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To perform 1-Pt Calibration:
1) Ensure sample is delivered to analyzer at flow rate of 150-400ml/min
2) Place low concentration solution (100ppb) in the container CAL1.
4) Check the high and low solution concentrations need to be entered in the
system under CALIBRATION SETUP. Refer to Section 3.4.5.1.1 for more details.
5) Ensure the Grab Sample bottle is empty or disconnected.
6) Press the “CAL 1 Pt” Button in the Commands Window.
3.4.3.3
Cal 2 Pt
A 2-Point calibration must be performed (and passed) for the instrument to function
correctly. Before initiating a calibration sequence, rinse the two standard solution
containers with high-purity (DI) water and fill them with fresh sodium standard
solutions. This establishes the slope of the calibration curve.
During a 2-Pt calibration the first solenoid valve is energized first and CAL1 solution
flows through the flow cell. Once analyzer finishes measuring the CAL1 solution, the
first solenoid valve is deactivated and the second solenoid is activated thus allowing
CAL2 solution to flow through the flowcell. The analyzer calibrates by measuring the
change in mV values between the CAL1 and CAL2 solutions and comparing this
“strength” (sometimes called “slope”) to theoretical values. NOTE: During two point
calibration sample needs to be delivered to analyzer at flow rate of 150-400ml/min. If
not, calibration will result in CF.
The frequency of calibrations depends on the operating conditions and electrode
conditions. Waltron recommends performing a 2-Point calibration at least once a week
to eliminate drift due to changing electrode response.
Description of 2-Pt Calibration Process:
1.
After CAL is initiated, solenoid valve #3 (Grab Sample) is opened for 2 minutes to
drain any grab sample solution left in bottle.
2.
Solenoid valve #1 (CAL1) is opened for 10 minutes to rinse out system and
update with 100ppb solution.
