SGM LEKTRA PTU50 User manual

Technical Data
Housing material: PP
Mechanical installation: 1”GAS M; (PP ange DN100 opt.)
Protection degree: IP68
Electrical connection: IP68 male connector
with 5/10/15/20m linking cable
Working temperature: -25° ÷ +75°C
Pressure: da 0,5 a 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 reecting surfaces, the maximu
distance value will be reduced]
Temperaturecompensation: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
LCDDisplay:matrixLCDdisplay on VLW601 module (opt.)
PTU50-51-56
Ultrasonic level transmitter 825B124C
Process Controll and Measurement
 FactoryTestCerticate
In conformity to the company and check procedures I certify that the equipment:
PTU................... Production and check date: ................................
Serial n. .......................................................
is conform to the technical requirements on Technical Data and it is made in conformity to the SGM-LEKTRA procedure
Quality Control Manager .................................
Warranty
Products supplied by SGM LEKTRA are guaranteed for a period of 12 (twelve) months from delivery date according to
the conditions specied in our sale conditions document.
SGM LEKTRA can choose to repair or replace the Product.
If the Product is repaired it will mantein 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 modies, 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 consequiential 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
PTU51
PTU56PTU50

Page 2 of 20
PTU5x - Safety / Mechanical installation
1. SAFETY
1.1 Installation precaution
a) Installation shall only be performed by qualied personnel and in accordance with local governing regulations.
b) Make sure that the working temperature is between -35° and +75°C
c) Installthetransmitterin aitsphysicalcharacteristicsand housing/sensorconstructionmaterialscompatibleenvironment.
d) The transmitter must be used safety warnings observance.
e) Improper transmitter use would cause serious damage to people, to the product and connected equipment.
The non intrusive system application is now preferred in the level measurements eld. For this reason the SGM-LEKTRA
developed the PTU50,PTU51 and PTU56 unity to best meet the “GENERAL-PURPOSE” application requests. The
PTU50, PTU51 and PTU56 units are compact sensors and have a via connector quick connection. The IP68 protection
makes them suitable for external applications with direct exposure to the weather, including areas with diving hazard (up
to1m).PTU50, PTU51andPTU56are ultrasonic level transmitter, temperature-compensated and suitable for connection
with MODBUS RTU.
Non-contact level measurements
Suitable for liquids and granulates
level measurement
Integrated digital temperature sensor
to compensate the measure
MODBUS RTU communication
protocol
24Vdc power supply
Mechanical protection: IP68
1 4÷20mA analog output
2. INSTALLATION
2.1 Mechanical dimensions
The PTU50, PTU51 and PTU56 transmitter have the 1“ GAS M threaded, equipped with 1” PP xing bolt.
Also available with:
PTU50-51 - DN100 PN6 UNI 1092-1/PP ange (optional accessory)
PTU56 - DN120 PN6 UNI 1092-1/PP ange (optional accessory)
Fig.1 Fig.2 Fig.3
PTU51 PTU56PTU50
Fig.4
DN100/125 PN6 Flange
UNI 1092-1/PP
(optional accessory)

Page 3 of 20
PTU5x - Mechanical installation
2.3.2 IInstallation in nozzle
Installing the PTU50-51-56 sensor in a nozzle (see g.10), make sure the sensor
bottom protrudes at least 10 mm from the bottom nozzle
PTU50-51-56 can be installed in an extension
pipe (see Figure 11) to turn away the sensor
from the maximum level point. The extension
pipe must be at and without joints (welds,
etc..), also, the pipe terminal part must be cut
at 45° and with the borders without burr.
2.3.1 Blind distance
During installation is important to remember that in the
sensor vicinity there is a blind zone (or BLINDDISTANCE)
of0.05m (for1.5mmaxPTU50 range), 0.3m (for 6mmax
PTU51range)or0.5m(for12mmaxPTU56range)where
the sensor can not measure.
PTU50 1.5m - PTU51 6m PTU56 12m
D (mm) Lmax.(mm) D (mm) Lmax.(mm)
100 80m 125 240
125 240 150 300
150 300
Fig.10
Fig.11
Tab.2
2.3 Mounting precautions
2.3.1 Mounting position (Fig.8)
- With cambered roof, Do not install the
sensor in the tank center (b).
Leave a 300mm minimum distance
between the sensor and the tank
smooth wall (d).
- 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 “ ”) 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
Tab.1
Liquids Bulk solids
2.2 Mounting examples
Fig.5.b Fig.6
Fig.7
Fig.8
Fig.5
Lobe L d
PTU50 6m 10° 1.5m 0.2m(1.5m)
PTU51 6m 10° 6m 0.6m (6m)
PTU56 12m 10° 12m 1m(12m)
Tab.1
Fig.9

Page 4 of 20
PTU5x - Mechanical installation
2.3.4 Reference pipe installation
Disturbing factors that may inuence the level measurement in liquids, as for example:
- foam presence on the product surface (Fig.12)
- internal structures presence in the tank (Fig.13)
- presence on the liquid surface of oating bodies (Fig.14)
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
(Fig. 14-A) to allow the pipe regular lling and emptying.
In the programming menu, to the “PRODUCT” parameter, must select the “LIQUID PIPE” option (see page 7 or 11)
2.3.5 Agitators presence
The level measurement is possible thanks to the Auto-Tuned statistical lter.
Should rarely need to adjust the lter setting by editing 2 PTU50-51-56 sensor
programming parameters:
- FILTER; this parameter is present in the Quick Setup menu (page 8)
and in the Advanced Conguration “SETUP” menu (page 11);
increasing the parameter value, decreases the sensor sensitivity to the
level measurement sudden variations.
- F-WINDOW; this parameter is present in the Advanced Conguration
“SERVICE” menu (page 18); decreasing the parameter programmed
value, increases the sensor immunity to false echoes.
Fig.12 Fig.13 Fig.14
Fig.14-A
Fig.15
2.3.6 Mechanical installation accessories
Fig.16

Page 5 of 20
PTU5x - Connections and Conguration
3.2 Humidityinltrations
4. CONFIGURATION MODES
The PTU50, PTU51 and PTU56 have 2 conguration/calibration modes:
- via MODBUS RTU, by PC
- via VLW601 programming module
4.1 Via MODBUS RTU
4.1.1 MODBUS RTU PC connection (g.19)
1)PTU50, PTU51 or PTU56 with MODBUS RTU
communication protocol
2) USB/RS485 interface module, cod.694A004A
3)MODBUS RTU communication S/W, cod.010F105A (3)
With this software is possible:
- connect, by selecting the UID address, the PTU50,
PTU51orPTU56transmittersinMODBUSRTUnetwork
- read on yourPCmonitor all measures inreadingand
PTU50, PTU51 or PTU56 operation data
- programming all PTU50, PTU51 or PTU56 conguration parameters
- storing on les, data logger function; PTU50, PTU51 or PTU56 measures in reading and operating states
Fig.17
To avoid the humidity inltration inside the connector is recommended:
- Fully tighten the connector ring nut
- position the cable so that it forms a downward curve at the M20 output
(Fig. 18); in this way the condensation and/or rain water will tend to drip
from the curve bottom
Fig.18
The immunity to electromagnetic interference complies with Directives
Brown GND (0V)
Red +24Vdc
White SDA Display
Yellow + 4÷20mA
Green A (RS485)
Blue B (RS485)
Pink +3.3V Display
Grey SCL Display
Fig.19
4.3 viaVLW601conguration
WiththeVWL601display module (Fig. 20) is possible to display the measured
values and congure the PTU50, PTU51 andPTU56 sensorsoperating
parameters. The VWL601 module is equipped with matrix LCD.
displayed at the bottom indicates the correct echo signal reception
displayedat the top alertsthatthereis a generic error; press to
show the message that indicates the present error type.
The PTU50, PTU51-56 returns automatically to RUN mode.
Fig.20
OK
OK
BK
4321mm
D
!
3. CONNECTIONS
3.1 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

Page 6 of 20
The VLW601 program module has 4 buttons (g. 21) which allow to perform all operational, control and programming
instrument functions.
In the conguration menus, is possible:
a) Submenus and parameters access; press to select and press to access.
b) Parameter options choice: Press to select the option and press to store the option.
Press to exit without storing
c) Congure the parameter values; in some parameters the con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 modied (the digit is highlighted in inverse ), press to change the highlighted digits
number, press to save the set value and exit automatically. Press to exit without storing.
In the display top right, during the settings, there is always a number, eg. “1.2”. This number is the menu or
parameter index that’s displayed. The menu structure is represented on page 7 and on pages 9÷10.
OK
OK
BK
4321 mm
D
!
OK
BK
- Configuration access
- Options confirmation
- Parameters values confirmation
- Parameters values modification
OK
BK
- Exit configuration
- Back to previous menu
- Eco map (from RUN mode)
- Parameters values selection
- Parameters scroll
Fig.21
PTU5x - Conguration and Quick Start
5. QUICK START MODE
From “RUN” mode press
to access the Quick
Setup menu
OK
OK
BK
4321 mm
D
!
OK
OK
BK
SET DISTANCE 4mA 0
SET DISTANCE 20mA
MEDIUM
FILTER COEFFICIENT
BLIND DISTANCE
DISPLAY
OK
OK
BK
SET DISTANCE 4mA 0
SET DISTANCE 20mA
MEDIUM
FILTER COEFFICIENT
BLIND DISTANCE
DISPLAY
OK
OK
BK
FILTER COEFFICIENT
010
0.4
Select the parameters by
moving the cursor with ,
and conrm with ;
press to exit
WiththeVLW601module is possible to access two conguration modes for the PTU50-51-56setting:
QUICK START - Menu with easy access for quick basic parameters conguration.
To access: from “RUN” mode press to the quick setup menu mode access, to exit
ADVANCED CONFIGURATION - Full menu with access to all parameters, including functional parameters.
It is recommended to carefully read the complete documentation before accessing.
To access: from “RUN” mode, holding down , press to the advanced conguration mode access, to exit
WARNING! - The documentation provided with the PTU50-51-56 contain the most
frequently used indications. If it’s necessary refer to the full manual, it can be downlo-
aded from our website www.sgm-lektra.com , in the products section.

Page 7 of 20
PTU5x - Quick Start
Distance mm
Quick Setup
Set Distance 4mA 0
Set Distance 20mA 0
Filter Coefficient 0
Medium 0
Set Distance 4mA 0.1
0000 mm
Set Distance 20mA 0.2
0000 mm
Blind Distance 0
Prodotto 0.3
>Liquidi
Solidi
Liquidi Tubo
Display 0
Filtro 0.4
000
Zona Cieca 0.5
0000 mm
Distance mm 0.8
Level mm
Level %
Output mA
Temperature °c
Parameters DefaultValues
Liquids
20
1500mm(PTU501.5mmax)
6000mm(PTU516mmax)
12000mm(PTU568mmax)
100mm (PTU50 1.5m max)
400mm (PTU51 6m max)
600mm (PTU56 8m max)
050mm (PTU50 1.5m max)
300mm (PTU51 6m max)
500mm (PTU56 8m max)
5.1 Strutturamenùdicongurazionerapida
4mA distance
20mA distance 100%
0%
Level
measurement
PTU50-51-56
referent point
Fig.22
5.1.1 SET DISTANCE 4mA
Press to display the
distance value associated
with 4mA output.
Use and tomodifythat
value; in the Fig.22 example,
the4mAdistanceis3500mm.
Press to conrm.
5.1.2 SET DISTANCE 20mA
Press to display the
distance value associated
with 20mA output.
Use and tomodifythat
value; in the Fig.22 example,
the20mAdistanceis500mm.
Press to conrm.
5.1.3 MEDIUM
Press to display the
previous setting
Press to select the
medium type.
Press to conrm.
In fig.23 product selection
example.
SOLIDS
LIQUIDS
LIQUIDS
PIPE
Fig.23

Page 8 of 20
5.1.5 BLIND DISTANCE
Press .TheBLIND ZONE
is used to avoid undesi-
red measures near to the
transmitter
Use and tomodify the
value. Press to
conrm. The minimum value
is 50mm (PTU50), or 300mm
(PTU51)or500mm(PTU56).
5.1.4 FILTER COEFFICIENT
Press . Increasing the
valueslows down the sensor
response speed.
Use and tomodify the
value.Inputa value from 1to
99. Press to conrm.
In g.24 value choice
example.
Fast resp.
5÷10 Normal resp. 20 Slow resp. 40÷100
BLIND
DISTANCE
PTU50-51-56
Refernt point
BLIND
ZONE
Fig.24
Fig.25
PTU5x - Quick Start
5.1.8 DISPLAY
Press to access the
settings change.
With the button is pos-
sible to select the data to
display
Press to conrm.
Documentation subject to technical change with no prior warning
SGM-LEKTRA S.r.l. Via Papa Giovanni XXIII, 49 - 20090 Rodano (MI) - ITALY-
tel: ++39 0295328257 fax: ++39 0295328321
web: www.sgm-lektra.com e-mail: [email protected]
Pagesfrom9to20(fullmanual)canbedownloadedfromourwebsitewww.sgm-lektra.comintheproductssection
5.2 ECHO MAP
Pressing the BK, from RUN mode, to access directly to the echoes digital
map display, which are in PTU50-51-56 receiving (Fig.26).
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.
OK
OK
BK
BK
DIST: 721mm
12345m
DIST: 721mm
12345 m
echo signal normalization
Threshold
Distance measured
from PTU51-56 in
real time
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
6
Fig.26
Fig.27