GE Analytical Instruments ©2016
114 of 270
DLM 68100-09 EN Rev. A
Chapter 5: Calibration and Verification
The dilution ratios available for use in Auto Dilution are shown by range in
Blank Correction
Use the blank correction feature if you want the Analyzer to automatically calculate the TOC contribution from
the acid, oxidizer, and dilution water used with the Analyzer and exclude TOC contributions from these sources
when calculating calibration values. For additional information, see
“Blank Correction” on page 150
.
Only calibrate the Analyzer with blank correction turned on if your samples contain less than 10 ppm TOC, IC, TC
or NPOC and you also plan to measure your unknown samples with the blank correction feature turned on. If
you run a 'zero' or blank as your first point in a calibration curve, it is not recommended to use the blank
correction feature.
In order to perform a calibration with blank correction on, first calibrate the Analyzer in TOC mode in the
Up to 1,000
ppm
range with blank correction off. Then perform the blank measurement using that calibration.
See
“Measuring the Blank” on page 151
for the procedure.
Calibration Groups
If you are using the Analyzer’s Auto Range function, you will need to specify at least one calibration group. The
calibration group tells the Analyzer which calibration to use in each range. The Analyzer can store up to 20
calibration groups.
To set up a calibration group
1. From the
Menu
screen, select
Cal/Ver
.
2. Select
Calibration Groups
.
3. Press the
New
button.
Table 8: Maximum Dilution Allowed Using Auto Dilution Feature
Range
Maximum
Dilution
Up to 100 ppm
14:1
Up to 1,000 ppm
10:1
Up to 5,000 ppm
4:1
Up to 20,000 ppm
Not available
Up to 50,000 ppm
Not available
N
OTE
:
All Auto Dilution ranges are available to include in a calibration group, with the exception of the
Up to 100 ppm range.
