3 Technical data
K-375 / K-376 / K-377
Operation Manual, Version E
28
T [°C]
–30…115
0,1
0,5 K ±1 digit
*Accuracy:
Indicated in terms of measuring incertainty with a confidence of 95 %. In addition the measuring
uncertainty of the sensor has to be taken into account as well. For pH electrodes e.g.:
∆
pH=0.012...0.03 according to DIN 19 266, Part 3.
3.3 Determination parameters
The amount of sample and the concentration of the titrant should be optimized, so that the titrant
volume is between 3 and 17 mL (buret volume: 20 mL).
Nitrogen
content
absolute
Nitrogen
content
relative
Protein content
relative (Protein
factor 6 25)
Sample
size
Boric acid
concen-
tration
Titrant
concen-
tration
Titrant
volume
0.02 mg
20 ppm
1.0 g
2 % (+3 g
KCl/L)
0.005 N
2 mL
0.1 mg
100 ppm
1.0 g
2 %
0.005 N
3 mL
1 mg
0.2 %
1 %
0.2 g
2 %
0.01 N
8 mL
5 mg
1 %
6 %
0.5 g
2 %
0.1 N
4 mL
10 mg
1 %
6 %
1.0 g
4 %
0.1 N
8 mL
20 mg
2 %
13 %
1.0 g
4 %
0.1 N
14 mL
50 mg
5 %
31 %
0.4 g
4 %
0.1 N
14 mL
100 mg
10 %
63 %
1.0 g
4 %
0.5 N
14 mL
100 mg
20 %
0.5 g
4 %
0.5 N
14 mL
200 mg
20 %
1.0 g
4 %
0.5 N
28 mL
General recommendation
The correction factor for self prepared solutions is called titer.
The use of standardized titration solutions make a titer determination unnecessary.
Exact titrant concentration = concentration x titer
The titer of the titrant must be known. In case, it is unknown, it must be determined.
Example:
Exact titrant concentration = 0.100 mol/L x 0.998
