Metrohm 799 GPT Titrino - Manual (Page 64)

2.6. Parameters, key
799 GPT Titrino
60
Filling times
Refilling times are not incorporated by the Titrino in the calculation of the rate. The filling
times can be calculated using the following formula:
filling rate (in s) s 3 s 20
rate . fill . curr
rate . fill . max
+ ∗ =
The max. filling rate depends on the Exchange unit installed, see page 56. The filling
times (incl. stopcock rotation) can be estimated with the aid of the following table and
taken into account in your dosing routine:
Exchange
Unit
Filling rate
"max."
Filling rate
"100 mL/min"
Filling rate
"50 mL/min"
Filling rate
"10 mL/min"
5 mL 23 s --- --- 33 s
10 mL 23 s --- --- 63 s
20 mL 23 s --- 27 s 123 s
50 mL 23 s 33 s 63 s 303 s
Example:
Dispensing of 1 L reagent is required over a period of 1 hour with a 50 mL Exchange unit.
Calculate the rate to be set.
Dispensing time (disp.time)= 60 min.
Dispensed volume (disp.vol.)= 1000 mL
Filling time (fill.time)= 23 s (filling rate = max.)
Volume of the Exchange Unit = V(B) = 50 mL
Number of refills (refills)= Dispensed volume/V(B) = 1000/50 = 20
If this division does not result in a remainder, the last filling is no longer a "refilling" and
must be deducted. In our example, 19 refills are required. During this time, dispensing is
not performed, i.e. the actual dispensing time is 3600 s - 19 * 23 s = 3163 s =
52.717 min.
The dispensing rate is thus given by 1000 mL/52.717 min = 18.972 mL/min
Summary in a formula:
Dispensing rate 972 . 18
60 / 1 23 19 60
1000
60 / 1 time . fill refills time . disp
. vol . disp
=
∗ ∗ −
=
∗ ∗ −
=