Hanna Instruments HI 95711 - Manual (Page 8)

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KEYPAD DESCRIPTION
• ON/OFF: to turn the meter on and off.
• ZERO/SET: this is a bi-functional key: press to zero the meter prior to measurement, or hold
the key for 3 seconds to select the desired parameter (Free or Total Chlorine).
• READ/TIMER: this is a bi-functional key, just press for making a measurement, or hold the
key for 3 seconds to start a pre-programmed countdown prior to measurement.
• CAL CHECK: this bi-functional key allows to perform validation of the instrument just pressing
the CAL CHECK key, or hold the key for 3 seconds to enter the calibration mode.
OPERATING MODES
• Measurement mode: default operation mode, enables both validation and measurement.
• Calibration mode: may be entered by keeping CAL CHECK pressed for three seconds (the
“CAL” icon appears), it enables calibration of the instrument.
DISPLAY ELEMENTS DESCRIPTION
1) four digit main display area.
2) CAL: appears when the instrument operates in the calibration mode.
3) the Month and Day icons appear above the number of month and day when a date is displayed.
4) the blinking “Battery” icon appears when the battery voltage is getting low.
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CALIBRATION PROCEDURE
• Select the parameter code for free chlorine “701”
ot total chlorine “711” by holding ZERO/SET
(see pag. 13).
• Enter the calibration mode by holding CAL CHECK
for three seconds.
• The date of the last calibration appears (e.g.:
month “01”, day “08”). “F.CAL” means that
the factory calibration is selected.
Note: at this point it is possible to reset the
instrument to restore FACTORY CALIBRATION,
see instructions page 19.
• Place the CAL CHECK™ Standard Cuvet A into
the holder and ensure that the notch on the cap is
positioned securely into the groove.
• Press ZERO and “SIP” will blink on the display.
• After a few seconds the display will show
“-0.0-”. The meter is now zeroed and ready for
calibration.
• Remove the cuvet.
• Place the specific CAL CHECK™ Standard Cuvet B
into the holder:
Free Chlorine: Total Chlorine:
B, HI 95701-11 B, HI 95711-11
Ensure that the notch on the cap is positioned
securely into the groove.
or
Note: It is possible to interrupt calibration procedure at any time by pressing ON/OFF.
Warning: do not validate or calibrate the instrument with standard solutions other than the Hanna
CAL CHECK™ Standards, otherwise erroneous results will be obtained.
or
CALIBRATION PROCEDURE