Metrohm 765 Dosimat - Manual (Page 62)

5.5. Continuous dosing with two Dosimats
765 Dosimat
58
Example:
Continuous dosing of 55 mL. Exchange units with volumes of 20 mL and 10 mL.
Key:
End volume V = 55 mL
Exchange unit 1 V
1
= 20 mL
Exchange unit 2 V
2
= 10 mL
55
1. N = Int———— = 1
20+10
2. V
R
= 55 - 1*(20+10) = 25
3. 25 (V
R
) is larger than 20 (V
1
), i.e. Dosimat 2 is the final burette.
4. V-LIM for Dosimat 2 is: 55-20*(1+1) = 15
Settings:
Dosimat 1 (start Dosimat) Dosimat 2 (final Dosimat)
20 mL Exchange unit 10 mL Exchange unit
V-DIS = 20 mL V-DIS = 10 mL
V-LIM = OFF V-LIM = 15 mL
rate ↑ = 25.5 mL/min rate ↑ = 25.5 mL/min
rate ↓ = 60 mL/min rate ↓ = 30 mL/min
The rate ↑ of 25.5 mL/min is the highest possible value for the predefined configuration.