26
• Measure the sample at a different temperature "t°C" which should
be between 5°C to 10°C different from 25°C and note the
conductivity reading as "Ct".
• The temperature coefficient "ß" of the solution can be calculated
with the following formula:
(Ct - C25)
ß = 100 x ---------------------------
(t°C - 25) x C25
Some solutions, especially in horticulture, use 0.7 as the conversion
rate between conductivity and TDS instead of the common 0.5 CaCO
3
TDS factor.
The TDS factor of
HI 9635
can be selected as 0.7 (F1) or 0.5 (F2).
• Press RANGE to enter TDS1 mode, that is Total Dissolved Solids
with a TDS factor of 0.7 (F0.70 is shown on the secondary
display).
• Press RANGE again to change to TDS2 mode, that is Total
Dissolved Solids with a TDS factor of 0.5 (F0.50 is shown on the
secondary display).
TDS FACTOR (HI 9635
TDS FACTOR (HI 9635
TDS FACTOR (HI 9635
TDS FACTOR (HI 9635
TDS FACTOR (HI 9635 only
only
only
only
only)))))
ppm
TDS
1.95
g m
RANGE
ppm
TDS
1.39
g m
RANGE
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