pHep is a rugged pH tester with replaceable
electrode and renewable reference junction. The
instrument can be calibrated at two points by
the user, simply acting on the offset and slope
calibration trimmers.
CONDITIONING:
• Remove the cap.
• To activate the electrode, immerse it in
HI70300 storage solution for 2 hours.
CALIBRATION:
Perform one of the following two-point calibration
procedure, according to the required application:
Acid calibration for measurements below pH 7:
• Immerse the electrode in pH
7.01 (HI7007) buffer solution.
• Allow the reading to stabilize
and with a small screwdriver
turn the pH7 Calibration Trim-
mer until the display shows
"7.0".
• Rinse the electrode with tap water and immerse
it in pH 4.01 (HI7004) buffer solution.
• Allow the reading to stabilize and with a small
screwdriver turn the pH4/pH10 Calibration Trim-
mer until the display shows "4.0".
Alkaline calibration for measurements above pH 7:
• Immerse the electrode in pH 7.01 (HI7007)
buffer solution.
• Allow the reading to stabilize and with a small
screwdriver turn the pH7 Calibration Trimmer
until the display shows "7.0".
• Rinse the electrode with tap water
and immerse it in pH 10.01 (HI7010) buffer
solution.
• Allow the reading to stabilize and with a small
screwdriver turn the pH4/pH10 Calibration Trim-
mer until the display shows "10.0".
OPERATION:
• Remove the protective cap.
• Turn the meter on with the ON/OFF
switch located on the top of the meter.
• Immerse it in the solution to be tested
without exceeding the maximum immer-
sion level.
HI 70300
• Stir gently and wait for the reading to stabilize.
• After use, rinse the electrode with tap water to
minimize contamination.
• Store the electrode with a few
drops of storage (HI70300) or
pH7 (HI7007) solution in the pro-
tective cap.
• Always replace the protective cap after use.
DO NOT USE DISTILLED OR DEIONIZED WATER
FOR STORAGE PURPOSES.
• Large differences in pH readings (±1 pH) could
be due to lack of calibration or dry electrode.
MAINTENANCE:
The sensor should be kept moist at all times. For this
purpose, always keep wet the tissue inside the
protective cap. In case of erroneous readings even
after an accurate conditioning and calibration, the
reference junction might be contaminated or clogged.
Pull out 2 mm (1/8'') of the
cloth junction to renew the
electrode reference (it is rec-
ommended to cut the cloth
leaving always at least 2
mm -1/8'' over the reference
compartment) and repeat the
calibration procedure.
The cloth junction can be pulled out approximately
20 times. After that, the electrode can be replaced
(see the Electrode Replacement section).
BATTERY REPLACEMENT:
If calibration can not be performed or the display
fades, batteries level is low and batteries must be
replaced. Slide off the battery compartment cover
and replace all four 1.5V batteries while paying
attention to their polarity.
Batteries should only be replaced in a nonhazardous
area using the battery type specified in this instruction
manual.
pHep
®®
®®
®
HI 98107
Pocket-sized pH Meter
Manufacturers since 1978
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