Electro-Chemical Devices (ECD) H10C - Manual (Page 6)

6
Keys
On/Off-
Powers on and shuts off the meter.
Mode-
Selects display mode. In normal operation, press Mode
to sequentially display compensated conductivity,
salinity, total dissolved solids (TDS) and uncompensated
conductivity. In calibration mode, this key exits the
current calibration and displays the next calibration
parameter.
Up/Down-
Increases or decreases the displayed value as desired
Cal-
In normal operation, changes the mode from Normal to
Calibration.
Enter-
In Calibration Set-up, press this key to save the current
parameter to memory.
OPERATIONAL PROCEDURES
A. Preparing Standard Solutions
Suitable conductivity standards are available commercially or the
user can prepare them using research grade reagents.
Here are some standard solutions the user can prepare to calibrate
the probe of the model EC3840.
1. Standard solution of 1413uS at 25°C: Accurately weight
out 0.746 grams of research grade dried Potassium
Chloride (KCL). Dissolve in 1000ml of distilled water.
2. Standard solution of 12.90mS at 25°C: Accurately weight
out 7.4365 grams of research grade dried Potassium
Chloride (KCL). Dissolve in 1000ml of distilled water.