Specifications
Range
0.0 to 14.0 pH
Resolution
0.1 pH
Accuracy
±0.2 pH @25 °C/77 °F
Calibration
Automatic, one or two-point
Electrode
Built-in probe for specific application
Battery Type
CR2032 Li-ion
Battery Life
Approximately 1000 hours of continuous use
Auto-off
8 minutes, 60 minutes or can be disabled
Environment
0 to 50 °C (32 to 122 °F); RH 95% max
Dimensions
51 x 151 x 21 mm (2 x 5.9 x 0.9“)
Weight
44 g (1.6 oz.)
Preliminary Examination
Remove the meter from the packing material and examine it carefully to make sure that
no damage has occurred during shipment. If noticeable damage is evident, contact your
local Hanna Instruments Office.
Each meter is supplied with:
• pH 4.01 buffer solution liquid sachet (2 pcs.)
• pH 7.01 buffer solution liquid sachet (2 pcs.)
• Cleaning solution for soil deposits
• Cleaning solution for humus deposits
• Electrode storage solution, 13 mL dropper
• Electrode fill solution
• Instruction manual
• Quality certificate
Note: Save all packing material until you are sure that the instrument functions
correctly. All defective items must be returned in the original packaging with the
supplied accessories.
Liquid Crystal
Display
ON/OFF
Button
Maximum
Immersion
Level
Recommended
Immersion Level
Procedure for Direct Ground Measurement
1) Verify meter is set up correctly and pH probe is calibrated.
2) Dig, discarding 5 cm of topsoil.
3) Perforate the soil (with
HI721319
soil auger) to a depth of about 20 cm or more.
4) If the soil is dry, moisten it with a small amount of tap water.
5) Wash the electrode with tap water (not distilled).
6) Insert the electrode pushing it slightly into the soil to ensure proper contact.
7) Observe the measurement.
8) Wash the electrode with tap water (not distilled) and (using a finger) gently remove
any soil remaining on the electrode (avoid using a rag or cloth).
9) Repeat the procedure in different locations in the field.
10) Consider the average of the measured data.
For best result, it is advisable to measure the pH of a soil solution, using a sample of
soil and soil preparation solution
HI7051
; it is better to use this procedure if you have
to test a stony field in which you risk damaging the electrode.
Probe Features
Removable PVDF reference sleeve
Polyvinylidene fluoride (PVDF) is a durable plastic that is resistant to most chemicals
and solvents, including sodium hypochlorite. It has high abrasion resistance, mechanical
strength and resistance to ultraviolet. PVDF is also resistant to fungal growth.
Operation
Press the ON/OFF button to turn the meter on. All tags
will be displayed.
The meter will go into measurement mode: current
reading and calibrated buffers are displayed.
Meter Calibration
From measurement
mode, press and
hold the ON/OFF
button until “CAL”
is displayed.
When “7.01” blinks
on the display, place
the tip of the probe
into a pH 4.01, 7.01
buffer solution.
When the
reading is stable,
the stability
indicator will
disappear.“Sto”
will be displayed
when the
calibration
is saved.
If pH 4.01 buffer
solution is used
as the first point
the value of the
buffer is recognized
and displayed
with the blinking
stability indicator.
Meter will
exit to
measurement
mode and the
calibration
tag will be
displayed.
One-Point Calibration with pH 4.01
B
On
e-
Po
in
t
Meter will exit
to measurement
mode and the
calibration
tag will be
displayed.
pH 4.01 will then
blink on the display.
Ignore it and press
ON/OFF button.
Tw
o-
Po
in
t
Use pH 4.01 to
perform a two-
point calibration.
The value is
automatically
recognized and
displayed with the
blinking stability
indicator.
When the reading
is stable, the
stability indicator
will disappear.
“Sto” will be
displayed when
the calibration
is saved.
Meter will exit
to measurement
mode and the
calibration
tags will be
displayed
.
If pH 7.01 buffer solution is used as
the first point
the buffer is recognized
with the blinking stability indicator.
When the reading is stable, the
stability indicator will disappear
and pH 7.01 will be calibrated.
If pH 7.01 is the only calibration point,
finish one-point procedure at right.
If using pH 4.01 as a second point,
continue two-point procedure at right.
Meter Overview
Preparation:
The pH electrode is shipped ready for use with a protective cap containing storage solution. Before
using the meter,
remove the protective cap
and inspect the probe to verify the bridge gel has
not dried out. Refresh the bridge electrolyte if necessary. Following care procedure (ignoring the
cleaning procedures).
Alternately, rinse off the probe tip with water and condition the electrode by soaking the tip (bottom
4 cm (1.5”)) in pH 7.01 buffer solution for several minutes. Perform a probe calibration before using.
• Do not be alarmed if white crystals appear around the cap. This is normal with pH
electrodes. Rinse off the probe tip with water before using.
• Turn the meter on by pressing ON/OFF button.
• Remove the protective cap. DO NOT SCRATCH THE GLASS. Do not use the probe to bore
a hole through the soil. Make sure an entry hole is made in the soil and water has been
added. After placing the probe in the hole, wait for a stable reading.
NEVER IMMERSE THE ELECTRODE OVER THE MAXIMUM IMMERSION LEVEL.
• For best results, recalibrate periodically.
• After use, rinse the electrode with water and store it with a few drops of storage solution
in the protective cap.
• Reattach the protective cap after each use.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES.
A
One or Two-Point Calibration with pH 7.01
For one-point calibration using pH 4.01 buffer go to procedure B
For one or two-point calibration using pH 7.01 buffer go to procedure A
A
B
Open Reference Junction with
removable sleeve design
Suspended solids can permanently clog the pores
of a ceramic reference junction. The open junction
design provides a constant junction potential and
minimizes blockage by providing an open gel
interface between the sample and internal Ag/AgCl
reference. Should soil enter into the junction, the junction can be easily cleaned and
refreshed with new bridge electrolyte.
pH Probe
Thank You
Thank you for choosing a Hanna Instruments product. Please read this instruction
manual carefully before using this instrument.
For technical support, contact your local Hanna Instruments Office or email
us at [email protected].
To find your local Hanna Instruments Office or for additional information on Hanna
Instruments products, visit www.hannainst.com
Battery
indicator
Unstable
tag
Measurement
unit
Digits
Calibration
tags
"Sto" will be
displayed when
the calibration
is saved.