Thermo Fisher Scientific Dioxide Ion Selective Electrodes Carbon - Manual (Page 15)

Instruction Manual Carbon Dioxide Electrode
15
TABLE 4: Step-wise Calibration for Measurement
Step Pipet Added Volume Concentration
1 A
0.1 ml 109.9 ppm
2 A 0.9 ml 1,089 ppm
3 B 10.0 ml 10,900 ppm
A = 1 ml graduated pipet; B = 10 ml volumetric pipet
TROUBLESHOOTING GUIDE
The goal of troubleshooting is the isolation of a problem through checking each of the system
components in turn: the meter, the glassware, the electrodes, the standards, the sample, and the
technique.
Meter
The meter is the easiest component to eliminate as a possible cause of error. Most meters are
provided with an instrument check-out procedure in the instruction manual and a shorting strap for
convenience in troubleshooting. Consult the manual for complete instructions and verify that the
instrument operates as indicated and is stable in all steps.
Glassware
Clean glassware is essential for good measurement. Be sure to wash the glassware well with a mild
detergent and rinse very well with distilled or deionized water. Clean glassware will drain without
leaving water droplets behind.
Electrodes
The electrodes may be checked by using the procedure found in the sections entitled
Electrode
Slope Check.
1. Be sure to use distilled or deionized water when following the procedures given in
Electrode Slope Check.
2.
If the electrode fails to response as expected, see the sections
Measuring Hints
and
Electrode Response
. Repeat the slope check.
3.
If the electrode still does not perform as described, determine whether the carbon dioxide
inner body is working properly as directed in
Checking the Electrode Inner Body
.
4.
If the stability and the slope check out properly, but measurement problems persist, the
standards may be of poor quality, the sample may contain interferences or the technique
may be in error. (See
Standard, Sample
and
Technique
sections below.)
5.
Before replacing a "faulty" electrode, review the instruction manual and be sure to:
- Clean and rinse the electrode thoroughly.
- Prepare the electrode properly.
- Use proper filling solution, buffer, and standards.
- Measure correctly and accurately.
- Review
TROUBLESHOOTING HINTS
.