General Tools and Instruments DCM7021 - Manual (Page 5)

OPERATING PROCEDURE:
ACCESSORIES
Upon receiving the shipment, inspect the container and equipment for any signs of damage.
Verify that you have received all the items listed: Meter, Standard Solution 1413 µS/cm,
Battery (installed), Lanyard, Instruction Manual and Carrying Case.
PREPARATION
1. Remove the protective cap from the meter. Rinse the electrode with clean water and wipe it
dry.
2. Press button to turn the meter power on.
Note: Don’t touch or wipe the surface of inner black sensor of the conductivity cell.
CALIBRATION
Dip the conductivity cell into the standard solution 1413 µS/cm. Stir gently and wait until the
display is stabilized. Press and hold
button to enter calibration mode until the icon
CAL
appears in the display, and flashes 1413 µS/cm. When the display stops flashing and indicates
“SA”, and then “End” while calibration is ending, it will return to measurement mode.
Note: (1) Calibration with a 12.88 mS/cm standard solution would be better for measuring high
conductivity solution.
(2) The icon
will appear automatically during calibration mode.
(3) “SA” will not appear if the calibration fails.
(4) If the reading is not 0 µS/cm while the meter is in the air and not dipped into any
solution, then calibrate it in the air to make the reading become 0 µS/cm.
MEASUREMENT
1. After calibration, rinse the conductivity cell with clean water and wipe it dry. Dip the
conductivity cell into sample solution to be measured. Stir gently and wait until a stable
reading can be obtained.
2. Press button to select the desired measurement mode Conductivity, TDS or Salinity.
Note: (1) “_ _ _ _” will appear in the display when it is over the measuring range.
(2) The unit will auto-range to µS/cm or mS/cm, ppm or ppt.
FUNCTIONS MODE
1. Press button to enter Hold function mode.
The icon
HOLD will appear, and the reading value in the display can be locked.
Press button again to return to Measurement mode.
2. Press and hold button to enter the measuring Maximum and Minimum function mode.
Hold button until a flashing icon
MAX and MIN appears in the display. The value of maximum
and minimum will appear in the display while pressing the button lightly. To exit this mode,
press and hold
button until icon
MAX and MIN disappears, and returns to Measurement
mode.
COND
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 5