pHep®+
HI 98108
Pocket-sized pH Meter with Automatic
Temperature Compensation
Manufacturers since 1978
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.
The Automatic Temperature Compensation feature enhables high accuracy in measurements.
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 Trimmer 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 Trimmer 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 Cali-
bration 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 Trimmer 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 immersion level.
• 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 |
0 |
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0 |
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drops of storage (HI70300) or |
3 |
7 |
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I |
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H |
pH7 (HI7007) solution in the protective 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.
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