Hach Polymetron 8810 pH Manuel D'utilisation De Base page 23

to that of the application. The buffer 1 solution should have the lowest pH value and buffer 2 the
highest.
1. From the CALIBRATION menu, select ELECTRODE CAL with the scrolling keys and press
Enter.
Option
2 POINT
FILL BUFFER 1
BUFFER 1: XXXXX
FILL BUFFER 2
BUFFER 2: XXXXX
Calibration results
In PRIMARY CAL the calibration is always considered correct and will be used as a reference for the
other calibrations. The slope is considered as 100%.
For other calibrations the new slopes are compared to the values of the primary calibration. If the
new slope values are within 70-130% of the current values they will be considered valid and used for
all future measurement calculations.
If the new slope values are between 50-70% or 130-150% of the current values it is necessary to
CONFIRM the new values. Select YES or NO and press Enter. If YES is selected the new values are
used for all future measurement calculations. If NO is selected (or if the new slope values are <50%
or >150% of the current values) the message ERROR CALIB is displayed. Press Enter to continue.
CAL ERROR indicates that the calibration is in error. Select RETRY to repeat the calibration or
ABORT to abort the calibration.
In automatic calibration the instrument does not require any confirmation. However, if the slope
deviation is <50% or >150% of the current values a warning message SLOPE CALIB ! appears on
the display.
Analog outputs (ANALOG-OUT option)
The analyzer has two analog outputs which are allocated according to the application:
Application
ACID
BASE
FREE/TOTAL ACID
FREE/TOTAL BASE
2p-m
x(p-m)
x(m-p)
1. Select ANALOG-OUT with the scrolling keys and press Enter.
Option Description
START I1/2 Enter the value that corresponds to the 0/4mA current output.
END I1/2 Enter the value that corresponds to the 20mA current output.
Conc Test the output by sending the current corresponding to the last measured value.
Description
Press Enter to confirm a 2-point calibration.
Fill the measurement chamber with the first buffer solution and press Enter.
Enter the pH value of the first buffer solution and press Enter.
Fill the measurement chamber with the second buffer solution and press Enter.
Enter the pH value of the second buffer solution and press Enter.
Analog Output 1
Acid concentration
Base concentration
FREE
FREE
p
m
p
Analog Output 2
pH when starting a titration
pH when starting a titration
TOTAL
TOTAL
2p-m
x(p-m)
x(m-p)
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