Hi,
can you try following:
1. find the alert on Alert web page and place the mouse pointer on the value (sensor name) in NETWORK OBJECT column
2. on status bar you should see the link to sensor detail and the NetObject (it's 93 on my screenshot)
3. run query (change ID in WHERE condition to yours). As a result you will get the Category name and Sensor name on "Current Hardware Health" resource
SELECT c.Name,i.ID, i.DisplayName, i.UniqueName,i.OriginalStatus,i.Status
FROM APM_HardwareItem i JOIN APM_HardwareCategoryStatus s ON(i.HardwareCategoryStatusID=s.ID)
JOIN APM_HardwareCategory c ON (s.HardwareCategoryID=c.ID)
WHERE i.ID=93
4. try to find the Sensor name in proper Category on "Current Hardware Health" resource