The invention relates to a device for continuously measuring a level of an ink in a tank (10) of a continuous ink-jet (CIJ) printer, including: 
- a first pair of electrodes (24, 26) and means for connecting this pair of electrodes in series, for measuring the impedance of a first predetermined height of the ink, in said tank, 
- a second pair of electrodes (16, 18) and means for connecting this second pair of electrodes in series, for measuring a second height of the ink in said tank, this second height being included between this first height and a maximum level; 
- means for calculating said second height, from the resistive components of the 2 impedances measured, independently of the ink conductivity.

Device for measuring a level in a tank

A two-wire system for monitoring fluid level and temperature including a pair of electrical interconnect wires bridged by a fluid level switch and a thermal sensing element. One of the fluid level switch or the thermal sensing element bypasses the other during a trigger event.

Two-wire temperature and fluid level limit switch

An ink quality system for an inkjet printer includes an ink reservoir including a volume of ink. A first sensor is disposed in the ink reservoir. At least a portion of the first sensor is in contact with the volume of ink. A second sensor is disposed in the ink reservoir. At least a portion of the second sensor is in contact with the volume of ink. Electronic circuitry is in electrical communication with the first sensor and the second sensor and configured to measure a quality of the ink by measuring the resistance between the first sensor and the second sensor.

Ink quality sensor and a condition monitoring system for an inkjet printer

The apparatus has sensor (10) which is provided with shielding electrode (26) and measuring electrodes (20,22,24). The electrodes are electrically insulated from the liquid developer by insulating materials formed of polyimide. The shield electrode is provided for shielding measuring electrodes. The alternating voltage is applied with respect to measuring electrodes for determining the alternating current conductivity such that evaluation circuit is provided for evaluating conductivity of liquid developer from alternating current conductivity of measuring electrodes.

Apparatus for determining conductivity of liquid developer in printing system, has evaluation circuit which evaluates conductivity of liquid developer from the alternating current conductivity of measuring electrodes

The invention discloses a liquid drop supply failure detecting device and method and a computing device. The automation of liquid crop supply failure detection is achieved in an ink-jet printing technology, the detecting speed and detecting precision of the liquid drop supply failure detection are improved, and the reliability of a liquid drop supply device is improved. The liquid drop supply failure detecting device comprises a liquid drop receiving structure and a liquid drop measuring device, wherein the liquid drop receiving structure is used for bearing liquid drops, and the liquid drop measuring device is used for determining the resistance value of the liquid drop receiving structure bearing liquid drops.

Liquid drop supply failure detecting device and method and computing device

A sensor includes a first set of electrodes, a second set of electrodes, and at least one electrical circuit. The first set of electrodes is completely submergible in a fluid. The second set of electrodes is partially submergible in the fluid. The at least one electrical circuit is configured to measure resistance of the fluid between the first set of electrodes and configured to measure resistance of the fluid between the second set of electrodes.

Fluid level and concentration sensor

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Fluid level and concentration sensor