Hanna Instruments HI 2400 User Manual

Page 10

TEMPERATURE MEASUREMENTS
The probe has a built-in temperature sensor.
The measured temperature is indicated on the secondary LCD as shown
above.
Allow the probe to reach thermal equilibrium before taking any measurement.
This can take several minutes. The greater the difference between the
temperature at which the probe was stored and the temperature of the
sample, the longer the time will be.
Note: If “----” is displayed, the DO probe is not properly connected. This

also indicates the posibility of a broken probe cable. If temperature
displayed blinking, the temperature is out of range.

D O C A L I B R A T I O N

Calibrate the instrument frequently, especially if high accuracy is
required.
The instrument can be calibrated in maximum 2 points: 0.0% (

zero

calibration) and 100.0% (slope calibration).
The zero calibration of the

HI 2400 is very stable, therefore this procedure

needs to be performed only whenever the probe or the membrane is
replaced.
However, because the slope calibration is more critical, it is recommended
to perform this procedure every week.

INITIAL PREPARATION

• Pour small quantities of

HI 7040 Zero Oxygen

solution into a beaker. If possible, use a plastic
beaker to minimize any EMC interferences.

• Make sure the probe is ready for measurements

(see probe preparation on page 7), i.e. the
membrane is filled with electrolyte and the probe
is connected to the meter.

• Switch the meter on by pressing the

ON/OFF

switch.

• For an accurate calibration, it is recommended

to wait for at least 15 minutes to ensure precise
conditioning of the probe.

• Remove the protective cap from the DO probe.
• Set the appropriate altitude factor (see page 15). Make sure the

salinity factor is set to zero (see page 16).

HI 7040