Thank you for purchasing an LOE Ultrasonic Level Sensor and Web Enabled Controller from APG. We
appreciate your business! Please take a few minutes to familiarize yourself with your LOE and this manual.
The LOE Ultrasonic Level Sensor and Web Enabled Controller oers a wide degree of integrated, exible,
remote and local control and monitoring for your system. The LOE can control up to 10 APG Modbus
sensors--any combination of level, pressure, magnetostrictive and ultrasonic--and two input or output
relay terminals. All readings are available for control and monitoring via TCP/IP for local or remote network
access. The LOE also had exible power options: it can use either POE or an independent 12-28 VDC power
source.
Reading your label
Every APG controller comes with a label that includes the controller’s model number, part number, and
serial number. The LOE label also indicates the default IP address, subnet mask, and mac address. Please
ensure that the model number on your label matches your order.
Operating Range 0.6 - 15.0 ft. / 7 in. - 180 in. / 178mm - 4572mm (6126)
1.0 - 25.0 ft. / 12 in. - 300 in. / 305mm - 7620mm (2126)
1.5 ft. - 40 ft. / 18 in. - 480 in. / 458mm - 12192mm (3136)
Beam Pattern 9° o axis
Transducer Frequency 43 kHz (3136) / 69 kHz (2126, 6126)
Response Time Programmable, 5 Hz maximum (200 ms)
Communications
Digital Output Ethernet TCP/IP Modbus
Ethernet TCP/IP via embedded webserver (LAN only)
Ethernet TCP/IP to APG-provided website
0-2 Isolated Solid State Relays
Inputs RS-485 Modbus (up to 10 slave sensors)
0-2 Discrete Switches
Electrical
Operational Supply Voltage (at sensor) 48 VDC via POE (requires injector or switch)
12-28 VDC
Current Draw 40 mA @ 48 VDC
80 mA @ 24 VDC
Power Rating (LOE) 2.0 W Max
Isolated SS Relays 120V, 120 mA Max
Accuracy
Accuracy ±0.25% of detected range
Resolution 0.1 inch (2.54 mm)
Environmental
Operating Temperature -40 to 60°C (-40 to 140°F)
Internal Temperature Compensation Yes
Enclosure Protection IP65
NOTE: Power terminals for 24V and
GND can only be used to power Modbus
sensors if LOE is powered via POE.
If LOE is powered via 12-28 VDC supply,
Modbus sensors must be powered
independently.
LAN + DCLAN
POWER
POE
Power
Injector
24V BA GND
RS-485
Terminal inside housing
supplies 24 Vdc to power
attached Modbus devices
NOTE: Power terminals for 24V and
GND can only be used to power Modbus
sensors if LOE is powered via POE.
If LOE is powered via 12-28 VDC supply,
Modbus sensors must be powered
independently.
TR1TR1TR2TR2
Use shielded cable
Note: Terminating resistor size recommended
based on input resistance of LOE. Length
of cable and overall impedence of network may
• Mount your LOE sensor so that it has a clear, perpendicular sound path to the surface being monitored. Your sensor should be mounted away from tank or vessel walls and inlets. (See Figure 2.1)
• The sound path should be free from obstructions and as open as possible for the 9° o axis beam
pattern.
• If you are using a stand pipe, please see our guide to stand pipes on our website:
Initial setup of the LOE and individual Modbus sensors is done via an embedded web server. The embedded
server can be accessed by using either the serial number or local IP address of the LOE and a web browser
(Internet Explorer, Chrome, Firefox, etc).
NOTE: Port 6700 must be open on your local network for the LOE to connect.
Accessing LOE Embedded Web Server via Serial Number
The easier way to access the embedded web server is to type loe_xxx into a web browser on a computer
connected to the same local network as the LOE. xxx represents the numeric portion of the LOE’s serial
number. See Figures 2.2 and 2.3.
Figure 2.2
Figure 2.3
NOTE: If your web browser performs a web search for “loe_xxx” istead of accessing the
server, type “http://loe_xxx”.
Some networks will block this direct access to the LOE. If this is the case, you will need to use the IP address
of your LOE to access the embedded web server. The IP address can be obtained two ways: ask your local
network administrator, or logon to your APG-provided website, www.levelandow.com.
Accessing LOE Embedded Web Server via Local IP Address
Log on to your APG-provided website, and a list of sites will be displayed on your screen (see Figure 2.4).
Select the site where the new LOE is installed. From the list of sensors at thie site, select the sensor with the
serial number that matches the new LOE. (See Figure 2.5)
the IP Address of the newly installed LOE. (See
Figure 2.6.)
Type the LOE’s IP address into your browser’s
address bar (See Figure 2.7).
Figure 2.6
Figure 2.7
NOTE: For further information on using your APG-provided remote website, please
visit www.apgsensors.com/support for a user manual, or contact us at 1-888-525-7300.
Logging on to the LOE Embedded Web Server
The LOE’s embedded webpage should now be open, showing the Main Display page (See Figure 2.8). This
page lists the LOE, any Modbus sensors attached to the LOE, and displays each sensor’s current reading.
The LOE is displayed as sensor #11. The congured sensor number for each Modbus sensor will show as its
Sensor Number. Every new Modbus sensor defaults to sensor number 1.
Figure 2.8
IMPORTANT: Multiple Modbus sensors added to the network simultaneously are all
assigned the same sensor number: 1. Sensors must be added to the network individually.
Click on Home to bring up the Menu page (See Figure 2.9). The rst menu link clicked during each session
will prompt a User Name and Password login for the LOE (See Figure 2.10). The default User Name is admin,
and the default Password is password.
Figure 2.9Figure 2.10
NOTE: See the Security Setting Menu (Page 37) to change this user name and pass-
word.
Assigning Modbus Senor Numbers
Click on RS-485 Network Settings to bring up the RS485 Settings page (See Figure 2.11). See section RS-485
Network Settings for a full description of each parameter in this menu (Page 38).
Change Numb of Sensors On Line to reect the total number of Modbus sensors you will be connecting to
your LOE. Click Change (or press Enter) to send the new value to the LOE.
With Sensor Number to View set to 1 (for the latest sensor added to the Modbus network), set New Sensor
Number to the highest available number. Click Change (or press Enter) to send the new value to the LOE.
Repeat this process for each Modbus sensor as it is added to the network.
NOTE: If you control the power to each Modbus sensor seperately, powering up a new
sensor after assigning a Modbus address to the previous sensor will allow you to assign
an address to the new sensor without leaving the RS845 Settings Menu.
IMPORTANT: None of parameters in the RS485 Settings menu automatically update.
Each one must be manually congured.
• Removal Instructions
• Disconnect power to the LOE rst.
• Disconnect network connection.
• Disconnect any sensors, relays, and switched inputs.
• Remove the LOE and store it in a dry place, at a temperature between -40° F and 180° F.
Using the LOE’s IP address, and port number 502, readings can be polled from the LOE for any attached
sensors via RS-485 Modbus commands. Up to 14 16-bit Input Registers, beginning with register 299, can be
polled with a single command. Below is a sample Modbus command illustrating the necessary syntax.
Example:
00 01 : Transaction Identier
00 00 : Protocol Identier
00 06 : Message Length (6 bytes to follow)
0B : The Reporting Unit Identier [sensor number] (0B hex = 11)
04 : The Function Code (04 = read Input Registers)
01 2E : The Data Address of the rst register requested. (12E hex + 1 = 303)
00 02 : The total number of registers requested. (read 2 registers, i.e. 303 to 304)
Byte order (hex values)
00 01 00 00 00 06 0B 04 01 2E 00 02
Notes:
• Reporting Unit indicates the sensor reading being polled from the LOE, in hex. 01 - 0A are for Modbus
sensors 1 - 10 attached to the LOE. 0B (i.e. sensor 11) reads the values from the LOE sensor (See Figure
2.8). Unused registers (i.e., those not associated to an attached sensor) will return zeros when polled.
• Function Code 04 reads the Input Registers. No other functionality (e.g., polling from or writing to Holding Registers) is supported via Modbus TCP/IP with the LOE. Complete control functionality is available
through the embedded web server and through your APG-provided website (www.levelandow.com).
• Data Address of registers, decimal to “hex minus 1” conversion:
Decimal Address Hex minus 1 Decimal Address Hex minus 1
30299 Sensor Type
30300 Distance/Level 1, Top (in mm, unsigned)
30301 Distance/Level 2, Bottom (in mm, unsigned)
30302 Sensor Temperature Reading (in 0C, signed)
30303-30304 Calculated 1 (raw)
30305-30306 Calculated 2 (raw)
30307 (upper bits) Version
30307 (lower bits) Signal Strength
30308 Battery Voltage
30309 (upper bits) Sensor Trip 1 Alarm
30309 (lower bits) Sensor Trip 1 Status
30310 (upper bits) Sensor Trip 2 Alarm
30310 (lower bits) Sensor Trip 2 Status
30311 (upper bits) Sensor Trip 3 Alarm
30311 (lower bits) Sensor Trip 3 Status
30312 (upper bits) Sensor Trip 4 Alarm
30312 (lower bits) Sensor Trip 4 Status
This is the list of generic Input Registers for polling the LOE and any connected sensors. Actual registers
used vary by sensor. Please see the user manual for each sensor for a full and accurate list of registers.
NOTE: For more information about Modbus RTU, please visit www.modbus.org.
The LOE does NOT support full Modbus programming of attached sensors. Full control and conguration of
individual sensors is supported through the LOE’s embedded web server and through your APG-provided
webpage, www.levelandow.com.
NOTE: For any APG sensor user manual, please visit http://apgsensors.com/support.
Chapter 4: LOE Embedded Web Server
• Accessing the LOE Embedded Web Server
See the Software Setup section of chapter 2 (pages 9 - 11) for instructions for accessing and signing into the
LOE embedded web server.
• Navigating the LOE Embedded Web Server
The LOE embedded web server has two primary screens--the Main Display Page (Figure 4.1) and Menu Page
(Figure 4.2)--and a screen for each of 9 submenus. The submenus can be understood in three groups:
Full Distance sets the distance from the LOE sensor Zero Point (See Figures 4.5 - 4.7) to the full level of the
vessel being monitored. Not used when Application Type is set to 0 (Value).
PARAMETER RANGE
Empty Distance 0 - Sensor Maximum
Empty Distance sets the distance from the LOE sensor Zero Point (See Figure 4.5 - 4.7) to the empty level of
the vessel being monitored. Not used when Application Type is set to 0 (Value).
PARAMETER RANGE
Application Type0 = Value (Distance)1 = Level
2 = Volume of Standing Cylindrical Tank with or without Hemispherical Bottom
3 = Volume of Standing Cylindrical Tank with or without Conical Bottom
4 = Volume of Standing Rectangular Tank with or without Chute Bottom
5 = Volume of Horizontal Cylindrical Tank with or without Spherical Ends
6 = Volume of Spherical Tank
7 = Pounds (Linear Scaling)
8 = User Dened Units
9 = Volume of Vertical Oval Tank
10 = Volume of Horizontal Oval Tank
11 = Polynomial (Strapping Chart)
Application Type is used to choose the parameter conguration to convert the distance of Distance into the
congured reading on the Main Display Page (See Figure 4.1; also, Calc Dist,Level,Volume on Figure 4.4). After
selecting an Application Type and clicking “Change” or pressing Enter, the Application Parameters menu updates to reect the parameters of the chosen application.
See Tank Parameters for an explaination of each Application Type and its associated parameters.
0 - Distance Parameter 1 Not Used
Parameter 2 Not Used
Parameter 3 Not Used
Parameter 4 Not Used
Parameter 5 Not Used
Distance (factory default) measures the distance from the Zero Point of the
LOE sensor to the target surface.
Application Type Tank Parameter Function
1 - Level Parameter 1 Not Used
Parameter 2 Not Used
Parameter 3 Not Used
Parameter 4 Not Used
Parameter 5 Not Used
Level calculates the depth (level) of the vessel being monitored, based on the
Full Distance and Empty Distance.
Level
Application Type Tank Parameter Function
2 - Standing Cylindrical Parameter 1 Tank Diameter
Tank with Parameter 2 Bottom Radius
Hemispherical Parameter 3 Not Used
Bottom Parameter 4 Not Used
Parameter 5 Not Used
3 - Standing Cylindrical Parameter 1 Tank Diameter
Tank with Parameter 2 Bottom Radius
Conical Parameter 3 Cone Length (Height)
Bottom Parameter 4 Not Used
Parameter 5 Not Used
Application Type Tank Parameter Function
4 - Standing Rectangular Parameter 1 Tank X Dimension
Tank with Parameter 2 Tank Y Dimension
Chute Parameter 3 Chute X Dimension
Parameter 4 Chute Y Dimension
Parameter 5 Chute Length (Height)
Empty
Distance
Empty
Distance
Diameter
Cone
Diameter
Tank X
Full
Distance
Cone
Length
Full
Distance
Application Type Tank Parameter Function
5 - Horizontal Cylindrical Parameter 1 Tank Length
Tank with Parameter 2 Tank Diameter
Spherical Ends Parameter 3 Radius of Ends
Parameter 4 Not Used
Parameter 5 Not Used
6 - Spherical Tank Parameter 1 Tank Diameter
Parameter 2 Not Used
Parameter 3 Not Used
Parameter 4 Not Used
Parameter 5 Not Used
Application Type Tank Parameter Function
7 - Pounds Parameter 1 Multiplier
(Linear Scaling) Parameter 2 Unit Denition (label)
Parameter 3 Not Used
Parameter 4 Not Used
Parameter 5 Not Used
Pounds allows for a multiplier (Parameter 1) to be applied to the calculated
level measurement, creating a linear scalar as the output to congured reading on the Main Display Page. Such a multplier could convert the distance or
level measurement of a tank with simple geometry into a measurement of
weight.
Empty
Distance
Diameter
Full
Distance
Application Type Tank Parameter Function
8 - User Dened Units Parameter 1 Not Used
Parameter 2 Not Used
Parameter 3 Not Used
Parameter 4 Not Used
Parameter 5 Not Used
User Dened Units is not used by the LOE. Application Type 8 can be selected,
but after leaving the Application Parameters Menu, Application Type reverts
to 0.
Application Type Tank Parameter Function
9 - Vertical Oval Parameter 1 Tank Length
Distance
Tank Parameter 2 Tank Depth
Parameter 3 Tank Width
Parameter 4 Not Used
Parameter 5 Not Used
Sensitivity sets the level of gain that is applied to the echo. When operating in AutoSense, Hard-Target, or
Soft-Target (see Gain Control), Sensitivity sets an upper limit for the amplication that can be applied to the
echo. If operating in Manual, this parameter sets the gain.
When using manual gain control, set Sensitivity to the minimum value that will allow the target to be reliably
tracked through the full range of expected environmental conditions.
IMPORTANT: Parameter values stored on the LOE will not update until the “Change”
button is clicked or the Enter key is pressed.
PARAMETER RANGE
Blanking Determined by sensor model
Blanking sets the blanking distance, which is the zone from the Zero Point of the sensor to the point from
which the rst echo will be accepted. While blanking distance can be used to ignore unwanted targets--such
as welds, seams, pipe ttings, or gaskets--between the sensor and the closest acceptable target level, such
objects generally create additional reections and echoes, which are hard to lter out. More often, blanking
distance is used for a sensor installed in a stand pipe.
Because of the physical properties of an ultrasonic sensor, objects cannot be detected closer than
approximately 1 foot from the face of most transducers (5 inches for LOE-7126, 7 inches for LOE-6126).
However, this distance varies according to how much energy is being transmitted (Pulses) and the
installation.
IMPORTANT: Blanking is always measured from the Zero Point of the sensor. See Fig-
Pulses sets the maximum number of pulses the sensor can transmit when operating in AutoSense, Hard-
Target, or Soft-Target (see Gain Control), or sets the number of pulses when operating in Manual. The more
pulses that are sent in a burst, the stronger the returning echo.
When operating in Manual, increase the strength of the transmission by increasing Pulses for detecting soft
targets in damping environments. In acoustically active environments or small enclosed areas, decrease
Gain Control selects the control mode for the LOE sensor’s gain settings (Sensitivity and Pulses). In AutoSense,
the sensor automatically adjusts the sensitivity and pulses for the best quality return signal. Manual, Hard
Target, and Soft Target are user controlled scenarios. In Manual, the user is in full control of Sensitivity and Pulses. For Hard and Soft Target, the user sets maximum Sensitivity and Pulses, but the overall gain is either
ramped up slowly (Hard Target) or quickly (Soft Target) by the sensor.
PARAMETER RANGE
Average 1-32
Average sets the number of qualied samples to average for the displayed reading. Qualied samples are
placed in a rst-in, rst-out buer, the contents of which are averaged for Distance. The larger the number of
qualied samples being averaged, the smoother the Distance reading will be, and the slower the reading will
be to react to quick changes.
Window determines the corresponding physical range for qualied samples, based on the current Distance.
Samples beyond the +/- Window range of the current Distance will not qualify unless the average moves.
Samples outside the extents of the Window are written to the Out of Range Samples buer. (See Figure 4.8.)
Example:
Window = 6 Inches
Out of Range Samples = 10
All samples
Samples are rejected within
this area unless they persist
for 10 consecutive samples
Min. ReadingMax. Reading
Current value
of Distance
are accepted
within this area
6”6”
Samples are rejected within
this area unless they persist
for 10 consecutive samples
Figure 4.8
PARAMETER RANGE
Out of Range Samples 0-250
Out of Range Samples sets the number of consecutive samples outside the Window necessary to automatically adjust the current Distance and move the Window.
PARAMETER RANGE
Sample Rate 1 - 20 Hz
Sample Rate is the number of sample readings taken by the LOE every second.
PARAMETER RANGE
Multiplier 0 - 1.999
Multiplier is used to calibrate the LOE sensor for variations in the speed of sound due to variations in
atmospheres. The default of 1.000 is used for most applications.
PARAMETER RANGE
Temp Comp. 0 = O
1 = On
Temperature Compensation activates or deactivates the LOE’s internal temperature compensation circuit.
The speed of sound changes with changes in temperature, therefore changes in temperature can aect
distance measurements. These eects can be minimized by activating temperature compensation.
Oset is used to change the Zero Point of the LOE sensor. The Zero Point of the sensor is the point from
which the calculated distance is measured. When the Oset is set to 0, the Zero Point of the sensor is at the
face of the transducer (See Figure 4.5). A positive setting will move the Zero Point forward, in front of the
sensor face (See Figure 4.6). Setting the Oset to a negative number will move the Zero Point backward,
behind the sensor face (See Figure 4.7).
In all cases, Blanking is measured from the end of Oset, and the eective measurement zone of the sensor
begins at the forward end of Blanking. If Oset is more negative than Blanking is positive, the net dierence
will be a loss in sensor maximum range (See Figure 4.7).
PARAMETER RANGE
Max Distance Determined by sensor model
Maximum Distance sets the maximum acceptable signal range (up to the physical maximum of the sensor), measured from the Zero Point. Signals beyond the Maximum Distance are ignored. Under Loss of Echo conditions, the Distance reading will display the Maximum Distance.
LOE Readings
Figure 4.9
Reading Type Range
Distance Determined by model
Distance displays the distance from the sensor to the detected target in the units selected in the Units
parameter in the Application Parameters Menu (See Figure 4.3). This reading is always Distance, regardless
of the Application Type selected in the Application Parameters Menu. Distance is used for Average and
Window.
Reading Type Range
Calc. Dist,Level,Volume Determined by vessel being measured
Calc. Dist,Level,Volume displays the congured output of the sensor. This is also shown on the Main Display.
Calc. Dist,Level,Volume is used for Trip measurements.
Signal Strength displays the strength of the signal being received by the sensor. 0 represents the lowest
quality signal, and 100 represents the highest quality.
Reading Type Range
Temperature
Temperature displays the current temperature of the thermal device in the LOE sensor body.
LOE Trip Outputs and Settings
Figure 4.11
Figure 4.10
The LOE can have up to 2 output relays that can be congured to turn on or o based on the Calc.
Dist,Level,Volume reading of the sensor.
Trip Type Outputs are congured with two independent digits: the rst for Alarm Type (Blank, 1, or 2), and
the second for Trip Condition (0-5, 7, or 9).
PARAMETER RANGE
Trip Distance 0 - Sensor Max Distance
Trip Distance sets the value of the primary trip position, which is closest to the Zero Point of the sensor.
PARAMETER RANGE
Trip Window 0 - Sensor Max Distance
Trip Window sets the value from the primary trip position to the secondary trip position, which is farther
from the sensor’s Zero Point.
Alarm Type
Blank_ - No Alarm
Designates that no alarm is to be activated or deactivated on the remote APG-provided website (i.e., www.
levelandow.com) for the indicated Trip Condition. To initiate only the visual Trip Status indicator (See
Figure 4.11) for Trip Condition 3, Trip Type would be set to 3.
Designates the active trip point as a web alarm condition.
To initiate web alarm whenever the Trip Condition 3 is ON,
Trip Type would be set to 13.
TRIP TYPE 0
NEAR
ON
OFF
Alarm Type
2_ - Inactive Alarm
Designates an inactive trip point as a web alarm condition.
TRIP TYPE 1
EXCLUSIVE
ON
OFF
ON
To initiate a web alarm whenever the Trip Condition 3 is
OFF, Trip Type would be set to 23.
ON
OFF
OFF
ON
Trip Condition
0 - Near
Near activates the Trip whenever the Calc. Dist,Level,Volume
is less than the Trip Distance setting.
TRIP TYPE 2
HYSTERESIS
NEAR
TRIP TYPE 3
FAR
ON
OFF
Trip Condition
1 - Exclusive
TRIP TYPE 4
INCLUSIVE
OFF
ON
OFF
Exclusive activates the Trip whenever the Calc.
Dist,Level,Volume is less than the Trip Distance setting OR greater than the Trip Distance + Trip Window settings.
Trip Condition
2 - Hysteresis Near
TRIP TYPE 5
HYSTERESIS
FAR
OFF
OFF
ON
ON
Figure 4.12
Hysteresis Near activates the Trip whenever the Calc. Dist,Level,Volume
becomes less than than the Trip Distance setting. The Trip remains activated until the Calc. Dist,Level,Volume
becomes greater than the Trip Distance + Trip Window settings. The Trip then remains o until the Calc. Dist,Level,Volume becomes less than the Trip Distance setting again.
Trip Condition
3 - Far
Far activates the Trip whenever the Calc. Dist,Level,Volume is greater than the Trip Distance setting.
Trip Condition
4 - Inclusive
Inclusive activates the Trip whenever the Calc. Dist,Level,Volume is greater than the Trip Distance setting AND less than the Trip Distance + Trip Window settings.
Hysteresis Far activates the Trip whenever the Calc.
Dist,Level,Volume becomes greater than the Trip Distance +
Trip Window settings. The Trip remains activated until the
Calc. Dist,Level,Volume becomes less than the Trip Value
setting. The Trip remains o until the Calc. Dist,Level,Volume
becomes greater than the Trip Distance + Trip Window
settings again.
Loss of Echo activates the output when the maximum
calculated reading is reached.
TRIP TYPE 0
NEAR
TRIP TYPE 1
EXCLUSIVE
TRIP TYPE 2
HYSTERESIS
NEAR
TRIP TYPE 3
FAR
TRIP TYPE 4
INCLUSIVE
TRIP
DISTANCE
ON
ON
ON
OFF
OFF
TRIP
WINDOW
OFF
OFF
ON
OFF
ON
ON
ON
OFF
OFF
Trip Condition
8 - Timed Interval
Timed Interval activates the output for a set amount of
TRIP TYPE 5
HYSTERESIS
FAR
seconds every set amount of minutes (See Figure 4.13).
When Trip Type is set to 8, Trip Distance and Trip Window
are changed to “Interval Time (minutes)” and “On Time (seconds)”.
Trip Condition
9 - Abrupt Change
“ON” TIME
(in seconds)
Abrupt Change activates the output whenever a user-
dened maximum rate of level change (change in distance
or level divided by elapsed time) is exceeded. Trip Distance
denes the distance and Trip Window denes the time.
The LOE can have up to 2 input relays that can be tied to alarms on the remote APG-provided website. There
are three alarm congurations for Trip Inputs: Alarm On on Input, Alarm O on Input, and Relay On Time
Check Limit.
Alarm Type
18 - Alarm on ON Trip Input
Alarm on ON Trip Input activates the alarm when the input circuit is closed.
Alarm Type
28 - Alarm on OFF Trip Input
Alarm on OFF Trip Input activates the alarm when the input circuit is opened.
Alarm Type
30 - Relay On Time Check Limit
Relay On Time Check Limit generates an alarm when the input circuit has been closed past the time limit
(in seconds) set in the Trip Dist (See Figure 4.14). Trip Window contains a running counter of the time (in
seconds) the input circuit has been closed. The counter is cleared when the input circuit opens.
The LOE embedded web server includes one parameter, a button, and two status reports for
communication with the remote APG-provided website (i.e., www.levelandow.com).
PARAMETER RANGE
Retry Time 30 - 180 Seconds
Retry Time sets the time delay (in seconds) between attempts by the LOE to contact the external website.
BUTTON
Call In
Call In forces the LOE to call in to the external website.
DISPLAY RANGE
Remote Call in Time 1 - 86400 Seconds
Remote Call in Time displays the duration of the last communication between the LOE and the external
website.
DISPLAY RANGE
Remote Bytes 8 or 160 Bytes
Remote Bytes displays the number of bytes of data sent in the last communication between the LOE and the
external website. 8 bytes indicates a normal, successful transmission. 160 bytes indicates an error occured
This menu shows the contents of the rst set of Holding Registers for the selected Modbus sensor (See
Figure 2.8). The register names and value restrictions are automatically congured for the type of sensor
detected (See Figure 4.16). Because register name and use varies by sensor, including a full breakdown of
the registers in this manual would be counterproductive. Please see the user manual for each sensor for a
full list of registers.
This menu shows the contents of the second set of Holding Registers for the selected Modbus sensor (See
Figure 2.8). The register names and value restrictions are automatically congured for the type of sensor
detected (See Figure 4.16). Because register name and use varies by sensor, including a full breakdown of
the registers in this manual would be counterproductive. Please see the user manual for each sensor for a
full list of registers.
The Network Settings are provided for advanced users only and should not normally require changes. Each
LOE ships with the DHCP enabled, which means it will automatically connect to the the APG-provided remote website (usually www.levelandow.com) and congure its own Network Settings when plugged into a
The RS-485 (Modbus) Settings menu controls the settings for the Modbus sensors (up to 10) attached to the
LOE.
PARAMETER RANGE
Baud Rate Checkbox 9600 Baud
Baud Rate Checkbox is used to select the baud rate of the of the sensors connected to the LOE. All APG
Modbus sensors communicate at 9600 Baud.
PARAMETER RANGE
Numb of Sensors On Line 0 - 10
Numb of Sensors On Line sets the number Modbus sensors connected to the LOE. This setting is not automatically populated or updated. The user must change the setting manually. Numb of Sensors On Line
must always be equal or greater than the number of actual sensors attached to the LOE.
NOTE: For best results, set Numb of Sensors On Line to the highest number of num-
ber of sensor TO BE connected. No further adjustments will be needed as those sensors
are connected to the LOE.
PARAMETER RANGE
Sensor Number to View 1 - 10
Sensor Number to View selects number of the sensor for the LOE to poll for populating the Main Menu and
for editing parameters in the Modbus Holding Register menus.
PARAMETER RANGE
New Sensor Number 0 = No Change
1 - 10
New Sensor Number changes the sensor number assigned to the sensor selected by Sensor Number to View.
IMPORTANT: When “Change” is pressed to assign a new sensor number, Sensor Num-
ber to View DOES NOT update.
PARAMETER RANGE
RS485 Sample Rate 1 - 20 Seconds
RS485 Sample Rate determines how often the LOE polls the selected Modbus sensor.
Your LOE series controller is very low maintenance and will need little care as long as it is installed correctly.
However, in general, you should:
• Avoid applications for which the sensor was not designed, such as extreme temperatures, contact with
incompatible corrosive chemicals and fumes, or other damaging environments.
• Inspect the threads whenever you remove the sensor from duty or change its location.
• Troubleshooting
Should you have problems with your LOE Ultrasonic Sensor, here are some troubleshooting steps.
• Check the received signal strength (See Figure 4.9). If the signal strength is low, alternately increase
Pulses and Sensitivity (See Figure 4.4) until the signal strength improves.
• Ensure Temperature Compensation (See Figure 4.4) is On (set to 1).
• Set the Gain Control to AutoSense (See Figure 4.4).
• Ensure that Blanking (See Figure 4.4) is accurately set to account for any unwanted targets between the
sensor and the closest acceptable target (See Figures 4.5 - 4.7).
Should you have problems with your LOE Modbus Network Controller, here are some troubleshooting
steps.
• Check the Modbus Network connections at the LOE and at each of the attached sensors.
• Ensure that each attached sensor has been assigned a unique Sensor Number (Figure 4.23; Assigning
Modbus Sensor Numbers, page 12).
• Check the Holding Register Settings for each attahed sensor (Figures 4.17 and 4.18).
This procedure uses targets at known distances to calibrate the LOE sensor’s accuracy. A wall or other large,
at object is recommended for the long range target.
• Point the sensor at a target at a known distance near the maximum range of the sensor (See Figure
5.1).
• Adjust the Multiplier value until the distance reading on the sensor matches the actual measured distance to the target (See Figure 4.4).
• Point the sensor at a target near the minimum measurement range, 1’ plus any Blanking distance (See
Figure 5.2).
• Adjust the Oset value until the distance reading on the sensor matches the actual measured distance
to the target (See Figure 4.4).
• Repeat previous two steps until no further adjustment is required.
measure
measure
Figure 5.1Figure 5.2
• Repair and Returns
Should your LOE require service, please contact the factory via phone, email, or online chat. We will issue
you a Return Material Authorization (RMA) number with instructions.
• Phone: 888-525-7300
• Email: sales@apgsensors.com
• Online chat at www.apgsensors.com
Please have your LOE’s part number and serial number available. See Warranty and Warranty Restrictions
for more information.