Hach 1950Plus Instrument Manual page 101

The span value is not necessarily
the full scale span, but is the value
of the span calibration standard.
The displayed values (in ppm and
mg/L) may not match your analyzer.
UVTOCOperation.fm
2. Press ENTER to progress to the prompt screen to ensure the standard is
connected to the calibration port.
A pp ly ST D t o
c al ib r at io n p o rt
3. Press ENTER. The screen shows the apparent TOC using the prior
calibration, the pre span countdown timer, and the prior span TOC mg/L.
9 50 m g /l
L as t
Press UP to display the equivalent screen displaying ppm CO
mg/L TOC.
4. After the pre span countdown is completed, the analyzer displays the
TOC mg/L reading and prompts to press ENTER when stable.
For an accurate calibration, high range analyzers benefit from
long exposure to the span standard. The stability is tested before
determining the result, however, the user is responsible for determining
when the reading is stable. During this period, press ENTER to progress
to the next screen.
1 00 0 m g/ l
L as t
5. Press ENTER to store the result of the calibration in the analyzer
data base. A comparison screen between the live ppm and the span
ppm results.
At this point the manual calibration is made the active calibration, i.e.,
Cal to use is set to Manual.
L iv e
S pa n
6. Press ENTER to produce a final screen that displays the comparison of
the calibration set with the primary calibration data set.
1 00 0 m g/ l
1 01 .5 % P ri m .
126s
1 0 00 mg / l
STAB
1 0 00 mg / l
9 50 3 p p m
9 50 1 p p m
Section 6
instead of
2
Page 101
Calibration Menu