Calculus supports various applications using a Digital Matter Hawk module.
Depending on the application, for example tank monitoring or level measurement, the following things differ per application:
Software calibration for the Hawk module.
Sensors, for example a water sensor, diesel sensor or AdBlue sensor.
Number of physical connections to the Hawk module.
For your convenience, we have compiled the most common use cases:
Connecting the sensors
Watermeter: Reed switch
Wiring instructions
Green wire → I/O7 DIN1
White wire → VIN
Watermeter: H2Q
Wiring instructions
Red wire → I/O7 DIN1
Blue wire → GND
Black wire (Battery) → GND
Ratiometric sensor: BD Sensor 5V
Wiring instructions
Green wire (Data) → I/O1 AIN1
White wire (Power supply 5V) → I/O2 +VBOOST OUT
Brown wire (GND) → I/O6 SWGND
Ratiometric sensor: Huba sensor 3.3V
Wiring instructions
Green wire (Data) → I/O1 AIN1
Brown wire (Power Supply 3.3V) → I/O5 +3.3 V Out
White wire (GND) → I/O6 SWGND
Ratiometric sensor: Keller sensor 3.3V
Wiring instructions
Red wire (Data) → I/O1 AIN1
Black wire (Power supply 3.3 V) → I/O5 +3.3 V Out
White wire (GND) → I/O6 SWGND
4-20mA sensor: BD 18.605G
Wiring instructions
White wire (Voltage) → I/O2 +VBOOST OUT
Brown wire (4-20mA) → I/O9 4-20mA
4-20mA sensor: combined with Ratiometric sensor
Wiring instructions 4-20mA (AdBlue tank)
Black wire (Voltage) → I/O2 +VBOOST OUT
Brown wire (4-20mA) → I/O9 4-20mA
Wiring instructions Ratiometric (Diesel tank)
Green wire (Data) → I/O1 AIN1
Black wire (Voltage) → I/O5 +3.3V OUT
Brown wire (GND) → I/O6 SWGND
MAG8000: Modbus
Wiring instructions
White wire (GND) → I/O3 RS-485 B
Brown wire (Data) → I/O4 RS-485 A
Black wire (GND) → GND
Red wire (Battery/Power supply 12-24 V) → VIN
1-wire
Wiring instructions
Green wire (Voltage) → I/O5
White wire (Data) → I/O 8
Brown wire (GND) → GND
Activating the batteries
Remove the strip to activate the batteries. When the Hawk module is inserted, the LED next to the GPS antenna will flash briefly. If the LED does not blink, the module still needs to be reset. This is done by removing the batteries for at least five minutes to allow any residual charge to drain. Then reinstall the batteries.
Closing the case
Place the lid on the gateway and gently squeeze it shut. The foam in the lid will press against the batteries and hold them firmly in place when the device is turned over. Tighten the 8 screws evenly. During the first assembly, the screws can be quite stiff.
Attention!
Make sure to insert the lid correctly. The foam should be over the batteries. Screwing the cover the wrong way around will damage the gateway.
Installation
The gateway can be mounted to the object to be tracked using screws, bolts, cable ties, or industrial adhesives.
Please note the following when selecting a mounting point:
Reduce the chance of accidentally crushing or detaching the device.
Increase GPS and mobile reception by mounting the gateway in a good spot.
Make sure there is sufficient ventilation.
Attention!
When the gateway is used as a battery-powered device, reception is critical to its performance.
GPS
Every twelve hours, the Hawk module tries to obtain a GPS fix. Sometimes it is not possible to get a fix when the module is attached under an iron cover. The most optimal situation for the Hawk module to obtain the GPS fix on is when it can "see" the outside air. You can try to get the Hawk to get a new fix by resetting it. You can do this by removing the batteries for at least five minutes. Then, when you reinstall the batteries, the Hawk will attempt to obtain a new fix.
Calibrating the tank
After installing the gateway and the sensor in the tank, you should fill the tank completely. To calibrate a tank, first go to the dashboard tank of the tank in question. At the bottom of the dashboard you will find the widget Max Raw Sensor data in Period. When the tank is completely full, use this value to calibrate the tank.
Hint!
The tank monitor sends its data every hour, wait until you are sure that this is the highest value.
At the top of the dashboard, you will see the name of the tank, followed by an arrow icon. Click on this icon to open the Edit asset page and go to the Metadata tab. There you can specify values for different variables.
The most important variables for calibrating a tank are:
Tank litres: enter the maximum volume of your tank in litres, for example 300.
Tank100pct: enter the value you see in the Max Raw Sensor data in Period widget on the dashboard. The value you enter here is the value you obtain when the tank is completely filled. Make sure that you do not write down the comma or the period.
Replacing the batteries
The type of battery is important. When a 4-20mA sensor is connected to the gateway, Lithium Thionyl Chloride (LTC) batteries must be used. Not all LTC batteries are built the same. Preference is given to batteries of the Spiral Type. Bobbin Type batteries may not be able to provide enough peak current. If you want to replace the batteries and open the case, make sure the silicone seal is in good condition before closing the case again.
For more information, read the following article: Digital Matter Eagle battery recommendations