Delta OHM HD2106.1, Manual

Page: 17 / 44

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17
To point this condition out, the °C or °F symbol blinks intermittently near the temperature value.
On the main display an "
m " ( m anual) is turned on near the battery symbol (if on). The MT indica-
tion is printed on the print-outs. On the other hand, if the temperature probe is present, the AT sym-
bol appears.
To manually change the compensation temperature press the °C/°F key once: the indicated tempera-
ture value starts blinking. Select the desired temperature value
by using the arrows and confirm with
ENTER. The display stops blinking, and the temperature displayed is used for compensation.
To change the unit of measurement between °C and °F, press the °C/°F key
twice .
C
ALIBRATION OF CONDUCTIVITY
The probe calibration can be carried out on one, two or three points using the standard solutions
automatically detected by the instrument (automatic calibration) or other solutions with known
value (manual calibration).
The new calibration deletes the data of the previous calibration . For example, if the instrument
is calibrated in 4 points and a new 1 point calibration is performed, the instrument will be calibrated
in 1 point only.
The CAL symbol will blink when the cell constant is modified using the menu (please see the de-
scription of the K_CELL menu item on page 12).
Automatic calibration of conductivity using memorized standard solutions
The instrument can recognize four standard calibration solutions:
•
0.001 Molar KCl solution (147
μ
S/cm @25°C),
•
0.01 Molar KCl solution (1413
μ
S/cm @25°C),
•
0.1 Molar KCl solution (12880
μ
S/cm @25°C),
•
1 Molar KCl solution (111800
μ
S/cm @25°C),
Using one of these solutions, the calibration is automatic; the procedure can be repeated with the
remaining standard solutions, up to a maximum of four different points.
The manual calibration is possible with a different conductivity solution from that used in the auto-
matic calibration.
The solution temperature for the automatic calibration must be between 15°C and 35°C: if
the solution temperature is under 15°C or over 35°C, the calibration is rejected: CAL ERR
indication appears.