Patent ID: 11919009
Assignee: ADEY HOLDINGS (2008) LIMITED
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  C  G | IPC B  C  G

Claim 7:
8. A captured debris level measuring device for a magnetic filter in a central heating system, the captured debris measuring device comprising:
a magnetometer for mounting to the magnetic filter to measure a magnetic field strength due to a magnet and any captured magnetic debris;
a temperature sensor for mounting to the magnetic filter; and
a control unit, the magnetometer and temperature sensor being connected to inputs of the control unit, and output means being provided adapted to issue a notification based on a combination of the magnetometer reading and the temperature sensor reading to provide an indication when the amount of debris captured within the filter exceeds a threshold level, the control unit being adapted to combine a temperature reading from the temperature sensor with a raw magnetic field strength reading from the magnetometer to calculate a corrected magnetic field strength yc, as

yc=(y0−tx)+C 

where y0 is the raw magnetometer reading taken from the magnetometer, t is the temperature measured by the temperature sensor, x is a correction exponent and C is a constant.