ANATEL A643, Operator'S Manual, Page: 93 / 222

Anatel A643a - Calibration and Validation 93 of 220
RP
S -
J
u
ne
20
07
- E
d
it
io
n 1
2
Anatel
Operator Manual
10) Remove the resistor at the prompt. Also replace the shroud, tighten the screws
fingertight to secure it and replace the protective plug. Specify the value of the
conductivity standard found on the
Certificate of Analysis and press Enter .
CAUTION:
Some instrument surfaces may be hot if the sample water is hot. Allow surfaces to cool before
touching.
11) Remove the sample vessel, insert the conductivity standard vial and press Enter .
CAUTION:
Use extreme care when installing and removing the sample vessel and vials. Contact with the
exposed needle could cause serious injury.
12) Three replicates are run and the results are reported in µS/cm . The results are
displayed once all analyses have been completed. The instrument passes the
conductivity test if the deviation between the actual value of the solution and the
measured result is less than ±5% from the previous calibration or ±10% from the
factory calibration.
Note:
USP Method <645> requires the cell constant be known to within ±2%. To ensure this is the
case, the cell constant is adjusted to the value of the conductivity standard and, therefore, is
always within ±2%. If the measured values are greater than ±10% of the original factory value,
or ±5% of the previous calibration, an alarm message is displayed.
Remove resistor
Enter value of
cond standard
std=XXX.X uS
Fig 6-21 : Remove Resistor