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Does anybody have a symptom/fault chart for pneumatic DP cell?
There are still some pneumatic transmitters in production and their manuals are available as .pdf's on the web:
http://new.ametek.com/content-manager/files/USG//MOD-401.pdf http://www.c-a-m.com/content/products/product_detail.cfm?pid=51694
The older pneumatic transmitters might be available as archives from the original source's archives. I found the Moore 50PW3 on Siemen's site:
https://support.automation.siemens.com/US/llisapi.dll?func=cslib.csinfo&lang=en&objid=29322583&caller=view
Each has a page of troubleshooting instructions.