1. Introduction and Overview
This manual provides essential instructions for the proper setup, operation, and maintenance of your Ohaus Defender 3000 Bench Scale, Model D31P15BR. Please read this manual thoroughly before using the scale to ensure accurate and safe operation.
Image 1.1: Ohaus Defender 3000 Bench Scale, Model D31P15BR. This image displays the complete bench scale unit, including the weighing platform, support column, and digital indicator.
Key Features:
- Capacity: 33 lb / 15 kg (depending on calibration unit used).
- Resolution: 1:6000 to 7500d; NTEP certified and Measurement Canada approved to 3,000e.
- Construction: 304 stainless steel pan with painted carbon steel frame and aluminum IP67 load cell.
- Indicator: High-impact durable ABS plastic housing with a reversible face for wall, column, or table-top mounting.
- Stability: Adjustable non-slip rubber leveling feet with an externally visible level indicator.
2. Setup
2.1 Unpacking and Inspection
Carefully remove all components from the packaging. Inspect the scale for any signs of damage that may have occurred during transit. Retain packaging materials for future transport or storage.
2.2 Placement
Place the scale on a stable, level surface free from vibrations, drafts, and extreme temperature changes. Ensure adequate space around the scale for operation and maintenance.
2.3 Leveling the Scale
- Locate the bubble level indicator, typically found near the indicator or on the base.
- Adjust the four non-slip rubber leveling feet by turning them clockwise or counter-clockwise until the bubble is centered within the indicator circle. This ensures accurate weighing.
2.4 Indicator Mounting
The indicator features a reversible face and can be mounted in several configurations:
- Column Mount: Attach the indicator to the provided column using the appropriate hardware.
- Wall Mount: Secure the indicator to a wall using suitable fasteners (not included) through the designated mounting points.
- Table-Top Mount: Position the indicator on a flat surface next to the weighing platform.
Ensure all connections between the indicator and the weighing platform are secure before proceeding.
3. Operation
3.1 Powering On/Off
Connect the scale to a suitable power source. Press the ON/OFF button on the indicator to power the scale on or off. The backlit liquid crystal display (LCD) will illuminate upon startup.
3.2 Basic Weighing
- Ensure the scale is powered on and displays "0.00" or a stable zero reading. If not, press the ZERO button.
- Carefully place the item to be weighed onto the center of the stainless steel weighing pan.
- Wait for the reading on the display to stabilize. The displayed value represents the weight of the item.
- Remove the item from the pan. The display should return to zero.
3.3 Taring (Subtracting Container Weight)
To weigh an item in a container, use the Tare function:
- Place the empty container on the weighing pan.
- Press the TARE button. The display will show "0.00" and a "T" or "NET" indicator, indicating the container's weight has been tared out.
- Place the item to be weighed into the container. The display will show only the net weight of the item.
- Remove both the item and container. The display may show a negative value equal to the tared weight. Press ZERO to return to zero.
4. Maintenance
4.1 Cleaning
Regular cleaning helps maintain the scale's performance and longevity. The weighing pan is made of 304 stainless steel, and the indicator housing is high-impact ABS plastic.
- Wipe the scale surfaces with a damp cloth and a mild detergent.
- Do not use abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish or internal components.
- Ensure no liquids enter the indicator housing or the load cell area. Although the load cell is IP67 rated for dust and water ingress, proper care is recommended.
- Always disconnect the scale from the power source before cleaning.
4.2 Calibration
The Ohaus Defender 3000 Bench Scale is factory calibrated. However, periodic calibration may be required to maintain accuracy, especially after relocation or significant temperature changes. Refer to the full technical manual for detailed calibration procedures or contact authorized service personnel.
5. Troubleshooting
If you encounter issues with your scale, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Scale does not power on | No power supply; loose cable | Check power connection; ensure outlet is functional. |
| Inaccurate readings | Scale not level; drafts; calibration required | Level the scale; move to a stable environment; perform calibration. |
| Display shows "OVERLOAD" | Weight exceeds capacity | Remove excess weight immediately. |
| Unstable readings | Vibrations; air currents; damaged load cell | Relocate scale; shield from drafts; contact service if persistent. |
For issues not listed here or if problems persist, please contact Ohaus customer support or an authorized service technician.
6. Specifications
Detailed technical specifications for the Ohaus Defender 3000 Bench Scale Model D31P15BR:
| Specification | Detail |
|---|---|
| Brand | Ohaus |
| Model Number | D31P15BR (Manufacturer Part Number: 30369116) |
| Capacity | 33 lb / 15 kg |
| Readout Accuracy | 0.005 lb (2 g) |
| Resolution | 1:6000 to 7500d; NTEP certified to 3,000e |
| Display Type | Backlit Liquid Crystal Display (LCD) |
| Weigh Scale Type | Counter Scale |
| Measurement Type | Imperial / Metric |
| Material (Pan) | 304 Stainless Steel |
| Material (Frame) | Painted Carbon Steel |
| Material (Load Cell) | Aluminum, IP67 rated |
| Material (Indicator Housing) | Acrylonitrile Butadiene Styrene (ABS) |
| Item Weight | 33 Pounds |
| Special Features | Adjustable Leveling Feet, NTEP Certification, Reversible Indicator Face |
7. Warranty and Support
For detailed warranty information, please refer to the official warranty statement provided with your product or visit the Ohaus website. Keep your purchase receipt as proof of purchase.
For technical support, service, or spare parts, please contact your local Ohaus representative or visit the official Ohaus support portal. Provide your model number (D31P15BR) and serial number when requesting support.