ABB LWT300 series User manual

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LWT300 series (Modbus)
Quick Start Guide
Unpacking
If you are reading this document, you have already opened the box containing your instrument. While
following the basic safety instructions provided below, proceed with unpacking the content of this box.
Basic safety
Personnel
WARNING
Only properly certified and authorized personnel should be charged with instrument
installation, electrical connection, commissioning, operation and maintenance.
Depressurize the vessel before opening the instrument connection. Any process media
released may cause severe injuries.
Carefully plan any installation, modification or repair before actually proceeding.
Electrical
WARNING
Do not make electrical connections unless the electrical code designation stamped on the
instrument data plate matches the classification of the area in which you want to install the
instrument. Failure to comply with this warning can result in fire or explosion.
Use only tools compliant with national insulation standards, e.g., DIN EN 60900.
Use only non-sparking tools when installing the instrument in hazardous areas.
Improper use
It is prohibited to use the instrument for any of the following, including but not limited to:
• A climbing aid, e.g., for mounting purposes.
• A support for external loads, e.g., as a support for pipes.
• By adding material, e.g., by painting over the name plate, or welding/soldering on parts.
• By removing material, e.g., by drilling the housing.

2Unpacking
What’s in the box
• LWT series instrument head
• Instrument coupler
• Probe and probe's hardware, if applicable (not shown in Figure 1)
• Quick Start Guide (this document)
• USB key (with user guide, safety guide, datasheet, customer data package [optional])
Should any part of the package be damaged upon reception, contact ABB customer service as indicated
on the back cover of your user guide.
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Figure 1 LWT300 series typical installation1
LWT300 head
LWT NPT coupler
Bolts (provided by client)
NPT flange (provided by client)
Gasket (provided by client)
Nuts (provided by client)
¹ The instrument head and coupler are delivered already assembled unless the remote head option was ordered.

LWT300 series (Modbus) Quick Start Guide 3
Basic physical installation
Below is a list of basic steps necessary to properly install LWT series instruments, as recommended by
ABB. All installations should be performed by certified and authorized personnel in accordance with all
applicable local security codes (electrical, engineering, etc.).
Here are the basic installation steps:
1 Access and properly secure the installation site (vessel depressurization and cool down, mains power
down, etc.).
2 Attach the probe to the head/coupler assembly (once it is attached, handle it carefully to avoid
bending the coupler/probe assembly).
3 Slide the probe in the vessel and attach the probe/coupler assembly on the flange.
4 Connect the mains to the head unit.
5 Power up and configure the instrument.
The steps indicated above are explained in more detail in the LWT series User Guide.
Simple connection diagram
Here is a simple power connection diagram for LWT series instruments installed in a non-explosive
location.
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Figure 2 Modbus connection diagram
Modbus®
Master
Device
Power supply
10.5 to 28.5 V DC
LWT Modbus®
Instrument
A (+)
B (–)
PWR
+
–
A (+)
B (–)
+
–
GND
RS-485
Communication
Link
NOTICE
Replace the temporary plastic caps with hermetic caps and/or cable glands rated for the
environment.

4Initial software setup
Initial software setup
Initial setup of the instrument is performed via the Easy Setup menu. Below you will find menu
items, factory-set values (in bold) and lists of all available values when you click Select from the Easy
Setup screen (if you need to configure your instrument for an oil & gas application, see "Configuring
instrument for oil & gas applications" on page 7 of this document).
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Figure 3 Easy Setup menu
Submenu Default value Available values
Application Category
(type of measurement performed)
Water-Based (DC>10) Water-Based (DC>10)
Liquid mix. (3<DC<10)
Oil Based (DC<3)
Solid (organic)
Solid(Others)
Interface
Set PV
(primary value measured)
Level Level
Distance
Ullage
Interface¹
Thickness¹
Interface Distance¹
PV Unit
(measurement unit for the primary
value)
in (inch) m (meter)
cm (centimeter)
mm (millimeter)
ft (feet)
in (inch)
Empty/Zero
(distance between the process
connection and the starting point of
the measuring level range; see Figure
5)
Factory-set based on full span of
probe length
Customizable
Full/Span
(the distance between the minimum
level and the maximum level; see
Figure 5)
Factory-set based on full span of
probe length
Customizable
Max Level Rate
(rate at which the vessel should reach
its maximum level)
Medium No Filter
Very Slow
Slow
Medium
Fast
Very Fast

LWT300 series (Modbus) Quick Start Guide 5
Submenu Default value Available values
Display Line1 View1
(first line of text on the first screen
displayed, under the measured value)
Level Level
Ullage
PV Percent
External Temperature
Empty
Distance
Span
Probe Length
Media Level
All menus available in your LWT instrument are explained in more detail in the accompanying user’s guide.

6Oil & gas application-specific considerations
Oil & gas application-specific considerations
The oil & gas market is the main user of Modbus guided-wave radar level transmitters. As such, specific
considerations are in order.
Mounting
• Avoid mounting the instrument's probe too close to the vessel inlet or to internal objects (15 cm [6 in]).
• If you suspect that the probe can come in contact with the nozzle, use a spacer.
Process
• Do not stack bushings to connect the coupler to the vessel (use 3-to-¾–inch NPT metal bushings
(order code A3) and 4-to-¾–inch NPT metal bushings (order code A4) on vessels with 3 in and 4 in
treaded connections.
• Ensure a good electrical connections between coupler and vessel (if metallic). Rust and corrosion
should be avoided.
– Limit the use of PTFE (Teflon™) tape as much as possible to keep a good electrical connection
between coupler, bushing and vessel.
• Avoid long nozzles (>61 cm [24 in]) (You can adjust the nozzle length in the Device Setup >
Application Setup > Nozzle Length menu).
• Avoid nozzles equipped with reducers (use of a coaxial probe is preferred in such cases).
• Avoid nozzles with a section extending inside the vessel. If it is impossible to avoid, 1) use a blocking
distance to account for all the potential ringing caused by the internal section of pipe or 2) check the
waveform for signal quality and, if still not acceptable, replace by a coaxial probe.
• For non-metallic vessels, mount the coupler on a metallic flange, a metal sheet (>15 cm [6 in] and
thick enough to support the instrument) or a 4-to-¾–inch bushing.
Changing the probe length
After changing the physical length of the probe, you must change the factory-set probe length
configured in the instrument (in the Device Setup > Application Setup > Probe Length menu).
This procedure is explained in "Changing probe length" in the LWT300 User Guide. Probe length is the
distance between the sensor reference point and the top of the weight (see Figure 4 below).
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Figure 4 Measuring the probe length

LWT300 series (Modbus) Quick Start Guide 7
IMPORTANT: The probe length value entered must be accurate to <2.5 cm (1 in).
End of probe
• To improve performance and minimize the size of the dead zone, we recommend using the puck-
shaped weight (height: 2.5 cm [1 in], diameter: 7.3 cm [2  in]) (ABB order code QP6).
• Use "long" weights ONLY if the diameter of the vessel top opening does not allow you to use of the
puck-shaped version.
Configuring instrument for oil & gas applications
The following parameters need to be configured specifically for oil & gas applications. Configuration of
these parameters is explained in more detail in the LWT300 User Guide:
• Type of application (in the Easy Setup > Application Category menu) (see "Application Category"
on page 4 of this document).
– (If the application category selected is Interface (to measure the interface between liquids, e.g.,
oil on top of water), you must set the dielectric constant (DC) of the first liquid that the pulse will
encounter (in this case, oil) in the Device Setup > Sensor Setup > Upper Media DC menu (see
"Setting the dielectric constant of upper media" in the LWT300 User Guide). (Appendix D of the
LWT300 User Guide contains a list of dielectric constants for common substances).
• Calibration parameters (Empty/Zero, Full/Span, Level Offset) (in the Calibrate > Level > Level
Calibration menu) (for details, see Figure 5 below.)
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Figure 5 Calibration parameters
Full/Span
Empty/Zero
Probe length
Sensor
reference
Ullage
Level
Distance
Level offset
+ sensor offset

8Oil & gas application-specific considerations
• Dynamic variables (in the Device Setup > Dynamic Variable > Set PV, Set SV, Set TV, Set QV menu).
The LWT instrument can monitor up to four variables. These variables are identified as primary (PV),
secondary (SV), tertiary (TV), and quaternary (QV). If you initially configured your LWT instrument
with the help of the Easy Setup menu, you have already defined the primary variable (PV). You can
also monitor three more variables.
NOTICE
As is commonly accepted practice, the first two variables (PV and SV) relate to variations on
distance measurements (Level, Distance, Ullage, Interface, Thickness, Interface Distance)
whereas the last two variables (TV and QV) allow for monitoring of additional variables
(Amplitude, Electronics Temperature, Interface Amplitude, GPC Dynamic Factor, External
Temperature [linked to pt100 external temperature sensors; see Appendix E of the LWT300
User Guide]). Available variables depend on configuration choices made elsewhere
(application category, linearization status or output type, etc.)
• Two measurement modes are available (in the Device Setup > Sensor setup > Measurement mode
menu):
– Threshold: The level detection algorithm is based on a first echo signal after the blocking distance,
which crosses the threshold value.
– Movement: The level detection algorithm is based on the movement and displacement of a valid
echo after the blocking distance. This mode is particularly useful when large false echoes are
present. (For more information about the algo parameters related to the measurement mode,
refer to "Setting the Algo Parameters" in the LWT300 User Guide).
• Parameters of application (tank type, nozzle length) (in the Device Setup > Application Setup
menu) (see "Setting up the application" in the LWT300 User Guide).
• Maximum level rate (in the Device Setup > Filtering > Max level rate menu) (see "Max Level
Rate" on page 4 of this document).
• Blocking distance (in the Device Setup > Safety Settings > Blocking Distance menu) (see
Figure 6 below) (for more information on blocking distance, refer to "Setting process safety
parameters" in the LWT300 User Guide).
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Figure 6 Blocking and safety distances
Sensor reference
point Nozzle length
Blocking distance
Safety distance

LWT300 series (Modbus) Quick Start Guide 9
Finalizing the instrument setup
• It is considered good practice to use the Reset Tracking command after modifications have been
made to an instrument setup. This is performed in the Device Setup > Sensor Setup > Reset
Tracking menu where you select OK to perform the echo tracking reset.
• At the end of the installation, it is also considered good practice to confirm proper installation by
taking a look at the generated waveform. Go to the Diagnostics > Waveform > At sensor Ref.
Point menu and check the quality of the waveform (see Figure 7 below; the waveform section close
to the reference point should not show ringing and the pulse at the level or interface distance should
be identified by the marker) (refer to "Diagnosing from a waveform" in the LWT300 User Guide).
• If you have emptied the vessel before installing the instrument, you should confirm the probe length
status (in the Diagnostics > Device Status > Probe Length Status menu) (refer to "Probe length"
in the LWT300 User Guide to make sure that the configured probe length is identical to the probe
length measured by the sensor.
NOTICE
Probe length confirmation can only be performed if the tank in which the probe is installed
is completely empty.
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Figure 7 The waveform display
12
3
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8
1Display of the level (LVL), distance (DIS), ullage (ULL) or interface (INT) value
2Display of the blocking distance (BLK), safety distance (SFD), level amplitude threshold (LAT) or interface
amplitude threshold (IAT)
Note: This is the only highlighted option that is editable (see 4)
3Level or interface marker
4Exit (8) or Edit ( ) indicator
5Zoom information
6Reference distance
7Display value selector
8Level amplitude threshold (or Interface amplitude threshold, if INT is selected in 1) marker
9Blocking distance (or safety distance, if SFD is selected in 2) marker
9

P/ N 3KXL001288U0141 Rev C
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We reserve the right to make technical changes or modify the contents of this
document without prior notice. With regard to purchase orders, the agreed
particulars shall prevail. ABB does not accept any responsibility whatsoever
for potential errors or possible lack of information in this document.
We reserve all rights in this document and in the subject matter and
illustrations contained therein. Any reproduction, disclosure to third parties
or utilization of its contents– in whole or in part–is forbidden without prior
written consent from ABB.
© ABB, 2022
ABB, Inc.
Measurement & Analytics
3400, rue Pierre-Ardouin
Québec (Québec) G1P 0B2
Canada
E-mail:
[email protected]