12
3.
Rinse electrode with distilled water and immerse it in sample to
be measured.
4.
Press
“Mea./Eff.-”
. The “WAIT” icon will start to flash. The unit
is waiting for a stable reading. The display will track the mV
(Rmv) value as sensed by the ORP electrode.
5.
When the “WAIT” icon disappears, the reading is then “LOCK”
and will not respond to further changes from the sample. The
mV (RmV) value is the sample reading.
[
Note:
For samples that are inherently unstable, the unit will
not AUTOLOCK. In this case, use the mV (RmV) NON-
AUTOLOCK mode for measurements.]
b. Measurement in the mV (RmV) NON-AUTOLOCK mode.
1.
Connect the ORP electrode to the BNC connector of the unit.
2.
Press
“Mode”
until “mV” or “RmV” icon lit up.
3.
Rinse electrode with distilled water and immerse it in sample to
be measured.
4.
Allow sufficient time for the display to stabilize. The instrument
will display the mV (RmV) value of the sample.
G.
ION Calibration
The 6179 can measure ion concentration when using an
ion selective electrode (ISE) for the specific ion of interest.
The available ion calibration values are 0.10, 1.0, 10.0,
100.0, and 1000. Choose a minimum of 2 consecutive
values for calibration and prepare the corresponding ion
calibration solutions. For best results always begin with the
lowest standard value, followed by the next lowest standard.
The 6179 uses 2 to 5 point calibration.
a.
Calibration in the ION-AUTOLOCK mode.
1.
Turn the unit on. In ION-AUTOLOCK mode, press the
“Set”
to
enter the calibration point selection screen. Use
“Up”
or
“Down”
to select 2 to 5 point calibration.
2.
Press
“Slope/Enter”
to enter the monovalent ion/divalent ion
selection screen. Use
“Up”
or
“Down”
to select.
3.
Press
“Slope/Enter”
to enter the hold/clear selection screen.
Use
“Up”
or
“Down”
to select “CLr”. Press
“Slope/Enter”
.
The meter will clear all previously stored calibration values and
