Hanna Instruments LP 2000 - Manual (Page 6)

11 10
Calibration is recommended at least once a month. You can verify the
instrument calibration by comparing the display reading against the
supplied standard solution at 10 FTU. To check the date of the last
calibration, simply hold the DATE/ key down for a few seconds.
CALIBRATION PROCEDURE
• Turn the meter on and wait for the display
to show "----".
• Press the CAL key once. "CAL" will blink on the display for approx.
6 seconds, allowing for confirmation.
• While "CAL" is still blinking, press CAL again (otherwise, it exits
this mode). "CL" will appear on the lower part of the display.
• The date of calibration may now be edited
by simply pressing the DATE/ key. The
default parameter, which is the month
segment found on the left, will blink. To
scroll to the correct number, press the
READ/s key. To toggle between month
and the day display segments, press the
DATE/ key. The day segment can also
be edited with the READ/s key.
• To confirm the displayed values and to proceed, press CAL once
more. An intermittent "ZERO" will appear on the LCD.
CALIBRATION
• Using the HI 93703-0 bottle containing
the ZERO FTU Standard (or turbidity-free
water), fill the measurement cuvette and
secure the cap.
Note: To minimize error caused by the cu-
vette, it is recommended to use the
same cuvette for calibration and mea-
surement.
• Insert cuvette into the holder.
• Press CAL. An intermittent “SIP” indicates that the instrument is
being calibrated.
• After approximately 1 minute, the instru-
ment will ask for the HI 93703-10
standard solution @ 10 FTU by display-
ing “10.0”.
• Refill the cuvette with the HI 93703-10
AMCO-AEPA-1 standard at 10 FTU and
place it into the measurement cell
• After the second calibration point (10
FTU) has been accepted, the meter will
display “500”, asking for the 500 FTU
solution to be placed in the cuvet holder.
Note: At this point the user can exit the calibration mode and save
the two-point calibration by pressing READ.
To perform a three-point calibration, place the 500 FTU standard
solution in the cuvet holder.
• Press CAL: “SIP” and “CL” will start
blinking.
• After approximately 30 seconds, the dis-
play will show "----".
Now the meter is calibrated and ready for use.