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.
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 and APG’s liability hereunder, in any case, is expressly limited to the repair or replacement (at APG’s option)
• Specifications Performance Operating Range 1 - 25 ft. (0.3 - 7.6 m) on liquids and hard, flat surfaces 1 - 10 ft. (0.3 - 3 m) on bulk solids Analog Output 4-20 mA Beam Pattern 9° off axis Frequency 69 kHz Response Time 0.6 - 3 seconds (dependent on output range)
Chapter 2: Installation and Removal Procedures and Notes • Tools Needed 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. •...
• Mounting 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.
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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).
• Operation Modes MODE DESCRIPTION PARAMETERS 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.
MODE DESCRIPTION PARAMETERS Response Time Range = 1-3 Default = 1 1 = 3.3 ft/min (1m/min) 2 = 15ft/min (4.5m/min) 3 = >15 ft/min (4.5/min) Mode 4 is used to select the desired response time of the sensor. The response time represents the maximum rate of change in target level that the sensor will accurately display.
0 = Manual (user controls Sensitivity and Pulses) 1 = AutoSense (sensor controls Sensitivity and Pulses) Mode 12 activates or deactivates AutoSense. When operating with this mode active, the LPU-2127 will automatically change the sensitivity and pulses to match the application. Modes 13 and 15 limit the maximum level that sensitivity and pulses can be manipulated when operating in AutoSense.
Chapter 4: Maintenance • General Care Your LPU-2127 ultrasonic sensor is very low maintenance and will need little care as long as it was 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, or other damaging environments.
• Trouble Shooting Should you have problems with your LPU-2127, here are some troubleshooting steps. • Check the received signal strength (See Figure 3.2 on page 5). If the signal strength is low, alternately increase Pulses (mode 15) and Sensitivity (mode 13) until the signal strength improves.
• Repair and Returns Should your LPU-2127 ultrasonic sensor 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 LPU-2127’s part number and serial number available.
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