Hach 1950Plus, Инструкция по эксплуатации инструмента, Страница: 102 / 188

Page 102
Calibration Menu
UVTOCOperation.fm
Section 6
6.10.5 Primary Zero/Primary Span Calibration
Perform a primary zero and primary span calibration only when the pump
tubing and/or lamp has been replaced. This allows progressive degradation of
the tubes and lamps to be monitored.
A primary zero and primary span calibration follows a similar sequence of
menu prompted operations as were displayed during manual zero and manual
span calibration, see
section 6.10.3 and section 6.10.4 .
The difference between the two calibrations (Manual zero/Manual span
and Primary zero/Primary span) is that the calibration set obtained during
Primary zero/Primary span calibration is copied into two locations, while
Manual zero/Manual span calibration set is copied into only one location.
Immediately following a primary zero or primary span calibration, the primary
calibration is made the active calibration, i.e., Manual Control/Active Cal is set
to Primary.
6.10.6 Autocal Standard Screen
The displayed value in this example is the concentration of the
standard that will be supplied to the calibration port and used during an
auto calibration and auto validation.
Change the concentration value on the screen as follows:
1. Press ENTER.
2. Flashing asterisks will appear on either side of the displayed value.
Use the UP or DOWN buttons to change the value.
3. Press ENTER when the desired value is displayed to enter the value
in memory.
6.10.7 Multi-point Calibrations
This is an advanced user option
allowing analyzer response
linearization to be performed.
It is not necessary to use this option
in the majority of applications.
These are operator supervised calibrations using between 2 and 10 non-zero
TOC standards. The Multi-point add, Multi-point delete, Multi-point update,
and Multi-point zero operations are used to perform the Multi-point calibration.
There is only one set of multi-point calibration data. The way the calibration
data is used during an online measurement is different for each of the options
selected in the Manual control/Active cal selection screen.
The multi-point calibration data set consists of a zero point (0,y
1
) and up to ten
non zero mg/L calibration span points, (x
2
,y
2
), (x
3
,y
3
)......... (x
11
,y
11
).
Menu entries are provided to add points, delete points, update points. The
initial default entries in the multi-point calibration set are 0%, 10%, 25%, 50%
and 100% of the full scale of the analyzer. For example for the 1000 mg/L unit
the points are (0,y
1
), (100,y
2
), (250,y
3
), (500,y
4
), (1000,y
5
). The y
n
gas CO
2
values are by default automatically chosen to define a perfectly linear graph.
If a multi-point calibration set is selected as the active calibration, either
manually or by performing any multi-point calibration, the Pri v Cal screen will
A u t o c a l S T D
1 0 0 0 m g / l