APG LPU-2127 User manual

APG
R
Doc #9002657
Rev B, 01/15
LPU-2127
User Manual

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Table of Contents
Introduction ................................................................................................................ iii
Warranty and Warranty Restrictions.................................................................... iv
Chapter 1: Specications and Options..................................................................... 1
Dimensions ........................................................................................................................................1
Specications ................................................................................................................................... 2
Chapter 2: Installation and Removal Procedures and Notes..............................3
Tools Needed..................................................................................................................................... 3
Installation Notes ............................................................................................................................ 3
Mounting Instructions ................................................................................................................... 4
Electrical Installation ..................................................................................................................... 4
Removal Instructions ..................................................................................................................... 4
Chapter 3: Set Up and Operation ..............................................................................4
User Interface ............................................................................................................................... 4-5
Operation Modes .......................................................................................................................... 6-7
Calibration Modes.........................................................................................................................7-8
Utility Modes ................................................................................................................................ 8-9
Chapter 4: Maintenance .............................................................................................9
General Care...................................................................................................................................... 9
Troubleshooting............................................................................................................................. 10
Calibration ....................................................................................................................................... 10
Repair and Returns.........................................................................................................................11
Chapter 5: Hazardous Location Drawing and Certication .............................. 12
Hazardous Location Drawing ...................................................................................................... 12
CSA Certicate of Compliance...............................................................................................13-16

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Introduction
Thank you for purchasing a LPU-2127 ultrasonic sensor from APG. We appreciate your business! Please take
a few minutes to familiarize yourself with your LPU-2127 and this manual.
The LPU-2127 loop-powered ultrasonic sensor provides a low-power, non-contact level measurement
solution rated for hazardous locations and suitable for harsh chemical environments. It oers a built-in
keypad and four digit LCD display for easy setup, and a NEMA 4X cover for outdoor applications.
Reading your label
Every APG instrument comes with a label that includes the instrument’s model number, part number, serial
number, and a wiring pinout table. Please ensure that the part number and pinout table on your label
match your order. The following electrical ratings and approvals are also listed on the label. Please refer to
the Certicate of Compliance at the back of this manual for further details.
Electrical ratings
Input: 12 to 28 Volts DC; Output: 4-20mA
Class I Division 2; Groups C, D T6
Class I, Zone 2, Group IIB
AEx nA IIB T6: Ta: -40°C to 60°C; IP65
Ex nA IIB T6: Ta: -40°C to 60°C; IP65
IMPORTANT: The LPU-2127 must be installed as shown on drawing 9002745 to meet
listed approvals. Faulty installation will invalidate all safety approvals and ratings.

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Warranty and Warranty Restrictions
APG warrants its products to be free from defects of material and workmanship and will, without charge,
replace or repair any equipment found defective upon inspection at its factory, provided the equipment has
been returned, transportation prepaid, within 24 months from date of shipment from factory.
THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES NOT EXPRESSLY SET
FORTH HEREIN, 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 specically 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
and APG’s liability hereunder, in any case, is expressly limited to the repair or replacement (at APG’s option)
of goods.
Warranty is specically at the factory. Any on site service will be provided at the sole expense of the
Purchaser at standard eld 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 becomes 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 the nal review by APG. Returns are subject to restocking charges as
determined by APG’s “Credit Return Policy”.

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Chapter 1: Specications and Options
• Dimensions
4.00"
101.6 mm
5.50"
139.7 mm
6.05"
153.7 mm
2.00"
50.80 mm
2.40"
60.96 mm
2.30"
58.42 mm
2" NPT

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Performance
Operating Range 1 - 25 ft. (0.3 - 7.6 m) on liquids and hard, at surfaces
1 - 10 ft. (0.3 - 3 m) on bulk solids
Analog Output 4-20 mA
Beam Pattern 9° o axis
Frequency 69 kHz
Response Time 0.6 - 3 seconds (dependent on output range)
Sample Rate 3 seconds @ 4 mA
0.6 seconds @ 20 mA
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
NEMA rating 4X
Electrical
Supply Voltage (at sensor) 12-28 VDC
Current Draw 22 mA max
Output Signal 3-30 mA max
Load Resistence 150Ω max @ 12 VDC
600Ω max @ 24 VDC
Cable Connection 2-terminal connector
Masterials of Construction
Transducer Housing PVDF (Kynar®)
Upper Housing PET
• Specications

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Chapter 2: Installation and Removal Procedures and Notes
Tools are not necessary for installing the LPU itself. If you are using a stand pipe to mount your LPU, you will
probably need tools to install the stand pipe, but not for the LPU.
• Tools Needed
• Installation Notes
• Mount your LPU sensor so that it has a clear, perpendicular sound path to the surface being moni-
tored. 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
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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• Mounting Instructions
• With the lid of your LPU closed, remove the cable knock out.
• Clear the ashing.
• Open the lid of your LPU and intall cable gland or conduit connection.
• Connect 12-28 VDC supply wire to (+) Terminal
• Connect 4-20 mA output wire to (-) Terminal.
• Electrical Installation
• Remove the sensor and store it in a dry place, at a temperature between -40° F and 180° F.
• Removal Instructions
Mounting your LPU 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.
The LPU display and programming buttons can be accessed by loosening the screw that secures and seals
the sensor’s lid. The LCD display shows the distance measurement. The display is also used to view the
individual modes and their values when programming.
The LPU controls operate similar to a digital wrist watch. The LPU has four buttons, MODE UP, MODE
DOWN, VALUE UP, and VALUE DOWN (See Figure 3.1). The MODE UP/DN buttons allow the user to select the
desired mode while VALUE UP/DN buttons allow the user to view and alter the settings.
To select a mode, press the MODE UP or MODE DOWN button until the desired mode is displayed. Press the
VALUE UP or VALUE DOWN button once to view the current setting of that mode.
To change the selected mode setting, press the VALUE UP or VALUE DOWN button until the desired value is
displayed.
Chapter 3: Set Up and Operation
• User Interface

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Figure 3.1
Along with the buttons and the display, the LPU-2127 includes a detected signal strength indicator. On the
leftside of the display are bars to indicate the strength of the signal returning to the sensor (See Figure 3.2).
Three bars indicates excellent signal strength; two bars indicates good signal strength; one bar indicates fair
signal strength; no bars indicates loss of echo (no signal).
Figure 3.2
To STORE or SAVE the changed mode value, press the MODE UP or MODE DOWN button once. At this point,
the display will show the distance measurement. The values are stored in a nonvolatile memory, and will not
be lost when power is turned o.

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• Operation Modes
MODE DESCRIPTION PARAMETERS
1 Units Range = 0-2
Default = 0
0 = feet
1 = inches
2 = mm
Mode 1 is used to select the units of measurement that will be used throughout the setup process and also
for display. The units will also determine the resolution of the display and the outputs. The resolution is: feet
0.01, inches 0.1, and millimeters 1.
NOTE: All modes must be set using the units selected in Mode 1.
MODE DESCRIPTION PARAMETERS
2 4 mA distance Units = Mode 1
Range = 0-9999
Default = 1.00 ft.
Mode 2 sets the 4 mA distance, measured from the Zero Point (See mode 10).
MODE DESCRIPTION PARAMETERS
3 20 mA distance Units = Mode 1
Range = 0-9999
Default = 25.00 ft.
Mode 3 sets the 20 mA distance, measured from the Zero Point (See mode 10).
For Distance conguration (i.e., greater mA output for target surface further from sensor), set the mode 2
distance to be less than the mode 3 distance (See Figure 3.3).
For Fill conguration (i.e., greater mA output for target surface closer to sensor), set the mode 2 distance to
be greater than the mode 3 distance (See Figure 3.4).
Zero Point Max. Distance Zero Point Max. Distance
mode 2 mode 3 mode 3 mode 2
20 ma
4 ma
20 ma
4 ma
Figure 3.3 Figure 3.4