Sample Measurement - Elitech ChloroChek Chloridometer 3400 User Manual

SECTION 3
OPERATING THE CHLOROCHEK

3.7 Sample Measurement

PROCEDURE
NOTE:
Before each sample series, perform quality control procedures (see Section 3.5). ELITech Group normally
recommends testing the 100 mmol/L NaCl/H
the three levels of sweat control should be tested; results should be within the specified values for the sweat
controls. These controls are tested according to the instructions below.
1 Place a correctly-sized pipette tip onto a 10 µL fixed-volume piston pipette.
Place the pipette tip well into the sample, holding the tip in the sample during the entire filling phase.
Avoid drawing air into the pipette during the filling phase. Allow the piston to smoothly and slowly
retract until it has returned to its initial position. Wait for about one second and then remove the pipette
from the solution. If there are drops on the outside of the pipette tip, carefully remove them with a lint
free tissue—do not draw out any solution from the pipette tip (through capillary forces of the paper
tissue)—or repeat the process with a new pipette tip.
2 Using one of the pipette guides found on the sensor carriage, place the loaded pipette tip as near as
possible in the center of the stirring Working Solution. Avoid expressing solution near the electrodes or
the sides of the beaker. Press the piston down to the second pressure point to completely eject the
solution, and then remove the pipette tip with the piston still pressed.
20
O Standard Solution until it consistently reads 100 ± 2 mmol/L. Also,
2