5. ADDITIONAL FEATURES
(a) The instrument has built-in "Auto Power Shut-off"
in order to prolong battery life. The meter will switch
off automatically if none of the buttons are pressed
within 10 min.
To de-activate this feature, Select the memory record
function during measurement, by pressing the
"RECORD" button(3-6, Fig.1).
(b) The instrument also features the ability to adjust the
contrast of the display.
This is achieved by controlling the "LCD Contrast
Adjust" pot (3-5, fig. 1).
6. CALIBRATION PROCEDURE
The meter has been calibrated during manufacture.
However, it may be necessary to re-calibrate periodically.
Particularly if the instrument is used foe a long period or if
the conductivity electrode is changed.
To re-calibrate the instrument, follow the procedures
shown below :
(1) Prepare a " 1.413 mS Calibration Solution ".
(2) Slide the " Range Select Switch "(3-9, Fig. 1) to "2 mS"
position.
(3) Immerse the " Conductivity Electrode "(3-5, Fig. 1)
into the solution up to the immersion level.
(4) Adjust the " Calibration Adjust Pot "(VR4, Fig. 2),
located within the battery compartment, until the display
indicates the value of the calibration solution.
FRONT PANEL
VR VR
VR VR VR
1
2
3
4
6
Fig. 2
x
battery compartment
8