Apera Instruments LabSen 551 User manual

LabSen 551 Spear pH Electrode
User Manual
LabSen electrochemical sensors are premium pH electrode with manufacturing technology and key
components imported from Switzerland. LabSen551 spear pH electrode adopts spear membrane,
which can easily pierce into solid or semi-solid medium. This probe is suitable for pH measuring of
fruits, vegetable and soil.
This probe has following features:
Solid PVC housing, offers stronger protection.
Blue gel inner solution, does not flow and will not cause bubble.
Maintenance-free polymer electrolyte, non-diaphragm structure.
Long life reference system, has better stability and service life.
1 Technical Data
Measuring Range
(0 ~ 14) pH
Electrolyte
Polymer
Temperature Range
(0 ~ 80) °C
Soaking
Solution
3M KCl
Shaft Material
PVC Plastic
Electrode
Dimension
Electrode (Ø15×90) mm
Measuring Tip (Ø6×25) mm
Membrane Shape
Tapered
Reference
Long Life
Connector
BNC
Junction
Ceramic+Single Pore
Cable
Ø3×1m
2 Usage and Maintenance
2.1 Connect BNC plug to the input on the pH meter.
2.2 Pull off the rubber cover. Set them aside (DO NOT pour out the KCl solution). Rinse the
electrode with distilled water. Put the electrode back in the rubber cover after use.
2.3 After long time exposure in air, Polymer electrolyte will cause shrinkage. It will not happen in
measurement status. The electrode must be soaked in 3M KCl solution for storage. After long
time soaking, there will be some floccules dissolving out from 3M KCl solution, this is normal
phenomenon.
2.4 The electrode’s measuring tip should be soaked in the soaking cover containing certain
amount of storage solution to keep the membrane hydrated and junction unblocked. Clean the
cover and replace the storage solution if the storage solution gets turbid and mildewed. The
electrode should never be sinked in pure water or buffer solution for long.
2.5 The connector of the electrode should keep clean and dry. If being contaminated, please clean
it with medical cotton and absolute alcohol and blow dry to prevent the short circuit of the
electrode and slow reaction of electrode.
2.6 Spear pH Electrode is suitable for measure wet solid or semi-solid medium. Please forcibly

even when piercing, to prevent damage of the electrode. In case, the sample medium is too
hard (such as meat and fruit). Please cut a small hole before piercing the electrode into it.
2.7 After 1-year of use, we recommend replacing the electrode to ensure the best accuracy.
3 Warranty
We warrant this electrode free from defects in material and workmanship and agrees to repair or
replace free of charge, at option of APERA INSTRUMENTS any malfunctioned or damaged product
attributable to responsibility of APERA INSTRUMENTS for a period of six months. 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.
This limited warranty does not cover any damages due to:
transportation; storage; improper use; failure to follow the product instructions or to perform any
preventive maintenance; modifications; combination or use with any products, materials, processes,
systems or other matter not provided or authorized in writing by us; unauthorized repair; normal wear
and tear; or external causes such as accidents, abuse, or other actions or events beyond our
reasonable control.
APERA INSTRUMENTS (Europe) GmbH
Address: Wilhelm-Muthmann-Str.15,
42329 Wuppertal, Germany
Phone: [phone]
Website: www.aperainst.de
Email: [e-mail]