A fluid reservoir (100) includes a circuit (105) extending in the fluid reservoir to be at least partially in contact with fluid (120) inside the fluid reservoir during use, at least a first impedance sensor (110) and second impedance sensor (115) coupled to the circuit, wherein the at least first and second impedance sensors are to output impedance values indicative of a degree of particle separation in the fluid.

A liquid ejecting apparatus includes: an ejecting portion configured to be able to eject a liquid onto a medium; a supply flow path configured to be able to supply the liquid to the ejecting portion; a liquid storage unit coupled to the supply flow path and configured to be able to store the liquid, the liquid storage unit being a unit in which an air-liquid interface where the liquid and air are in contact is formed; a first filter provided lower than the air-liquid interface and configured to separate the supply flow path and the liquid storage unit; an adjustment mechanism configured to lift a position of the air-liquid interface in the liquid storage unit; and a control unit configured to control the adjustment mechanism.

A logic circuitry package for a replaceable print apparatus component comprises an interface to communicate with a print apparatus logic circuit, and at least one logic circuit. The logic circuit may be configured to identify, from a command stream received from the print apparatus, parameters including a class parameter, and/or identify, from the command stream, a read request, and output, via the interface, a count value in response to a read request, the count value based on identified received parameters.

A liquid container for accommodating a liquid includes: a plurality of detection electrodes mounted on the liquid container and connected to a detection circuit installed outside the liquid container, wherein the plurality of detection electrodes detects a tilt of the liquid container.

A printing material container is detachably attachable to a printing apparatus having a plurality of apparatus-side terminals. The printing material container comprises a first device, a second device, and a terminal group that includes a plurality of first terminals, at least one second terminal and at least one third terminal. The plurality of first terminals are connected to the first device and respectively include a first contact portion for contacting a corresponding terminal among the plurality of apparatus-side terminals. The at least one second terminal is connected to the second device and includes a second contact portion for contacting a corresponding terminal among the plurality of apparatus-side terminals. The at least one third terminal is for the detection of shorting between the at least one second terminal and the at least one third terminal and includes a third contact portion for contacting a corresponding terminal among the plurality of apparatus-side terminals. The at least one second contact portion, the plurality of the first contact portions, and the at least one third contact portion are arranged so as to form one or multiple rows. The at least one second contact portion is arranged at an end of one row among the one or multiple rows.

A fluid sensor has a first electrode, a second electrode, a housing containing the first and second electrodes, such that the electrodes extend from the housing, exposed metal between the first and second electrodes, and a drive signal electrically connected to the second electrode, such that when fluid is present in the reservoir, either the first electrode senses the presence of the fluid, or the drive signal senses presence of the fluid. A fluid sensor has a first electrode, a second electrode, a housing containing the first and second electrodes, a drive signal electrically connected to the second electrode, and sensing circuitry to measure a current from the second electrode to indicate a fluid level.

A fluidic die includes fluid chambers, each including an electrode exposed to an interior of the fluid chamber and each having a corresponding fluid actuator operating at a high voltage. The fluidic die further includes monitoring circuitry, operating at a low voltage relative to the fluid actuator, to monitor a condition of each fluid chamber, for each chamber the monitoring circuitry including a connection structure and a select transistor and a pulldown transistor connected to the electrode via the connection structure. The connection structure and select and pulldown transistors together structured to form electrically conductive paths with electrical resistances to protect at least the select transistor from fault damage if the high voltage fluid actuator short-circuits to the electrode.

An arrangement for supplying ink to a print bar with small pressure fluctuations may include an ink reservoir and a damping vessel. The print bar may include at least two print heads and is connected with the ink reservoir via a supply line. Each of the print heads is connected with the damping vessel via at least one damping line. The damping vessel is connected with a discharge line. The end of the damping line ends at a first height in the damping vessel. The end of the discharge line ends at a second height above the first height in the damping vessel. The arrangement may supply ink to the print bar with small gas fraction in the ink.

A print material level sensor has a series of print material level sensing devices disposed at intervals to detect presence of a print material at successive depth zones in a container. Each print material level sensing device includes a heater to emit heat at its depth zone and a sensor to sense heat at the depth zone and to output a signal based on the heat sensed. The sensor has control circuitry to enable supply of electrical power to a heater of a first print material level sensing device in a first depth zone and to receive the signal from the sensor of the first print material level sensing device, the control circuitry including a comparator to compare a value of the signal to a target value, wherein the control circuitry stops enabling supply of the electrical power to the heater when the value of the signal is at least equal to the target value.

A print material level sensor has a power node to receive electrical power and a series of print material level sensing devices to receive electrical power from the power node. The print material level sensing devices are disposed at intervals to detect presence of a print material at successive depth zones in a container, wherein each print material level sensing device includes a heater to emit heat at its depth zone and a sensor to sense heat at the depth zone. The sensor has control circuitry to turn on the heater of a first print material level sensing device at a first depth zone for a first time duration during the sensing of the first depth zone and to turn on the heater of a second print material level sensing device at a second depth zone, further from the power node than the first depth zone, for a second time duration longer than the first time duration during the sensing of the second depth zone.