Hanna Instruments HI 4521 User Manual

Page 15

Graph
Accessing this option, the online graph with the currently logged
values (pH, mV, Rel mV, ISE respectively Conductivity, Resistiv-
ity, TDS, Salinity vs. Seconds) will be displayed.
If there is no active log, the previously logged data for the
selected parameter will be plotted.
Notes: • If no data were logged, the graph displaying mode

will not be accessible.

• If no automatic log is saved, the offline graph will

not be available.

To access the offline / online graph:

• Press

while in

Measure mode. The “Choose Display

Configuration” message will be displayed in the Reminder
messages area.

• Press

When the

online graph is displayed:

• Use

and

to move the graph along horizontal (

Time) axis.

• Press

to access the zoom menu for the vertical (

Parameter) axis. Use

for

zooming vertical axis.

• Press

to return to the main menu.

When the

offline graph is displayed:

• Use the arrow keys to move the graph along the horizontal and vertical axes.

• Press

to access the zoom menu for horizontal and vertical axes. Use

, or

respectively

to switch

between the active zooming axes. Press

to zoom the selected axis.

Note: While in zoom graph menu the

key is not accessible.

• Press

to return to the main menu.

102

MEASURE

Rinse the conductivity probe with distilled water. Immerse the tip (bottom 4 cm /1½”) in the sample and
stir gently for a few seconds.
For a faster response and to avoid cross-contamination of the samples, rinse the probe with a few drops of the
solution to be tested, before taking measurements.

PERIODIC MAINTENANCE

Inspect the probe and the cable. The cable used for connection to the instrument must be intact and there must
be no points of broken insulation on the cable. Connectors must be perfectly clean and dry. Rinse off any salt
deposits with water.
If more cleaning is required, remove the probe sleeve and clean the probe with a cloth or a nonabrasive
detergent. Make sure to reinsert the sleeve onto the probe properly and in the right direction. After cleaning
the probe, recalibrate the instrument.
The platinum rings are sustained with glass. Take great care while handling the probe.

IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thoroughly with distilled
water.

PROBE CONDITIONING & MAINTENANCE

This manual is related to the following products:

HI 4522