Step 1: Install the Battery
Ensure there is a fresh battery inserted in the Libra Cart device before each harvest season. Contact your
dealer or visit our
website for
replacement batteries. See below for battery type needed based on model number.
M0010, M0011, M0012: 3.6V AA lithium only
M0013: 1.5V or 3.6V AA lithium (3.6V recommended)
M0014: 1.5V or 3.6V AA lithium (3.6V recommended) or 12V vehicle power.
M0016: 1.5V or 3.6V AA lithium (3.6V recommended) or 12V vehicle power.
1.Remove the lid of Libra Cart.
2.For first-time operation, remove the insulator pull-tab.
3.Ensure that the battery is well seated with correct polarity.
4.Secure the lid by hand tightening the screws completely.
Step 2: Install the Device
Mount the Libra Cart device to the front of the grain cart with its black connector(s) pointing downward, preferably protected from direct exposure to the elements. Connect the cart’s load cell junction box and optional moisture sensor cables to the device.
12-volt powering options (M0014/M0016):
If you have a 12-volt vehicle battery power cable, you can connect it to the device's power connector. Cover any unused connector ports with the supplied caps. Secure any excess cable.
WARNING: Vehicle battery connection shall be in accordance with all vehicle safety instructions including but not limited to protective fusing and wiring specifications.
Pair directly through the Libra Cart app and NOT through the general smartphone/tablet Bluetooth settings.
1. Ensure Bluetooth is enabled on your mobile device.
2.Bring the mobile device to the Libra Cart device and launch the Libra Cart app.
3. Select the Settings tab inside the app. For the tractor's mobile device, ensure Primary Display is selected. Pairing a remote display should only be done AFTER the primary display has been paired.
4. Tap + to add your new Libra Cart device to the app, and wait for the scan to finish.
5. Once successfully paired, type a name to identify your cart and tap Done on the keyboard.
Troubleshoot Connections
If you have problems connecting to the Libra Cart device, please ensure each of the following:
1. Bluetooth is enabled in your smartphone/tablet settings.
2. The Bluetooth icon is visible in the status bar across the top of your screen. If not, reboot the mobile device.
3. Your Libra Cart device is selected from the list of Paired Devices in the Settings tab (tap to select).
4. The Bluetooth icon is black to indicate that the pair are actively communicating. If not, delete the paired device and re-pair.
5. Primary Display is selected in the app settings for the main mobile device; Remote Display for mobile devices acting as remote displays.
6. There are no other mobile devices paired to the Libra Cart device.
7. The battery is properly inserted in your Libra Cart device. If problems persist, remove the battery, wait 30 seconds, and then reinsert. If using the 12V power, ensure the cable is connected and secured.
Step 4: Finding Load Cell Ratings
All load cells installed on the cart MUST have identical ratios of sensitivity to capacity (sensitivity/capacity). This is true if all load cells are of the same model and should be checked otherwise.
Using the calibration number from an existing indicator:
Find and note the calibration number of your existing indicator as the Rated Capacity (lb), and use 0.40 mV/V as the Sensitivity. Please consult the existing indicator's user manual for help retrieving the calibration number. Go to Step 5.
In all other cases:
Read and note the Sensitivity (Rated Output) and Rated Capacity (Rated Load) from any one load cell on the grain cart. Multiply the Rated Capacity by the number of load cells on the grain cart. If specifications are unavailable, a good starting point is a Sensitivity of 0.40 mV/V and a Rated Capacity of 8000 lb multiplied by the total number of load cells. If you need assistance, please contact your dealer.
Step 5: Storing Load Cell Ratings
1. Ensure the Libra Cart device and app are paired and communicating.
2. Select the Settings tab and ensure units (lb, kg) are set to those of the Rated Capacity found previously.
3. Select the Device tab and enter the Sensitivity and Rated Capacity noted previously.
4. Enter the Calibration Factor as 1.0.
5. Tap Save Settings.
6. Tap Zero Scale.
7. Select the Display tab and tap Tare.
8. Apply a known weight (perhaps your body weight) to one of the cart's load cells, recording the displayed weight. Repeat with each remaining load cell. If the load cells agree and are roughly correct, Go to Step 6 (Calibration). If the load cells agree but are roughly half of that expected, double the Rated Capacity entered previously. If weights do not agree, check wiring and load cell orientation. If you need assistance, please contact your dealer.
Step 6: Calibration
1. Ensure the Libra Cart device and app are paired and communicating.
2. Ensure the grain cart is empty and on level ground.
3. Select the Device tab and tap Zero Scale.
4. Select the Display tab and fill the grain cart.
5. Tap Tare then unload the cart into an empty truck, noting the amount unloaded (record as positive).
6. Weigh the load with a trusted scale.
7. Select the Device tab and enter the weight from the trusted scale as the Certified Reading.
8. Enter the noted weight from the app as the Cart Reading.
9. Tap Calculate to compute a new Calibration Factor.