General Tools and Instruments WK7200 User Manual
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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 below:
Meter, Conductivity cell, Buffer Solution pH 4 & 7, Standard Solution 1413 S/cm, Soaking
Solution, Lanyard, Battery (installed), Instruction manual, Carrying case.
Optional: ORP electrode
PREPARATION
1. Remove the protective cap and unscrew soaking bottle #(pH, ORP only) from meter. Rinse the
electrode with clean water and wipe it dry. Don't leak soaking solution from bottle and place
the protective cap back on the bottle at the end of usage.
2. Press
button to turn the meter power on.
Note: Don’t touch or wipe the surface of the inner black sensor of the conductivity cell.
CALIBRATION
＜pH＞
1. Make sure the sensor is pH electrode or check the icon
shown on the LCD display.
2. Dip the electrode into the buffer solution pH 7. Stir gently and wait until the display is
stabilized. Press and hold
button to enter calibration mode until the icon
CAL appears on
the display, and # flashes 7.00. When the display stops flashing and indicates “SA”. It will be
followed by “End” while calibration is ending, and then will return to measurement mode.
3. Rinse the electrode with clean water and wipe it dry. Dip the electrode into the buffer
solution pH 4. Stir gently and wait until the display stabilizes. Press and hold
button to
enter calibration mode until the icon
CAL appears on the display, and flashes 4.00. When the
display stops flashing and indicates “%” (percentage of slope), then “SA”. It will then be
followed by “End” while calibration is ending, and then return to measurement mode.
4. After slope calibration pH 4 or pH 10, the display will indicate percentage of slope (PTS) to
show the status of electrode. If the PTS is below 70% or above 130%, the electrode must be
replaced. A slope of 100% is ideal.
Note: (1) Icon “SA” will not appear if the calibration fails.
(2) When doing a 2 or 3 point calibration, Calibrate with buffer pH 7 first, and then follow
with buffer pH 4 or pH 10.
PH
WK7200 Manual-FINAL 8-18-08:Layout 1
8/15/08
11:52 AM
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