APG LPU-2428 Installation Guide

APG

Thank You

Thanks for purchasing an LPU-2428 loop-powered ultrasonic sensor and RST-4101 programming
module from us! We appreciate your business and your trust. Please take a moment to familiarize
yourself with the products and this manual before installation. If you have any questions, at any
time, don’t hesitate to call us at 888-525-7300.

 NOTE: Scan the QR code to the right to see the full
user manual on your tablet or smartphone. Or visit

https://www.apgsensors.com/support to nd it on our

website.

Table of Contents

LPU-2428 Loop-Powered Ultrasonic Sensor

Installation Guide

For LPU-2428 & RST-4101

1.Description

2. How To Read Your Label

3. Warranty

4. Dimensions

Description

1

The LPU-2428 loop-powered ultrasonic level sensor provides low-power, non-contact measurement

you can count on. The LPU-2428 is certied for installation in hazardous areas in the US and

Canada by CSA for Class I, Division 1, Groups C & D and Class I, Division 2, Group environments.
The default Application setting for the LPU-2428 is Distance, which will work in a wide variety of

settings. Please refer to the full user manual for further conguration settings.

How To Read Your Label

2

Each label comes with a full model number, a part number, and a serial number. The model
number for the LPU-2428 will look something like this:

 SAMPLE: LPU-2428-C6

5. Installation Guidelines

6. Sensor and System Wiring

7. LPU-2428 Default
Application Setting

8. General Care

9. Repair Information

10. Hazardous Location Wiring

R

Automation Products Group, Inc.
1025 W 1700 N Logan, UT 84321
www.apgsensors.com | phone: [phone] | email: [e-mail]

Installation Guidelines

5

The LPU-2428 should be installed in an area--indoors or outdoors--which meets the following
conditions:

• Ambient temperature between -40°C and 60°C (-40°F to +140°F)

• Ample space for maintenance and inspection

Additional care must be taken to ensure:

• The sensor has a clear, perpendicular sound path to the surface being monitored.

• The sensor is mounted away from tank or vessel walls and inlets.

• The sound path is free from obstructions and as open as possible for the 9° o axis beam

pattern.

• The sensor is tightened by hand to avoid cross-threading.

*Important:

For user interface guide and sensor conguration see the full user manual.

Part # 122950-0030

Doc #9004795 Rev A1

The model number tells you exactly what you have. You can also call us with the model, part, or the

serial number and we can help you.

You’ll also nd all hazardous certication information on the label.

Warranty

3

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.

Sensor and System Wiring Diagram

6

LPU-2428 & RST-4101 Wiring

Dimensions

4

NON-METALLIC

STRAIN RELIEF

2" NPT

THREADS

3/4" NPT

THREAD S

ø2.00

[50.80 mm]

[184.15 mm]

5.06

[128.59 mm]

7.25

ø2.79

[70.78mm]

2.65

[67.24mm]

For normal operation, connect the provided cable to your control system:

• Connect the red wire to +24 VDC.

• Connect the black wire to 4-20 mA input. Circuit load resistance + input resistence must be

greater than 150Ω. 249Ω is recommended for optimal signal tranmission.

• Refer to drawing 9002747 (section 10) for Intrinsically Safe installation.

• Refer to drawing 9002745 (section 10) for Hazardous Location installation.

For programming:

• Connect (+) terminal of RST-4101 to +24 VDC supply of sensor (red wire).

• Connect (-) terminal of RST-4101 to 4-20 mA signal from sensor (black wire).

• Ensure that load resistor is between RST-4101 and control network or PLC, rather than

between sensor and RST-4101.

 IMPORTANT: Refer to section 10 for Hazardous Location Wiring.

LPU-2428 Default Application Setting

7

General Care

8

The default Application setting for the LPU-2428 is Distance, which will work in a wide variety of

settings. The LPU-2428 has several additional Application settings that can be congured to meet

your needs.

All of the LPU-2428’s adjustable settings are accessible through the LPU-2428A Software, which is
available at https://www.apgsensors.com/support.

Your level sensor is very low maintenance and will need little care as long as it was installed
correctly. However, in general, you should periodically inspect your LPU-2428 sensor to ensure the
sensor face is free of any buildup that might impede the function of the sensor. If sediment or other
foreign matter becomes trapped on the sensor face, detection errors can occur.

If you need to remove the sensor, be sure to store it in a dry place at a temperature between -40°
and 180° F.

Repair Information

9

If your LPU-2428 ultrasonic sensor or RST-4101 programming module need repair, contact us via
email, phone, or online chat on our website. We will issue you an RMA number with instructions.

• Phone: [phone]

• Email: [e-mail]

• Online chat at www.apgsensors.com

Hazardous Location Wiring

10