Apera Instruments LabSen 821 User manual
LabSen® 821 pH Electrode
User Manual
Storage bottle
Storage bottle cap
Rubber plug on the
refilling hole
BNC connector
Measuring tip
Backed by proprietary sensor technologies and premium materials from Switzerland, Apera LabSen
821 pH Electrode is designed for professional pH measurement of milk, cream, yogurt, sauces, and
other liquids containing proteins.
Features(
• Proprietary pH sensor technology and premium materials from Switzerland
• Designed for milk, yogurt, cream, sauces, and other liquids containing proteins
• The silver Ion Trap Reference System + Protelyte reference solution, minimizing junction clogs
by proteins
• Built with LabSen S-type hemispherical glass membrane, featuring fast response and high
firmness
• The blue gel electrolyte eliminating the chance of any air bubbles inside the sensor
• Lead-free glass body
Technical(Specifications(
Measuring Range
0 - 14 pH
Temp e r a t u r e Range
-5 – 100 °C
Membrane Type
S
Body Material
Lead-free glass
Reference
Silver ion trap
Junction
Ceramic*3
Reference Solution
3M KCL
Soaking Solution
Protelyte
Membrane Resistance
<200 MΩ
Electrode Dimension
(Φ12×120) mm
Connector
BNC
Cable
Φ3×1m
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. 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 Protelyte solution
(SKU: AI1190) 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 Protelyte solution (SKU: AI1190) 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 Protelyte solution
(SKU: AI1190) 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 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.
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. 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: 1-614-285-3080
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