SGM LEKTRA PTU50 Guide

PTU50/51/56
ultrasonic level transmitter
technical documentation EN Rev. D

Page 2 of 32
PTU50-51-56 - contents
CONTENTS
pag. 3
pag. 4
pag. 5
pag. 6
pag. 7
pag. 11
pag. 13
pag. 14
pag. 20
pag. 32
1-WARRANTY
2-PRODUCT
3-PERFORMANCE SPECIFICATIONS
4-DIMENSIONS
5-INSTALLATION
6-ELECTRICAL CONNECTIONS
7-LOCAL OPERATOR INTERFACE (LOI)-VL601
8-QUICK SETUP
9-ADVANCED SETUP
10-FACTORY TEST AND QUALITY CERTIFICATE

Page 3 di 32
PTU50-51-56 - warranty
Products supplied by SGM LEKTRA are guaranteed for a period of 12 (twelve) months from delivery date
according to the conditions specified in our sale conditions document.
SGM LEKTRA can choose to repair or replace the Product.
If the Product is repaired it will maintain the original term of guarantee, whereas if the Product is replaced it will
have 12 (twelve) months of guarantee.
The warranty will be null if the Client modifies, repair or uses the Products for other purposes than the normal
conditions foreseen by instructions or Contract.
In no circumstances shall SGM LEKTRA be liable for direct, indirect or consequential or other loss or damage
whether caused by negligence on the part of the company or its employees or otherwise howsoever arising out
of defective goods
1-WARRANTY

Page 4 of 32
PTU50-51-56 - features
2-PRODUCT
1. Connector
2. 1” GAS
2.1 IDENTIFICATION
Each meter has an adhesive identifi cation plate on which are the meter main data. The following picture describes the
information and data on the identifi cation plate.
1. Product code 3. Serial number2. Power supply
3. Sensor
4. PP fi xing bolt
PTU50C0A
24Vdc 20÷30Vdc
MU0031603641
2
3
1Mod.
P. S .
S.N.
44
4
11
1
22
2
2
333
PTU50 PTU51 PTU56

Page 5 di 32
PTU50-51-56 - features
3-FEATURES
Housing material
Polypropylene (PP)
Mechanical installation
1”GAS M - PP fl ange DN100/125 opt.
Protection degree
IP68
Electrical connection
IP68 male connector with 5/10/15/20m linking cable
Working temperature
-25 ÷ +75°C
Pressure
From 0,5 to 1,5 bar (absolute)
Power supply
24Vdc
Power consumption
1.5W
Analog output
4÷20mA max 750ohm
Digital communication
MODBUS RTU
Max measure range
PTU50 0.05÷1.5m; PTU51 0.3÷6m; PTU56 0,5÷12m
In case of non perfectly refl ecting surfaces, the maximum distance value will be reduced
Temperature compensation
digital in the working temperature
Accuracy
±0,2% (of the measured distance) not better than ±3mm (PTU50 ±1mm)
Resolution
1mm
Calibration
VLW601 prog. module with 4 buttons or by MODBUS RTU
Warm-up
30 minutes typical
LCD Display
matrix LCDdisplay on VLW601 module (opt.)

Page 6 of 32
PTU50-51-56 - dimensions
4-DIMENSIONS
Flange DN100/125 PN6
UNI 1092-1/PP
(optional accessories)
D: DN100 ø210; DN125 ø240
K: DN100 ø170; DN125 ø200
4.1 MECHANICAL DIMENSIONS
The PTU50, PTU51 and PTU56 transmitter have the 1“ GAS M threaded, equipped with 1” PP fi xing bolt.
Also available with:
PTU50-51 - DN100 PN6 UNI 1092-1/PP fl ange (optional accessory)
PTU56 - DN125 PN6 UNI 1092-1/PP fl ange (optional accessory)
PTU50 PTU51
PTU56

Page 7 di 32
PTU50-51-56 - installation
5-INSTALLATION
5.1 MOUNTING PRECAUTIONS
5.1.1 Mounting position
- With cambered roof, Do not install the sensor in the tank center (b). Leave a 300mm (d) minimum distance
between the sensor and the tank smooth wall.
- Use a protective cover to protect the sensor from weather and direct sunlight (c).
- Do not install the sensor near the load zone (a).
- Make sure that in the sensor emission beam (lobe “α”) there are no obstacles (f,s) that can be
intercepted as level.
- Make sure that there is not foam presence on the product surface to be measured.
5.1.2 Blind distance
During installation is important to remember that in the sensor vicinity there is a blind zone (or BLIND DISTANCE)
of 0.05m (for 1.5m max PTU50 range), 0.3m (for 6m max PTU51 range) or 0.5m (for 12m max PTU56 range) where
the sensor can not measure.
Lobo “α“
PTU50 1,5mt 5°
PTU51 6mt 5°
PTU56 12mt 5°
PTU50 0,05mt (1,5mt)
PTU51 0,3mt (6mt)
PTU56 0,5mt (12mt) Blind Distance

Page 8 of 32
PTU50-51-56 - installation
5.1.3 Installation in nozzle
Installing the PTU50-51-56 sensor in a nozzle, make sure the sensor bottom protrudes at least 10 mm from the
bottom nozzle.
PP
PTU50-51-56 can be installed in an extension pipe to turn away the sensor from the maximum level point.
The extension pipe must be fl at and without joints (welds, etc..), also, the pipe terminal part must be cut at 45°
and with the borders without burr.
PTU50 1,5mt - PTU51 6mt PTU56 12mt
D (mm) L max (mm) D (mm) L max (mm)
100 80 125 240
125 240 125 300
150 300

Page 9 di 32
PTU50-51-56 - installation
5.1.4 Reference pipe installation
Disturbing factors that may infl uence the level measurement in liquids, as for example:
- foam presence on the product surface
- internal structures presence in the tank
- presence on the liquid surface of fl oating bodies can be avoided with the use of level measurement inside of
pipes (by-pass pipe or calm pipe with 100mm min. diameter for PTU50-51, or 125mm min. diameter for PTU56)
The pipe must have a length greater or equal than the empty distance, also, must have some of vent holes to allow
the pipe regular fi lling and emptying.
In the programming menu, to the “PRODUCT” parameter, must select the “LIQUID PIPE” option
Vent hole Ø5÷10mm
Foam Internal structures Floating bodies

Page 10 of 32
PTU50-51-56 - installation
5.1.5 Agitators presence
The level measurement is possible thanks to the Auto-Tuned statistical fi lter.
Should rarely need to adjust the fi lter setting by editing 2 PTU50-51-56 sensor programming parameters:
- FILTER; this parameter is present in the Quick Setup menu and in the Advanced Confi guration “SETUP” menu;
increasing the parameter value, decreases the sensor sensitivity to the level measurement sudden variations.
- F-WINDOW; this parameter is present in the Advanced Confi guration “SERVICE” menu; decreasing the parameter
programmed value, increases the sensor immunity to false echoes.

Page 11 di 32
PTU50-51-56 - electrical connections
6-ELECTRICAL CONNECTIONS
6.1 WIRING
1) Separate the engine control cables or power cables from the PTU5x connection cables
2) Isolate unused wires of the cable.
3) Fully tighten the connector ring nut.
6.2 MOISTURE INFILTRATION
To avoid moisture infi ltration inside the connector it is recommended to:
- Screw the connector nut ring tightly by hand.
- position the cable so that it forms a downward curve; in this way the condensation and/or rain water will tend to drip
from the curve bottom
Brown GND (0V)
Red +24 Vdc
White SDA Display
Yellow +4÷20mA
Green A (RS485)
Blue B (RS485)
Pink +3.3V Display
Grey SCL Display
Brown
Green
Yellow
Grey
Red
Pink
Blue
White

Page 12 of 32
PTU50-51-56 - electrical connections
6.3 DIGITAL COMMUNICATIONS CONNECTION
6.3.1 Via MODBUS RTU
1) PTU50, PTU51 o PTU56 with MODBUS RTU communication protocol
2) USB/RS485 interface module, cod.694A004A
3) MODBUS RTU communication S/W, cod.010F105A
With this software is possible:
- connect, by selecting the UID address, the PTU50, PTU51 or PTU56 transmitters in MODBUS RTU network
- read on your PC monitor all measures in reading and operation data
- programming all confi guration parameters
- storing on fi les, data logger function; measures in reading and operating states
USB/RS485
1
2
3

Page 13 di 32
PTU50-51-56 - local operator interface (LOI) - VLW601
7-LOCAL OPERATOR INTERFACE (LOI) - VL601
LOI is an operator communications center for the METER. Through the LOI, the operator can access any
transmitter function for changing confi guration parameter settings or other functions.
7.1 VLW601 FEATURES
The VLW601 program module has 4 buttons which allow to perform all operational, control and programming
instrument functions.
In the confi guration menus, is possible:
1. Submenus and parameters access; press to select and press to access.
2. Parameter options choice: Press to select the option and press to store the option.
Press to exit without storing.
3. Confi gure the parameter values; in some parameters the confi guration is done by setting a value (eg., in the
SET DISTANCE 4mA parameter is possible to change the the corresponding distance value, in mm):
press to select the digit to be modifi ed (the digit is highlighted in inverse ), press to change the high
lighted digits number, press to save the set value and exit automatically.
Press to exit without storing.
VLW601
!
LEFT ARROW button:
• Exit configuration
• Back to previous menu
• Echo map (from RUN mode)
UP ARROW button:
• Parameter values modification
• Parameter scroll
SCROLL button:
• Cursor movement (to the right)
• Parameter scroll
ENTER button:
• Configuration access
• Options confirmation
• Parameters values confirmation
Displayed at the bottom indicates the correct echo signal reception
Displayed at the top alerts that there is a generic error; press SCROLL to show the message that
indicates the present error type.
The METER returns automatically to RUN mode.

Page 14 of 32
Quick Setup Set Distance 4mA
Set Distance 20mA
Medium
Filter Coecient
Blind Distance
Display
Set Distance 4mA
0000 mm
Set Distance 20mA
0000 mm
Filter Coecient
000
Blind Distance
0000 mm
Distace mm
Level mm
Level %
Output mA
Temperature °C
Parameter Default Values
1500mm (PTU50 1.5mt max)
6000mm (PTU51 6mt max)
12000mm (PTU56 12mt max)
Liquids
20
Distance mm
100mm (PTU50 1.5mt max)
400mm (PTU51 6mt max)
600mm (PTU56 12mt max)
050mm (PTU50 1.5mt max)
300mm (PTU51 6mt max)
500mm (PTU56 12mt max)
Medium
>Liquids
Solids
Liquids Pipe
PTU50-51-56 - quick setup
8.2 - QUICK SETUP MODE
From “RUN” mode press ENTER to access the Quick Setup menu.
Select the parameters by moving the cursor with SCROLL, and confi rm with
ENTER; press LEFT ARROW to exit.
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAY
Ź
4321
D
mm
8-QUICK SETUP
8.1 - Quick Setup menu structure

Page 15 di 32
PTU50-51-56 - quick setup
8.2.1 SET DISTANCE 4mA
Press ENTER to display the distance value associated with 4mA output.
Use SCROLL and UP ARROW to modify that value; in the example the 4mA
distance is 3500mm.
Press ENTER to confi rm.
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAY
Ź
3500 mm
SET DISTANCE 4mA
8.2.2 SET DISTANCE 20mA
Press ENTER to display the distance value associated with 20mA output.
Use SCROLL and UP ARROW to modify that value; in the example the 20mA
distance is 500mm.
Press ENTER to confi rm..
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAY
Ź
0500 mm
SET DISTANCE 20mA
100%
0%
Distance 20mA
Distance 4mA
Level measurament
Referent point
PTU50-51-56

Page 16 of 32
PTU50-51-56 - quick setup
8.2.3 MEDIUM
Press ENTER to display the previous setting
Press SCROLL to select the medium type.
Press ENTER to confi rm.
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAY
Ź
LIQUIDS
SOLIDS
LIQUIDS PIPE
Ź
LIQUIDS SOLIDS LIQUIDS PIPE

Page 17 di 32
8.2.4 FILTER COEFFICIENT
Press ENTER.
Use SCROLL and UP ARROW to modify the value. Input a value from 1 to
99.
1 maximum speed, 99 maximum slowness.
The function is deactivated with 0 (immediate response).
Press ENTER to confi rm
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAY
Ź
20
FILTER COEFFICENT
Fast resp. 5÷10 Normal resp. 20 Slow resp. 40÷100
PTU50-51-56 - quick setup

Page 18 of 32
BLIND ZONE
BLIND
DISTANCE
Referent point
PTU50-51-56
8.2.5 BLIND DISTANCE
Press ENTER. The BLIND ZONE is used to avoid undesired measures near
to the transmitter.
Use SCROLL and UP ARROW to modify the value. Press ENTER to confi rm.
The minimum value is 50mm (PTU50), or 300mm (PTU51) or 500mm (PTU56).
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAY
Ź
0250 mm
BLIND DISTANCE
8.2.6 DISPLAY
Press ENTER to access the settings change.
With the SCROLL button is possible to select the data to display
Press ENTER to confi rm.
DISTANCE 4mA
DISTANCE 20mA
MEDIUM
FILTER COEFFICENT
BLIND DISTANCE
DISPLAYŹ
DISTANCE mm
LEVEL mm
LEVEL %
OUTPUT mA
TEMPERATURE °C
Ź
PTU50-51-56 - quick setup

Page 19 di 32
PTU50-51-56 - quick setup
8.3 - ECHO MAP
Pressing LEFT ARROW, from RUN mode, to access directly to the echoes digital map display, which are in
PTU50-51-56 receiving.
This function is useful for:
- properly orient the transducer pointing.
- verify the echoes in acquisition correctness.
- identify any false echo signals that may cause measurement errors.
15432 m
D 721mm G 020 57.2KHz
The rectangle placed at the echo line base,
indicates the measurement range within which the
echo signal in reception is considered always valid
for the distance measurement. This interval value is
variable depending on the measurement conditions:
min. ± 2.5% of the measured distance.
Echo signal normalization
threshold
Measured distance from
PTU50-51-56 in real time
Measure status Echo frequency

Page 20 of 32
PTU50-51-56 - advanced confi guration
9-ADVANCED CONFIGURATION
9.1 - “SETUP” MENU
SETUP
SET DISTANCE 20mA
SET DISTANCE 4mA
MEDIUM
FILTER COEFFICIENT
BLIND DISTANCE
ACTUAL LEV 4mA
ACTUAL LEV 20mA
SET DISTANCE 4mA
0000mm
SET DISTANCE 20mA
0000mm
LIQUIDS
SOLIDS
LIQUIDS PIPE
FILTER COEFFICIENT
000
BLIND DISTANCE
0000mm
OK to conrm
9.2 - SETUP
From “RUN” mode, holding down UP ARROW, press ENTER to the
advanced confi guration mode access.
Press SCROLL to select the menu and press ENTER to access.
Press LEFT ARROW to exit.
SETUP
DISPLAY
DIAGNOSTIC
SERVICE
INFO
Ź
SET DISTANCE 4mA
SET DISTANCE 20mA
MEDIUM
FILTER COEFFICIENT
BLIND DISTANCE
ACTUAL LEV 4mA
ACTUAL LEV 20mA
Ź
3321 mm
DISTANCE
1679 mm
LEVEL