68
APT4000PH
Display
Action
Remark
Buffer recognition
While the “hourglass” icon flash-
es, the electrode and temperature
probe remain in the first buffer
solution.
Automatic calibration with Calimatic (BUF -xx-)
Temperature detection automatic or manual
Press
CAL
key, enter code 1100.
Select with
key,
edit number with
key,
proceed with
ENTER
Remove the electrode and
temperature probe, clean them
and immerse them in the first
buffer solution (in any order).
When “Manual temp detection”
has been configured, enter value in
the secondary display using the
arrow keys. Start with
ENTER
.
If an invalid code is
entered, the
APT4000PH returns
to measuring mode.
The response time of
the electrode and
temperature probe is
considerably reduced
if the electrode is
first moved about in
the buffer solution
and then held still.
Buffer recognition terminated,
the nominal buffer value is dis-
played.
Analyzer in Hold
mode, measured
value frozen.
Sensoface inactive.
The analyzer can only operate properly when the buffer solutions used correspond
to the configured set. Other buffer solutions, even those with the same nominal
values, may demonstrate a different temperature behavior. This leads to measure-
ment errors.
69
Display
Action
Remark
Stability check:
The measured mV value is dis-
played.
To abort stability
check: Press
CAL
.
(accuracy reduced)
Calibration with the first buffer is
terminated. Remove the electrode
and temp probe from the first
buffer solution and rinse them
thoroughly.
• One-point calibration:
End with
CAL
.
Slope [%] and asymmetry poten-
tial [mV] of the electrode are dis-
played. Proceed with
ENTER
.
For one-point
calibration only:
• Two-point calibration:
Immerse electrode and temp
probe in the second buffer
solution.
Start with
ENTER
.
The calibration
process runs again as
for the first buffer.
Retract electrode and temp probe
out of second buffer,
rinse off, re-install.
Repeat calibration:
CAL
,
End calibration:
ENTER
.
Slope and asymmetry
potential of electrode
(related to 25 °C) are
displayed.
pH value and Hold are displayed
alternately.
Proceed with
ENTER
.
Hold is deactivated after 20 s
Security prompt.
