Aktek ALIT-TIF User manual

USER’S GUIDE
Installation & Operation
Instructions
Ultrasonic Level Meter
Model ALIT-TIF

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Table of contents
1. Introduction ........................................................................................................3
1.1 Application: ..........................................................................................................3
1.2 Features:...............................................................................................................3
1.3 Structure:..............................................................................................................3
1.4 Measuring principle: Time-of-flight method........................................................4
1.5 Technical data: .....................................................................................................5
2. Installation...........................................................................................................7
2.1 Installation considerations ...................................................................................7
2.2 Mounting..............................................................................................................8
3. Wiring ..............................................................................................................109
3.1 Wiring diagram.................................................................................................109
3.2 Power Supply....................................................................................................109
3.3 Load Resitance ............................................................................................... 1010
3.4 Cable............................................................................................................... 1010
3.5 Explosion Proof connection ........................................................................... 1010
4. Operation..........................................................................................................12
4.1 display and keys ...............................................................................................121
4.2 Two working mode.............................................................................................12
5. Calibration........................................................................................................14
General consideration..............................................................................................14
6. Trouble-shooting ...........................................................................................15

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1.Introduction
1.1 Application:
The series is an compact 2-wire series ultrasonic level meter for
continuous non-contact level measurement in liquids and solids. It consists
of probe and electronic units, both of which are leak-proof structure. This
series can be widely applied to the metallurgical, chemical, electricity and oil
industries, particularly suitable for explosion-proof environment.
1.2 Features:
Continuous non-contact level measurement with compact version;
Integrated design, installed conveniently;
With the explosion-proof grade: ExiaIICT6;
Protected in the excessive voltage and current , protected in the thunder
and lightning;
The big show window of LCD is easy to debug and observe;
Excellent anti-interference capability;
4-20mA output;
Intellectual signal treatment technology, guarantee that the instrument
meets various kinds of operating occasion
All metal outer cover ( IP67 ), airproof and alkali-resisting, meet the
abominable environment.
1.3 Structure:
The series is consists of sensor and electronic unit.

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1.4 Measuring principle: Time-of-flight method
The sensor of the meter pulses in the direction of the product surface. There,
they are reflected back and received by the sensor. The meter measures the
time t between pulse transmission and reception. The meter uses the time t
(and the velocity of sound c) to calculate the distance D between the sensor
membrane and the product surface: D = c •t/2 . As the device knows the
empty distance H from a user entry, it can calculate the level as follows:
h = H –d .
An integrated temperature sensor compensates for changes in the velocity of
sound caused by temperature changes. Calibration Enter the empty distance
H and the span F to calibrate the device.
Blanking distance: Span F may not extend into the blanking distance B.
Level echo from the blanking distance cannot be evaluated due to the
transient characteristics of the sensor.
H: installation height
d:distance value
h:level value
B:blacking distance
F:level full scale

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1.5 Technical data:
1.5.1 Basic data
Range：ALIT4：4m
ALIT8：8m
Blocking distance ： ALIT4:0.20m（PVC -probe）0.30m（PTFE-probe）
ALIT8：0.30m（PVC-probe）0.40m（PTFE-probe）
Accuracy ：0.2% of span in air (with standard signal strength )
Resolution ：1mm
Display type ：4 segment LCD
Signal output ：4-20mA
Output load ：0 - 600Ω( See the load with the supply curve on next page )
Output resolution ratio ：0.03% of the actual range
Parameter set up：3 induction buttons
Temperature range: -40ºC-70ºC
Temperature compensation ：automatic in the whole range
Pressure range ：±0.2MP
Power supply ：DC24V（allowed power range : DC21v - DC27v），35mA
Signal wire diameter ；Φ6-Φ12mm
Single wire diameter ：Φ0.5Φ-1.78mm
Cable fix ：PG13.5 gland
Beam angle ：8º(3db)
Measure cycle ：1.0-2.0 seconds
Crust material ：Electrical unit ：Cast aluminum, surface spray
probe（transmitter）： PVC / PTFE
probe of the intrinsically safe explosion-proof instrument ：
the common type ：PVC，with aluminum tube
the anticorrosive type ：PTFE ，with stainless steel tube
Enclosure rating ：IP67
Mounting mode ：thread 、flange
Butt joint flange dimension （Airtight container）：
min inner diameter: 65mm，max length: 500mm.
1.5.2 data of the intrinsically safe explosion-proof type:
explosion-proof grade：ExiaIICT6
1. technical parameter ：Ui：27v
Ii：120mA
Pi: 3.24W
Ci: 0.0005uF
Li: 0mH

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2. associated apparatus: S2022 I.S. barrier
Explosion-proof grade：ExiaIIC
Uo: 24v
Io: 26mA
Co: 0.04uF
Lo: 0.5mH
the series resistance and supply voltage curve:

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2.Installation
Reasonable installation is critical factor of the instrument’s normal working.
2.1 Installation considerations
2.1.1 general hints
Installation must be carried out by trained person in accordance with the
manual.
The temperature of the process may not exceed 60℃，and the pressure
may not exceed ±0.1 MPa.
The use of metallic fittings or flanges is not recommended.
For exposed or sunny locations a protective hood is recommended.
Make sure the distance between the probe and the maximum level
exceeds the blacking distance, because the probe cannot detect any
liquid or solid surface closer than the blacking distance to the probe’s
face.
Install the instrument at right angles to the surface of the measuring
material.
Obstructions within the beam angle generate strong false echoes.
Wherever possible, the transmitter should be positioned to avoid false
echoes.
The beam angle is 8°, in order to avoid large echo loss and false echo,
the probe should not be mounted closer than 1 m to the wall. it is
advisable to maintain a distance of at least 0.6m from the center line of
the probe for every foot (10cm per meter) range to the obstruction.
2.1.2 hints for liquid surface conditions
Foaming liquids can reduce the size of the returned echo because foam
is a poor ultrasonic reflector. Mount an ultrasonic transmitter over an
area of clear liquid, such as near the inlet to a tank or well. In extreme
conditions, or where this is not possible, the transmitter may be
mounted in a vented stilling tube provided that the inside
measurement of the stilling tube is at least 4 in. (100 mm) and is
smooth and free from joints or protrusions. It is important that the
bottom of the stilling tube stays covered to prevent the ingress of
foams.
Avoid mounting the probe directly over any inlet stream.
Liquid surface turbulence is not normally a problem unless it is excessive.
The effects of turbulence are minor, but excessive turbulence can be

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dealt with by advising the technical parameters or a stilling tube.
2.1.3 hints for solid surface conditions
For fine-grained solids, the sensor must be aligned with the product
surface.
2.1.4 hints for in-tank effects
Stirrers or agitators can cause a vortex. Mount the transmitter off-center
of any vortex to maximize the return echo.
In non-linear tanks with rounded or conical bottoms, mount the
transmitter off-center. If needed, a perforated reflector plate can be
installed on the tank bottom directly under the transmitter center line
to ensure a satisfactory return echo.
Avoid mounting the transmitter directly above pumps because the
transmitter will detect the pump casing as the liquid falls away.
When install to the cold area, should choose the lengthen sensor of the
level meter ，make the sensor extend into the container, shun frost
and icing .
2.2 Mounting
2.2.1 dimensions

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2.2.2 mounting measures
There are several methods of mounting the instrument.
Screw mounted
Hints: Always use the nut to screw the probe.
Flange mounted
If the maximum level to be measured falls within the blocking distance,
the transmitter must be mounted on a nozzle using an adapter flange.
Hints:
a) Select as big a nozzle diameter as possible, but keep the height as
small as possible.
b) The inner surface of the nozzle should be as smooth as possible (no
edges or welding seams).
c) The limit of nuzzle as follow:
Measuring range
Min diameter
Max length
4m、8m
65mm
400mm
Bracket mounted
The mounting bracket can be used on open tanks or above conveyor
belts. The sensor is screwed into the socket provided.
Hints: Always use the nut to screw the probe.

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3.Wiring
The series has one LCD and three keys and some terminal blocks, they are
located within the host housing and can be operated when the cover is open.
3.1 Wiring diagram
Remove the cover of the connection box, the terminal blocks are shown .
3.2 The power supply
The power supply should be DC24V (DC21V---DC27V), and the current
should be 35mA at least. Ultrasonic level meter should be sampling the load
resistor in series with power supply.

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3.3 The load resistance
Load resistance and supply voltage diagram
3.4 The cable
A cable comprising screened, twisted pairs is recommended, the diameter
should be between 5-9mm, the distributed capacitance of the cable should
be less than 0.0395uF, distributed inductance should be less than 0.5mH.
The cable shield must be grounded.
3.5 The explosion-proof connection
The explosion-proof type is intrinsically safe, the grade is ExiaIICT6. The instrument should be
connected with barrier when using. S2022 I.S. barrier is the associated apparatus of the
instrument, and its explosion-proof grade is ExiaIIC, power supply is DC24V (±10%).

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4. Operation
4.1 display and keys
The series is displayed with 4 digit LCD.
The series has three keys, with its functions as follow:
Keys
Functions
SEL
Selection of the display content or parameter
INC
Changing the value of the certain digit from 0 to 9 in turn
MOV
Selection of the digit to be changed
4.2 Two working mode
The instrument has two working mode: running state and operating state.
In running mode, the measurement is displayed. In programming mode,
data is displayed to assist with programming.
4.2.1 running mode
When the power is turned on, the instrument takes several seconds to
initialize and then show the running status. The level value、the empty
value and the temperature value will be shown in turn. Choose the wanted
shown value through the SEL key.
The unit of the level value and the empty value is meter (m), the unit of the
temperature is Degrees Celsius (℃).
The output current is always corresponding to the level value, no matter
which value disappears on the panel.
Push the buttons firmly, but not too hard, to avoid damaging the circuit
boards. Also, to avoid entering incorrect data, do not push the buttons too
fast.
terminals
display
keys

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The instrument will show the measuring value in turn as follows in running
mode.
4.2.2 operating mode
In the operating mode data is displayed to assist with programming.
When SEL and MOV keys are pressed simultaneously, the instrument can
enter or exit of the mode. Press SEL key to select the content. And the
changeable contents and parameters will be shown in turn in operating
mode, please pay attention to the alphabet in the following examples.
Display Mode
LCD
Installation height
first shown：press SEL then shown:
Level full scale
first shown：press SEL then shown:
Zero Scale
first shown: P3 press SEL then shown: 0.000
first shown: P4 press SEL then shown: PL00
Inner password
Notes:
Push the buttons firmly, but not too hard, to avoid damaging the circuit
boards. Also, to avoid entering incorrect data, do not push the buttons
too fast.
The operating modes are shown in turn. Press SEL to choose the
parameter, and then shown the symbol P1 or P2, press SEL and then
shown the value of chosen parameter.
Press SEL one more time after changing the value of parameter with
display
LCD
The level value
first shown：second:
The empty value
first shown:second:
Temperature

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MOV and INC, in order to store the data.
The installation height and the full distance value are parameters must
be set up by users, and others are optional ones.
Press SEL and MOV simultaneously to exit the operating status and store
the settings.
Significance of the alphabet and the corresponding operating mode:
The operating mode
Significance
Installation height
The distance from the surface of the probe to the
bottom of the container
Level full scale
The full range corresponding to the output 20mA
The inner password
The password for inner parameter’s operating. Users do
not need to set up this parameter.
5. Calibration
The level meter should be calibrate indoor before installation to ensure the
normal performance.
General consideration
Let the probe be perpendicular to a wall, and make sure the measuring
distance is larger than the blacking distance, and no barriers within the
beam angle zone.
Wiring and connecting the instrument correctly according to the
guideline.
Turn on the power and after a few seconds the instrument will enter the
running mode. And check the level value 、the empty value and the
temperature value in turn through SEL key.
Move the probe slowly, the level value and the empty value should
change slowly accordingly.
Press SEL and MOV keys simultaneously and then enter the operating
mode. Advise the installation height value, the displayed level value
and empty value should change accordingly.
Advise the full distance value , and the output current should change,
too. Because the output current is always in accordance with the level
value.
Advise the limit value, and test with a multi-meter whether the relays
act in correct time delay.

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6. Trouble-shooting
Trouble Phenomenon
Trouble Reason
Solution
The instrument does
not show, and does not
work.
Power supply error.
Wiring error.
Check the power supply.
Check the wiring.
The instrument doesn’t
work but with show.
The sensor doesn’t aim at the liquid or the
material.
The surface has great fluctuations.
Liquid surface with lots of foam.
The container is empty and the bottom is not
flat.
Over the range.
Adjust the sensor and aim at the material.
Add a tube to the container.
Add a tube to the container
Use instrument with a lager range.
Use instrument with a lager range.
The instrument shows
unstable or the
measured value has a
great deviation.
The level enters the blanking distance.
There is strong electromagnetic interference
There is Obstruction of the ultrasonic wave.
Increase the installation height of the
instrument. or prevent the level too high.
Increase shielding to the instrument.
Change the installation site or using a
plastic tube.
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Y. Dudullu Ümraniye - İstanbul
Tel:[phone] Faks: 0216 540 7303
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