Delta OHM HD 8706-R1, Instruction Manual

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ENGLISH
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3.2 VARIATION OF THE REFERENCE TEMPERATURE
IN CONDUCTIVITY MEASUREMENTS
In conductivity measurements it is possible to change the reference tem-
perature, choosing between the values of 20°C and 25°C.
When the instrument leaves the factory it is set to operate with reference
temperature 20°C; to change to 25°C, proceed as follows:
Holding down the button, press the button until the value 20°C
appears on the display, then release the button; with every impulse
of the button the set value will alternate between 20°C and 25°C and
so on.
To confirm the desired reference temperature, press the button.
The selected value will remain stored in the memory until it is intentionally
changed.
NOTE: when the battery is changed the reference value must be set
at the desired temperature (20°C or 25°C).
3.3 MANUAL CALIBRATION
Manual calibration is possible using solutions with any conductivity. How-
ever it is necessary to know the conductivity of the solution at the tempera-
ture at which calibration is to be carried out. Follow these instructions:
a) Immerse the conductimetry cell in the solution with known conductivity
so that the four electrodes are covered with liquid. Switch off the instru-
ment by pressing the ON/OFF key.
b) Press the α
T
key. The temperature coefficient used for calculating the
temperature compensation in conductivity measurements is displayed.
Using the
t
key, bring the value displayed to 0.00. In this way the tem-
perature compensation in conductivity measurement is excluded.
c) Take the temperature reading by pressing the °C/°F, on the basis of the
temperature determine the conductivity of the calibration solution, for
example by looking it up in a table that indicates conductivity as a func-
tion of temperature.
d) Press the key. Press the CAL key. The µS (or mS) symbol flashes. If
the conductivity of the calibration solution is close to that used in auto-
matic calibration, the instrument proposes this value. Using the
s
and