Omega CDH-SD11 User Manual page 7

Conductivity electrode (K=10):
Long press SET + CAL buttons to enter Cond. calibration mode. Short press MODE button to enter 12.8 mS
calibration mode. Immerse the cond. probe (K=10) to standard 12880 us/cm buffer solution. Display will show
the standard conductivity 12.8 mS value in the first layer. Long press SET button to finish calibration, screen
will show "SA".
To escape calibration mode without saving setting, long press SET+CAL buttons, the bottom of screen will
show "ESC" few seconds and return to normal measurement mode.
NOTE: The display shows 12.88 means 12.88 mS (12880 uS/cm).
5) Change the temp. coefficient is necessary. Default setting is 2.01% per ℃.
Using a suitable temp. coefficient of the solution will provide good results.
The temp. coefficients of the following electrolytes generally fall into the ranges shown below:
To enter the temperature coefficients by long press SET+UNIT, then short press MODE to toggle
Cont I FtdS. And go to select "t I F"and set the value.
HOLD: ↑to increase ADJ: ↓to decrease SET: ← to left digit CAL: → to right digit
Long press SET button to finish calibration, screen will show "SA" .The adjustable range is 1% to 7.4%.
Or to escape setting by long press SET+UNIT, the bottom of screen will show "ESC" in few seconds and
return to normal measurement mode.
Solution
Acids
Bases
Salts
Drinking water
Ultrapure water
c) Conductivity measurement:
NOTE: For measuring high conductivity reading such as seawater, ensure to purchase cond. electrode (K=10).
1) Prepare the Conductivity electrode, install the "electrode plug" into the left "BNC port" of the meter.
2) Power on the meter by short pressing PWR button.
3) Hold the electrode handle by hand and let the sensing head immersed wholly into the measured solution.
Shake the probe to let the probe's internal air bubble drift out from the sensing head.
Display will show the conductivity mS (uS) values.
2-2 TDS
a) Calibration by using Conversion Factors
TDS values are related to conductivity. To calibrate the meter by using conductivity standards as described
in 2-1-b (Page 6) and select the correct TDS conversion factor. You can refer to below table or calculate the
TDS conversion factor for other solutions by using the formula. Meter default is 0.66.
Temp. Coefficients
1.0 - 1.6% / ℃
1.8 - 2.2% / ℃
2.2 - 3.0% / ℃
2.0% / ℃
5.2% / ℃
5