the typeplate. Please contact the
manufacturer or your local distrubutor.
Spare parts All available spare parts are stated in the selection list.
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Notes for use in Hazardous Locations
Zone classication
Usable in
zone
Category Equipement
Protection
Level (EPL)
Dust applications 20, 21, 22 1 D Da * in case of conductive dust
additional demands for the
installation are possible.
21, 22 2 D Db
22 3 D* Dc
General Notes
Marking Devices with EX approval are marked on the name plate.
Process pressure Devices with Ex Approval are approved for atmospheric pressure.
A detailed explanation is given below for ATEX and applies analogously for other Ex approvals:
The scope of the ATEX directive is generally limited to atmospheric pressure, see ATEX directive
2014_34_EU Chapter 1 Art.2 (4).
Atmospheric pressure is dened as absolute pressure 0.8bar to 1.1bar, see ATEX guideline §50 and IEC
60079-0 chapter 1 Scope.
The technical background is that an explosive atmosphere which is compressed (overpressure) or
released (underpressure) can exhibit different explosion behaviour than under atmospheric conditions.
The standards for the types of protection against explosion (IEC 60079 series), on which a type
approval according to the ATEX directive is based, are designed for atmospheric conditions and do not
automatically cover deviating pressure conditions.
Thus, an ATEX type approval issued in accordance with this directive only covers atmospheric
pressure.
This applies to all manufacturers.
A deviating operating pressure can be assessed and approved by an expert for the respective
application.
Regardless of this, the design of the level indicators is suitable for a vessel overpressure /
underpressure in accordance with the specied technical data.
Process and ambient
temperature
The permitted temperature ranges are marked on the name plate.
The max. permitted ambient and process temperatures (including temperature derating) stated in this
manual must be observed.
Electrostatic charge The apparatus shall be installed in a way that danger caused by electrostatic charges is avoided.
Specic conditions of use
Year of manufacturing 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
Marking code K L M N P R S T U V W X
ATEX/ UKEX: Year of manufacturing
Marking on the name plate is done according to IEC 60062 as follows:
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Level limit switch
Series MN 4000
Technical Information / Instruction manual
page
Permitted zones for mounting in partition wall
EPL Db
Category 2D
Zone 21
EPL Da
Category 1D
Zone 20
Notes for use in Hazardous Locations
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MN 4020
MN 4030
MN 4040