Serinus 51 User manual 1.0
Calibration
37
3. Perform a zero calibration as described in section 4.1
4. Perform a span calibration as described in section 4.2
5. Set up a program for measuring the span concentration through 5 steps down
from 80% of full scale
Example for full scale of 100ppb
a. Set the 1
st
concentration on the gas calibrator to 80ppb, allow
instrument to sample for 15 minutes, record measurement.
b. Set the 2
nd
concentration on the gas calibrator to 60ppb, allow
instrument to sample for 15 minutes, record measurement.
c. Set the 3
rd
concentration on the gas calibrator to 40ppb, allow
instrument to sample for 15 minutes, record measurement.
d. Set the 4
th
concentration on the gas calibrator to 20ppb, allow
instrument to sample for 15 minutes, record measurement.
e. Set the 5
th
point at a concentration of 0ppm (zero air); allow the
instrument to sample for 15 minutes and record measurement.
6. The linearity and correlation can be calculated for each point manually or all
points calculated within excel
7. Manual Calculations
Record the concentration measurement at each point and determine the percent
difference between instrument response and the supplied concentration using
the following equation
DifferencePercent 100
ionConcentrat Supplied
ionConcentrat Supplied - Response Instrument
=×
Equation 1 Instrument accuracy
8. If the difference between values is less than 1% then the instrument is within
specifications. Otherwise a Leak Check and or service are required
9. Microsoft Excel
Alternatively all the data can be placed in an excel spreadsheet in columns
next to the supplied concentration.
10. Create an X Y scatter plot of expected calibration against instrument response,
right click on either point and select “Add Trendline”. Tick the “Display
equation on chart” and “Display R-squared value on chart” in the options tab
11. The linear regression equation y = mx + b will be displayed
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