User Guide

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Operating Instructions αlpha-RES1000

6 Calibration Mode

Calibration mode can be accessed directly from Measurement mode by pressing CAL key and entering

the Calibration security code; or from the Advanced Setup mode.

6.1 Resistivity Calibration

Calibration is always carried out in the specific range selected. The Resistivity Controller allows a one-

point calibration.

1) Enter Calibration mode. While in Measurement mode,

press CAL key and scroll to Calibration code “11”. Press

ENTER key. The upper display reads “CAL” and lower

display, “rES”.

2) Press the ENTER key. The controller displays its last set

Cell Constant (k) of the cell as a percentage of the

theoretical value. Using the up and down key, the value can

be set to anywhere from 80 to 120%. Press the ENTER key

again to carry out calibration.

3) Immerse the Conductivity cell in a suitable standard

solution, whose value is within the measurement range

selected in the controller. Agitate the Cell in the solution to

remove any trapped air-bubbles. Note: The calibration

standard should have a value that is between 20% to 100%

of the range selected. For example, if the range in the

controller is selected to be 19.99 mΩ (range 1), then the

calibration standard value should be 4.00 mΩ to 19.99 mΩ.

4) Once the reading has stabilized, use the ∆ or ∇ keys to

adjust the measured value to that of the standard solution.

Press the ENTER key to accept the value and the controller

displays the revised condition of the probe The lower display

shows the factor “FCt” while the upper display shows the

ratio of ideal to adjusted calibration value.

Note: The acceptable calibration window is ±40% of the displayed (default) value. If the

displayed is 10.00 mΩ standard, the values to which it can be adjusted is 6.00 to 14.00 mΩ. If

there is a calibration error, the controller displays “ERR” annunciator. To recalibrate repeat step

3. To exit from calibration, push both ∆ and ∇ keys (escape) to resume to Measurement mode.

5) Press ENTER key. If you entered calibration mode using CAL key, controller will return to

Measurement mode. If you entered calibration mode from Advanced Set-up mode, controller will

return to sub-function menu.

Note: When calibrating with manual temperature compensation, controller automatically changes from

preset process temperature to calibration temperature. After leaving the Calibration mode, controller

switches back to process temperature (for setting calibration temperature and process temperature, see

section 7.2).

CAL

rES

HOLD SETUP

100.0

CEL

HOLD CAL

18.20

25.0

mΩ

ATC

1.01

FCt