Apera Instruments LabSen 241-3 User manual

LabSen® 241-3 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® 241-3 Micro pH electrode is designed for high-accuracy pH measurement of
micro-volume samples in small containers such as test tubes, microplates, and centrifuge tubes.
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 S membrane ensures low impedance 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.
Technical Specifications
Measuring Range
0-14 pH
Reference Solution
3M KCL
Temperature Range
0~100°C
Soaking Solution
3M KCL
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

How to use
1. Connect the electrode to the BNC connector of your pH meter.
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 3M KCL 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.
Maintenance
1. When not in use, the electrode should be soaked in the storage bottle containing 3M KCL soaking 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. For tough contaminants, soak the electrode in Apera cleaning solution (AI1166) for 30 minutes. Then use
a soft brush to remove the contaminants. Afterwards, soak the electrode in 3M KCL soaking solution for at
least 1 hour. Rinse it off, then re-calibrate it before using again.
4. 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.
5. 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.
6. 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.

Warranty
We warrant this electrode to be free from defects in material and workmanship and agree to repair or replace
free of charge, at option of APERA INSTRUMENTS, LLC, any malfunctioned or damaged product attributable
to responsibility of APERA INSTRUMENTS, LLC for a period of SIX MONTHS from the delivery.
This limited warranty does NOT cover any damages due to:
Accidental damage, transportation, storage, improper use, failure to follow the product instructions or to
perform any preventive maintenance, unauthorized repair or modifications, normal wear and tear, or other
external causes or actions beyond our reasonable control.
To get the fastest warranty fulfillment, go to support.aperainst.com and click “New Support Ticket” on the
upper right corner. Type your email in the requester field, “Warranty” in the Subject field, and then input the
following information in the description field:
•Your full name
•Product model that needs warranty fulfillment
•Serial number of the product (can be found on the back sticker of the tester body)
•What problem or issue you had experienced with the product
•Attach a photo of your proof of purchase
•Attach a photo of the problematic product
Then click Submit. One of our customer care specialists will help you fulfill the warranty within one business
day.
APERA INSTRUMENTS, LLC
Address: 6656 Busch Blvd, Columbus, OH 43229 Phone: [phone]
Website: www.aperainst.com Email: [e-mail]