9-5
METHODS OPTIMIZATION
excess iodine will result in a steep drop in electrode potential which will be interpreted by the
HI 903
as an approaching endpoint. This will in turn result in the dynamic dosing algorithm
reducing the dose size until the excess iodine has time to react. The reduced dose size
effectively interrupts the titration and adds considerable time to the titration duration. The
titration will be interrupted repeatedly in this way such that the overall titration time is
longer, even though the value of the maximum dose size is set to a large volume. The
resulting titration curve will show:
Because reaction rates are faster with two-component reagents than those observed with
one-component reagents the maximum dose volume can be set slightly higher when using
two-component systems. In the case where the maximum dose is too low, titration time will
be extended.
9.1.1.3 Timed Increment
This setting controls the amount of time between successive titrant doses.
Setting the time increment appropriately is important to ensure that the titrant has adequate
time to mix with the sample such that the electrode measures a homogeneous solution
before the titrator makes the decision on the size of the next dose of titrant.
The value of the timed increment is dependent on the type of reagent system being used.
While the default value of 1 second is compatible for use with any reagent system, titrations
using two-component reagent systems can be expedited by decreasing the time between
successive doses.
m
e
t
s
y
S
t
n
e
g
a
e
R
r
e
h
c
s
i
F
l
r
a
K
e
m
u
l
o
V
e
s
o
D
m
u
m
i
x
a
M
s
m
e
t
s
y
S
t
n
e
n
o
p
m
o
C
-
e
n
O
0
3
o
t
0
2
µ
L
s
e
n
o
t
e
k
d
n
a
s
e
d
y
h
e
d
l
a
r
o
f
s
m
e
t
s
y
S
t
n
e
n
o
p
m
o
C
-
e
n
O
5
2
o
t
0
2
µ
L
e
n
i
d
i
r
y
p
h
t
i
w
d
e
t
a
l
u
m
r
o
f
s
m
e
t
s
y
S
t
n
e
n
o
p
m
o
C
-
e
n
O
0
2
o
t
5
1
µ
L
s
m
e
t
s
y
S
t
n
e
n
o
p
m
o
C
-
o
w
T
0
6
o
t
0
4
µ
L
e
n
i
d
i
r
y
p
h
t
i
w
d
e
t
a
l
u
m
r
o
f
s
m
e
t
s
y
S
t
n
e
n
o
p
m
o
C
-
o
w
T
0
3
o
t
5
2
µ
L
Summary of Contents for HI 903
Page 1: ...1 QUICK START GUIDE HI 903 KARL FISCHER VOLUMETRIC TITRATOR Revision 1 0 ...
Page 4: ...4 QUICK START GUIDE ...
Page 7: ...7 QUICK START GUIDE TITRATOR CONNECTIONS Front View Rear View ...
Page 18: ...18 QUICK START GUIDE QS 903 02 11 ...
Page 19: ...1 INSTRUCTION MANUAL HI 903 KARL FISCHER VOLUMETRIC TITRATOR Revision 1 00 ...
Page 22: ......
Page 24: ...1 2 INTRODUCTION ...
Page 26: ...2 2 SETUP ...
Page 30: ...2 6 SETUP 2 3 2 Titrator Rear View 2 3 3 Titrator Left side View ...
Page 40: ...2 16 SETUP ...
Page 42: ...3 2 USER INTERFACE ...
Page 50: ......
Page 52: ...4 2 GENERAL OPTIONS ...
Page 64: ......
Page 92: ......
Page 94: ...6 2 TITRA TITRA TITRA TITRA TITRATION TION TION TION TION ...
Page 106: ...6 14 TITRA TITRA TITRA TITRA TITRATION TION TION TION TION ...
Page 118: ...8 2 MAINTENANCE PERIPHERALS ...
Page 147: ...A1 1 APPENDIX 1 Appendix 1 Contents A1 TECHNICAL SPECIFICATIONS A1 3 ...
Page 148: ...A1 2 APPENDIX 1 ...
Page 152: ......
Page 155: ...A3 1 APPENDIX 3 Appendix 3 Accesories A3 TITRATOR COMPONENTS A3 3 ...
Page 156: ......
Page 159: ...1 GENERAL APPLICATIONS BROCHURE HI 903 KARL FISCHER VOLUMETRIC TITRATOR Revision 1 00 ...
Page 160: ......
Page 161: ......
Page 163: ......
Page 165: ......
Page 167: ......
Page 169: ......
Page 171: ......
Page 173: ......
Page 174: ......
Page 175: ......
Page 177: ......
Page 179: ......
Page 181: ......
Page 183: ......
Page 185: ......
Page 187: ......
Page 189: ......
Page 192: ...2 TITRATION THEORY ...
Page 194: ...4 TITRATION THEORY ...
Page 206: ...16 TITRATION THEORY A B Figure 8 Potential glass electrode mV C ...
