Fuel pressure sensor for Volvo truck engine 20484678

The online calibration tool for the pressure sensor comprises a calibration pressure sensor, wherein the calibration pressure sensor is arranged in a tool support; a calibration pressure head through hole is formed at the top of the tool support; a calibration pressure head is arranged in the calibration pressure head through hole; the bottom surface of the calibration pressure head is pressed against the top surface of the calibration pressure sensor; and a stepped tool positioning groove is formed at the lower part of the tool support. The calibration pressure head on the upper part of the tool is installed by simple insertion and quick replacement, and the tool base adopts multi-step holes to meet the requirements of different positioning fixtures. A set of calibration tool for calibrating pressure sensors can realize online calibration of different pressure sensors, and the calibration tool has compact appearance structure, high calibration efficiency and simple operation.

1. An oil level sensor, comprising a shell with an open bottom, wherein a guide rod is fixedly arranged inside the shell, a float is slidably fitted on the guide rod, and a main chamber for the float to move is arranged between the guide rod and the shell, characterized in that a channel for communicating the top of the main chamber with the outside is arranged at the top of the shell.

2. An oil level sensor according to claim 1, characterized in that the channel comprises a buffer section, and the projection of the buffer section along its centerline direction is located outside the moving area of the float.

3. An oil level sensor according to claim 2, wherein the channel comprises a main channel section communicating with the main chamber along the moving direction of the float, and the buffer section is located at one end of the main channel section far from the main chamber.

4. An oil level sensor according to claim 3, characterized in that the buffer section is a communication port extending along the radial direction of the main channel section.