Optima Scale OP-900B SERIES

Questions and Answers

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Catherine HarrisonAug 19, 2025
What to do if Optima Scale Accessories shows UUUUUU?
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  Nicole BarrAug 19, 2025
  If the Optima Scale Accessories displays 'UUUUUU', it indicates an overload. Try reducing the weight on the scale. It could also mean there's a wrong connection with the load cell, so you should check the load cell connection. Alternatively, the load cell might have a quality problem; inspect the load cell and check its input/output.
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whitakerdillonAug 21, 2025
What to do if Optima Scale OP-900B Accessories displays ERR3?
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  smithmadisonAug 21, 2025
  If your Optima Scale Accessories shows 'ERR3' during calibration, this indicates a negative input signal. First, check all wire connections. Second, check the load cell. Third, recalibrate the scale. If these steps fail, a PCB replacement may be needed.
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Michael JacksonAug 23, 2025
What to do if Optima Scale OP-900B displays ERR2?
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  James FryAug 23, 2025
  If your Optima Scale Accessories displays 'ERR2' during calibration, it means the weight used is below the minimum required weight. The calibration weight minimum is 10% of the maximum capacity set in C04. It is recommended to use 60%-80% of max capacity if possible.
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bruce30Aug 26, 2025
What to do if Optima Scale OP-900B Accessories displays ERR4?
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  stevenswansonAug 26, 2025
  If Optima Scale Accessories displays 'ERR4', it means the signal is unstable during calibration. Ensure the platform is stable before starting the calibration process.
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Mr. Cory Wang Jr.Aug 28, 2025
Why does my Optima Scale OP-900B display nnnnnnn?
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  Nicholas LucasAug 28, 2025
  If the Optima Scale Accessories displays 'nnnnnnn', it could be due to calibration issues. Make sure the scale is level. Another potential cause is a wrong connection with the load cell, so check the load cell connection. Also, the load cell might have a quality problem, so check the load cell input and output resistance.
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scott03Aug 30, 2025
What to do if Optima Scale OP-900B displays ERR1?
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  Terri VelasquezAug 30, 2025
  If your Optima Scale Accessories displays 'ERR1', it indicates that during calibration, either no weight was used, or the weight exceeded the maximum capacity. Use the correct weight within the defined range.
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Michael WilliamsSep 1, 2025
How to fix ERR5 on Optima Scale OP-900B Accessories?
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  Robert MontoyaSep 1, 2025
  If the Optima Scale Accessories displays 'ERR5', this indicates an EEPROM Error. The suggested solution is to change the PCB.
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Nicholas GonzalesSep 3, 2025
What to do if my Optima Scale Measuring Instruments shows UUUUUU?
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  Joseph JacksonSep 3, 2025
  If your Optima Scale Measuring Instruments displays 'UUUUUU', it could be due to several reasons. First, you might be overloading the scale, so reduce the weight. Second, there might be a wrong connection with the load cell, so check the load cell connection. Finally, the load cell itself might have a quality problem; inspect the load cell and check its input/output.
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yadamsSep 5, 2025
Why my Optima Scale Measuring Instruments shows nnnnnnn?
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  Joshua GuerreroSep 5, 2025
  If your Optima Scale Measuring Instruments displays 'nnnnnnn', it could be due to a few potential issues. First, the calibration might be off, so ensure the scale is level. Second, there might be a wrong connection with the load cell, so check the load cell connection. Third, the load cell itself might have a quality problem; check the load cell input and output resistance.
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Adam ChavezSep 7, 2025
What to do if my Optima Scale Measuring Instruments shows ERR3?
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  Sarah JacobsSep 8, 2025
  If your Optima Scale Measuring Instruments shows 'ERR3' during calibration, it indicates that the input signal is negative. Here's what you can do: 1. Check all wire connections. 2. Check the load cell. 3. Recalibrate the device. 4. If the previous steps fail, a PCB replacement may be necessary.

Summary

Calibration Procedure

Single Point Calibration

Procedure for calibrating the scale using a single known weight.

Linear Calibration (Multiple Weights)

Procedure for calibrating the scale using multiple known weights.

RS232 Serial Output Format

Print Mode (C18=2)

Data output format for non-adhesive ticket printers.

Command Request Mode (C18=3)

How to receive ASCII commands for indicator control.

Computer;Remote Display Modes (C18=4, C18=5)

Label Printer Modes (C18=5, C18=6)

4-20 mA Analog Output (Optional)

Troubleshooting

Error Code Solutions

List of error codes, their causes, and troubleshooting steps.

The OP-900 Series Indicator is a versatile digital weight indicator designed for various weighing applications, offering both LED (OP-900A series) and LCD (OP-900B series) display options. It is a Class III digital weight indicator with NTEP approval for 5,000 divisions, ensuring accuracy and reliability in commercial settings.

Function Description:

The OP-900 Series Indicator serves as the central display and control unit for weighing scales. It processes signals from load cells to display weight readings and offers a range of functions including gross/tare/pre-set tare/zero, multiple hold functions, count weighing, and accumulation weighing. It can connect to multiple printers, remote displays/scoreboards, and PCs for data logging. Optional features include relay output and 4-20mA analog output for integration into control systems, as well as wireless capability and a rechargeable battery for enhanced portability and flexibility.

Important Technical Specifications:

Accuracy Class: 5000 e
Resolution: Display: 30,000; ADC: 2,000,000
Zero Stability Error: TK0 < 0.1μV//K
Span Stability Error: TKspn < ± 6 ppm//K
Sensitivity (internal): 0.3 μV / d
Input Voltage: -30 to +30mV DC
Excitation Circuit: 5 VDC, 4-wire connection, supporting up to 6 load cells of 350ohm max
AC Power: AC 100-250V (uses a supplied 9V adapter)
Operation Temperature: -10 °C ~ +40 °C
Operation Humidity: ≤90%RH
Storage Temperature: -40 °C ~ +70 °C (32-104°F)
Dimensions (approximate): 8 inches (width) x 8.5 inches (height) x 3 inches (depth) for the main unit, with a base of 9 inches (width) x 6.75 inches (depth) and a height of 2.75 inches for the stand.
Load Cell Connection: Can connect with up to 6 load cells of 350Ω, supporting both 4-wire and 6-wire connections.
DB9 Serial Connector: Used for RS232 Serial Output (standard), 4-20 mA Analog Output (optional), and Relay Output (optional).
RS232 Serial Output Parameters: 8 data bits, 1 stop bit, no parity, no handshaking. Baud rates from 1200 to 14400.
4-20 mA Analog Output: Voltage sourcing sensor, 4 mA = 0 LBS, 20 mA = 10,000 LBS. Resolution: 1/10000. Outside Load: 100-350ohms.
Relay Output: 4 signals for automatic control and upper/lower limit alarm functions. Rating: AC 250V 3A, DC 30V 3A.

Usage Features:

The OP-900 Series Indicator is designed for ease of use with a splash-proof keyboard and display.

Power On/Off: Hold the power button for 2 seconds. The scale performs an auto-check and countdown before entering weighing mode.
Zeroing: Press the ZERO key to reset the scale to 0 when empty. Manual zero range can be configured.
Unit Selection: Press the UNITS key to switch between measuring units (kg/g/lb/oz/lb:oz).
Tare Function: Press the TARE key to tare the current weight and enter net mode. Hold the TARE key for 2 seconds to input a pre-set tare weight.
Counting Function: Put a sample weight on the scale, press COUNT, select sample number, and press PRINT to confirm. The indicator will then count items.
Accumulation Function: Load a weight, press ACCUM to save, remove weight, press ZERO, add next weight, press ACCUM. To display total, press ACCUM and PRINT together. To clear, hold ACCUM.
Hold Functions: Four types of hold functions are available (C11 parameter):
- Peak Hold: Grabs the highest weight recorded.
- Manual Hold: Holds the current weight until pressed again.
- Auto Hold: Automatically holds stable weights above 20 divisions for 3 seconds.
- Average Hold: Displays the average weight sampled over 3 seconds, useful for animal weighing.
Printing: Press PRINT to print the current stable weight. In accumulation mode, hold PRINT for one second to print the accumulated total.
Parameter Settings: Access a comprehensive menu (C01 to C45) to configure various settings, including weighing unit, decimal setting, graduation, maximum capacity, calibration, power saving mode, hold function, alarm limits, date/time, communication settings, baud rate, zero ranges, tracking, overload range, negative display, standstill time/range, and digital/noise filters.
Calibration: Supports two methods:
- Single Point Calibration: Uses one known weight (at least 10% of max capacity).
- Linear Calibration: Uses multiple (2-7) weights for more accurate calibration.

Maintenance Features:

Battery Management (Optional): For models with rechargeable batteries, fully charge before first use. Fully discharge and recharge monthly to maintain battery health. Remove the battery if not used for a long period to prevent leakage.
- OP-900A: Red light flashes for low battery, solid red for charging, green for fully charged.
- OP-900B: Battery symbol indicates charge level, flashing symbol indicates low battery.
Error Codes: The indicator displays specific error codes (e.g., "uuuuuu" for overload, "nnnnnn" for calibration issues, "Err1" to "Err6" for various calibration and input signal problems) to assist in troubleshooting.
Troubleshooting Guide: The manual provides solutions for common issues such as the scale not turning on, negative readings, and specific error codes, including steps for checking connections, recalibrating, and inspecting components.
Anti-static Prevention: Users are advised to discharge static electricity before opening the protective container to prevent damage to ESDS devices inside.
Professional Maintenance: Calibration inspection and maintenance are restricted to non-professional staff to ensure proper functioning and safety.
Load Cell Connection: Instructions for both quick disconnect and hardwire connections are provided, emphasizing proper wiring and tight screw fixation for terminal blocks.
Software Support: Data logging software is available for RS232 output options.