Each sensor is calibrated in the factory prior to shipment using high-accuracy equipment, to meet the specified accuracy levels. The calibration parameters are stored in the cloud and are used by the platform to display the readings. When working with the Bridge via Modbus TCP, the calibration parameters are stored inside the Bridge.

These sensors do not need to be re-calibrated periodically, due to the following facts:

1. Panoramic’s sensors are not connected directly to the electrical phases.
2. Panoramic’s sensors power up due to current on the electrical phase which creates an Electromagnetic field on the Sensors Current transformer and operates the Sensor.
3. CT Primary and Secondary Windings:
- The CT has a primary winding, which consists of the electrical phase turn (the conductor itself).
- The secondary winding has many turns.
4. Electromagnetic Induction:
- When the current flows through the primary winding, it creates a magnetic field around it. This magnetic field induces a current in the secondary winding through electromagnetic induction.
-The induced current in the secondary winding is proportional to the current in the primary winding but reduced by the turns ratio of the transformer.

Since the Current Transformer does not have any wear and tear, the sensor’s operation conditions stay fixed. The sensor measures the current on a high-power dissipation shunt resistor which is not affected by the allowed current (per DS). As a result, all conditions are fixed as well.

Calibration coefficients set by the production process in the factory define the way the sensor works.