ARCA WEKA 29710 Series User manual
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Notes
Order:
Date:
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Contents
1. Symbols and signs used in the instruction manual 3
2. Safety notes and warnings 3
3. Intended use 4
4. Overview of transmitters and converters 5
5. Type codes 6
6. Functional description 7
7. Bi-stabile switch function 8
8. Scope of delivery 9
9. Unpacking 9
10. Disposing of packaging materials 9
11. Dismantling / Disposal 9
12. Assembly 10
12.1 Installation of transmitter to VLI 11
12.2 Drawing 20010501 –installation of accessories 12
13. Electrical installation 13
14. Commissioning of reed transmitters 13
15. Maintenance 14
16. Technical data 14
17. Troubleshooting 15
18. Transport and storage conditions 16
19. Labelling 16
20. Customer service 16
21. EU Type-examination certificates 17
22. Declaration of safeness for shielded cable (NI version) 21
23. IECEx Certificate of conformity 22
24. Conformity declarations 28
25. Statement for transmitter with HART converter 30
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1. Symbols and signs used in the instruction manual
Warning
Indicates potential damage to the device and / or an injury of the operator or
user in case of failure to observe the instructions.
Caution
Indicates potential damage to the device in case of failure to observe the
instructions.
Safety note
For equipment with normal conditions of use in explosion-prone environments
according to EU-Directive 2014/34/EU (ATEX) or IECEx scheme.
These notes apply in addition to all other notes.
2. Safety notes and warnings
The manufacturer is not liable for damages which are caused as a result of failure to observe safety notes
and warnings.
•Burn hazard! Work on hot magnetic level indicators can lead to bodily injuries and burns. The
surfaces of the float chambers and the process connections can become hot. Let the tank cool
down to ambient temperature prior to carrying out any work on the magnetic level indicator.
Wear appropriate PPE (gloves, face protection, possibly respiratory protection equipment).
Keep sufficient distance during operation.
•The magnetic level indicator and thus also the transmitter can unnoticeably become
inoperative by a blocking of the float. Should you be unsure about the liquid level indicated
another method should be used to check the magnetic level indicator.
•Should you suspect a defective function or should you find such defective function, it must be
remedied.
•Only use the magnetic level indicator and the transmitter, once you have read and understood
the complete instruction manual.
•The present instruction manual must also be accessible for later users.
•Keep magnetic and magnetisable parts (magnets, construction steel, steel wire or clamps etc.)
away from the magnetic level indicator or accessories such as the transmitter. This also
applies to strong electromagnetic fields (transformers, welding equipment etc.), as both can
interfere with the magnetic force of the magnets contained in the magnetic level indicator or the
transmitter and can lead to malfunctions or failures of the indicator or the accessory parts
(switch, transmitter, measuring converter) attached.
•Replace damaged or faulty components with original spare parts.
•Solvents can blunt the plastic components used or can cause cracks. Clean the devices with
soap and water or a plastic cleaner.
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•Falling parts (bolting, floats etc.) can create impact sparks and cause explosions in an
explosion-prone atmosphere. Make sure that an explosion-prone atmosphere does not exist
and no parts fall down when working on the magnetic level indicator.
•When working on the magnetic level indicator, use only equipment and tools which were
approved for the explosion-prone area.
•Polycarbonate indicator rails can be electrostatically charged, e.g. during cleaning. When
discharging, sparks can cause explosions in an explosion-prone atmosphere. Please clean the
parts only with anti-static cleaning agents and auxiliary tools.
3. Intended use
•The transmitters may only be used in connection with original WEKA magnetic level indicators
and their individual parts, e.g. floats.
•The transmitters may only be used for the intended use indicated on the type plate. The data
recorded on the type plate and the data sheet must correspond to the maximum operation
parameters occurring within the plant.
•Intended use, rebuilding measures and alterations of the transmitters not provided by the
manufacturer are carried out at one’s own risk and are potentially dangerous (exclusion of
warranty).
•The transmitters may only be installed, commissioned and maintained by trained specialist
staff.
•The manufacturer is not liable for damages which are caused by improper use or incorrect
operation.
•The transmitters are classified according EN 61140 to protection level II and will be high
voltage tested for 100% each.
•The transmitters may only be used for the intended use indicated on the type plate and the
labelling according to Directive 2014/34/EU and/or IECEx.
•The transmitters may only be installed, commissioned and maintained by trained specialist
staff with knowledge on EX protection.
•The transmitters may only be repaired and modified by the manufacturer (where required in
consultation with the mentioned body).
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4. Overview of transmitters and converters
3-wire
transmitter
10mm resolution
2-wire
transmitter
10mm resolution
Ex
transmitter
10mm resolution
T2
min. 80
M el.
T1
Ø14
~Ø5,7
Start
T2
min. 80
M el.
T1
Ø14
Ø17
~Ø6,2
Start
T2
min. 60
M el.
T1
Ø14
Ø17
~Ø6,2
Start
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5. Type codes
Standard reed transmitters
….. - …- …- 010 - …
available for:
index:
Type of transmitter
3-wire: resistant output or current supplied voltage output
29710
2-wire: 4…20mA current output, current sink
31967
2-wire: Intrinsically safe Ex ia; 4…20mA current output, current sink
32607
2-wire: Flameproof enclosures Ex d, 4…20mA current output, current sink
32608
Specialities
Standard
no marking
With resistant output for HART®, Profibus PA®and Foundation Fieldbus™
29710
R
Transmitter with bi-stable reed switch at the top end
29710 / 31967
BI
Execution
Standard
no marking
for high media temperature
29710 / 31967
W
with terminal box
31967
K
with plug connector
31967
KST
Intrinsically safe Ex ia
29710 / 32607
NI
Flameproof enclosures, Ex id
29710 / 32608
ND
Size of resistance
10 Ohm per step (not applicable for NI/ND)
all
010
Resolution
5mm
all
05
10mm
all
10
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6. Functional description
The transmitters are fit laterally as an accessory on the WEKA magnetic level indicators. The magnet inside
the float activates the reed switches in the transmitter, depending on the level of liquid in the float chamber,
thereby changing the effective value of a resistance network.
For the 2-wire transmitters the resulting voltage output is converted by an internal electronic to a 4...20mA
signal. If the liquid level rises above the measuring range of the transmitter (30 mm) the output signal jumps
to 115% (ca. 22,5mA) and remains on that limit.
i.e.
signal output
of a 2-wire transmitter
4...20mA
i.e.
output load
of a 2-wire transmitter
4...20mA
All transmitters are available in 10mm or 5mm resolution.
The minimum and maximum available electrical measuring length (Mel.) is stated in the technical data or the
data sheets.
•The transmitters of type -NI (Ex i) are to be operated with appropriate intrinsically safe equipment.
The inner capacities and the cable have to be considered. Please find detailed information in the EU
type-examination certificates.
•For each type, none of the specified values must be exceeded. The values apply to ohmic loads. If
the transmitter is overloaded, this leads to a malfunction of the electronics and thus the device is
defective. Protective circuitry can significantly increase the life expectancy of the transmitter.
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7. Bi-stabile switch function
This option is used if the measuring range of the transmitter is shorter than the indication range of the
indicator.
Because the zero point (4mA) is fixed, it is necessary to install the transmitter at the lower start point of
measurement. This will cause the possibility that the float will rise higher than the full scale point (20mA) of
the transmitter. In this case it is possible to use a bi-stabile reed switch on top of the transmitter to avoid a
loss of signal.
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8. Scope of delivery
•When ordering a level indicator with transmitter, hose clamps are included.
•When ordering transmitters as spare parts, hose clamps are never included and must be ordered
separately. Should you place an order, the hose clamp sizes must be specified:
For pipe diameter 30…40mm Article number 80648
For pipe diameter 40…57mm and 57…80mm Article number 84043
•When ordering a transmitter please mention the electrical measuring length Mel.. For spare parts you
will find the electrical measuring length etched on the metal housing of the existing transmitter.
9. Unpacking
1. Open the packaging and remove the transmitter.
2. Make sure that no further parts remain in the packaging.
3. Visually check the transmitter and all parts delivered for potential transport damages. Do not use any
damaged or hazardous parts.
10. Disposing of packaging materials
Preserve the environment and properly dispose of or recycle the packaging material.
11. Dismantling / Disposal
•Dismantling
Prior to dismantling, make sure that the transmitter has been disconnected from the mains and that
the missing transmitter function does not have any effect on the subsequent processes.
•Disposal
Preserve the environment and properly dispose of the transmitter.
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12. Assembly
Prior to assembly, the preparations for unpacking the transmitter must be completed.
Prepare the tools (screwdriver size 4 or nut driver SW 6) and materials (hose clamps) required for the
assembly of the transmitter.
The signal output by cable or connecter is foreseen for the upper side. The red sticker at the lower end of
the transmitter shows the starting point of the measurement. The transmitter should be mounted in that way
that the zero point marking is at the height where the float starts with measurement. See adjacent drawing
20010501.
Position the transmitter on the magnetic level indicator in the subsequent specified assembly position and at
the level on which you want starting the measurement. It may be that you have to loosen the closely located
hose clamps of the indicator rail in order to introduce the hose clamp of the transmitter. After the assembly,
all hose clamps must again be tightened.
Check the position and the seat of the transmitter after you have finished the work.
•Assembly position:
The transmitter is to be assembled 180° opposite the indication rail with the cable outlet towards the
top, taking into account the tolerances. The tolerances depend on the respective pipe diameter (see
subsequent drawing).
Optional:
With the exception of Smartline, there is an option to assemble the transmitter directly next to the
indication rail.
•The cable is to be laid in fixed position.
The hose clamps should be tightened with a torque of 3 … 5 Nm
After the assembly, the transmitter must be fixed tightly and in line with the float chamber.
•Please consider also the instruction details of the certificates.
•Potential equilisation is only guaranteed if both hose clamps are assembled on the standing pipe. If
there is no continuous connection between the standing pipe and the potential equalisation or if only
a hose clamp can be used due to constructive reasons, a connection to the terminal designed for
this purposed must be ensured.
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12.1 Installation of transmitter to VLI
Terminology: L = Length between process connections X = Zero point of transmitter
M = Measuring length (indication length) of VLI
Mel. = Measuring length of transmitter 10mm resolution X = 65mm
C1 = Bottom float extension 5mm resolution X = 30mm
C2 = Top float extension 29710-R-xx version see data sheet
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12.2 Drawing 20010501 –installation of accessories
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13. Electrical installation
i.e. 3-wire transmitter type 29710-xx
i.e. 2-wire transmitter type 31967-xx
Please consider the connecting diagrams of the datasheets or the type labels of the transmitters.
•Wrong polarisation or overload will cause the damage of the device.
14. Commissioning of reed transmitters
Prior to commissioning, the entire assembly (12) must be completed.
•Should the data recorded on the type label (power supply, maximum operating temperature,
maximum load etc.) not match the application, the transmitter can be damaged and represent
danger to human life and the environment. Make sure that the data recorded on the type plate
is a match with the application.
•Inappropriate mounting components (magnetic etc.) can cause error functions and damage
and can endanger human life and the environment. Only use components suitable for the
application.
•Prior to the first commissioning, the transmitter position is undefined. Observe the following
procedure to establish a defined output state.
•Prior to use, check the transmitter for visible exterior damages. Do not commission a damaged
transmitter.
•The transmitter may only be used for intended purposes recorded on the type plate and in the
certificates according to directive 2014/34/EU and/or IECEx scheme.
The magnetic level indicator is filled with liquid via the tank. As soon as the float floats, it needs some time
to adjust itself with regard to the magnetic band of the indication rail. From that point on, the float should
indicate the level by turning the indication flaps.
In order to bring the transmitters into a defined state, we recommend once driving off the complete tank
volume under supervision and visually checking the level so as to be able to guarantee perfect functioning.
It is also possible to bring the transmitter into the specified position by means of a weak hand magnet (e.g.
magnet board). In this way, you can also manually test the mobility of the indication flaps. However, the
flaps should always be put back into starting position.
+
M el. ≤ 1000mm I = 4mA
M el. > 1000mm I = 1mA
S
-
GN
WH
BN
I
4…20mA
WH
BN
+
-
14 … 40VDC
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15. Maintenance
In general, the magnetic level indicator and the transmitter are maintenance-free.
You should only check the transmitter in cases of suspected error function.
You find notes on the approach in chapter “Commissioning” (14).
•Should you suspect or detect an error function, it must be immediately rectified.Damaged or
faulty components must be replaced with original spare parts.
•When checking the output signal, only use hand magnets which are not too strong and which
cannot influence the reed switches of the transmitter with regard to its values. Otherwise, this
can result in a malfunction of the transmitter.
•Clean the transmitter only with a damp cloth. Solvents and abrasive cleaners can destroy
cables, plastic cable gland and type plate.
•Transmitters for the Ex area may only be repaired and modified by the manufacturer (where
required in consultation with the named authority).
16. Technical data
Dimensions: see data sheet
Minimum Mel.: all types 200mm
Maximum Mel.: all types 4000mm
Other lengths on request (multiple piece design)
Minimum medium temperature: all types -50°C
Maximum medium temperature: 29710-W +350°C
31967-W +250°C
all other types +150°C
Minimum ambient temperature: all types -20°C
Ex types -50°C
Maximum ambient temperature: all types +50°C
Standard cable lengths: all types 5 m
not for transmitters with junction boxes or connectors
Protection class: all types IP68-10bar
for junction boxes and connectors see data sheet
Housing material: Stainless steel, 316L
Cable gland material: see data sheet
Cable material: see data sheet
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17. Troubleshooting
Problem
Possible causes
Possible solution
1. No visual level display
despite liquid being in the
tank.
Float is blocked due to dirt in the
float chamber.
Float is damaged, filled with
liquid and has sunk.
Float is stuck on magnetic or
magnetisable components
assembled outside the float
chamber.
Clean float chamber and float (see
instruction manual of the magnetic
level indicator)
Replace the float. Compare test
pressure of the system with the type
plate information.
Look for iron parts along the magnetic
level indicator by means of magnet
(clamps, screws etc.), remove them
and respectively replace them with
original add-on components.
2. No output signal
The installation does not
correspond to the assembly
instructions.
The transmitter is not activated
by the float.
Open circuit, short circuit or
wrong polarity
Check correctly installation.
Consider that accessories have to be
moved/turned when “moving/turning”
the indication rail.
Without indication rail, the float has no
guidance and cannot activate the
accessories!
Check the function of the magnetic
level indicator according to point 1.
Ensure that the right combination of
float chamber type and float was
selected.
Check electrical installation and power
supply.
3. Wrong output signal
Offset in output signal.
Output signal is not linear.
Check the zero point of installation.
Maybe shift the height of transmitter
installation.
The transmitter was probably
overloaded or one reed switch is
permanently closed.
For bi-stabile versions see
descriptions above.
4. Interruptions on output
signal
Float is stuck on magnetic or
magnetisable components
assembled outside the float
chamber.
Look for iron parts along the magnetic
level indicator by means of magnet
(clamps, screws etc.), remove them
and respectively replace them with
original add-on components.
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18. Transport and storage conditions
•Protect transmitters against strong thrusts.
•Do not place any heavy items on the transmitter and its packaging.
•Store the transmitter in a dry environment.
•Avoid contact with water and humidity.
•Protect transmitter against strong magnetic fields.
•Temperature: -10°C … +50°C
•Relative humidity: 10% … 95%
19. Labelling
•The transmitter may only be used for the intended use recorded on the type plate. Please observe
the information on the type plate.
20. Customer service
You find a list with all WEKA representatives worldwide under
www.weka-ag.ch ➢contact ➢representatives and your choice of country
or contact us directly under
WEKA AG
Schuerlistrasse 8
CH-8344 Baeretswil
Switzerland
Phone +41 43 833 43 43
Email [email protected]
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21. EU Type-examination certificates
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This manual suits for next models
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