Owner's manual
Table Of Contents
- Content
- Overview
- Operation with the keyboard
- Error messages, troubleshooting
- Diagnosis
- General
- Summary
- Prepare instruments for diagnostic tests
- Diagnosis of cylinder code
- Diagnosis of key board
- Diagnosis of display
- Diagnosis analog output
- Diagnosis of digital timer
- Diagnosis of analog timer
- Diagnosis of external inputs, outputs
- RAM-test
- Diagnosis of spindle zero and cock changeover
- Diagnosis of spindle drive
- RAM-initialisation
- Releasing a locked spindle
- Operation via RS232 Interface
- Appendix
- Index
2.2. Modes
765 Dosimat
14
The formulae for calculation of the volume to be dispensed "add V" are shown in the
following table, with
cnt content in the selected unit
M molar mass of substance to be weighed out
f factor
dens density of the solvent
s weight of substance
Unit Formula for
add V =
Amount-of-substance
concentration
mol/L
mmol/L
f·s·10
3
cnt·M
f·s·10
6
cnt·M
Mass concentration
g/L
mg/L
f·s·10
3
cnt
f·s·10
6
cnt
Mass fraction
%
ppm
f·s(10
2
-cnt)
cnt·dens
f·s(10
6
-cnt)
cnt dens
Molality
mol/kg
mmol/kg
s·10
3
cnt·M·dens
s·10
6
cnt·M·dens
Application of factor f
Factor f for ionic standards
With ionic standards, the mass fraction of a single ion A is usually specified. On the other
hand, the solution is prepared from A
n
B
m
, e.g. a standard of 10 ppm Pb
2+
prepared from
Pb(NO
3
)
2
. The factor f is calculated from the formula:
n*M(A) m*M(B)
f = ———— or f = ————
M(A
n
B
m
) M(A
n
B
m
)
M(A): molar mass of ion A
M(B): molar mass of ion B
M(A
n
B
m
): molar mass of substance A
n
B
m