MAGNETICALLY CONTROLLED LEVEL INDICATOR
Type: ITA-AVK
Digital oder
Analoganzeiger
Manual
November 2008
International Headquarters
INTRA-AUTOMATION GmbH
Otto-Hahn-Str. 20
41515 Grevenbroich
GERMANY
+49-(0)2181-75665-0
+49-(0)2181-64492
info@intra-automation.de
www.intra-automation.com
Subsidiary for BENELUX
B.V. INTRA-AUTOMATION HTP
Bosschendijk 193
4731 DD Oudenbosch
THE NETHERLANDS
+31-(0)165-322201
+31-(0)165-322970
info@intra-automation.nl
ITA-AVK
Manual
Intra-Automation GmbH
Advantages of ITA-AVK
The mounting expense is fundamentally lower than at the use of the float chamber switch.
No mechanical parts between float and indication.
Little influence of density change on the measuring precision.
Version for higher temperatures available.
Construction of the standard level indicator is suitable for most different applications.
Interface measurement possible.
Low wear only reed chain are necessary as spare part.
Can be equipped with an indication rail.
Magnetcally controlled level indicator type: ITA-AVK Functional description
The reed chain is built up, that the resistance of the reed chain against infinitely goes if the magnet
system of the float is outside the measuring length of the reed chain. If the resistance change by
means of a R/I transducer into a 4-20mA signal, a fault signal > 20mA will apply.
If the reed chain will be delivered with a level indicator type ITA, the reed chain is calibrated to the
required measuring length (0-1600mm e.g. = 4-20mA). The measuring length is the distance from
middle of lower to middle of upper process connection.
If the reed chain is delivered separately, this is also by vendor calibrated if a R/I measurand
transducer is part of the delivery. Measurement of 4 mA and final value 20 mA are indicated well
visibly at the protection tube of the reed chain.
The cable gland is not part of delivery. Specalliy for flame proof execution, costumer has to use
suitable cable glands.
Functional check
The function of the reed chain can be easily checked with the help of a stick magnet. If a R/I
transducer is used, the reed chain shall connected as a two wiring system. Put stick magnet on the
outside at the protection tube, the mA signal must rise all 5mms, 10mm or 20mms ( within the ordered
measuring length see description above ). If not please, check whether the fault is within the reed
chain or the R/I transducer is faulty.
Loose the Connections of the reed chain at the measurand transducer and carry out the following
examining steps:
1. Measure the resistance of the reed chain between blue " and yellow"
It has to be:
meas.length ( mm)
x Sole resistors (value per meas.step) /4,7/10/20
meas.step / 5 / 10 / 20mm
In case this is not true, the circuit board is broken.
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Intra-Automation GmbH
Manual
ITA-AVK
2. Measuring of the resistance change:
Connect an ohm meter between blue" and black " . If you go with a stick magnet along the reed
chain from bottom to top, the total resistance must rise all 5mms, 10mm or 20mms around approx.
4,7, 10 or 20 (depending on the used resistors) . If you connect a ohm meter between yellow and
black the total resistance must fall all 5mm, 10mm or 20mm around appr. 20.
If the functions described under point 1 and 2 are correct, you can exclude a defect of the reed chain.
Then it can be only a malfunction of the Transmitter or the power supply for the transmitter is too low.
(12 -- 30VDC)
However make sure that the float magnet system may never be outside the measuring length of the
reed chain because the output signal of the Transmitter will be > 20mA.
Reed chain
blue
yellow
black
Resolution
Total resistance
Power dissipation
:
:
:
5 mm, 10 mm or 20 mm (Distance of reed contacts on resistor chain)
approx. 0,5..5 k
2...max. 5 Watt
Code3
ITA-AVK
Magnetically controlled level indicator (Reed chain)
Design
Standard Reed chain for temperatures up to max. 150 C
N
Reedchain for higher temperatures up to max. 400 C
H
Resolution
Resolution 5 mm
5
10 Resolution 10 mm
20 Resolution 20 mm
ITA-AVK
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ITA-AVK
Manual
Intra-Automation GmbH
Reed chain (Standard)
Max. fluid temperature
150 C
Protection pipe
14 mm
material: 1.4571
Enclosure
IP65
Environmental temperature
-20...+40C
Reed chain (for higher temperatures)
Max. fluid temperature
400 C
Protection pipe
14 mm
material: 1.4571
Enclosure
Environmental temperature
Heat protection
:
:
:
IP65
-20+40 C
Dim. 60 x 4 mm
CAUTION!
Regarding a reed chain with heat protection
please absolutely take care that the reed
chain never (in no case) is to be integrated in an insulation.
Insulating the reed chain can lead to serious damages of the
reed chain, even at considerably lower fluid temperatures
than indicated above, due to a heat accumulation. This leads
to a functional failure of the device.
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Intra-Automation GmbH
Manual
ITA-AVK
Clamp
Standard version
Special version
Necessary for Armaflex-isolation
mounting of a reed chain.
and
Transmitter
erhltliche Gehuse
StandardTransmitter housing
- mat.: Aluminium
- cable entry: Pg16
erhltliche Transmitter
Type: 5333B
EEx i model
output: 4-20 mA
power supply:
8-28 VDC
linearity: 0,2 %
power loss max. 2 Watt
EExd
transmitter housing
- mat.: Aluminium
- epoxy coated,
saekphen
- cable entry: NPT
or M20 x 1,5
Type: TMT 182
EExia IIC T4
Output: 4-20 mA
power supply:
13-30 VAC
linearity: 0,4...0,5
power loss max. 2 Watt
Stainless steel
transmitter housing
- mat.: 316Ti
- cable entry: NPT
or M20 x 1,5
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later
ITA-AVK
Manual
Intra-Automation GmbH
Maintenance
Normally level transmitter type ITA-AVK needs no special maintenance. Latest 2 years after start-up
costumer has to clean all the threads of the field enclosure and has to lubricate these threads while
using grease free of acid. The interval depends on the local stress. Some times it is necessary to
shorten this time.
Important notes for flame proof version
For the flame proofed version only below listed components have to be used:
1.
field enclosure type GUAB 16
approval
: ATEX II 2 GD EEx d IIC T5/T6
2.
R/I-transmitter
operating voltage
operating current
power loss
3.
4.
reed chain
measuring length
power loss
plug
dimension
material
approval
necessary threads
: 8 to 36 VDC
: max. 40 mA
: max. 3 W
: 200 up to 6000 mm
: max. 5 W (for measuring length 6000 mm)
max. 2 W (for measuring length 200 mm)
: 3/8-NPT(M)
: brass/ nickel-plated
: ATEX II 2 GD EEx d IIC
: min. 6
5.
cable gland
The cable gland is not part of the delivery. Costumer has to take care during installation, that only
approved and for the cable diameter suitable glands will be used. After installation there have to be done
a pressure test to guarantee tightness of the installation.
6.
mounting
Item 4 (plug) and item 1 (transmitter enclosure) has to be fixed additional during mounting to the reed
chain tube while using spec. adhesive (f.e. type lock 306-40/ Weicon).
7.
Marking
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Intra-Automation GmbH
Manual
ITA-AVK
Besides the products covered by this brochure, Intra-Automation GmbH also manufactures other highquality and high precision instruments for industrial measurement tasks. For more information, please
contact us (contact details on the backside of this brochure).
Flow Measurement
Itabar-Flow-Sensors
IntraSonic IS200 Ultrasonic Flow Meters
Level Measurement
ITA-mag. level gauges
MAGLINK level indicators
Other measurement tasks:
DigiFlow Flow and Level Computers
IntraCont digital Controllers
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IntraDigit digital indicators
ITA-AVK
Manual
Intra-Automation GmbH
Otto-Hahn-Str. 20
41515 Grevenbroich
GERMANY
Phone: +49 - (0) 21 81 75 66 5 0
Fax: +49 - (0) 21 81 6 44 92
e-Mail: info@intra-automation.de
Internet: www.intra-automation.de
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