Hanna Instruments wm 8910 User Manual
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TEMPERATURE COMPENSATION
(for WM 8910 and WM 8911 only)
(for WM 8910 and WM 8911 only)
• Manual temperature compensation can be selected by short-
ing the MTC to the middle terminal. The temperature is then to
be manually adjusted with the temperature dial.
be manually adjusted with the temperature dial.
• Automatic temperature compensation can be selected by
shorting the ATC and the middle terminal. Cut off the connector of
a HI 7669/2W temperature probe (optional). Strip the two wires
and connect them to the “°C sensor” terminals of the output
contacts.
a HI 7669/2W temperature probe (optional). Strip the two wires
and connect them to the “°C sensor” terminals of the output
contacts.
TAKING MEASUREMENTS
Make sure that the controller together with the electrode or probe has
been calibrated before operating the instruments (see following
pages).
Adjust the pH, ORP or conductivity setpoint(s) following the instruc-
tions on page 31.
Immerse the electrode and/or probe in the test solution and set the
switch to "MEASURE" (for WM 8910, WM 8911, WM 8920 and
WM 8930 only).
been calibrated before operating the instruments (see following
pages).
Adjust the pH, ORP or conductivity setpoint(s) following the instruc-
tions on page 31.
Immerse the electrode and/or probe in the test solution and set the
switch to "MEASURE" (for WM 8910, WM 8911, WM 8920 and
WM 8930 only).
The actual pH, ORP or conductivity value of the test solution will be
displayed.
displayed.
When activated, the alarm contacts will open or close, triggering
the mechanism of your choice, whether a buzzer, light or any
other electrical devices (the alarm is a necessity specially with
installation in remote locations or when corrective action must be
taken immediately).
the mechanism of your choice, whether a buzzer, light or any
other electrical devices (the alarm is a necessity specially with
installation in remote locations or when corrective action must be
taken immediately).
Model
Alarm is activated when the reading varies:
WM 8910
±2.0 pH from the setpoint
WM 8911
-2.0 pH lower than the SET LO or +2.0 pH higher than the SET HI
WM 8912
±2.0 pH from the setpoint; ±200 mV from the setpoint
WM 8913
±2.0 pH from the setpoint; ±0.5 mS/cm from the setpoint
WM 8920
±200 mV from the setpoint
WM 8923
±2.0 pH from the setpoint; ±0.5 mS/cm from the setpoint
WM 8930
±500 µS/cm from the setpoint
• The recorder output terminals (for WM 8910, WM 8911,
WM 8920 and WM 8930 only) are isolated from the controller
circuitry to avoid any interference. They are user-switchable
between 0 to 20 mA or 4 to 20 mA as shown below and are
proportional to the measured pH, ORP or conductivity values.
circuitry to avoid any interference. They are user-switchable
between 0 to 20 mA or 4 to 20 mA as shown below and are
proportional to the measured pH, ORP or conductivity values.
OR