Hanna Instruments HI 95734 - Manual (Page 11)

11
ERROR MESSAGES
a) on zero reading
This indicates that the zeroing procedure failed due to a low signal-to-
noise ratio. In this case press ZERO again.
“No Light”: the instrument cannot adjust the light level. Please check
that the sample does not contain any debris.
“Light Low”: there is not enough light to perform a measurement.
Please check the preparation of the zero cuvet.
“Light High”: there is too much light to perform a measurement.
Please check the preparation of the zero cuvet.
b) on sample reading
There is too much light for the sample measurement. Please check if
the right sample cuvet is inserted.
“Inverted”: the sample and the zero cuvet are inverted.
“Zero”: a zero reading was not taken. Follow the instruction in
the measurement procedure for zeroing the meter.
Under range. A blinking "0.00" indicates that the sample absorbs
less light than the zero reference. Check the procedure and make
sure you use the same cuvet for reference (zero) and measurement.
A flashing value of the maximum concentration indicates an over
range condition. The concentration of the sample is beyond the
programmed range: dilute the sample and re-run the test.
A flashing value lower than the maximum concentration indicates
a low signal-to-noise ratio condition. In this case accuracy of the
result is not guaranteed. Repeat the measurement procedure.
14
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “734f” or “734t” it is
ready. The display code that appears is the one
of the last selected parameter.
• keep ZERO/SET pressed to change parameter.
The parameter code will change every three
seconds, until the key is released. Select the
program for free chlorine “734f” or total chlorine
“734t”.
• After the desired parameter code appears on
the display, perform either MEASUREMENT,
VALIDATION, or CALIBRATION PROCEDURE
following the instructions reported in the related
chapter.
Code Parameter
734f Free Chlorine
734t Total Chlorine
or
• Important Note: Free and Total Chlorine have to be measured separately with fresh unreacted
samples if both values are requested.
OPERATIONAL GUIDE