BERTHOLD TECHNOLOGIES LB 480 - Page 419

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
3 – 419
Volume 3 7 Explanations
3
3. Table with value pairs before adjustment.
Fig. 7-10 Calibration curve
All count rates for each calibration point are adjusted automatically
using the following formula.
cps
new
=
(cps
old
- Bq) * (cps 0%
new
- Bg) / (cps 0%
old
- Bg) + Bg
cps
new
: new calculated count rate
cps 0%
new
: new count rate at 0%
cps 0%
old
: old count rate at 0%
cps
old
: old count rate
Bg
: Background
Example from the table at 70% cps 0%
new
: 5000cps
cps 0%
old
: 7000cps
cps
old
(70%): 3000cps
Bg: 100cps
cps
new
= (3000-100) * (5000-100)/(7000-100) + 100 = 2159cps
Level in % Count rate in cps
0 5000
40 3580
70 2159
100 171
CPS
Level
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