FLUID LEVEL SENSOR AND RELATED METHODS

摘要

In an embodiment, a fluid level sensor includes a sensor plate and a current source. The fluid level sensor also includes an algorithm to bias the current source such that current applied to the sensor plate induces a maximum difference in response voltage between a dry sensor plate condition and a wet sensor plate condition.

主权项

1. A fluid cartridge comprising:
a nozzle; a fluid channel; a sensor plate on a floor of the channel; a current source coupled to the sensor plate to induce a voltage response across the sensor plate; a sensor circuit to determine the voltage response of the sensor plate to the current source, the voltage response indicating to what extent the sensor plate is in contact with fluid and with air; and an electronic controller to determine a bias for the current source such that the induced voltage response across the sensor plate has a maximum variation between wet and dry sensor plate conditions; wherein the electronic controller is to output a signal indicative of a fluid level based on the voltage response of the sensor plate.