32
Auto ppt: the meter automatically chooses the range to optimize the measure-
ment, readings will be in ppt only.
1 ppm, 0.001 ppt, 0.01 ppt, 0.1 ppt or 1 ppt: the meter will display the mea-
surement with selected resolution. The default value is Auto.
6.2.11 GPS Format (optional)
Global positioning coordinates have three
standard formats: XX°XX’XX.X’’, XX°XX.XXX’ and
XX.XXXXX°. The selected format will be used in any
screen where the GPS coordinates are displayed.
The default format is XX°XX’XX.X.
6.3 PARAMETER COEFFICIENTS
6.3.1 EC Reference Temperature
This value is used for temperature compensated
conductivity. All EC measurements will be refer-
enced to the conductivity of a sample at this tem-
perature. Press the softkey to select the desired
option; 20 °C or at 25 °C. The default value is
25 °C.
6.3.2 EC Temperature Coefficient
The temperature coefficient Beta (β) is defined by
the following equation (using 25 °C as an ex-
ample):
EC
25
=EC
x
/(1+β(T
x
-25))
Beta is a function of the solution being measured.
For freshwater samples Beta is approximately
1.90%/°C. If the actual temperature coefficient of your sample is known, press
<Modify> to enter the value. To confirm press <Accept>. The value can be
within 0.00 and 6.00%/°C. The default value is 1.90%/°C.
6.3.3 TDS Factor
TDS stands for total dissolved solids, and it is a
calculated value based on the conductivity of the
solution (TDS = factor x EC
25
). The TDS conver-
sion factor can be set from 0.00 to 1.00. A typi-
cal TDS factor for strong ionic solutions is 0.5,
while for weak ionic solutions (e.g. fertilizers) is 0.7.
Press <Modify> to enter the value, press <Ac-
cept> to confirm. The default value is 0.50.
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