Disclaimer: This post was originally posted by Hero Member, mjb8743. This user is located in Zone 7, South NJ, Garden State. This was originally posted on September 3, 2013.
The sensor can and should be cleaned periodically. Mineral deposits collect and impede the fragile functioning of the diaphragm.
You can take the sensor apart and clean all components by soaking in white vinegar, then a gentle brushing with a toothbrush. The orifice can be cleaned by inserting and rotating a small piece of wire while submerged in the vinegar. This is a good opportunity to examine the housing for any hairline cracks. A good magnifying glass would be handy here. A good rinsing should finish up.
Now the cautions:
--When disassembling, make a note of the placement/orientation of all components, especially the diaphragm.
--When reassembling, replace the diaphragm in the same orientation it was in originally.
--Insert the 3 screws sequentially, gradually tightening each in sequence. Do NOT fully tighten one, then the next, etc. Do not over-tighten or risk cracking the plastic housing.
Servicing the sensor is a doable project... one for those boring winter evenings when dreams of gardening haunt us.
Mickie