Samson 3730-2 - Set Point Deviation Histogram

40 EB 8389 EN
Statistical information
4.4 Set point deviation histo-
gram
3730-2 3730-3 3731-3 3730-4 3730-5 3731-5
• • • • • •
The set point deviation histogram contains a
statistical analysis of any set point deviations
recorded. It provides information on to which
extent a set point deviation has occurred
during the valve service life and whether
faults may occur due to a restricted working
range or due to seat leakage.
Data are recorded in the background re-
gardless of the operating mode selected. Da-
ta logging does not need to be activated.
The positioner records the set point deviation
every second and assigns the data into pre-
dened classes. The distribution showing
how often the set point deviation remained
within a class is shown in a bar graph.
− The 'Average value e long' indicates the
average class assignment of the set point
deviation over the 'Observation period.'
− The 'Number of measurement values'
shows the total number of values were
recorded during the 'Observation peri-
od'.
− 'Observation period'
− 'Absolute value of max. set point devia-
tion' (not Type3730-4): The largest set
point deviation measured during the ob-
servation period
− 'Min. set point deviation' (Type3730-4
only): The smallest set point deviation
measured over the observation period.
− 'Max. set point deviation' (Type3730-4
only): The largest set point deviation
measured over the observation period.
The measured data are saved in a non-vola-
tile memory in the positioner every 24 hours.
Fig.4: Diagnosis > Statistical information > Set point deviation histogram e