Battery
ON/OFF button
Liquid Crystal Display
Maximum Immersion Level
Thank you for choosing a Hanna Instruments product. Please read
this instruction manual carefully before using the instrument. For
additional information, visit www.hannainst.com or e-mail us at
tech@hannainst.com.
Speci cations
Range
0.00 to 14.00 pH
Resolution
0.01 pH
Accuracy
±0.1 pH
Calibration
Automatic, 2 points
Electrode
HI 1271 (included)
Environment
0 to 50 ºC (32 to 122 ºF); RH 95% max
Battery Type
1 x CR2032 Li ion
Battery Life
approx. 1000 hours of continuous use
Auto O
OFF, 8 or 60 minutes
Dimensions
50 x 174 x 21 mm (2 x 6.8 x 0.9“)
Weight
50 g (1.8 oz.)
Thank You!
Operation
Replace the battery when the battery symbol on the LCD blinks or
the meter cannot be switched on. When the battery is low “Erb“
message appears and the meter turns o automatically.
Remove the battery cover on the back of the meter. Replace the
battery with a new CR2032, while paying attention to its polarity.
Note: Batteries should only be replaced in a safe area using the
battery type speci ed in this instruction manual. Old batteries
should be disposed in accordance with local regulations.
Battery Replacement
• For best results, calibrate frequently.
• From measurement mode, press and hold ON/OFF button until
“CAL” message appears on display.
• Release the button and dip the tip of the electrode (bottom
4 cm/1½”) in 7.01, 4.01 or 10.01 pH bu er solution at room
temperature.
• On the display 7.01 pH will appear blinking.
• When the bu er is recognized the bu er value will appear and
“
“ will blink.
• The calibration is automatically performed.
• If the rst con rmed bu er is 4.01 or 10.01 pH, the calibration
is done “Sto“ will appear and the checker returns to normal
measurement mode.
• If the rst con rmed bu er is 7.01 pH, the checker asks for second
calibration point.
• On the display 4.01 pH will appear blinking.
• By pressing ON/OFF button, the calibration is done only in 7.01 pH
bu er. “Sto“ will appear and the checker returns to normal
measurement mode.
• For second calibration point, rinse the electrode with water and
dip it in pH 4.01 (or pH 10.01) bu er solution.
• Once the calibration has been automatically performed “Sto“ will
appear and the checker will return to normal measurement mode
with the calibrated bu er tags ON.
ALWAYS CALIBRATE USING FRESH BUFFER SOLUTIONS.
CLEAR CALIBRATION
• After entering in calibration mode, press and hold ON/OFF button
until “Clr” message appears on display.
• The checker will return to measurement mode with default
calibration.
Notes:
• If “Err“ message appears, check if the meter is in the correct bu er
or clean the electrode using HI 7061M cleaning solution.
• Press and hold the ON/OFF button until “d60” or “d08” or “d--”
appears. Press the ON/OFF button to cycle through the following
Auto Shut O options: 8 minutes (“d08”, default value), 60 minutes
(“d60”), OFF (“d--”). Press and hold the ON/OFF button to save
and continue to normal operation.
Meter Calibration
Checker Plus® is guaranteed for a period of one year after date of purchase
against defects in workmanship and materials when used for their intended
purpose and maintained according to instructions. This warranty is limited to
repair or replacement free of charge. Damage due to accidents, misuse, tampering
or lack of prescribed maintenance is not covered. If service is required, contact
your local Hanna O ce. If under warranty, report the model number, date of
purchase, serial number and the nature of the problem. If the repair is not
covered by the warranty, you will be noti ed of the charges incurred. If the
instrument is to be returned to Hanna Instruments, rst obtain a Returned
Goods Authorization number from the Technical Service department and
then send it with shipping costs prepaid. When shipping any instrument,
make sure it is properly packed for complete protection.
Before using Hanna Products, make sure that they are entirely suitable for
your speci c application and for the environment in which they are used.
Operation of these instruments may cause unacceptable interferences to
other electronic equipment, thus requiring the operator to take all necessary
steps to correct such interferences. Any variation introduced by the user to
the supplied equipment may degrade the instrument’s EMC performance. To
avoid damages or burns, do not put the instrument in microwave oven. For
yours and the instrument safety do not use or store the instrument in
hazardous environments.
All rights are reserved. Reproduction in whole or in part is prohibited without
the written consent of the copyright owner, Hanna Instruments Inc.,
Woonsocket, Rhode Island, 02895, USA.
IST98100
03/15
Warranty
Recommendations for Users
The pH electrode is shipped dry. Before using the Checker Plus
®
,
remove the protective cap and condition the electrode by soaking
the tip (bottom 4 cm/1½”) in pH 7.01 bu er solution for a couple of
hours. Then follow the calibration procedure.
• Do not be alarmed if white crystals appear around the cap. This
is normal with pH electrodes and they dissolve when rinsed with
water.
• Connect the electrode to the meter.
• Turn the Checker Plus
®
on by pressing ON/OFF button.
• Remove the protective cap and immerse the tip of the electrode
(bottom 4cm/1½”) in the sample to be tested.
• Stir gently and wait for stable reading.
NEVER IMMERSE THE ELECTRODE OVER THE MAXIMUM IMMERSION
LEVEL. THE CONNECTOR MUST BE ALWAYS CLEAN AND DRY.
• After use, rinse the electrode with water and store it with a few
drops of HI 70300 storage solution in the protective cap.
DO NOT USE DISTILLED OR DEIONIZED
WATER FOR STORAGE PURPOSES.
• Always replace the protective cap after
use.
4 cm
1.5”
Recommended
Immersion Level
pH Probe
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