| 摘要 |
Problem: To provide a contamination level determination system for hydraulic oil, which even with light-blocking sensors of simple construction and low price, can improve the sensing accuracy of a contamination level of hydraulic oil contaminated with foreign matter of particle sizes that may cause an operation failure of a hydraulic working machine. Solution: A contamination level determination system for hydraulic oil is provided with a pilot filter 12 arranged in a line of a hydraulic circuit of a hydraulic working machine to remove, from the hydraulic oil, foreign matter of particle sizes that may cause an operation failure of the hydraulic working machine, a first light-blocking sensor 21 for sensing passage of foreign matter on an upstream side of the pilot filter 12, and a second light-blocking sensor 22 for sensing passage of foreign matter on a downstream side of the pilot filter 12. An onboard controller unit 23 functions as a means for determining a frequency of sensing of foreign matter by the first light-blocking sensor 21, a means for determining a frequency of sensing of foreign matter by the second light-blocking sensor 22, and a means for determining a contamination level on the upstream side of the pilot filter 12 on the basis of results of determination by both of these means. |
