12
TAKING ORP MEASUREMENTS
Connect the ORP electrode to the meter and press the ON/OFF key.
To enter the mV mode, press RANGE until the display changes to mV.
To take ORP measurements, simply submerge the bottom 4 cm (1½")
of the ORP electrode in the solution to be tested, stir gently and allow
for the reading to stabilize.
Note:
If measurements are taken successively in different samples, it
is recommended to rinse the electrode thoroughly with deion-
ized water or if not available tap water first and then with
some of the next sample to condition the electrode before
immersing it in the sample to be tested.
Immerse the temperature probe in the solution (allow a few minutes
for the temperature to stabilize) and press the ON/OFF key. The
temperature is displayed in the lower LCD.
Note:
If temperature measurement is out of range the LCD will
display " - - -".
Note:
If manual temperature compensation is selected (see Setup
"tC"), the lower display will show the manual temperature
used to pH compensation.
Note:
If no temperature probe is connected, the instrument auto-
matically switches to "Manual temperature compensation" working
mode.
TAKING TEMPERATURE MEASUREMENTS
Note:
If measurements are taken successively in different samples, it
is recommended to rinse the electrode thoroughly with deion-
ized water or, if not available, tap water first and then with
some of the next sample to condition the electrode before
immersing it in the sample.
21
ALT
GLP
RANGE
from 01 to 15 days or disable this function by selecting OFF. The
default setting is OFF.
When turned on, the meter checks if the
time-out time has expired. If the time has
run out, the message "CAL duE" scrolls across
the LCD. The "CAL" and "DATE" symbols will
blink as a reminder.
Alarm time-out is also signaled when viewing logged data through
the "Cal" and "Due" message.
GLP AND RS232
All the GLP data can be retrieved (if the electrode is connected) from
a PC through the RS232 communication feature. The calibration data
are transferred to the PC along with measurement data (see "Data
transfer to PC" section).
LAST CALIBRATION DATA
Last calibration data are stored automatically after a successful
calibration and they can be displayed by pressing the GLP key.
To view pH calibration data
• Press the ALT and GLP keys when the
meter displays pH reading.
• The LCD will then display the electrode
condition if available. If electrode condi-
tion is not available or by pressing the
RANGE key, the meter will display the last pH calibration date.
• Press RANGE key to scan remaining data, in the following order:
- last calibration time
- electrode offset value in mV ("OFF" appears in the lower LCD)
- electrode slope in mV/pH ("SLP" appears in the lower LCD)
- first point calibration buffer
- second point calibration buffer (only if a 2-point calibration has
been performed).
If calibration was performed with an old or dead probe, the
message "Old probe" or "Dead probe" will scroll on LCD.
• The meter will then return to normal operating mode. Press the
ALT and GLP keys to escape before viewing all the data.
To view mV calibration data
• Press the ALT and GLP keys when the meter displays mV reading.
• The LCD will then display the last mV calibration date.
