CALIBRATION
Calibration setup contains five sections: TDS, Cell, Temperature Coefficient, Temperature
reference, and Conductivity Calibration. To access these sections:
1.
Connect the conductivity probe and cable assembly to the unit and turn the unit on. The
screen will display
CELL
and the cell constant of the conductivity probe.
2.
Allow temperature readings to stabilize, then press
CAL
to enter the calibration mode;
CAL
appears on the LCD. Press
MODE
to sequentially display the following sections:
Note:
Press Enter (
) to accept any values changes in each section and automatically
advance to the next section. If there are no changes, the unit accepts the current value and
proceeds to the next section.
TDS
TDS is determined by multiplying conductivity (mS) by a TDS factor. The default factor value is
0.65. To change the TDS factor, use the
Δ
and
∇
keys to adjust the value between 0.30 and
1.00. Press Enter (
) to save the new value, or press
MODE
to cancel the change and display
the
CELL
screen.
CELL
The second screen will display
CELL
and the current cell value. The default cell value is 5.00
and is displayed in the lower right of the screen. The unit allows a variance of ±0.50 before
displaying an error message. The cell value cannot be adjusted at this screen; calibrating
conductivity is the only way to adjust the cell constant. Press Enter (
) to reset the cell
constant to 5.00 and display the
Temperature Coefficient
screen.
Note:
Be certain to press Enter (
) to reset the cell constant to 5.00. If
MODE
is pressed, the
unit retains the previous cell constant and calibrates from a value that is already offset.
Temperature Coefficient
The unit uses the temperature coefficient to calculate temperature compensated conductivity.
The default value is 1.91%. To change the temperature coefficient, use the
Δ
and
∇
keys to
adjust the value between 0 and 4.00%. Press Enter (
) to save the new value, or press
MODE
to cancel the change and display the
Temperature Reference
screen.
Temperature Reference
The unit uses the temperature reference value to calculate temperature compensated
conductivity. The default value is 25
°
C. To change the temperature coefficient, use the
Δ
and
∇
keys to adjust the value between 15 and 25
°
C. Press Enter (
) to save the new value, or press
MODE
to cancel the change and display the
Conductivity Calibration
screen.
Conductivity Calibration
1.
Immerse the probe in a standard of known conductivity, preferably a standard in the middle
range of the solutions to be measured. Completely submerge the probe without touching
the sides of the calibration container. Shake the probe lightly to remove any air bubbles
trapped in the conductivity cell.
2.
Allow temperature to stabilize. The message ‘rAng’ (range) may display briefly to indicate
unit auto-ranging; this is normal. After temperature stabilization, use the
Δ
and
∇
keys to
adjust the conductivity value to that of the conductivity standard at 25
°
C. Press Enter (
)
to calibrate. The unit beeps twice to indicate a successful calibration, then automatically
switches to normal operation mode.
CONDUCTIVITY MEASUREMENTS
1.
Turn the unit on. Place the probe in the solution to be measured. Completely submerge the
probe. Shake the probe lightly to remove any trapped air bubbles in the conductivity cell.
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