34
mV SETUP
The mV Setup menu allows the user to set the parameters associated with mV and Relative mV
measurements. These parameters can be set specifically for each channel (
HI 5222
only). The settings will
be applied only to the active channel.
Accessing mV Setup
• Press
while in
Measure
mode and then
or
to select mV / Rel mV range for the desired
channel.
• Press
and then
to access mV Setup menu.
To access a mV Setup option:
• Use
or
to highlight the desired option.
• Press
to access the selected option.
The following is a detailed description of the mV Setup option
screens.
Profile
See pH Setup section.
Temperature
ORP measurements are not temperature compensated, although
ORP values can change with temperature (e.g. reference electrode
potential changes, sample equilibrium changes). It is important to
report ORP values together with the reference electrode used and the
temperature of measurement.
This option permits selection of the temperature source (
HI 5222
only) and measurement units.
47
Verify the pH electrode and instrument has been calibrated before making pH measurements.
DIRECT MEASUREMENT
To measure the pH of a sample using the Direct reading mode:
• Press
and then
to select
pH Measure
mode (select channel first for
HI 5222
).
• Select the Direct reading mode (see pH Setup for details).
• Place the electrode tip and the temperature probe
approximately 4 cm (1.5”) into the sample to be tested.
Allow time for the electrode to stabilize. “
Stable
” will
appear.
• The measured pH value will be displayed on the LCD,
together with a short GLP information and display preferences.
Note
: If the reading is out of range, “
----
” will be displayed
on the LCD.
DIRECT/AUTOHOLD MEASUREMENT
To measure pH of a sample using the Direct/AutoHold reading
mode:
• Press
and then
to select
pH Measure
mode (for the selected channel -
HI 5222
only).
• Select the Direct/AutoHold reading mode (see pH Setup for
details).
• Place the electrode tip and the temperature probe
approximately 4 cm (1.5”) into the sample to be tested.
• The measured pH value will be displayed on the LCD. Press
and the “
AutoHold
” indicator will start blinking
on the LCD until the stability criterion is reached. The pH
value will be frozen on the LCD, along with “
AutoHold
” indicator.
•
Unrecognized buffer. Please check the buffer or the buffer list
(for Semiautomatic and Automatic
buffer entry type): this message appears if the current buffer value is not close to any of the buffers from
the buffer list/group. Check if the current buffer is present in the buffer list or the appropriate buffer group
was selected.
•
The current buffer was already calibrated:
change the buffer or press
to exit calibration
mode.
pH MEASUREMENT
