Apera Instruments LabSen 831 User manual
LabSen® 831 pH Electrode
User Manual
Storage bottle
Storage bottle cap
Rubber plug on the
refilling hole
BNC connector
Measuring tip
Built with proprietary sensor technology and premium materials from Switzerland, Apera LabSen®
831 HF pH Electrode is designed for professional pH measurement of solutions containing HF
(Hydrofluoric) acid, and other strong acid solutions.
Features(
• Built with LabSen HF glass membrane designed for precise measurement in strong acid
solutions, and is resistant to hydrofluoric corrosion (1g/L).
• No more air bubbles inside the glass membrane thanks to the Swiss blue gel electrolyte.
• The silver ion trap reference system significantly increases measuring stability and extends
service life.
Technical(Specifications(
Measuring Range
0 – 11 pH
Temp e r at u r e R a n ge
0 – 100°C
Membrane Type
HF
Body Material
Lead-free Glass
Reference
Silver ion trap
Junction
Ceramic
Reference Solution
3M KCL
Soaking Solution
3M KCL
Membrane Resistance
< 400MΩ
Electrode Dimension
(Φ12×120) mm
Connector
BNC
Cable
Φ3×1m
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. Measurement suggestions for HF-containing solutions:
5.1. Use a PTFE container while testing solutions containing hydrofluoric acid.
5.2. The electrode can measure HF solution less than 0.1mol/L (pH≈2.1) within 3 minutes each time.
5.3. When measuring HF solution around 0.5mol/L (pH≈1.8), after a long test, if the membrane is
obviously dissolved, the service life will be shortened. Our recommendation is to avoid such tests or
test faster, less than 2 minutes each time.
5.4. The electrode is not suitable to measure HF solution more than 0.5mol/L (pH＜1.8), which will cause
the electrode to perform at a poorer level or even be damaged.
5.5. After a while of usage, potential drift and slow response may occur to the electrode. Please re-
calibrate after soaking it in 3M KCL for more than half an hour. Stirring is recommended while
measuring to speed up stable measurement.
6. After using, put the electrode back into the storage bottle, twist on the bottle cap, and plug in the refilling
hole.
Maintenance(
1. When not in use, the electrode should be soaked in the storage bottle containing 3M KCL soaking solution
(SKU: AI1107) 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 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 (SKU: AI1107) to the refilling hole (unplug the blue rubber plug)
using a syringe or pipette.
3. 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.
4. 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 solution (SKU: AI1107)
for at least 1 hour. Rinse it off, then re-calibrate it before using again.
5. 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.
6. The electrode should avoid testing strong alkaline 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.
7. 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 performance.
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. Fill out the form and 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: 1-614-285-3080
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