Hansen Technologies WLT Operating instructions

INTRODUCTION
Hansen Level Transducer Sensors are reliable, well
engineered electronic level monitoring devices. They
provide a computer compatible 4-20 mA (milliamp) output
signal proportional to liquid level. The sensor consists
of a compact, electronic transmitter in a watertight
housing assembled on top of a rugged mechanical
base. The wire element is an insulated stainless-steel
wire and can be mounted directly in a level column. If
it needs to be installed in a vessel, then an inner pipe
is required. Typical applications include: vertical
vessels, pilot receivers and pump accumulators. These
sensors are intended to be operating control device
should never be used as safety devices. The sensor
can be installed in refrigeration systems and similar
demanding applications with high pressure fluids.
All versions emit a 4-20mA analog signal via the M12
connector and field cable.
There are two different versions of transducer sensors.
WLT: 2-wire Level Transducer Sensor
WLT- C: 3-wire Level Transducer Sensor with
integrated Motorized Valve (MCV) controller.
This bulletin will cover the WLT-C which can be
used for new installations, and direct VLT + PXVC-L
replacement for MCV control. For the quick start
guide see WLT-C-QSG
ADDITIONAL FEATURES
Specifically designed for refrigeration systems.
Flexible wire element adjustable to length.
Active length up to 157” (4000mm).
One transducer sensor fits most legacy probe lengths .
Compact design minimizes shipping cost.
Direct replacement for VLT probe + PXVC-L controller.
Suitable for ammonia and Hansen approved Halocarbons .
KEY FEATURES
Specifications, Applications,
Service Instructions & Parts
W LT- C
WIRE LEVEL
TRANSDUCER SENSOR
AND CONTROLLER
Bulletin P130
December 2023
for use in 4-20 mA control
loops for refrigerant level
control and monitoring
WLT-C
WIRE LEVEL
TRANSDUCER
SENSOR AND CONTROLLER

2
P130
DECEMBER 2023
MATERIAL SPECIFICATIONS
TRANSDUCER SENSOR
Signal Output: 4-20 mA, DC, isolated
Input Power: 24 VDC or VAC ± 10%, regulated
Maximum Load Resistance: 500 ohms (1.5W)
Classification: Transmitter type/class 2U ANSI/ISA-S50.1
Enclosure: Watertight NEMA 4 (IP65)
Fitting: ¾” NPT male, connection to Level Column
Wir e Adjustable Length: 20” (510 mm) to 157” (4000 mm)
NH3 refrigerant can go down to 12” (305mm)
Safe Working Pressure (SWP): 755 psig (52 bar)
Operating Temperature:
Ambient: -22°F to +122°F (-30°C to +50°C)
Liquid: -76°F to +140°F (-60°C to +60°C)
LEVEL COLUMN
Body: 3” Schedule 40 pipe, standard
Sight Glass: Located at 50% level, standard
Safe Working Pressure (SWP): 400 psig (27 bar)
Operating Temperature: -60°F to +240°F (-50°C to +115°C )
ADVANTAGES
The electronics can be changed without opening the
refrigeration system. These sensors have internal dampening
to avert false alarms trigged by normal turbulence and
splashing of refrigerant. The 4-20mA signal is commonly
used with computers, programmable logic controllers, and
other accessories.
REMOTE DISPLAY
A milliamp meter or Hansen RDR may be
inserted in series with the 4-20mA control loop
to facilitate localized indication of the liquid level.
INSTALLATION
Level columns are required in applications where
refrigerant evaporation occurs within the vessel
being monitored; such as flooded evaporators, low
side vessels or accumulators. Using a level column
(typically 3” diameter) separates the sensor from the
boiling which occurs in the vessel. Therefore, true
refrigerant liquid level is being measured, not surges
of bubbling liquid. Level columns can be supplied by
Hansen or fabricated in the field. See page 13 for level
column details and dimensions. When the refrigerant
temperature is lower than ambient, the level column
must be insulated.
Follow good piping practice and refrigeration system
maintenance to avoid oil accumulation inside the level
column. Equalizer lines and valves should be positioned
as shown in the Level Column Piping Installation diagram
on page 3.It is recommended that a high level float
switchcutout be installed whenever practical. This
provides a nonadjustable safety control in case of
an incorrect high level setting or failure of a high level
control device.
On halocarbon systems, over a period of time, the
refrigerant in the level column will become oil rich.
An extremely high concentration of oil may cause
the original calibration to become offset, thus causing
a false reading of refrigerant level. To prevent this,
periodically remove oil from the level column.
INSTALLATION STEPS SUMMARY
See pages 4-5 for more detailed & visual installation steps .
1. Separate the electronic transmitter from the
mechanical base.
2. Determine sensor wire length. For replacement of
existing probes, lay wire element next to old probe on
ground. Match thread connection to end and cut to length.
3. Cut wire element to correct length and attach
counterweight.
4. Use the supplied programming cable and the Hansen
software tool to configure the sensor basic and advanced
settings. Connect the sensor based on model wiring
diagram.
5. Connect the cable to the electronic transmitter via
M12 connector.
6. Connect the signal cable to the MCV.
7. Install and tighten the mechanical base in the column
using non-electrically isolating pipe sealant. Attach the
electronic transmitter to the mechanical base.
8. Manually calibrate the sensor if the refrigerant is not
listed in the software.
9. Ready to use. Validate output vs actual level in column
or vessel.

3P130
DECEMBER 2023
LEVEL COLUMN PIPING INSTALLATION
(SCHEMATIC ONLY, NOT FOR CONSTRUCTION)
EQUALIZER PIPE
LINE HORIZONTAL
OR DOWN TO VESSEL
GLOBE VALVE WITH
STEM HORIZONTAL
POSSIBLE UNION
GLOBE VALVE WITH
STEM HORIZONTAL
EQUALIZER PIPE
LINE HORIZONTAL
OR UP TO VESSEL
INDEPENDENT
HIGH LEVEL
FLOAT SWITCH,
SUCH AS HLL
3/4'' (20MM) OIL
DRAIN (OPTIONAL)
HOUSING
CABLE
LEVEL COLUMN*
POSSIBLE UNION
VESSEL
(RECEIVER,
ACCUMULATOR,
OR OTHER)
OIL
DRAIN
TO
PUMPS
*ALLOW SPACE FOR INSULATION WHERE
AND AS NECESSARY, USUALLY THE LEVEL
COLUMN IS INSULATED TO REDUCE BUBBLING
1" (25 MM)
SEE-LEVEL™
SIGHT GLASS FOR
RE-CALIBRATION
1-1/4''
(32 MM)
3/4'' (20 MM) OR
PROBE TRANSMITTER
1-1/4''
(32 MM)
SENSOR CONNECTIONS
WLT-C: 3-WIRE SENSOR WITH 4-20MA OUTPUT
M12 Field Cable Connection to:
*PLC/Controller
*Power Supply
*USB Configuration Cable
“The WLT-C sensor can provide a signal to a PLC
via the M12 connection. An external power supply
is wired to the M12 connection to provide voltage
to the sensor.
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Signal cable connected to:
* MCV (motorized control valve)

4
P130
DECEMBER 2023
INSTALLATION STEPS
Follow the steps below to install, wire, configure, and
use the sensor in a level column. The sensor length is
determined by level column height.
1. To adjust the sensor wire, the following items will be
needed. The supplied 2.5mm hex key, a wrench, wire
cutters, and liquid sealant.
2. Separate the electronic transmitter from the
mechanical base.
3. Determine L = Insertion Length
Measure the level column length. Allow for a 2” (50mm)
clearance below the tip of the wire to the bottom of the
column/ tank.
4. Shorten the wire to the appropriate length with a
wire cutter.
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5. Put the wire all the way through the counter-
weight until it protrudes (1/4” to 1/2”) and tighten (approx
range 3.5-4.0in-lbs) the two set screws with the 2.5mm
hex to fix it on the wire. Do not over-tighten the screws.
Do not remove the insulation on the wire.
Once the length is determined, the electronic
transmitter can be configured.
6. Connect the M12 to USB programming cable to the
computer with the Hansen software tool installed.
The program is available at (www.hantech.com/product-list/wire-level)
7. Open the Hansen tool and press Start scanning to
initiate connection to the sensor. 3 LEDs wil display
around the M12 connector. Green, red and yellow LEDs
will flash when the communication is active.
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5P130
DECEMBER 2023
INSTALLATION STEPS - CONTINUED
8. Start the program to configure the Basic settings tab.
For the WLT-C the Control mode should automatically
be detected and the following parameters will need to
be populated. See page 9 for additional information
and settings.
• Refrigerant
• Sensor Length (“L” Dimension determined from Step #3)
• Level Column (Standpipe) Diameter Size
• Working Temperature Range
• Offset Max Level = 2.75” typical (70mm)
• P-Band = 10% typical
• I-Factor = 0 sec typical
Once complete press Save to sensor.
Note: Positioning the cursor over the selections will
provide more detailed descriptions.
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6
P130
DECEMBER 2023
9. Set up the advanced settings of the probe and save
to sensor.
10. Disconnect the programming cable. Connect the
16ft (5m) sensor field cable to the M12 connector
on the electronic transmitter. Connect the electronic
transmitter to the MCV valve and the MCV valve to the
power supply. Connect the wires per the diagrams
based on the appropriate site configuration. The
sensor output is a 4-20mA and is linear to the level.
11. Install and tighten the mechanical base in the level
column. Use non-electrically isolating pipe sealant
for the 3/4” NPT connection. Do not use Teflon tape.
12. Install and tighten the electronic transmitter to the
mechanical base.
13. If the refrigerant is not listed in the software, then
manually calibrate (See page 12).
14. Ready for use.
Recomended settings:
Ramp startup = 5
Valve speed open = 5
Valve speed Closed = 5
Min valve opening = 0
Max valve opening = 100
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7P130
DECEMBER 2023
TYPICAL WIRING: NEW INSTALLATIONS AND DIRECT REPLACEMENT OF VLT +PXVC-L
WLT-C TO PLC WITH INTEGRATED POWER SOURCE AND MCV: 3-WIRE 4-20MA OUTPUT
WLT-C TO CONTROLLER/PLC WITH EXTERNAL POWER SOURCE AND MCV: 3-WIRE 4-20MA OUTPUT
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8
P130
DECEMBER 2023
SETUP USING A SPLITTER BOX
When using a splitter box it is possible to run
the refrigeration system and connect a PC to the sensor
at the same time. The splitter box is not suited
for normal operation, but only for installation and
modification. The splitter box is connected to the
M12 plug on the WLT-C sensor and then both the pc
and the normal M12 plug can be connected. See wiring
diagram below.

9P130
DECEMBER 2023
HANSEN SOFTWARE TOOL DETAILS
Software Available on Hansen Website:
www.hantech.com/product-list/wire-level
CONNECTING TO THE SENSOR
The sensor is connected to a laptop using the
programming cable which contains a USB connection
at one end and the M12 connection at the opposite end.
The USB/M12 programming cable is 5ft (1.5m) long. If
a longer cable is desired, a 33ft (10m) extender cable
(WLT-M12 EXTENSION) is available that connects directly
in series with the M12 connector. The laptop will contain
the Hansen Configuration tool. The Start scanning
button looks for a connected sensor and determines
the model. Once detected, the WLT tool application
will flash 3 LEDs around the M12 connector. Green, red
and yellow LEDs will flash when the communication
is active.
SETTING UP THE SENSOR
The Hansen software tool has three configuration
tabs: Basic settings, Advanced settings, and
Diagnostics/Calibration. The Basic settings screen
consists of the necessary selections for all sensors. The
Advanced settings screen allows for the adjustment
of alarms. The Diagnostic screen displays the
sensor readings and allows for manual calibration.
Some fields will be shown in gray when they are not
relevant/active with the chosen setting. Detailed
explanations of the individual fields will show up when
the mouse is moved over the field. A setting can be
changed by typing in a new value or by selecting in the
drop down. After changing the value, it is stored to
the sensor by clicking ”Save to sensor”. It remains in
the sensor even when the power supply is disconnected.
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SETTING UP THE SENSOR: LEVEL / CONTROL
The sensor can operate in two different modes. The
basic and advanced settings automatically adjust based
on the identified mode.
• Level: A level input to a PLC, computer or other device
that uses the analog signal (WLT)
• Control: A direct controller of a motorized valve based
on the level. (WLT-C)
ADJUSTING SETTINGS
Settings can be modified through the drop-down and
input boxes or by loading a new settings file. To create
a new sensor file, do not connect to the sensor, open
the Hansen Tool, and the steps are as follows:
Simulating tools WLT tool update desired fields
To save the file:
Advanced Settings Save Settings file Save to folder
To load the file:
Connect programming cable to sensor open Hansen
Tool Start scan for sensor Advanced Settings 
Load Setting file Save to sensor Basic Settings
Save to sensor
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10
P130
DECEMBER 2023
BASIC SETTINGS: CONTROL (WLT-C)
The Basic Settings screen contains the necessary
selections for all sensors. When connected to the
sensor, some settings are grayed out and cannot
be changed. If changes are desired, see Adjusting
Settings on page 9.
Setpoint level in% (control mode only) Desired level:
Shows the percentage level that one wants to maintain
in the vessel or the level indicator.
P-band in% (control mode only) Proportional band:
Control area that describes how much the valve should
open, dependent upon the deviation from the desired
level. If proportional band is set to 10%, for example,
a liquid level that is under 5% will make the valve open
50%; the valve will open to 100% if the level is under
10%. Small proportional band results in a system which
reacts quickly, while a large proportional band results
in a system that reacts more slowly.
I-Factor in sec (control mode only) I value in controller:
A small number will make the controller faster, and a
large number will make the system slower. If you type 0
the controller will work as a P controller.
Filter time constant in sec.: Filter function: Filter
time averages the output over a period (in seconds) and
reduces fluctuations that can lead to unstable control.
Recommended to leave at default value of ”20” seconds.
Alarm setting in %: The vessel level % set point off
which the alarm LED will trigger.
Offset max/min level: Allows for the reduction of the
measured maximum and/or minimum level. Based on
the sensor design the typical max value is 2.75” (70mm).
Example (Max): 10ft (3058mm) high level column and full
indication desired at 9.5ft (2987mm), then 71mm would
go on the box.
Select mechanical type: All current Hansen probes
are version ”Wire Sensor V3”.
Refrigerant: Indicates the refrigerant type. If medium is
not in the list, select ”Not Specified” and a manual
calibration will have to be performed.
Sensor Length: The measurement length of the wire
assembly. The value that was determined in step 3 on
page 4.
Standpipe (Level Column) size in inch: The diameter
of the level column.
Working Temperature in degrees: The refrigerant
operating temperature range. Hover over the drop-down
to view Fahrenheit conversion.