Welcome
Thank you for choosing Right Weigh. This manual provides instructions for installing and operating your onboard load scale. Right Weigh is committed to making products simple to install and easy to use. Installation may vary between vehicles, and this manual covers general procedures. For questions, the technical support team is available.
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IMPORTANT!
Read instructions COMPLETELY and thoroughly before installation. Right Weigh, Inc. is not responsible for negative consequences due to improper installation or operation, including product failure or damage affecting vehicle integrity. Installation steps are for trained installers; Right Weigh, Inc. is not liable for issues from misinterpretation. End users must be aware of vehicle manufacturer policies regarding modifications. Right Weigh, Inc. is not liable for issues related to warranties with other manufacturers. Refer to the "Warranty Statement" and "Return Policy & Repairs" section and www.rwls.com/warranty for details.
Specifications & Overview
The Right Weigh 201-EBT-02(B) digital load scale features two internal air pressure sensors. It monitors one air suspension axle group with two Height Control Valves (HCV) or two axle groups with one HCV each. An axle group can be a single, tandem, or triple set of axles on a truck or trailer.
Axle Group Configurations:
- One Axle Group with 2 HCVs: Illustration shows an axle group with two Height Control Valves (HCVs).
- Two Axle Groups with 1 HCV Each: Illustration shows two separate axle groups, each connected to one Height Control Valve (HCV).
Drop Axle:
This load scale can monitor an axle group with an air ride lift axle if its air bags are controlled by the same height control valve as the other axles in the group. Setup requires using multiple calibration modes. Refer to the Operating Modes section.
⚠️ Independently regulated lift axles are not part of an axle group and must be in the UP position during calibration and weighing.
Estimated Steer Axle:
The steer axle weight can be estimated if this scale monitors a tractor's drive axle group. Refer to Appendix C for more information.
Illustration shows a tractor with a fifth wheel hitch (checkmark) and a straight truck (cross mark).
⚠️ Estimated Steer is for tractors with a fifth wheel hitch only. It will NOT work on straight trucks or car haulers. Re-calibration is required after changing the position of a sliding fifth wheel. To monitor steer axle weight on a straight truck, the 201-EBT-12B model is needed.
Remote Sensor Feature:
The 201-EBT-02(B) scale can connect to a Right Weigh Remote Sensor installed on a separate vehicle, commonly used in drop & hook situations. This feature requires a separate 403-SK, RTK-01, or RTK-02 kit to connect to a trailer. Refer to the 403-SK Instruction Manual for more information.
Right Weigh Load Scales App:
Scan the QR code to download the "Right Weigh Load Scales" App from the App store. Scan the other QR code for instructions on connecting your scale(s) and using the app, including a video tutorial.
Technical Specifications:
- Operating Temperature: -22° F to +185° F (-30° C to +85° C)
- Storage Temperature: -40° F to +185° F (-40° C to +85° C)
- Power Requirement: 9 VDC to 32 VDC (Switched)
- Units: Pounds (LBS) or Kilograms (KG)
- Housing: High impact polycarbonate blend
- Display: 0.8" sunlight-readable LCD
Diagram shows the scale unit with dimensions and labeled buttons: POWER ON/OFF, MENU, ENTER, (1) CAL HIGH, (2) CAL LOW, (3) DOWN ARROW, (4) UP ARROW.
Scale Installation & Electrical Connections
Choose Location
The 201-EBT-02 scale is designed for exterior mounting on a truck or trailer, within a protective enclosure. A protective box and mounting bracket are included with the 201-EBT-02B. Select a location that is easily accessible and safe from potential damage (e.g., forklift posts, tire caps).
⚠️ DO NOT mount the scale directly to the chassis or any other main beam unless approved by the vehicle manufacturer, as this may void the warranty.
Mount the bracket in the chosen location and install the gauge box to the bracket using supplied hardware.
⚠️ Use BOTH supplied mounting bolts to secure the bracket. Using only one bolt can result in a cracked bracket and the scale falling off.
Dump Air From Suspension System
This step involves releasing air from the suspension system.
Install New Street Tee Fitting
Remove the suspension air line fitting from the top of an air bag. Insert a street tee fitting matching the vehicle suspension's thread size into the air bag. Reinstall the suspension air line and fitting into the street tee. Refer to Appendix A for parts needed.
Diagram shows an air bag with a street tee fitting installed, connecting to the air line.
Install New 1/4" Air Line
Install a new 1/4" air line and fitting into the remaining port on the tee.
Diagram shows an air bag with a street tee fitting and a new 1/4" air line connected.
Route Air Line to Gauge
Route the new 1/4" air line from the tee fitting assembly to the gauge. Secure the air line with zip ties. Insert the air line into the push-to-connect fitting on the back of the gauge. DO NOT ROTATE THE AIR FITTING.
⚠️ The air fittings on the back of the gauge are directly connected to the internal circuit board. Applying voltage to air fittings will cause immediate air sensor failure!
Repeat Steps 3-5 With Second HCV
For a second air line, connect from the second HCV's air bag to fitting B on the back of the gauge. For a dedicated tractor-trailer set, fitting A connects to the drive axle group and fitting B connects to the trailer axle group.
Diagram shows two HCVs connected to air bags, with lines running to fittings A and B on the scale gauge.
Install Power Cable
If using the Remote Sensor Feature, follow the 403-SK installation manual instead.
Diagram shows a connection harness with RED (POWER) and BLACK (GROUND) wires.
Insert the male connector on the harness onto the female connector on the back of the scale, ensuring proper orientation. Thread the collar until hand tight. Connect the RED wire to a switched positive (+) power source and the BLACK wire to chassis ground (-). The required supply voltage is 9-32 VDC. Refer to Appendix B for wiring connection and insulation.
⚠️ DO NOT connect directly to a battery or constant power source. Connect to a switched source (e.g., vehicle marker lights or AUX/ABS wire) that can be disconnected when not in use. Electrical connections MUST be insulated.
Operating Modes
Each vehicle configuration requires a specific operating mode. Available modes include:
- AVG - Tractor or Trailer, One Axle Group
- S-AVG - Tractor Drive's and Estimated Steer
- 4CAL - Trailer, One Axle Group with Multiple Configurations
- IDP - Two Axle Groups
- S-IDP - Tractor Drive and Trailer Axle Groups and Estimated Steer
Refer to the tables for your vehicle configuration to set the corresponding operating mode.
⚠️ The load scale can only be set to one operating mode at a time. Changing the mode resets calibration data to factory defaults, requiring re-calibration.
If using the Remote Sensor Feature, enable it before setting the operating mode. See the 403-SK Instruction Manual (PP-003-0084) for details.
Changing Operating Modes:
- With the scale OFF, press and hold the UP and DOWN arrow buttons, then press the ON/OFF button. Release all buttons. The scale displays the current mode.
- Press the UP arrow button to cycle through modes. Turn the scale OFF by pressing the ON/OFF button to confirm your selection.
Diagrams illustrate the button presses and display changes for changing modes.
Tractor Configurations:
- Axle Group 1 - Estimated Steer, Axle Group 2 - Air Suspension Single, Tandem, or Tri Axle Group (1 HCV): For this configuration, the operating mode is S-AVG. Illustration shows a tractor with an estimated steer axle and one drive axle group with one HCV.
- Axle Group 1 - Air Suspension Single, Tandem, or Tri Axle Group (2 HCV): For this configuration, the operating mode is AVG. Illustration shows a tractor with one drive axle group with two HCVs.
The numbers on the images indicate axle groups displayed on the gauge. Press MENU to cycle through axle groups.
Dedicated Tractor-Trailer Set Configurations:
- Axle Group 1 - Estimated Steer, Axle Group 2 - Drive Axle Group, Axle Group 3 - Trailer Axle Group (1 HCV each): For this configuration, the operating mode is S-IDP. Illustration shows a tractor with an estimated steer axle, a drive axle group, and a trailer with one axle group, each with one HCV.
- Axle Group 1 - Drive Axle Group, Axle Group 2 - Trailer Axle Group (1 HCV each): For this configuration, the operating mode is IDP. Illustration shows a tractor with a drive axle group and a trailer with one axle group, each with one HCV.
Trailer / Dolly Configurations (4CAL Mode):
In 4CAL mode, the scale stores four calibration data sets for trailers with various operating conditions.
- Air Suspension Single, Tandem, or Tri Axle Group (2 HCV) with 1 Integrated Air Ride Lift Axle: Calibration set "1" is for the lift axle UP, and set "2" is for the lift axle DOWN. Illustration shows a trailer with one lift axle.
- Air Suspension Single, Tandem, or Tri Axle Group (2 HCV) with 2 Integrated Air Ride Lift Axles: For some 4-axle heavy-haul trailers with two fixed axles, a lift axle, and a flip axle on the same HCV, operators use calibration set "1" for two axles down, "2" and "3" for three axles down, and "4" for all four axles down. Illustration shows a trailer with two lift axles.
Calibration & Unit of Measure
Changing Units:
With the gauge on, press and hold the UP ARROW, then press the MENU button to toggle between pounds and kilograms.
Calibration:
The 201-EBT-01(B) load scale must be calibrated both empty and loaded. The scale associates entered weight with air pressure at calibration time. Calibrate once when empty and again when loaded for each axle group.
⚠️ Only enter on-the-ground weight of the axle or group being monitored. DO NOT use gross weight, tare weight, etc.
Empty Calibration Point:
- While the vehicle is empty, obtain axle group weights from a certified in-ground scale.
- Park on a level surface. Shift transmission to neutral, set parking brakes, chock wheels, then release parking and service brakes.
- Ensure the Height Control Valve (HCV) has fully inflated air bags. If needed, briefly dump air from the suspension and allow the HCV to refill.
- Press the ON/OFF button to turn on the scale.
- Press the blue MENU button to select the proper axle group or calibration set.
- Press and hold the C LOW button until the "C/L" symbol appears.
- Adjust the value using the UP and DOWN arrows to match your scale ticket for the axle group.
- To save, press and hold the C LOW button until the "C/L" symbol disappears.
- Repeat steps 5-8 for all axle groups or calibration sets.
Loaded Calibration Point:
- Repeat "empty calibration point" steps 1-3 with the vehicle fully loaded.
- Press the ON/OFF button to turn on the scale.
- Press the blue MENU button to select the proper axle group or calibration set.
- Press and hold the C HIGH button until the "C/H" symbol appears.
- Adjust the value using the UP and DOWN arrows to match your scale ticket for the axle group.
- To save, press and hold the C HIGH button until the "C/H" symbol disappears.
- Repeat steps 5-8 for all axle groups or calibration sets.
Re-Calibration:
It is recommended to re-calibrate every 6 months for each axle group being measured.
Set Security PIN Code (Optional)
Setting a security PIN code is optional. Once set, the 5-digit number is required for calibration. The PIN code cannot be removed after being set. Contact Right Weigh Technical Support to remove a PIN.
Set PIN Code:
With the gauge off, press and hold both C LOW and C HIGH buttons, then press ON/OFF. Release all buttons. The gauge displays "CodE".
Press MENU; "00000" displays. Enter a 5-digit PIN using buttons 1, 2, 3, and 4. Press MENU again to save.
**If the display shows "-----", a code is already set.
Change PIN Code:
With the gauge off, press and hold both C LOW and C HIGH buttons, then press ON/OFF. Release all buttons. The gauge displays "CodE".
Press MENU; "-----" displays. Enter the previous PIN. If correct, "Good" displays.
Press MENU and enter the new 5-digit PIN using buttons 1, 2, 3, and 4. Press MENU again to save.
Operate & Weigh
Follow these steps while weighing your vehicle:
- Park on a level surface. Shift transmission to neutral, set parking brakes, chock wheels, then release parking and service brakes.
- Ensure the Height Control Valve (HCV) has fully inflated air bags. If needed, briefly dump air from the suspension and allow the HCV to refill (may take several minutes).
- Press the ON/OFF button to turn on the Right Weigh load scale.
- Adjust the suspension or load until the scale displays a weight value below your legal limit.
- Press the blue MENU button to display other axle groups or calibration sets.
- Press the ON/OFF button to turn off the scale.
Troubleshooting
| PROBLEM | CAUSE | SOLUTION |
|---|---|---|
| Erratic / Inaccurate Weight Readings | The vehicle is not parked on a level surface | Park on level concrete ground. Parking on sloped or banked surfaces shifts weight distribution. Wheels in potholes can cause additional pressure/torque on air bags, leading to inconsistent air pressure. |
| Erratic / Inaccurate Weight Readings | The vehicle's brakes are on | Release parking brakes when weighing/calibrating. Set brakes can apply additional pressure/torque on air bags, causing inconsistent air pressure. |
| Erratic / Inaccurate Weight Readings | There is a significant air leak in the suspension system | Check air lines for leaks. Leaks can cause the HCV to refill suspension periodically. A significant leak may cause the gauge to display decreasing values, then increasing values when the HCV refills. |
| Erratic / Inaccurate Weight Readings | The Height Control Valve (HCV) is malfunctioning or broken | If the HCV is not functioning correctly, air pressure applied to the suspension may be inconsistent. To test: get a weight reading, drive around the block, return, and get another reading. Significant differences indicate a potential HCV problem. |
| Gauge reading "noAir" | One or more air inputs are not receiving air (If 2 air sensors are set to Average mode and one isn't receiving air, gauge will read noAir message) | Check that all air inputs are receiving air. Pull airline out of air fitting(s) on the back of the gauge. Follow the airline to the airbags to check for pinching or damage. Dump suspension and refill to ensure air bags are full. |
| Gauge reading "noAir" | Lift Axle being measured is in the up position | If a lift axle is measured and is in the up position, its air bags will be deflated, causing the "noAir" message. |
| App Won't Connect to the Gauge | Scale is connected to a constant power source | Connect the scale to a switched power source (9-32 VDC, e.g., marker lights or AUX/ABS wire). If powered too long, it can stop transmitting Bluetooth signals and may need to be disconnected/reconnected. |
| App Won't Connect to the Gauge | Scale is connected to another device | Disconnect the scale from the other device before connecting through your device. |
| App Won't Connect to the Gauge | Phone requires re-set | To reset: close the app, turn off Bluetooth, wait 10 seconds, turn Bluetooth back on, and try rescanning. Restarting the phone may also be necessary. |
| Gauge Will Not Calibrate Low/High | Air pressure in the system is not changing | To enter low/high cal mode, the gauge needs to see a measurable change in air pressure. Calibrate high when near legal limit, low when empty. Ensure the air line is connected directly to an air bag, NOT the main air supply or brake system. |
| Scale Does Not Power On | Scale is not connected to a switched power source of between 9 and 32 VDC | Connect to a switched power source (9-32 VDC, e.g., marker lights or AUX/ABS wire). A bad connection causing voltage drop below 9 volts will prevent power-on. Test power source with a voltmeter. |
| Scale Does Not Power On | Scale is connected directly to the battery | Connect to a switched power source (9-32 VDC, e.g., marker lights or AUX/ABS wire). The scale is active when powered, even if the display is off. To reset, disconnect/reconnect power, wait 10 seconds, then try turning the display on. |
| Scale Does Not Power On | Polarity is incorrect | Correct the polarity. Connect the RED wire to positive (+) and the BLACK wire to negative (-). |
| Cannot Change Calibration Data | The scale has an active user-defined security PIN code | The PIN must be entered before calibration data can be changed. See page 16 for PIN reset instructions. Contact Right Weigh technical support if the PIN is forgotten. |
Appendix A: Additional Parts
The following are suggested additional parts for air line installation. Check with your Right Weigh dealer for optional installation kits.
- 1/4 Inch Air Line: Approximately 20 to 30 feet (6 to 9 meters).
- 20 or more Zip Ties.
- Male Straight Fitting: Air line fitting for 1/4" air line, with a thread size to match the street tee fitting. Diagram shows a male straight fitting.
- Street Tee Fitting: The thread size should match the air bag fitting (e.g., 1/4" NPT or 3/8" NPT). Diagram shows a street tee fitting.
Appendix B: Wiring Insulation
Ensure all wiring connections are watertight to prevent moisture damage to electronics. Heat shrinkable splices are included in the 201-SK Installation Kit.
Step 1: Crimp each end of the wire into the connector using a wire crimp tool (not provided).
Step 2: With a heat gun or torch, heat the connector until it shrinks completely around each wire end. Do not burn the wire jacket.
Step 3: After all connections are made, heat shrink the entire group of splices to seal the outer jacket of both cables.
Diagrams illustrate the crimping, heat shrinking of individual splices, and final heat shrinking of the cable group.
Appendix C: Estimated Steer
"Estimated Steer" calculates steer axle weight based on drive axle air pressure. No sensors or air bags are needed on the steer axle. This method can be more accurate than using air or strain sensors because weight on a fixed position 5th wheel is predictable.
After calibration, the Right Weigh gauge calculates the typical steer axle weight per pound on the drive axle group.
Illustration shows a tractor with a fifth wheel hitch (checkmark) and a straight truck (cross mark).
Estimated Steer may not reliably work for straight trucks, car haulers, or those who frequently slide their fifth wheel, as the weight applied to the drives is inconsistent.
Calibration:
Enter steer axle weight data (empty and loaded) the same way as any other axle group. Based on this data and the drive axle group measurement, the scale calculates your steer axle weight.
⚠️ Re-calibration is required after changing the position of a sliding fifth wheel.
Warranty & Return Policy
Right Weigh, Inc. warrants products to be free from significant defects in material and workmanship for 3 years from the date of purchase. This warranty covers product correction or replacement at Right Weigh's discretion, within the warranty statement's boundaries.
This warranty does NOT cover problems resulting from:
- Improper application, installation, incorrect wiring, or operation outside specifications.
- Accidents, faulty suspension parts, or power surges.
- Inadequate maintenance or preparation by the buyer/user.
- Abuse, misuse, or unauthorized modification.
- Acts of God (lightning, floods, fire, earthquake, etc.).
Right Weigh, Inc. assumes no responsibility or liability for loss or damages resulting from product use. Liability is limited to the original product cost. Right Weigh, Inc. reserves the right to make product improvements without notice.
Return Policy and Authorization:
To return a product, obtain a Return Merchandise Authorization number (RMA#) by calling Customer Service at 503-628-0838 or emailing support@rwls.com. Include the RMA# and reason for return. Shipping costs are prepaid by the customer. Pack items carefully to prevent damage and insure against loss. Right Weigh, Inc. is not responsible for shipping damage due to insufficient packing or loss in transit.
An RMA# is required from the original purchaser. Only new, unused products may be returned. Installed, used, damaged, modified, or customized products cannot be returned for credit. Credit is issued after evaluation by Right Weigh, Inc.
Repairs/Replacements:
An RMA# is required. Right Weigh, Inc. will evaluate returned products at no charge. If under warranty, the product or parts will be repaired or replaced at no charge. If unrepairable, it will be replaced with an equivalent product. Right Weigh, Inc. will cover return shipping. Products not covered by warranty will be repaired or replaced at the customer's expense upon authorization.
Thank You
Thank you for choosing Right Weigh. We are committed to making our products simple to install and easy to use. Our technical support team is ready to answer your questions.
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Right Weigh | Onboard Load Scales
