Thermo Fisher Scientific Alpha COND 560 - Manual (Page 22)

16
4.2 Calibration
The controller requires one-point calibration. Conductivity calibration is always
carried out in the specific measuring range selected for the controller. Make sure,
the controller is set to desired measuring range before you enter calibration mode
(Refer Section 5.6 for selecting measuring ranges).
Select a suitable standard conductivity solution so that its conductivity value is
within 10% to 100% of the full scale of the selected measuring range of the
controller. (For better accuracy, select the calibration standard to be nearly 50% of
the full scale of the measuring range selected.) Prepare calibration standard
solution in two beakers – one for rinsing and the other for calibration. Prepare
separate de-ionized water for electrode rinsing.
All new calibration values will automatically override existing calibration data. If you
wish to abort the calibration, press
▲ and ▼ keys simultaneously and the controller
reverts to measurement mode and the controller will revert to previous calibration
data.
CAL
HOLD
CAL
HOLD
MEAS
°C
ATC
READY
ENT
1 2
CAL
HOLD
3
ENT
HOLD
K=
2
CAL
HOLD
K=
µS
CAL
HOLD
4
READY READY
OR
µS
CAL
HOLD
3
µS READY
ENT
2
MEAS
°C
ATC
READY µS
1 1 From measurement mode press CAL key to enter calibration mode.
2 The display briefly shows the cell type (“2 CELL” or “4 CELL”) to which
the controller is configured (Refer section 5.7 for cell type settings)
Next, the last configured cell constant (k) is displayed in the upper
display. Use ▲ or ▼ keys to adjust the cell constant to mach the cell
constant of the conductivity probe. Adjustable range is 0.10 to 10.0.
Press ENT key to confirm the new cell constant value.
Rinse the electrode in de-ionized water and then rinse with the
calibration standard. Immerse the probe in calibration standard
solution intended for calibration and swirl gently to create a
homogenous sample. Make sure there are no any air-bubbles trapped
in the sensor.
3 The upper display shows the currently measured conductivity value of
the solution based on last calibration (if any). The lower display shows