Abstract: A control device is provided configured to provide user control signals. The control device comprises a magnetic flux sensing unit configured to provide two-dimensional angular orientation information with respect to a magnetic field acting on the magnetic flux sensing unit, and the user control signals are dependent on the two-dimensional angular orientation information. The control device further comprises a magnet arrangement comprising at least two permanent magnets configured to generate the magnetic field. The magnet arrangement and the magnetic flux sensing unit are arranged to be reoriented relative to one another within a predetermined range of movement, and the at least two permanent magnets are arranged relative to the magnetic flux sensing unit such that the magnetic field experienced by the magnetic flux sensing unit is substantially uniform throughout the predetermined range of movement.

Abstract: A control module for an electrically powered wheelchair is configured to generate control signals for the electrically powered wheelchair in response to user input. The control module comprises: a base portion; a joystick configured to generate the control signals corresponding to user movement of the joystick relative to the base portion; and a pivotable screen mount configured to provide a mount on the base portion for a display screen on which information relating to operation of the electrically powered wheelchair can be displayed to a user.

Abstract: A control device is provided configured to provide user control signals. The control device comprises a magnetic flux sensing unit configured to provide two-dimensional angular orientation information with respect to a magnetic field acting on the magnetic flux sensing unit, and the user control signals are dependent on the two-dimensional angular orientation information. The control device further comprises a magnet arrangement comprising at least two permanent magnets configured to generate the magnetic field. The magnet arrangement and the magnetic flux sensing unit are arranged to be reoriented relative to one another within a predetermined range of movement, and the at least two permanent magnets are arranged relative to the magnetic flux sensing unit such that the magnetic field experienced by the magnetic flux sensing unit is substantially uniform throughout the predetermined range of movement.

Abstract: The present invention provides a method of calibrating sensors within a gas detector (36) having a housing containing a gas inlet whereby gas can diffuse from the inlet to the sensors. The gas inlet in the housing is held against part (34) of the calibration apparatus to form a sealed gas interface between the apparatus and the detector; a source (10) of pressurized calibration gas is connected to the apparatus, and a predetermined dose of calibration gas is delivered to the interface between the detector (36) and the calibration apparatus (34) at a predetermined pressure. The source (10) of pressurized calibration gas may contain single or multiple calibration doses and, if the former, the calibration apparatus includes a dosing system such as cylinder (14) for metering individual doses of calibration gas.

Abstract: The present invention provides a method of calibrating sensors within a gas detector (36) having a housing containing a gas inlet whereby gas can diffuse from the inlet to the sensors. The gas inlet in the housing is held against part (34) of the calibration apparatus to form a sealed gas interface between the apparatus and the detector; a source (10) of pressurised calibration gas is connected to the apparatus, and a predetermined dose of calibration gas is delivered to the interface between the detector (36) and the calibration apparatus (34) at a predetermined pressure. The source (10) of pressurised calibration gas may contain single or multiple calibration doses and, if the former, the calibration apparatus includes a dosing system such as cylinder (14) for metering individual doses of calibration gas.