The document describes the SL-7516 Series Indicator, a digital weight indicator manufactured by Selleton Scales. This manual covers two models: SL-7516-E (LED display) and SL-7516-C (LCD display).
Function Description
The SL-7516 Series Indicator is designed for various weighing applications, providing accurate and reliable weight measurements. It serves as the central display and control unit for a weighing scale system, connecting to load cells to process and display weight data. The indicator supports multiple weighing units and offers various hold functions, making it versatile for different operational needs, including general weighing, animal weighing, and material testing. It also includes features for overload/underload indication, printing, low battery reminders, and automatic power-off for energy saving.
Important Technical Specifications
The SL-7516 indicator boasts robust technical parameters:
- Accuracy Class: 3000e, indicating a high level of precision.
- Stimulating Voltage: +3.3 VDC.
- A/D Converting Speed: 10 SPS (Samples Per Second).
- Load Signal Range: 0~12.8mV.
- Load Capacity: Capable of connecting up to 4 pieces of 350Ω load cells.
- Interval (Graduation): Selectable options of 1, 2, 5, 10, 20, or 50.
- Display:
- SL-7516-E: 6 digits LED display with a word height of 20.3mm.
- SL-7516-C: 6 digits LCD display with a word height of 20.3mm.
- Interface: RS232C, allowing for communication with external devices.
- Baud Rate: Configurable to 1200, 2400, 4800, or 9600.
- Battery: 4V/4Ah rechargeable battery, providing approximately 45 hours of operation on a full charge.
- AC Power: AC 100-250V, requiring a 9V adapter (supplied).
- Operation Temperature: -10 °C to +40 °C.
- Operation Humidity: ≤90%RH.
- Storage Temperature: -40 °C to +70 °C (32-104°F).
- Dimensions: Approximately 8.7 inches wide, 6 inches high (front view), and 3.2 inches deep (side view).
Usage Features
The SL-7516 indicator offers a comprehensive set of features for user interaction and measurement:
- Power On/Off: Press and hold the ON/OFF button for 2 seconds to power on or off. The scale performs an auto-check and countdown upon startup.
- Weighing Units: Supports multiple units including kilograms (kg) and pounds (lb). The SL-7516-C model also supports ounces (oz) and pieces (pcs).
- Zeroing: The ZERO key resets the scale to zero when empty, compensating for minor material build-up. The manual zero range can be configured in the parameter settings.
- Tare Function: The TARE key allows users to subtract the weight of a container, displaying only the net weight of the item. Pressing TARE again exits tare mode.
- Hold Functions: Five distinct hold options are available:
- Peak Hold: Captures and displays the highest weight recorded (useful for tension/pulling force tests).
- Manual Hold: Freezes the current weight on the display until the HOLD key is pressed again.
- Auto Hold: Automatically holds a stable weight (above 20d) for 3 seconds before returning to general weighing.
- Average Hold: Calculates and displays the average weight over a 3 or 5-second sampling period (ideal for animal weighing). The display shows "LOC" during sampling.
- Auto Average Hold: Automatically initiates average hold for animal weighing when a stable weight is detected, without requiring a key press.
- Printing: When connected to a printer and configured in print mode (C18=2), pressing and holding the SET key will print the current weight data, including Net Weight (N.W.), Tare Weight (T.W.), Gross Weight (G.W.), and a print number (NO.).
- Display Indicators:
- SL-7516-E (LED): Includes indicators for Gross, Net, Tared, Hold, lb, kg, and Battery status (flashing red for low, solid red for charging, green for fully charged). Also features OVER, ACCEPT, and UNDER lights for alarm parameters.
- SL-7516-C (LCD): Displays icons for Net, Gross, Tare, Total, Peak, Hold, and Lobat (low battery). Also includes OYER (Over), H (High), ACCEPT, UNDER, and Lo (Low) indicators for alarm parameters.
- Key Descriptions:
- ON/OFF: Powers the indicator (hold for 2 seconds).
- HOLD: Activates hold functions.
- UNITS: Shifts between weighing units (kg/lb/oz).
- TARE: Zeros the scale for containers or clears tare.
- ZERO: Zeros the scale.
- SET: Enters/exits calibration and works with ON/OFF for setup menu.
- Arrow Keys (▲▼◄►): Used for navigation and value adjustment in settings.
- Enter/Return (↵): Confirms selections.
- Parameter Settings: Extensive calibration and parameter settings (C01 to C45) allow for customization of weighing units, decimal places, graduation, maximum capacity, zero calibration, hold functions, alarm limits, communication mode, baud rate, zero ranges, filters, print time/date, and gravity settings. Access to certain settings (C01-C06) requires the seal switch (located on the PCB) to be OFF.
- Communication Mode: Supports continuous sending mode for PC via RS232, transmitting weight status, mode, sign, value, and unit.
Maintenance Features
The manual outlines several aspects related to the maintenance and care of the SL-7516 indicator:
- Safety Precautions: Emphasizes the importance of professional staff for calibration/maintenance, stable surface placement, power disconnection during electrical connections, avoiding internal component contact, not exceeding load limits, and proper handling to prevent damage.
- Battery Management:
- Initial charge of 10-12 hours is recommended to prevent low voltage.
- Battery life is approximately 45 hours on a full charge.
- Monthly full discharge and recharge are recommended to maintain battery health.
- Remove the battery if the indicator will not be used for a long period to prevent leakage.
- Battery indicator lights (red for low/charging, green for full) on SL-7516-E, and a battery symbol on SL-7516-C, provide status.
- Anti-Static Measures: Advises discharging accumulated static charge from the operator's body before opening the protective container with ESDS devices, either by touching a grounded surface or wearing an anti-static wrist strap and mat.
- Calibration Procedure: A detailed step-by-step guide is provided for calibrating the scale, including setting weighing units, decimal places, graduation, maximum capacity, zero calibration, and span calibration with a known weight. This procedure ensures accuracy and requires careful attention to detail.
- Troubleshooting: A table of error codes (e.g., "UUUUUU" for overload, "Err 1" for incorrect calibration weight) and their corresponding reasons and solutions is provided to assist users in diagnosing and resolving common issues. Solutions include reducing weight, checking load cell connections, ensuring the scale is level, recalibrating, and in some cases, PCB replacement.
- Load Cell Connection: Instructions for connecting load cells to the indicator are provided, noting compatibility with 4-wire or 6-wire 350Ω load cells.
- Power Supply: Recommends using only the supplied 9V AC adapter and plugging it into a wall outlet to avoid interference.
The SL-7516 Series Indicator is a comprehensive and user-friendly device designed for a wide range of industrial and commercial weighing applications, offering precision, versatility, and ease of maintenance.
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