Thermo Fisher Scientific Alpha COND 550 - Manual (Page 21)

Instruction Manual
Alpha-
COND 550
15
4.2 Calibration
The monitor requires one-point calibration. Conductivity calibration is always
carried out in the specific measuring range selected for the monitor. Make
sure, the monitor is set to desired measuring range before you enter
calibration mode (Refer Section 5.4 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
monitor. (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 monitor reverts to measurement mode and the monitor 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 monitor is configured (Refer section 5.5 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
uncalibrated (default) reading of the solution. The buffer annunciator
appears in LCD. The ‘READY’ annunciator appears when the reading is
stable.
Once the reading stabilizes press the ▲ or ▼ key to adjust the upper
display value to that of the standard solution. Press the ENT key to
accept the value.