11
e. Repeat steps
“e”
of “
Calibration with an ATC/Temp
probe in the pH NON- AUTOLOCK mode”
for 2 to 5
point calibration.
f. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the
calibrated buffers. After calibration, press and hold
“Mea./Eff.”
key for about 5 seconds to display the new
electrode efficiency and offset value.
C. pH Measurements
To take pH measurements, 6179M must be calibrated before
first use.
1. Measurement with an ATC/Temp probe in the pH-
AUTOLOCK mode.
a. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the meter.
The “ATC” icon will lit up.
b. Press
“Mode”
key until “pH”, “AUTO”, “ATC”, “buffer”
icons lit up. The “WAIT” icon will begin to flash.
c. Rinse the pH electrode and ATC/Temp probe with distilled
water and immerse in the sample to be measured. Remove
any air bubbles trapped around the probe by shaking or
stirring the probe.
d. Press the
“Mea./Eff.”
key. The “WAIT” icon will start
flashing. The unit is waiting for a stable reading. The
display will track the pH value as sensed by the pH
electrode and the ATC/Temp probe.
e. When the “WAIT” icon disappears, the reading is then
“LOCK” and will not respond to further changes from the
sample. The pH value shown is the pH value of the sample
at the displayed sample temperature.
[
Note:
For samples that are inherently unstable, the unit
will not AUTOLOCK. In this case, use the pH NON-
AUTOLOCK mode for measurements.]
2. Measurement with manual temperature compensation in
the pH-AUTOLOCK mode.
a. Connect the pH electrode to the BNC connector of the
meter. The “MAN” icon will lit up. Set unit to display the
sample temperature by pressing
“Up”
or
“Down”
key (0.0
