Hanna Instruments HI 98108 - Manual (Page 2)

Pull out 2 mm (1/8'') of the cloth
junction to renew the electrode refer-
ence (it is recommended to cut the
cloth leaving always at least 2 mm -
1/8'' over the reference compartment)
and recalibrate the meter.
The cloth junction can be pulled out approximately 20
times. After that, the electrode should be replaced.
ELECTRODE REPLACEMENT
For replacing the electrode, contact your Dealer or the nearest
Hanna Service Center.
BATTERY REPLACEMENT
If calibration can not be performed or the display fades,
batteries must be replaced. Slide off the battery compart-
ment cover and replace all four 1.5V alkaline batteries,
while paying attention to the correct polarity.
Batteries should only be replaced in a non-hazardous area
and using the battery type specified in this instruction
manual.
CONDITIONING
• Remove the cap.
• To activate the electrode, immerse it in HI70300
storage solution for 2 hours.
CALIBRATION
• Immerse the electrode in pH 7.01 (HI7007) buffer
solution.
• Allow the reading to stabilize and
with the supplied screwdriver, ad-
just the “pH7” calibration trimmer
to read “7.0” pH.
• Rinse the electrode with tap water
and immerse it into the second
buffer.
• Use pH 4.01 (HI7004) if the solution to be measured
is acidic (pH < 7), or pH 10.0 (HI7010) for alka-
line samples (pH > 7).
• Allow the reading to stabilize and with the screwdriver
adjust the “pH4/10” calibration trimmer to read “4.0”
or “10.0” pH.
OPERATION
• Remove the protective cap, turn the
pHep ® + on, by sliding the ON/
OFF switch on the top of the meter.
• Immerse it in the solution to be
tested without exceeding the maxi-
mum immersion level.
• Stir gently and wait for the reading
to stabilize.
• After use, switch the meter off, rinse the electrode with
tap water and store it with a few drops of storage
(HI70300) or pH7 (HI7007) solution in the protec-
tive cap. Always replace the protective cap after use.
NEVER USE DISTILLED OR DEIONIZED WATER FOR STOR-
AGE 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.
WARRANTY
This meter is guaranteed for one year against defects in
workmanship and materials when used for their intended
purpose and maintained according to instructions. This war-
ranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of
prescribed maintenance are not covered. If service is re-
quired, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number,
date of purchase, serial number and the nature of the fail-
ure. If the repair is not covered by the warranty, you will be
notified of the charges incurred. If the instrument is to be
returned to Hanna Instruments, first obtain a Returned Goods
Authorization Number from the Customer Service depart-
ment and then send it with shipment costs prepaid. When
shipping any instrument, make sure it is properly packaged
for complete protection.