Apera Instruments LabSen 241-3SP User manual

LabSen® 241-3SP Micro pH Electrode
User Manual
Storage bottle
Storage bottle cap
Rubber plug on the
refilling hole
BNC connector
Measuring tip
Stainless steel
protective shaft

LabSen® pH electrodes are made with proprietary sensor technologies and key components from
Switzerland. LabSen® 241-3SP Micro pH electrode is designed for high-accuracy pH measurement
of micro-volume samples containing proteins in small containers such as test tubes, microplates,
cuvettes, and centrifuge tubes.
1. Features
•Unique LabSen® micro cylindrical sensor tip, designed for
micro-volume pH measurement
•Smallest test sample volume is 15µL when you put your
sample solution into Apera micro container (SKU: AI3301, sold
separately)
•The protelyte solution prevents junction clogs from proteins,
ideal for biochemical samples.
•The S membrane ensures low resistance for fast response
•The Long-life reference system significantly increases
measuring stability and extends service life.
•The stainless-steel shaft protects the ultra-slim glass electrode
from accidental damage.
2. Technical Specifications
Measuring Range
0-14 pH
Reference
Solution
Protelyte
Temperature
Range
0~100°C
Soaking Solution
Protelyte
Membrane Type
S
Membrane
Resistance
<450MΩ
Body Material
Lead-free
Glass
Electrode
Dimension
Entire body: (Φ12×130) mm
Measuring end: (Φ3×16/Φ4×54)
mm
Reference
Long Life
Connector
BNC
Junction
Ceramic
Cable
Φ3×1m
Micro Container

3. How to use
1. Insert the blue BNC connector of the electrode to the BNC socket of your pH
meter while twisting clockwise until it’s locked.
2. Before measuring, twist off the storage bottle cap (see graph on the right), pull
out the electrode and rinse it off with distilled or deionized water.
3. Unplug the blue rubber plug to maintain a smooth electrolyte flow.
4. Perform at least a two-point calibration before measuring after connecting the
new electrode to your pH meter.
5. The reference solution will run low as you use the electrode. Whenever the
solution level falls to 1/2 height of the electrode, add Protelyte solution to the refilling hole (unplug
the blue rubber plug) using a syringe or pipette.
6. After using, put the electrode back into the storage bottle and twist on the bottle cap.
4. Maintenance
1. When not in use, the electrode should be soaked in the storage bottle containing Protelyte
solution to keep the glass membrane and junction in a healthy condition. Clean the bottle and
replace the soaking solution if it gets contaminated. The electrode should never be stored in pure
water such as deionized or distilled water.
2. The electrode is only as accurate as it is clean. Always thoroughly rinse off the probe before and
after each measurement with pure water in a container or with a wash bottle.
3. The connector of the electrode should be kept clean and dry. If contaminated, please clean it
with medical cotton and isopropyl alcohol and blow-dry it to prevent short circuit of the electrode
or slow response of the electrode.
4. The electrode should avoid testing strong acid and strong alkali solutions, as well as dehydrating
media such as absolute ethanol and concentrated sulfuric acid. If testing such solutions, the
immersion time should be minimized and the electrode should be carefully cleaned after use.
5. Every pH electrode will eventually age and fail. The typical service life of Apera pH electrodes is
12-24 months depending on the frequency of usage and how well you keep it clean and properly
stored. We recommend replacing your electrode every 12-18 months to ensure the best accuracy.

5. Limited Warranty
We warrant this electrode 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 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:
I. transportation;
II. storage;
III. improper use;
IV. failure to follow the product instructions or to perform any preventive maintenance;
V. modifications;
VI. combination or use with any products, materials, processes, systems or other matter not provided or authorized
in writing by us;
VII. unauthorized repair;
VIII. normal wear and tear; or
IX. external causes such as accidents, abuse, or other actions or events beyond our reasonable control.
APERA INSTRUMENTS (Europe) GmbH
Wilhelm-Muthmann-Str. 18
42329 Wuppertal Germany
Tel.: [phone]
Email: [e-mail]
www.aperainst.de