LPU-2127 Loop Powered Ultrasonic Sensor

Thank you for purchasing an LPU-2127 loop powered ultrasonic level sensor from APG. We appreciate your business and trust. Please take a moment to familiarize yourself with the product and this manual before installation. If you have any questions, you can call us at 888-525-7300. You can also find a full list of our product manuals at: www.apgsensors.com/resources/product-resources/user-manuals.

APG Automation Products Group, Inc.
1025 W 1700 N Logan, UT 84321
www.apgsensors.com | phone: 888-525-7300 | email: sales@apgsensors.com

Document Part #: 122950-0008 Rev B

1. Description

The LPU-2127 loop powered ultrasonic level sensor provides continuous level/distance measurement. It features a built-in keypad for easy programming and is certified by CSA for installation in hazardous areas in the US and Canada for Class I, Division 2, Groups C & D and Class I, Zones 2 environments.

2. How To Read Your Label

Each sensor label includes a full model number, a part number, and a serial number. The model number for the LPU-2127 will follow a specific format, for example: SAMPLE: LPU-2127. The model number indicates the exact configuration of your sensor. You can also contact APG with the model, part, or serial number for assistance. All hazardous certification information is also found on the label.

3. Warranty

APG warrants its products to be free from defects in material and workmanship. APG will, without charge, replace or repair any equipment found defective upon inspection at its factory, provided the equipment is returned, transportation prepaid, within 24 months from the date of shipment from the factory.

This warranty is expressly in lieu of and excludes all other warranties, whether expressed or implied by operation of law or otherwise, including but not limited to any implied warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

No representation or warranty, express or implied, made by any sales representative, distributor, or other agent or representative of APG which is not specifically set forth herein shall be binding upon APG. APG shall not be liable for any incidental or consequential damages, losses, or expenses directly or indirectly arising from the sale, handling, improper application, or use of the goods, or from any other cause relating thereto. APG's liability hereunder, in any case, is expressly limited to the repair or replacement (at APG's option) of the goods.

Warranty service is performed at the factory. Any on-site service will be provided at the sole expense of the Purchaser at standard field service rates.

All associated equipment must be protected by properly rated electronic/electrical protection devices. APG shall not be liable for any damage due to improper engineering or installation by the Purchaser or third parties. Proper installation, operation, and maintenance of the product become the responsibility of the user upon receipt of the product.

Returns and allowances must be authorized by APG in advance. APG will assign a Return Material Authorization (RMA) number, which must appear on all related papers and the outside of the shipping carton. All returns are subject to final review by APG and may be subject to restocking charges as determined by APG's "Credit Return Policy".

4. Dimensions

Diagram showing the physical dimensions of the LPU-2127 sensor. It includes measurements for height (6.05 inches / 153.7 mm), width (5.50 inches / 139.7 mm), and a 2-inch NPT thread connection. It also shows a front view with dimensions of 4.00 inches / 101.6 mm and 2.40 inches / 60.96 mm, and a side view with dimensions of 2.30 inches / 58.42 mm and 2.00 inches / 50.80 mm.

5. Installation Guidelines

The LPU-2127 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° off-axis beam pattern.
• The sensor is tightened by hand to avoid cross-threading.

*Important: For user interface guide and sensor configuration, see the full user manual.

6. Sensor and System Wiring Diagrams

LPU-2127 Wiring Diagram

Diagram illustrating the wiring for the LPU-2127 sensor. It shows a connection for a 4-20mA output and a +24Vdc power supply. A simplified representation includes an ammeter, a power supply terminal (+24Vdc), and a load resistance (or input card) terminal. The diagram indicates that the sensor requires a 12-28 VDC supply connected to the (+) terminal and the 4-20 mA output connected to the (-) terminal. It also notes the maximum load resistance for 12VDC (150 ohms) and 24VDC (600 ohms).

Wiring Instructions:

• With the lid of your LPU closed, use a screwdriver to remove the cable knock out.
• Clear the flashing.
• Open the lid of your LPU and install cable gland or conduit connection.
• Connect 12-28 VDC supply wire to the (+) Terminal.
• Connect 4-20 mA output wire to the (-) Terminal.

*Note: Load resistance @ 12VDC: 150 ohms Max and @ 24VDC: 600 ohms Max.

ℹ️ IMPORTANT: Refer to section 9 for Hazardous Location Wiring.

7. General Care

Your level sensor is very low maintenance and will need little care as long as it was installed correctly. Periodically inspect your LPU-2127 sensor to ensure the sensor face is free of any buildup that might impede its function. If sediment or other foreign matter becomes trapped on the sensor face, detection errors can occur.

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

8. Repair Information

If your LPU-2127 loop powered ultrasonic level sensor needs repair, contact APG via email, phone, or online chat on our website. We will issue you an RMA number with instructions.

• Phone: 888-525-7300
• Email: sales@apgsensors.com
• Online chat at www.apgsensors.com

9. Hazardous Location Wiring

Installation in Class I Division 2 Groups C and D, Class I Zone 2 A EXnA IIB

Diagram showing the installation of LPU-2127/LPU-4127 Ultrasonic Sensor (4-20mA Loop Powered) in hazardous and non-hazardous areas. It depicts a sensor labeled 'B' in the HAZARDOUS AREA, connected via wiring to a point labeled 'A' which is also in the HAZARDOUS AREA. The wiring then extends into the NON-HAZARDOUS AREA. This diagram is for general reference of area classification.

Non-Incendive Wiring for Installation in Class I Division 2 Groups C and D, Max. Temp. 60°C

Diagram illustrating non-incendive wiring for the LPU-2127/LPU-4127 sensor in Class I, Division 2, Groups C and D hazardous locations, with a maximum temperature of 60°C. It shows the sensor in the HAZARDOUS AREA, connected via wiring to associated apparatus in the NON-HAZARDOUS AREA. The diagram specifies parameters for associated apparatus: Vmax ≥ Voc, Ca ≥ Ccable + Ci, La ≥ Lcable + Li. It also lists electrical parameters: Vmax = 28VDC, Imax = 200mA, Ci = 0.1µF, Li = 0. It includes warnings about potential electrostatic charging hazards and not disconnecting the circuit while alive unless the area is known to be non-hazardous, with French translations provided for these warnings.

WARNING: POTENTIAL ELECTROSTATIC CHARGING HAZARD
Clean with only a damp cloth.
(French: AVERTISSEMENT : Risque potentiel de charge électrostatique. Nettoyer uniquement avec un chiffon humide.)

DO NOT DISCONNECT WHILE CIRCUIT IS ALIVE UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
(French: AVERTISSEMENT : Ne pas débrancher tant que le circuit est sous tension, à moins qu'il ne s'agisse d'un emplacement non dangereux.)

• Install in accordance with Section 18 of the CEC or Article 500 of the NEC.
• CSA listed or NRTL/UL listed conduit seal at location A & B as required by Local Authority.
• The cable is terminated in the sensor and runs continuously from the sensor through the Hazardous area and into the Non-Hazardous area.
• Electrical equipment connected to associated apparatus should not generate more than 250 V rms.
• Tampering or replacement with non-factory components may adversely affect the safe use of the system.

Revisions

PROPRIETARY AND CONFIDENTIAL
This drawing is the property of Automation Products Group, Inc., Logan, Utah and may not be used, reproduced, published, or disclosed to others without the written consent of the company. If loaned, it is subject to return upon demand and may not be used in any way directly or indirectly detrimental to the company.

Specifications:
Unless otherwise specified, dimensions are in inches and tolerances are as follows:
Tolerance on Angle: ±1°
2 Places: ±.01"
3 Places: ±.005"
Interpret dimensions and tolerances per ASME Y14.5-2009.

Drawing Details:
Company: APG Automation Products Group, Inc.
Address: 1025 West 1700 North, Logan, Utah USA
Product: Hazardous Installation Drawing For LPU-2127, LPU-4127, LPU-2428 & LPU-4428
Document Number: 9002745
Part Number: 125xxx-xxxx
Revision: D2
Scale: None (Do not scale drawing)
Sheet: 1 of 1