Myron L 6Psi and 4P - Manual (Page 19)

15
measurement key cancels changes not yet accepted and exits calibration
mode.
Leaving pH after the 2nd buffer results in the same gain being entered
in place of the 3rd buffer.
2. Calibration Limits
There are calibration limits. A nominal “FAC” value is an ideal value
stored by the factory. Attempts to calibrate too far, up or down, from there
will cause the displayed value to be replaced with “FAC”. If you accept it
(press the “Cal” key), you will have the original default factory calibration
for this measurement. The need to calibrate so far out that “FAC” appears
indicates a procedural problem, incorrect standard solution, a very dirty
cell cup or an aging pH/ORP sensor (ref. Troubleshooting Chart, pg.
34).
C. Calibration Procedures
1. Conductivity or TDS Calibration
a. Rinse conductivity cell three times with proper standard (KCl,
NaCl, or 442) (ref. Cond/TDS Standard Solutions, pg. 36). For
user calibration see User Calibration Conductivity/TDS below.
b. Refill conductivity cell with same standard. KCl-7000 shown.
c. Press or , then
press ; “CAL” icon will
appear on the display
(see Figure 5).
d. Press or to
step the displayed value toward the standard’s value (7032 >
7000) or hold a key down to scroll rapidly through the reading.
e. Press once to confirm new value and end the
calibration sequence for this particular solution type. If another
solution type is also to be measured, change solution type now
and repeat this procedure.
2. User Calibration Conductivity/TDS
Instrument must be in “User” mode, see Solution Selection, pg. 11.
Figure 5
°C
KCl
COND
CAL