Myron L 4P (includes Addendum 10-01) - Manual (Page 9)

c. Leaving Calibration
You know you are finished when the “ CAL ” icon goes out. Pressing any
measurement key abandons changes not yet accepted and exits
calibration mode.
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, wrong standard solution, or a very dirty
cell cup (ref. Troubleshooting Chart, pg. 21).
C. Calibration Procedures
1. Conductivity or TDS Calibration
a. Rinse conductivity cell three times with proper standard (KCl,
NaCl, or 442) (ref. Con./TDS Standard Solutions, pg. 22). For
user calibration see User Calibration Cond./TDS, pg. 15.
b. Refill conductivity cell with same standard.
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 or hold a key down to cause rapid scrolling of 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.
14
COND T D S
CAL
MCLR
M S
MR
CAL
MCLR
°C
CAL
µ S
COND
4 4 2
Figure 5
2. User Calibration Conductivity/TDS
a. Rinse conductivity cell three times with your standard.
b. Refill conductivity cell with same standard.
c. Press or , then press twice in COND/three
times in TDS. The “ CAL ” icon will appear on the display.
d. Press or to step the displayed value toward the
standard’s value or hold a key down to cause rapid scrolling of the
reading.
e. Press once to confirm new value and end the calibration
sequence for this particular solution type.
3. Resistivity Calibration
Resistivity is the reciprocal of Conductivity. Resistivity is calibrated only if
conductivity is calibrated for the same solution type.
4. Reloading Factory Calibration (Cond or TDS)
If calibration is suspect or known to be wrong, and no standard solution is
available, the calibration value can be replaced with the original factory
value for that solution. This “FAC” value is the same for all Ultrameters,
and returns you to a known state without solution in the cell. The “FAC”
internal electronics calibration (which bypasses the electrodes and cell) is
not intended to replace calibration with conductivity standard solutions. If
another solution type requires resetting, change solution type and
repeat this procedure.
a. Press or .
b. Press . (If in USER solution mode, press CAL key twice if
in Conductivity, and three times if in TDS to skip over tempco and
ratio adjustments.)
c. Press key until “ FAC ” appears and release.
d. Press to accept the factory calibration setting.
15
COND T D S
CAL
MCLR
M S
MR
CAL
MCLR
CAL
MCLR
COND T D S
CAL
MCLR
M S