21
Rad.Disc Config Menu
Radiation Discrimination is used where radiography is frequently used to inspect vessel welds. There are
two types of configurations. The first is using an optional external detector to sense the changes in the
background radiation. This configuration provides the maximum type of protection because it senses small
changes in background. The second option uses the same level detector that is used for the level
measurement. Using this configuration can only provide protection when the background field exceeds the
normal vessel operating field.
The
Rad.Disc Config
menu is used to control the Radiation Discrimination. It contains the following
items:
ITEM
FUNCTION
Mode
Shows the current state of the Radiation Discrimination Mode (Disabled, Internal,
External) and allows the user change the state.
Intern Rad Discr
Selecting this item takes the user to the
Intern Rad Discr
menu
Extern Rad Discr
Selecting this item takes the user to the
Extern Rad Discr
menu
The
Inter Rad Discr
menu is used to configure the internal detector (level detector) as the sensing
detector for radiation discrimination.
ITEM
FUNCTION
Min Fault Cnts
Shows the minimum counts the internal detector must have for normal operation. If
the detector signal fall below this value, the rad disc feature is enabled.
Max Fault Cnts
Shows the maximum counts the internal detector must have for normal operation. If
the detector signal goes above this value, the rad disc feature is enabled.
The
Extern Rad Discr
menu is used to configure the external radiation detector as the sensing
detector for radiation discrimination.
ITEM
FUNCTION
Filt.Constant
Show the amount of time that is used for averaging the background counts.
Low Sigma
Shows the (sigma) multiplier used to determine the threshold that the raw counts must
exceed before the system can go into Radiation Discrimination. Sigma is the square
root of the current filtered counts. This value can be changed by the user.
Low Sigma Cntr
Shows the Low Sigma Cntr value. The Low Sigma Cntr is the number of consecutive
scan the raw counts variations must exceed Low Sigma threshold before the Radiation
Discrimination is enabled.
High Sigma
Shows the (sigma) multiplier used to determine the threshold that the raw counts must
exceed before the system can go into Radiation Discrimination. Sigma is the square
root of the current filtered counts. This value can be changed by the user.
High Sigma Cntr
Shows the High Sigma Cntr value. The High Sigma Cntr is the number of consecutive
scan the raw counts variations must exceed High Sigma threshold before the Radiation
Discrimination is enabled.
Surge Clamp
This is the saturation level counts from the dtector. its value should be down around 5,
assuming your background counts never get that low. If they do, then use a value of 1.