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Chapter 5 | Measurements
Chapter 5
Measurements
5.1 Read Types
selected in the meter Setup Menu will
determine how measurements are performed and when
measurements are saved to the data log and exported to
an external device. Set the Read Type as Continuous,
Auto-Read or Timed to define.
5.1.1 Continuous
In the Continuous measure mode, measurements are
continuously updated on the display and the stopwatch
(stabilizing) or checkmark (stable) icon indicates the
measurement stability status.
Press the “Log/Export” key to save a measurement to the
data log and export.
5.1.2 Auto-Read
In the Auto-Read measure mode, press the “Measure” key
to start a measurement.
When the measurement is stable, the checkmark (stable)
icon is shown and the measurement is locked on the
display until the “Measure” key is pressed again.
The stable measurement is automatically saved to the data
log and exported.
5.1.3 Timed
In the Timed measure mode, the measurement values are
continuously updated on the display.
Measurements are automatically saved to the data log and
exported at the selected time intervals, from 5 seconds to
60 minutes, the entire time the meter is in the
measurement mode.
5.2 Conductivity, Salinity
and TDS Measurements
Rinse the electrode with distilled water or
appropriate solution and blot gently with a lint-free
tissue to remove excess water.
Place the electrode into the sample, submerging the
measurement plates and temperature sensor.
Allow time for the reading to stabilize.
a.
The meter displays the stopwatch icon while
the reading is stabilizing.
b.
The meter displays the checkmark icon when
the reading is stable.
Note the displayed measurements as required.
Remove the electrode from the sample.
Repeat steps 1-5 for all samples.
When all samples have been measured, store the
electrode per instructions in the electrode manual.
5.3 Calculating
Temperature Coefficients
To determine the temperature coefficient of your sample
solution, use this formula:
𝑡𝑡𝑡𝑡 = 100 ×
𝐶𝐶
𝑇𝑇2
− 𝐶𝐶
𝑇𝑇1
𝐶𝐶
𝑇𝑇1
(𝑇𝑇
2
− 25) − 𝐶𝐶
𝑇𝑇2
(𝑇𝑇
1
− 25)
Where:
tc = Temperature coefficient
25 = 25ºC
C
T1
= Conductivity at Temperature 1
C
T2
= Conductivity at Temperature 2
T
1
= Temperature 1
T
2
= Temperature 2
Note: A controlled temperature water bath is ideal for this
procedure.
Immerse the conductivity electrode into a sample
solution and adjust the temperature coefficient to
zero (no compensation). Refer to the
Wait for 5 minutes. Record T
1
and C
T1
(conductivity
at T
1
).
Summary of Contents for Eutech EC 1720
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