4. Notes
1) The tester should be calibrated at least once in a week. Calibrate one point with pH 7.00 buffer solution
for tests requiring general accuracy (>=0.1pH). Calibrate two points with pH 7.00 and pH 4.00 buffer
solutions for tests of acidic solutions (measurement value is less than pH7.00). Calibrate two points with
pH7.00 and pH 10.01 buffer solutions for tests of alkaline solutions (measurement value is more than pH
7.00). If the measurement range is broad, calibrate three points with pH 7.00, pH 4.00 and pH 10.01. To
ensure the reliability of calibration, pH standard buffer solutions should be replaced after 10-15 times of
calibration.
2) Maintenance is necessary for the head of the probe because it can become contaminated after long-term
use. To perform the maintenance, rinse the probe head in soap water and clean it with a soft brush. Then
Rinse the bulb with distilled water, and perform calibration again after several hours.
3) The typical service life of the pH electrode is about 12-18 months. When the icon “Err” appears on the
screen, or the accuracy or response speed cannot meet your demand, please replace a new probe. The
replacement probe’s model number is SX625. Please go to support.aperainst.com to watch a tutorial video
for how to replace the pH probe.
4) The instrument will turn off automatically after 10 minutes if no operation.
5) Replace the batteries when appears on screen.
5. Warranty
We warrant this instrument to be free from defects in material and workmanship and agrees to repair or
replace free of charge, at option of APERA INSTRUMENTS (Europe) GmbH, any malfunctioned or
damaged product attributable to responsibility of APERA INSTRUMENTS (Europe) GmbH for a period of
two years from the delivery (a six-month limited warranty applies to electrodes). Warranty period is the
time limit to provide free service for the products purchased by customers, not the service life of the tester
or electrodes.
APERA INSTRUMENTS (Europe) GmbH
Wilhelm-Muthmann-Straße 15
42329 Wuppertal, Germany
Contact: info@aperainst.de
Website: www.aperainst.de
Tel. +49 202 51988998
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