24
C. Gerhardt GmbH & Co. KG
The reaction time is required for the nitrate nitro-
gen determination when using the Devarda alloy
(e.g. determination of fertiliser), but not for the
Kjeldahl analysis.
Example:
0 min 0 s
Range 0 - 99 min and 0- 59 s
Select the distillation time so that approx. 100 ml
is collected. This corresponds to between 3 min
30 s and 4 min with maximum steam power. For
the determination of ammonia in the water ana-
lysis a phosphate buffer is used for the determi-
nation of the ammonia nitrogen instead of NaOH
solution and 200 ml of distillate must be collec-
ted. Switch between min/s with cursor "up" /
"down".
Example:
3 min 30 s
Range 0 - 99 min 59 s
Enter
If the on-line titration mode is used, the pH diffe-
rence to the actual endpoint towards which is ti-
trated during the distillation must be entered. The
difference is then titrated once the distillation is
finished.
The range of the delta pH is between 1 and 13.
Enter
The steam power can be set between 40 % to
100 %. The Kjeldahl analysis works preferably at
maximum power. If the power is reduced, the di-
stillation time has to be increased in order to col-
lect the same volume of distillate. For some de-
terminations, e.g. the ammonia determination, a
specific amount of distillate is required within a
specific time. The steam power can then be ad-
5.
6.
8.
7.
Enter
Enter
Enter
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