Initial Setup and
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Step 1: Download the App

Download the app from the Apple App Store or Google Play by searching for Libra Cart.

Step 2: 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.

Libra Cart Model: M0010, M0011, M0012 - 3.6V AA lithium only
Libra Cart Model: M0013, M0014 - 1.5V or 3.6V AA lithium (3.6V recommended) and/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, tightening the screws completely.

Step 3: Install the Device

Mount Libra Cart to the front of the grain cart, preferably protected from direct exposure to the elements with its connector pointing downward. Connect the cable of the cart's load cell junction box to the Libra Cart's connector, securing any excess cable.

Step 4: Pair the Device

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.
Step 5: Determine Your Load Cell Information

All load cells installed on the mixer 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 or visit the support page for help retrieving the calibration number on some indicators.

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 TOTAL 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 on the grain cart.
Step 6: Configure the App

1. Ensure the Libra Cart device and app are paired and connected.
2. 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, you can now calibrate. If the load cells agree but are roughly half than expected, double the Rated Capacity entered previously. If weights do not agree, check wiring and load cell orientation.
Step 7: Calibrate

1. Ensure the Libra Cart device and app are paired and connected.
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 on the Display tab and 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.
10. Tap Save Settings.