Water Softener Apparatus Including a Salt Level Indicator Device
The invention relates to a water softener apparatus comprising a housing, said housing having a chamber for accommodating at least one compressed salt block having an elongate block form, the configuration being such that the compressed salt block is accommodated within said chamber with its longitudinal axis in a vertical orientation. The water softener apparatus includes a manually detachable front cover enclosing the chamber and a non-touch salt level indicator device arranged in the in or on said front cover of the housing above the chamber so as to determine a salt level from an upper end face of a compressed salt block accommodated in the chamber, the non-touch salt level indicator device determining the salt level from the upper end face of the compressed salt block through a wall of said front cover of the housing. The non-touch salt level indicator device is a battery powered device and the water softener apparatus is a non-electric powered water softener apparatus.
1 . A water softener apparatus comprising:
a housing, said housing having a chamber for accommodating at least one compressed salt block having an elongate block form comprising vertical walls, a horizontal upper end face and a horizontal lower end face, the chamber adapted to the longitudinal external shape of the compressed salt block for insertion of the compressed salt block longitudinally into the chamber, the configuration being such that the compressed salt block is accommodated within said chamber with its longitudinal axis in a vertical orientation;
a non-touch salt level indicator device comprising a time-of-flight sensor mounted in or on the housing above the chamber so as to determine a salt level in the chamber from the horizontal upper end face of the compressed salt block accommodated in the chamber, the non-touch salt level indicator device determining the salt level by reflecting a signal emitted by the time-of-flight sensor off the horizontal upper end face of the compressed salt block and by measuring a round-trip time of the reflected signal.
2 . The water softener apparatus of claim 1 , wherein the time-of-flight sensor is configured to emit the time-of-flight signal along or parallel to the longitudinal axis of the chamber to reflect off the upper end face of the compressed salt block.
3 . The water softener apparatus of claim 1 , wherein the compressed salt block has an inclined or inwardly curved functional side wall which abuts a surface of the water softener apparatus to maintain a vertical posture of the compressed salt block within the chamber as a lower end of the compressed salt block erodes to form brine.
4 . The water softener apparatus of claim 1 , wherein the time-of-flight sensor comprises an infrared time-of-flight sensor.
5 . The water softener apparatus of claim 1 , wherein the non-touch salt level indicator device comprises a processor and a memory storing machine readable instructions which, when executed by the processor, cause the non-touch salt level indicator device to measure a level of the compressed salt block within the chamber.
6 . The water softener apparatus of claim 5 , wherein the processor of the non-touch salt level indicator device calibrates salt level measurements made by said non-touch salt level indicator device by triggering the non-touch salt level indicator device to take minimum and maximum salt level distance measurements, the minimum salt level distance measurement corresponding to a new salt block being accommodated in the chamber and the maximum salt level distance measurement corresponding to no salt block being accommodated in the chamber, the processor being configured to store said minimum and maximum salt level distance measurements in the memory and to make suitable adjustments to subsequent salt level distance measurements based on calibration data derived from said minimum and maximum salt level distance measurements.
7 . The water softener apparatus of claim 6 , wherein the processor causes the non-touch salt level indicator device to make the maximum salt level distance calibration measurement from a surface of a level of water in the bottom of the chamber.
8 . The water softener apparatus of claim 1 , wherein the non-touch salt level indicator device is a standalone device configured to latch onto, be inserted in or otherwise be supported by a front cover of the housing or the non-touch salt level indicator device housing is freely supported on the housing.
9 . The water softener apparatus of claim 1 , wherein the non-touch salt level indicator device has two time-of-flight sensors for determining respective salt levels from respective upper end faces of two compressed salt blocks supported in respective parts of the chamber or respective chambers.
10 . The water softener apparatus of claim 1 , wherein the non-touch salt level indicator device is battery operated.
11 . A method of measuring a level of salt in a water softener apparatus comprising a housing, said housing having a chamber for accommodating at least one compressed salt block having an elongate block form comprising vertical walls, a horizontal upper end face and a horizontal lower end face, the chamber adapted to the longitudinal external shape of the compressed salt block for insertion of the compressed salt block longitudinally into the chamber, the configuration being such that the compressed salt block is accommodated within said chamber with its longitudinal axis in a vertical orientation; and a non-touch salt level indicator device comprising a time-of-flight sensor, said non-touch salt level indicator device housing mounted in or on said housing above the chamber, the method comprising:
measuring a salt level in the chamber from the horizontal upper end face of the compressed salt by reflecting a signal emitted by the time-of-flight sensor of the non-touch salt level indicator device off the horizontal upper end face of the compressed salt block and determining a round-trip time of the reflected signal.