Hanna-instruments HI 93703 User Manual download pdf (Page 7)

1312

CALIBRATION

A monthly calibration is recommended. To

check the date of last calibration, simply hold

the DATE/⇒ key down for few seconds.

A more frequent check of the instrument is

suggested by using the supplied standard solu-

tion.

CALIBRATION PROCEDURE

• Turn the meter on and

wait for the display to

show "----".

• Press the CAL key

once, the "CAL" mes-

sage will blink on the

display for about 6

seconds, then the

calibration mode

stops.

• While the "CAL" mes-

sage is still blinking,

press CAL again. The

instrument is now in

the calibration mode

and a "CL" will ap-

pear on the lower part

of the display. The

date of calibration can

be edited now by sim-

ply pressing the

DATE/⇒ key. To

scroll to the correct

number press the

READ/⇑ key. The de-

fault blinking param-

eter is the month, on

the left hand of the

display (MM.DD).

SOURCES OF INTERFERENCE

• Presence of floating debris and coarse sedi-

ments which settle out rapidly will give false

readings.

• The infrared light source used for HI 93703

turbidity meter, according to ISO 7027 Inter-

national Standard, can effectively minimize

errors due to colored dissolved substances.

This effect, named "true color", is a common

interference for most commercially available

instruments operating in the range of visible

light.

• Air bubbles and the effect of vibrations that

disturb the surface of the sample will give

false results.

• Dirty glassware could also affect readings

along with scratched or edged vials.

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