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.
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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:
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
Fuel- and water sensor | AdBlue sensor (optional) |
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:
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.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.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.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.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.
Upon activation, the module will connect to the online platform and update itself with a pre-programmed configuration.
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.
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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.
Within 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.
Calibrating the tank monitor
To ensure accurate level measurements, your tank monitor must be calibrated once the tank is completely filled.
Calibration allows the system to correctly interpret the sensor data and convert it into real-world volume readings.
Follow the steps below to perform the calibration:
Step 1: Open the Tank Dashboard
Navigate to the Dashboard of the tank you want to calibrate.
Scroll down until you find the widget titled Max Raw Sensor Data in Period.
This widget shows the maximum raw sensor value recorded for the selected period.
Make sure the tank is completely full before taking this value.
Step 2: Enter calibration data
You can adjust the calibration values from the tank dashboard, using the Metadata widget, located under the Troubleshooting & configuration section.
The values below are used by the system to calculate the fill level as a percentage and display accurate volume readings:
TankLiter
The total capacity of your tank in liters. For example: If your tank holds 300 liters, enter 300.Tank100pct
The sensor’s raw value when the tank is completely full. Enter the value shown in the Max Raw Sensor Data in Period widget from the dashboard, without “.” or “,”.
If an AdBlue tank is present, also set the following values:
AdBlueTankLiter
The total capacity of your AdBlue tank in liters. For example: If your tank holds 300 liters, enter 300.AdBlueTank100pct
The sensor’s raw value when AdBlue the tank is completely full. Enter the value shown in the Max Raw Sensor Data in Period widget from the dashboard, without “.” or “,”.
Hint!
It’s best to perform calibration immediately after refilling the tank completely, ensuring that the Max Raw Sensor Data value truly represents a 100% full level.
After saving your entries, the system will automatically update the tank’s level calculations based on your input.
You can calibrate your tank even if it isn’t completely full.
By entering a few key values, you can create an estimated calibration, which can later be fine-tuned when the tank is filled to its maximum capacity
To perform an estimated calibration, please provide the following information:
Current tank level
Enter the current fuel level in the tank. You can use either:
Total volume (liters), or
Total height (cm)
If using height, measure from the bottom to the top of the usable tank volume.
Do not include tank feet, supports, or unused top sections.
If the tank is installed inside another tank or container, use the dimensions of the inner tank.
Important!
Use either volume values OR height values. Do not mix them.
Latest raw sensor value
Enter the latest raw sensor value.
You can find this value at the bottom of the Tank Dashboard. It represents the sensor’s most recent uncalibrated measurement.
Fill in these values in the calibration table below and generate an estimated calibration curve.
Hint!
After performing an estimated calibration, we recommend recalibrating the tank again when it is completely filled to ensure the most accurate measurements.
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.
Closing the case
When all above steps are completed, you can close the gateway housing.
Position the lid correctly on top of the gateway.
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.
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.