Thermo Fisher Scientific pHTestr 1 - Manual (Page 2)

Waterproof pHTestr 1
Microprocessor-based Pocket pH Tester
68X247716 2/05 Rev 4
MAINTENANCE IS EASY: Rinse the
electrode in tap water after use. In harsh
samples, take readings quickly, rinse electrode
immediately afterwards with tap water to
remove residues and prevent electrode
contamination. To maximize electrode life, place
a small piece of clean cloth or sponge in the
cap, moisten with tap water (NOT DE-IONIZED
WATER), and replace cap.
CHANGING BATTERIES: Twist open the
battery compar tment lid. Remove old
batteries and replace with fresh ones noting
polarity as shown in battery compartment.
Re-calibrate after battery change.
USEFUL NOTE: • To avoid cross contami-
nation, rinse between samples and buffer
with tap water • Calibration should be done
regularly or daily to ensure good tester
accuracy.
ERROR MESSAGES: E1 - Weak batteries.
Need replacement. E2 - Wrong or bad buffer
value (out of range) or the electrode is failing.
OR - Over range signal or electrode is not in
contact with sample solution.
BEFORE USE: DO NOT BE ALARMED if
white crystals form around the cap. This
is normal.
CONDITIONING: Condition the unit before
first use. Remove cap, immerse electrode
in tap water for 1 hour. This activates
electrode and dissolves crystals.
CALIBRATION: Select pH 7 buffer for
general testing or pH 4 or 10 buffer
if you are measuring acidic/basic
samples. Press ON/OFF button to power
on. Immerse electrode in chosen
buffer about 2 cm deep and stir gently.
Wait for displayed value to stabilize
at or near the pH buffer chosen.
Next, press the CAL button to enter
calibration sequence. When dis-
play flashes continuously, press
HOLD/CON button to confirm.
You have successfully calibrated
the instrument.
pH TESTING: • Remove cap
and press ON/OFF button on
the keypad to turn on the
pHTestr 1 • Dip the electrode
about 2 cm into the test solution
• Stir once, let the display
stabilize. Note the pH • Press
HOLD/CON button if you wish
to hold the reading. Press again
to release • Press the ON/OFF
button to shut off • Tester au-
tomatically shuts-off after 8.5
minutes to conserve batteries!
Keypad