7
OPERATIONAL PROCEDURES
A. pH Buffer Set Selection
The 6179MB meter has two buffer sets: 1.68, 7.00, 4.01, 10.01,
12.46 pH and 1.68, 6.86, 4.00, 9.18, 12.46 pH.
In pH mode, press
“Set/Clear”
key to enter the buffer set
selection mode. Use
“Up”
or
“Down”
key to select the
preferred buffer set. Press
“Slope/Enter”
key to save the
selected buffer set.
[
Note:
There is no need to repeat this procedure every time the
unit is power up unless one decides to change the buffer
settings.]
B. pH Calibration
The 6179MB uses up to 5 point calibration.
[
Note:
If the device is required to perform more than one
calibration points, the first calibration point must be 6.86/7.00
pH.]
1. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
a. Turn the unit on. In the pH mode, press
“Set/Clear”
key
for 5 seconds, all LCD elements will lit up. The meter
clears all calibration values stored in internal memory.
b. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit.
c. Press
“Mode”
key to go to pH-AUTOLOCK mode. “ATC”
icon, “pH” icon and “AUTO” icon will lit up. The "CAL" icon
begins to flash.
d. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution. Allow
temperature reading to stabilize, then press and hold
“Stand”
key for 2 seconds to calibrate. The
“
WAIT
”
icon
will flash until the unit detects a stable reading. Once the
unit calibrates the first point, the selected buffer will lit up
while two other selectable buffers start to flash. The unit is
ready to be sloped at the second buffer if the first buffer
solution is 6.86 or 7.00 pH.
[
Note:
At this moment, press the
“Mode”
key, the unit will
exit the calibration mode. Single point calibration is
complete.
