Thermo Fisher Scientific pHTestr 1 User Manual

Instruction Sheet

Microprocessor based,

pH Tester 1

that floats!

Waterproof pHTestr 1 Microprocessor-based Pocket pH Tester

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!

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.

Keypad

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.

68X247716 2/05 Rev 4

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