Sper Scientific 860031 pH - mV Bench-Top Meter - Manual (Page 62)

62
APPENDICES
Actual Conductivity: Value measured using a properly cal-
ibrated Conductivity/TDS/Temperature meter.
Both the actual TDS and the actual conductivity values
must be in the same magnitude of units. For example, if
the TDS value is in ppm, the conductivity value must be in
uS; if the TDS value is in ppt, the conductivity value must
be in mS. Check this number by multiplying the
conductivity reading by the factor in the formula and the
result is the TDS in ppm.
APPENDIX C:
TEMPERATURE EFFECT
Conductivity measurements are temperature dependent; if
the temperature increases, conductivity increases. For
example, the conductivity measured in a 0.01 M KCl
solution at 20°C is 1.273 mS/cm, whereas at 25°C, it is
1.409 mS/cm.
The concept of reference temperature (Normalization
temperature) was introduced to allow the comparison of
conductivity results obtained at different temperatures. The
reference temperature is usually 20°C or 25°C. The meter
measures the actual conductivity and temperature, then
converts it to the reference temperature using a
temperature correction function and displays the
conductivity at the reference temperature. It is mandatory
to associate the temperature together with a conductivity
result. If no temperature correction is applied, the
conductivity is the value taken at the measurement
temperature.