Installing and calibrating a tank monitor

Your tank monitor is designed to provide real-time insights into fuel levels and system status, helping you manage your assets efficiently and reduce manual checks.
The installation process is straightforward, and this article will walk you through each step, from preparing the tank monitor system to viewing and calibrating your data.

Hint!

The processes for installing and calibrating the tank are fully integrated into the Calculus Configurator Tool, which you can find at https://install.calculus.group/. For detailed instructions on how to use the Configurator Tool, read the following article: Calculus configurator manual.

If you’re using a different tank monitor than the model shown above, you may be using an older model.
Check the wiring diagram to find the correct instructions for the following models:

• Digital Matter Hawk

• Digital Matter Falcon

• Digital Matter Eagle

Each model may have slightly different installation and configuration procedures, so make sure you’re referencing the correct article.

Hint!

If you’re unsure which type of gateway you have, remove the lid and look for the white label on the circuit board.

The label lists the model name, which will help you identify the correct article.

Preparing the tank monitor for installation

Your tank monitoring system arrives fully assembled and ready for setup. The monitoring module comes with the SIM card and batteries pre-installed, so you can begin the installation process right away.

Please note that the level sensor shown in the packaging may vary depending on the specific model you ordered. This sensor must be connected to the monitoring module before use. Follow the connection steps carefully as outlined in the installation instructions provided with your unit.

Before proceeding, we recommend:

• Verifying that all components are included and undamaged.

• Reviewing the installation diagram that matches your sensor type.

• Ensuring you have the necessary tools for mounting and connecting the sensor.

Connecting the level sensor

The correct connection of the level sensor is essential for accurate measurements.
Depending on your sensor model, the type of fluid in the tank, and the software configuration, the connection procedure may vary.

Follow the installation guide specific to your sensor type to ensure proper setup. Make sure all connectors are secure and that cables are not bent or damaged during installation.
In the wiring instruction below, we only show one specific case. If you are using different sensors or a different plug-in board, you can find the wiring diagrams in a dedicated article.

Wiring instructions for a fuel- and water sensor or an optional AdBlue sensor

Fuel- and water sensor

• White wire (Voltage) → I/O2 +VBOOST OUT

• Brown wire (4-20mA) → I/O9 4-20mA

AdBlue sensor (optional)

• Red wire (Data) → I/O1 AIN1

• Black wire (Power supply 3.3 V) → I/O5 +3.3V Out

• White wire (GND) → I/O6 SWGND

Important!

Each measurement module must be equipped with the appropriate software configuration for its intended application. For example:

• A module configured for a fuel sensor uses a different software setup than one configured for an AdBlue sensor.

• Using the wrong configuration can result in inaccurate readings or communication errors.

If you are unsure about your configuration, or if you would like to use the system for combination measurements (e.g., multiple sensor types), please contact Calculus Support before proceeding. Our team will be happy to assist you in selecting or updating the correct configuration.

Activating the batteries

Before using your monitoring module, you’ll need to remove the battery strip to activate the batteries.
Once the batteries are activated and the module is inserted, the LED indicator located next to the GPS antenna will flash briefly. This confirms that the module has powered on correctly.

If the LED does not flash after activating the batteries:

• Remove the batteries from the module.

• Leave them out for at least five minutes to allow any residual charge to dissipate.

• Insert the batteries, ensuring they are placed correctly according to the polarity markings.

• Check again for the LED flash to confirm a successful activation.

If the LED still does not blink after repeating these steps, please contact Calculus Support for further assistance.

Installing the tank monitor

The gateway can be securely mounted to the object you wish to monitor using screws, bolts, cable ties, or industrial adhesives, depending on your setup and the surface type.
Before selecting a mounting location, please take the following factors into consideration:

1. Choose a mounting point that minimizes the risk of accidental mechanical damage
   Many customers prefer to install the module inside the tank for added protection. However, please note that the metal housing of some tanks can interfere with GPS or data transmission.

2. Optimize reception and ventilation
   Mount the gateway in a location with strong GPS and mobile network reception. Ensure there is adequate ventilation and free space around the module to prevent overheating or interference.

3. Use the correct sensor for each fluid
   Always use a fuel sensor exclusively for fuel applications. Do not use it for other liquids such as AdBlue, as this may cause incorrect readings or sensor damage. Dedicated sensor types are available for AdBlue and other fluids. Contact Calculus Support for more information.

4. Installing the hydrostatic pressure sensor
   Allow the sensor to hang freely through a tank opening so that it reaches just above the tank bottom. To prevent cable strain or breakage, it is best to secure the sensor cable using a riser pipe or similar support structure.

5. Activation and configuration
   Once powered on, the module will automatically connect to the online platform and update itself with the pre-programmed configuration assigned to your device.

   This process may take a few minutes, depending on network strength.

Reception and Battery Life

When operating the gateway in battery-powered mode, optimal reception is crucial.

Poor signal quality can lead to reduced performance and shorter battery life, as the module will attempt repeated transmissions.

Always verify that the chosen mounting position provides consistent signal strength before finalizing installation.

Viewing data

Each tank monitor has a unique serial number, which you can find on the label printed on the module housing.

You can view the data of you tank monitor on the Calculus Portal.
Navigate to Dashboards.
Enter the serial number of your tank monitor in the search bar.
Select your device from the list to open its dashboard.

Using the dashboard, you can quickly check whether your device is online or offline by viewing the activity indicator:

🟢 Green – The device is online and actively sending data.

⚪ Gray or 🔴 Red – The device is currently offline or not transmitting data.

If your device shows as offline, it may be due to temporary network coverage issues or the activation process still completing.

Hint!

After removing the battery strip and activating the device, it may take a few minutes before the first data appears on the platform.

This delay is normal while the module connects to the network and uploads its initial readings.

Installation and calibration with the Calculus Configurator Tool

To ensure accurate level measurements, your tank monitor must first be calibrated. This is necessary for the system to correctly interpret the sensor data and convert it into real-world volume readings.

The processes for installing and calibrating the tank are fully integrated into the Calculus Configurator Tool, which you can find at: https://install.calculus.group/.

For detailed instructions on how to use the Configurator Tool, read the following article: Calculus configurator manual.

Performing a new installation

Open the Calculus Configurator Tool and start a new installation. Complete all the steps presented to you by the Configurator Tool. The calibration step is part of this flow, which is detailed below.

Three methods of calibration are available:

Finish the remaining steps of the installation flow.

Attention!

After calibrating the tank, the updated volume will not appear immediately. The correct volume will be shown on the dashboard when the next measurement is received.

Also, liquids expand when they warm up, and contract when they cool down. For this reason, it is possible that a tank, after an initial calibration during the summer, needs to be recalibrated when refilled during the winter period. If, after a refill, you receive an unexpected notification that the tank needs to be calibrated, consider this reason.

The recalibration process is also integrated into the Calculus Configurator Tool, read the following article: Recalibrating a tank monitor.

Closing the case

When all above steps are completed, you can close the gateway housing.

1. Position the lid correctly on top of the gateway.

2. Gently press it down until it fits snugly. The foam layer inside the lid should press lightly against the batteries. This keeps them securely in place, even when the device is moved or turned over.

3. Tighten the eight screws evenly, using a cross pattern (gradually tighten opposite corners in sequence) to ensure a uniform seal. The screws may feel stiff during the first assembly, this is normal.

Check Lid Orientation

Before tightening the screws, verify that the lid is correctly positioned.

The foam insert must be on the inside, directly above the batteries.

If the lid is attached upside down or misaligned, it can damage the gateway or prevent it from sealing properly.