The LP-7515 Indicator is a versatile weighing indicator designed for industrial and commercial use, offering a range of features for accurate and efficient weighing operations.
Function Description
The primary function of the LP-7515 is to provide precise weight measurements and display them clearly. It supports multiple weighing units (lb/oz/kg) and includes functions for gross, tare, and zero weighing. The device also features various hold functions, including peak hold, manual hold, auto hold, average hold, and auto average hold, making it suitable for different applications such as materials testing and animal weighing. It has an RS232 output for connecting to a computer or printer, enabling data logging and ticket printing.
Important Technical Specifications
- Accuracy Class: OIML III, n=3000e
- Tare Range: 2%~100% max. capacity
- Initial Zero Range: ±10% max. capacity
- Manual Zero Range: ±2% max. capacity
- Display Resolution: Up to 1/15,000
- Operation Temperature: -10 °C ~ +40 °C
- Operation Humidity: ≤90%RH
- Storage Temperature: -40 °C ~ +70 °C (32-104°F)
- Display: 6 digits, 0.7″ tall LCD with backlight
- Power Supply: 3 AAA batteries (approx. 30 hours with backlight, up to 100 hours without) or included DC power supply.
- Load Cell Connectivity: Can connect with up to 4 load cells of 350Ω at most.
- Serial Interface: RS232 output with selectable baud rates (9600, 4800, 2400, 1200, 600 bit/s).
- Dimensions: Approximately 8" (width) x 4.5" (height) x 2.5" (depth, including bracket).
Usage Features
The LP-7515 offers a user-friendly interface with a splash-proof keyboard and display.
- Power On/Off: Pressing the ON/OFF key for 1 second powers the unit on or off. The device performs a self-inspection and counts from 1-9 before displaying 0 in weighing mode.
- Zero/Tare Function: The zero function is used when the scale is empty and not at gross zero due to material buildup. If the weight is within 2% of the max capacity and stable, pressing ZERO will zero the scale. The tare function is used to measure the net weight of an item by subtracting the weight of a container; if the scale is out of the zero range and stable, pressing ZERO will tare the scale and switch to Net weighing mode.
- Print Function: To print, press and hold the UNITS key when the weight is stable. The communication setting must be set to #2 for print mode.
- Hold Functions:
- Peak Hold: Captures and displays the highest weight recorded, useful for materials testing. Press HOLD, add weight, and the indicator will show the highest recorded weight.
- Manual Hold: Grabs and holds the current stable weight on the screen.
- Auto Hold: Automatically holds a stable weight (above 20d) for 3 seconds, then returns to general weighing. No key press is needed.
- Average Hold: Used for animal weighing. Press HOLD after adding an animal, and the indicator will display the average weight sampled over a set time (1-9 seconds, configured in HAt parameter).
- Auto Average Hold: Similar to average hold but without pressing the HOLD key. It automatically samples and displays the average weight after a set loading time (HAdt parameter) and sampling time (HAt parameter).
- Unit Conversion: The UNITS key allows switching between weighing units (kg/lb).
- Parameter Settings: Accessing parameter settings by pressing HOLD and UNIT together allows customization of various functions, including automatic power-off time (10, 20, 60, 90 minutes or off), backlight behavior (always off, on with weight change/key press, or constant), unit switch function, hold function type, hold time, average hold sample time, loading time for auto average hold, zero range, negative range, communication setting (off, continuous, print, command request), and baud rate.
- Low Battery Warning: A low battery icon will display when the battery is low, and the indicator will automatically power off if not replaced in time.
- Wall Mount Bracket: Includes a stainless steel wall mount bracket for flexible installation.
Maintenance Features
- Calibration: The device can be calibrated to ensure accuracy. Calibration involves turning the indicator off, then pressing and holding HOLD and UNIT while turning it on. Users can select the unit (kg or lb), set the maximum capacity (FS 0-6), and define decimal places, division, and calibration loading weight. The calibration process includes zero calibration (no load) and loading calibration (with a defined calibration weight).
- Safety Precautions: The manual emphasizes that calibration and maintenance should only be performed by professional staff. Users are advised to ensure the indicator rests on a stable surface, cut off power during electrical connections, avoid touching internal components, not exceed the rated load limit, and take anti-static prevention measures (e.g., wearing an anti-static wrist strap and using a mat) when handling ESDS devices inside. It also warns against leaving the charger plugged in once the battery is fully charged to prevent damage.
- Troubleshooting: The manual provides a troubleshooting guide for common error codes such as "UUUUUU" (overload, wrong connection, load cell quality), "nnnnnn" (wrong connection, load cell quality), "ERR1" (over capacity), "ERR2" (below minimum required weight), "ERR3" (input signal negative), "ERR4" (unstable signal), and "ERR5" (EEPROM error), along with suggested solutions.
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