APG LOE Operating Manual

APG

LOE Ultrasonic Level Sensors

User Manual

Web Enabled Controller, Series B

R

Doc #9004258

Rev C, 04/16

Table of Contents

Introduction ................................................................................................................ iii

Warranty and Warranty Restrictions .................................................................... iv

Chapter 1: Specications and Options.....................................................................1

Dimensions ........................................................................................................................................1

Specications ............................................................................................................................... 2-3

Model Number Congurator .......................................................................................................... 3

System Wiring Diagrams ........................................................................................................... 4-6

Chapter 2: Installation and Removal Procedures and Notes ..............................7

Tools Needed .....................................................................................................................................7

Connection Notes ............................................................................................................................. 7

Electrical Installation .....................................................................................................................7

Installation Notes ............................................................................................................................8

Mounting Instructions ................................................................................................................... 8

Software Setup ............................................................................................................................9-13

Removal Instructions ................................................................................................................... 13

Chapter 3: Programming with Modbus TCP/IP ................................................... 14

Modbus Polling via Ethernet with Modbus TCP/IP ...........................................................14-15

LOE Generic Modbus Register List .............................................................................................15

Modbus Programming of Individual Sensors .......................................................................... 16

Chapter 4: LOE Embedded Web Server ..................................................................16

Accessing the LOE Embedded Web Server ............................................................................. 16

Navigating the LOE Embedded Web Server ........................................................................16-17

LOE Sensor Input Conguration Submenus .......................................................................18-32

Modbus Sensor Conguration Registers ............................................................................ 33-35

LOE Utility Menus ................................................................................................................... 36-39

Chapter 5: Maintenance .......................................................................................... 40

General Care ....................................................................................................................................40

Troubleshooting ............................................................................................................................. 40

Calibration ....................................................................................................................................... 41

Repair and Returns ........................................................................................................................ 41

ii

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Introduction

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 oers 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.

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iii

Warranty and Warranty Restrictions

This product is covered by APG’s waranty to be free from defects in material and workmanship under

normal use and service of the product for 24 months. For a full explanation of our Warranty, please visit

https://www.apgsensors.com/about-us/terms-conditions. Contact Technical Support to recieve a Return

Material Authorization before shipping your product back.

Scan the QR code below to read the full explanation of our Warranty on your tablet or smartphone.

iv

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Chapter 1: Specications and Options

• Dimensions

LOE-2126, LOE-6126

2.40”

61.0mm

2.30”

58.4mm

4.00”

101.6mm

2.00”

50.8mm

4.00”

101.6mm

6.05”

153.7mm

2” NPT

5.50”

139.7mm

LOE-3136

6.05”

153.7mm

2.40”

61.0mm

3.86”

98.0mm

3” NPT

3.00”

76.2mm

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5.50”

139.7mm

1

• Specications

Performance

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

Materials of Construction

Transducer Housing PVDF
Upper Housing PC/PET
Transducer Type Ceramic, PVDF faced

2

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Mounting

LOE-2126 2” Ø NPT
LOE-3136 3” Ø NPT
LOE-6126 2” Ø NPT

Compatible APG Modbus Senors

Ultrasonic MNU
Magnetostrictive MPX-E1, MPX-R1
Pressure PT-400-L5, PT-400-L31, PT-500-L5, PT-500-L31
Controllers DCR-1006A, MND

• Model Number Congurator

Model Number: LOE - _____ - _____

A B

A. Model

□ 2126 1 - 25 ft. (305mm - 7620mm); 69 kHz; 2” NPT threads
□ 3136 1.5 - 40 ft. (458mm - 12192mm); 43 kHz; 3” NPT threads
□ 6126 0.6 - 15 ft. (178mm - 4572mm); 69 kHz; 2” NPT threads

B. Relay Conguration

□ 0000 2 relay outputs
□ 0010 1 relay output, 1 switch input
□ 0110 2 switch inputs

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3

• System Wiring Diagrams

External 12-28 VDC Source Wiring

To 12-28 VDC Power Supply

+

-

ETHERNET
PORT

COM
OK

SEND/
RESET

TR1 TR1 TR2 TR2

24V B A GND

RS-485

POE (Power over Ethernet) Wiring

To

Network

Connection

24V B A GND

RS-485

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 B A GND

RS-485

Terminal inside housing
supplies 24 Vdc to power
attached Modbus devices

To AC
power

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when powering the LOE
from a POE source.

Modbus Sensor Daisy-chain Wiring

270 Ω terminating

resistor NOT internal

to LOE

RS-485

24VBAGND

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

necessitate a different size resistor.

Trunk Line

Sensor Line Drops

B

A

Sensor 1

GND

V+

B

Sensor 2

270 Ω

terminating

resistor at

last sensor

B

A

V+

GND

A

Sensor 3

GND

V+

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5

System Overview - LOE with Modbus network, SSR’s and Internet Connection

MNU Ultrasonic Sensors MP Magnetostrictive Float Level Sensors

Server Hosting

Website and

Logged Data

Network / Internet Connection

Computer

on

Internet

Computer

on

Local

Network

Connection to
Internet

Modbus
Input

Solid State Relays

6

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Chapter 2: Installation and Removal Procedures and Notes

• Tools Needed

• Flat head screwdriver to remove knockouts for cables.

• If you are using a stand pipe to mount your LOE, you will probably need tools to install the stand pipe.

• For any attached Modbus sensors, please consult each sensor’s user manual for installation notes and

instructions.

 NOTE: For any APG sensor user manual, please visit http://apgsensors.com/support.

• Connection Notes

• Up to 10 Modbus sensors can be connected to the LOE in any combination.

• Output SSR’s are rated for 120V, 120mA max.

 IMPORTANT: Each Modbus sensor must be connected to the network individually and

assigned a unique Sensor Number before the next sensor can be added.

• Electrical Installation

• Use at head screwdriver to remove knockouts on either side of LOE housing.

• Insert included cable ttings in knockout holes.

• Connect any relays rst.

• Connect LOE to Ethernet/network.

• Connect independent 12-28 VDC supply if not using POE.

• Connect and set up one Modbus sensor at a time.

 IMPORTANT: Multiple Modbus sensors added to the network simultaneously are all

assigned the same Modbus address/sensor number: 1. Sensors MUST be added to the
network individually.

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7

• Installation Notes

• 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:

http://www.apgsensors.com/about-us/blog/how-to-install-a-stand-pipe.

Figure 2.1

• Mounting Instructions

Mounting your LOE is easy if you follow a few simple steps:

• Never over-tighten the sensor.

• Always screw in your sensor by hand to avoid cross-threading. Thread failure can be a problem if you

damage threads by over-tightening them or by crossing threads.

 IMPORTANT: Do not over tighten! The sensor should be threaded in only hand tight.

 NOTE: Do not mount the sensor where the beam will intersect objects such as ll

streams, pipes, ladder rungs, wall seams, or corrugated tank walls.

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• Software Setup

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.levelandow.com.

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9

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)

Figure 2.4

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Figure 2.5

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On the Sensor Information screen you will see

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 congured 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.

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11

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 2.9 Figure 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).

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Figure 2.11

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Change Numb of Sensors On Line to reect 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 congured.

• 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.

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13

Chapter 3: Programming with Modbus TCP/IP

• Modbus Polling via Ethernet with Modbus TCP/IP

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 Identier
00 00 : Protocol Identier
00 06 : Message Length (6 bytes to follow)
0B : The Reporting Unit Identier [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.levelandow.com).

• Data Address of registers, decimal to “hex minus 1” conversion:

Decimal Address Hex minus 1 Decimal Address Hex minus 1

299 12A 306 131
300 12B 307 132
301 12C 308 133
302 12D 309 134
303 12E 310 135
304 12F 311 136
305 130 312 137

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• Total number of registers requested, up to 14, given in hex:

# of Registers Hex equivalent # of Registers Hex equivalent

01 01 08 08
02 02 09 09
03 03 10 0A
04 04 11 0B
05 05 12 0C
06 06 13 0D
07 07 14 0E

• LOE Generic Modbus Register List

Input Registers (0x04)

Register Returned Data

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.

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15

• Modbus Programming of Individual Sensors

The LOE does NOT support full Modbus programming of attached sensors. Full control and conguration of

individual sensors is supported through the LOE’s embedded web server and through your APG-provided

webpage, www.levelandow.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:

• LOE Sensor Input Conguration Submenus

Application Parameters
Basic Parameters

• Modbus Sensor Conguration Registers

RS-485 Modbus Input Reg
RS-485 Modbus Holding 1
RS-485 Modbus Holding 2

• LOE Utility Menus

Network

Security
Label

RS-485 Network Settings

The Menu Page also has a link back to the Main Display Page.

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Figure 4.1

Figure 4.2

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17

• LOE Sensor Conguration Submenus

LOE Application Parameters

Figure 4.3

The Application Parameters menu congures the application-specic parameters applied to the calculated

reading from the LOE sensor.

PARAMETER RANGE

Units 1 - feet

2 - inches
3 - meters

Units is used to select the units of measurement for distance or level applications. The units will also

determine the resolution of Basic and Application Parameters. The resolution is: feet 0.01, inches 0.1, and

meters 0.001.

PARAMETER RANGE

Decimal Place 0 - 3

Decimal Place determines the number of decimal places shown on the output reading (see Figure 4.1). As the

output reading is used for setting/evaluating Trip Distance and Window, the Decimal Place setting applies to
those parameters as well.

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PARAMETER RANGE

Full Distance 0 - Sensor Maximum

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 Type 0 = 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 Dened 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 conguration to convert the distance of Distance into the
congured 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 reect the parameters of the chosen application.

See Tank Parameters for an explaination of each Application Type and its associated parameters.

PARAMETER RANGE

Volume Units 1 = Feet3
2 = Million Feet3
3 = Gallons
4 = Meters3
5 = Liters
6 = Inches

3

7 = Barrels

Volume Units selects the units of measure for the congured reading on the Main Display Page (See Figure

4.1) when a volumetric application is selected. The settings is not used when the Application Type is set to 0,
1, 7, or 8.

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19

Tank Parameters

Radius

Distance

Application Type Tank Parameter Function

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

Empty

Distance

or

Diameter

Full

Distance

Bottom

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Application Type Tank Parameter Function

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

End
Radius

or

Diameter

Length

Chute
Length

Chute X

Chute Y

Full
Distance

Empty
Distance

Tank Y

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21

Full

Application Type Tank Parameter Function

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 Denition (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 congured 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 Dened Units Parameter 1 Not Used
Parameter 2 Not Used
Parameter 3 Not Used
Parameter 4 Not Used
Parameter 5 Not Used

User Dened 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

Distance

Empty

Width

Depth

Length

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Application Type Tank Parameter Function

Full

10 - Horizontal Oval Parameter 1 Tank Length
Tank Parameter 2 Tank Depth
Parameter 3 Tank Width
Parameter 4 Not Used
Parameter 5 Not Used

Application Type Tank Parameter Function

11 - Polynomial Parameter 1 X^3 Coecient
(Strapping Chart) Parameter 2 X^2 Coecient
Parameter 3 X^1 Coecient
Parameter 4 X^0 Coecient
Parameter 5 Not Used

Distance

Empty

Distance

Depth

Length

Width

Basic Parameters

Figure 4.4

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23

PARAMETER RANGE

Sensitivity 0 - 100%

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 amplication 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 reections 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-

ures 4.5 - 4.7.

24

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Effective

Measurement Zone

Effective

Measurement Zone

Effective

Measurement Zone

Zero
Point

Offset = 0

Blanking

Sensor

Max.

Distance

Offset

Zero

Point

Offset > 0

Blanking

Sensor

Max.

Distance

Offset

Zero
Point

Offset < 0

Blanking

Sensor

Max. minus

Offset

Sensor
Max.
Distance

Figure 4.5 Figure 4.6 Figure 4.7

PARAMETER RANGE

Pulses 0-20

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

Pulses to reduce multiple echoes.

PARAMETER RANGE

Gain Control 0 = Manual

1 = AutoSense
2 = Hard-Target
3 = Soft-Target
4 = Auto-Soft Target
5 = Auto-Hard Target

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 qualied samples to average for the displayed reading. Qualied samples are

placed in a rst-in, rst-out buer, the contents of which are averaged for Distance. The larger the number of
qualied samples being averaged, the smoother the Distance reading will be, and the slower the reading will
be to react to quick changes.

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25

PARAMETER RANGE

Window 0 - Sensor Maximum

Window determines the corresponding physical range for qualied 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 buer. (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. Reading Max. 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 aect
distance measurements. These eects can be minimized by activating temperature compensation.

26

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PARAMETER RANGE

Oset -10 ft - + 10ft

Oset 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 Oset 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 Oset 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 Oset, and the eective measurement zone of the sensor
begins at the forward end of Blanking. If Oset is more negative than Blanking is positive, the net dierence
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 congured output of the sensor. This is also shown on the Main Display.
Calc. Dist,Level,Volume is used for Trip measurements.

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27

Reading Type Range

Signal Strength 0 - 100

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 congured to turn on or o based on the Calc.
Dist,Level,Volume reading of the sensor.

Trip Type Outputs are congured 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.

levelandow.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.

28

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Alarm Type

1_ - Active Alarm

TRIP

DISTANCE

TRIP

WINDOW

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.

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29

INTERVAL TIME

Trip Condition

5 - Hysteresis Far

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.

Trip Condition

6 - Disable Trip Relay
16 - Turn on Trip Relay
26 - N/A

Disable de-activates the Trip or SS Relay output.

Trip Condition

7 - Loss of Echo

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-

dened maximum rate of level change (change in distance
or level divided by elapsed time) is exceeded. Trip Distance
denes the distance and Trip Window denes the time.

OFF

Figure 4.12

(in minutes)

Figure 4.13

OFF

ON

ON

Relay “OFF”(open)

30

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LOE Trip Outputs and Settings

Figure 4.14

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 congurations 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.

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31

External Website Communication Status

Figure 4.15

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.levelandow.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

in the transmission.

32

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• Modbus Sensor Conguration Registers

RS-485 Modbus Input Registers

Figure 4.16

This display-only menu shows the contents of the Input Registers for the selected Modbus sensor (See Figure

2.8). Registers used vary by sensor type. Please see the user manual for each sensor for a full list of registers.

• Detected Sensor Type Number and Sensor Model Number List:

Sensor Type Model Number Sensor Type Model Number

0 LOE-2126 9 PT-400/PT-500-L31 (Level)
1 LOE-6126 10 PT-400/PT-500-L5 (Pressure)
2 LOE-3136 11 DCR-1006A
3 LOE-7126 12 LPD
4 RST-5001 13 MND
5 MPX-E1/R1 (2 oats) 14 RST-5003/4
6 MPX-E1/R1 (1 oat) 15 AUS-7123

7 PG-7 16 MTM-1000

8 PG-10

Note: This list represents sensors that interface with various APG Modbus software packages. Not all interface

with the LOE.

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33

RS-485 Modbus Holding 1

Figure 4.17

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 congured 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.

34

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RS-485 Modbus Holding 2

Figure 4.18

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 congured 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.

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35

• LOE Utilty Menus

Network Settings

Figure 4.19

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.levelandow.com) and congure its own Network Settings when plugged into a

port providing direct internet access.

36

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Security Settings

Figure 4.20

The Security Settings allow users to set their own user name and password for logging into the embedded
webpage.

Labels

Figure 4.21

The Labels menu allow users to create custom labels for the Main Menu, the LOE, and the sensors attached

to the LOE.

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37

Figure 4.22

When labels are created in the Labels menu, they will be reected on the Main Menu page (See Figure 4.22).

RS-485 Network Settings

38

Figure 4.23

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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.

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39

Chapter 5: Maintenance

• General Care

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).

40

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• Calibration

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 Oset 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 5.1 Figure 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: [phone]

• Email: [e-mail]

• 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.

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41

APG

R

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Automation Products Group, Inc.