Installing gauges onto our V100 or V200 will tremendously help in dealing with any sort of troubleshooting during the life span of the positioner. The importance of the gauge on the “I” Port, by using a 0-30psi gauge, you can trouble shoot most problems with the V100 and V200 series positioners in just a few minutes. When a control signal is applied to the I/P (either an internal I/P or a remote mount I/P) the gauge should read 3psi at 4mA, and 15psi at 20mA if the gauge doesn’t read these pressures (or close to them) then it is likely that your I/P needs to be replaced. If the gauge reads correctly at these signals, then it is most likely that the problem is with the pilot valve. Inspect and clean, or replace the pilot valve. Contact us for more information on troubleshooting.