horiba LAQUAact D-74, Инструкция по эксплуатации

Страница: 55 / 112

Conductivity measurement
D-74 39
●
Performing measurement
Immersing the conductivity cell in the sample solution can perform measurement in the
measurement mode. Also, you can use the automatic hold function to perform stability
judgment of the measured value.
1. Press the key to change to the measurement
parameter to measure.
2. Wash the conductivity cell with pure water (or
deionized water) and wipe it with filter paper or
tissue paper.
Do not touch the black electrode part.
3. Immerse the conductivity cell in the sample
solution.
Immerse in the sample solution up to the hole in
the lower part of the cell.
4. While the conductivity cell is immersed in the sample solution, press the
key.
Stabilization judgment starts and the HOLD icon blinks. When the value is stabilized,
the HOLD icon changes from the blinking state to the lit state and the display is fixed
to the measured value at the stable time. Pressing the
key again releases fixing
the measured value.
Note
The criteria of stability judgment in the automatic hold measurement are as follows.
Conductivity: display value change for 10 seconds is less than 3 digit and temperature
change is less than 2.0°C
Salinity: display value change for 10 seconds is less than 1.0 PPT (0.01%) and
temperature change is less than 2.0°C
TDS: display value change for 10 seconds is less than 30 mg/L and
temperature change is less than 2.0°C
Resistivity: display value change for 10 seconds is less than 3 digit and temperature
change is less than 2.0°C
key Stabilized