Endress+Hauser Gammapilot FMG50 - Page 57

Gammapilot FMG50 Commissioning
Endress+Hauser 57
Normalized pulse rate
Note that the normalized pulse rate is entered in the linearization table. The normalized
pulse rate is not identical to the pulse rate actually measured. The correlation between
these two variables is defined by:
I
N
= (I - I
0
) / (I
MAX
- I
0
) x 1000
Where:
• I
0
is the minimum pulse rate (i.e. the pulse rate for full calibration)
• I
MAX
is the maximum pulse rate (i.e. the pulse rate for empty calibration)
• I: the measured pulse rate
• I
N
: the normalized pulse rate
The normalized pulse rate is used because it does not depend on the activity of the
radiation source used:
• For L = 0 % (empty vessel), I
N
always = 1000
• For L = 100 % (full vessel) I
N
always = 0
The individual linearization values can be entered via the input screen or via a separate
linearization module. The linearization table consists of up to 32 "normalized pulse rate :
level" value pairs.
Linearization table conditions
• The table can consist of up to 32 "level - linearized value" pairs.
• The table must decrease monotonically
• The first value in the table must correspond to the minimum level
• The last value in the table must correspond to the maximum level
The table values can be sorted as monotonically decreasing using the "Table mode -> Sort
table" function.
Edit table: the index of the linearization point is entered in this field (1-32 points)
Customer input value: enter the normalized pulse rate
Customer value: level in unit of length, volume unit or %.
The customer input value in normalized pulse rates and the customer value as a
percentage can be determined in the "Applicator" user software.
3)
Activate table: the "Enable" option must first be selected before the linearization table is
used. The linearization table is not used as long as "Disable" is selected.
The linearization table can also be entered manually in the linearization module. This is
started by selecting the "Linearization" button:
3) The Endress+Hauser Applicator is available online at www.endress.com