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Glass-body pH for dirty samples. No refilling.
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APERA INSTRUMENTS / LABSEN 231 / AI3111
LabSen 231 is a non-refillable glass-body pH electrode for wastewater, suspensions, emulsions and other complex solutions that tend to clog the junction of a regular electrode. It combines an open junction with polymer electrolyte and connects to any pH meter with a BNC input.
It reads pH 0 to 14; use 0 to 80°C as the provisional common operating envelope pending manufacturer clarification. Catalog AI3111. Apera warrants LabSen electrodes for six months from delivery.
Only published products are linked. Other cards provide model-comparison information and do not indicate current storefront availability.
Start with your sample. Each card opens an electrode family; on that page, pick BNC, BNC/RCA pH/temperature or 8-pin to match your meter.
AI3101 / AI3121
General water, TRIS buffers
Refillable everyday glass electrode; BNC or BNC/RCA pH/temp.
AI3102 / AI3123
Titration, low ionic strength
Movable sleeve junction: easy to clean, adjustable flow.
AI3111
Wastewater, suspensions
Glass body, open junction and polymer electrolyte.
AI3131 / AI3133 / AI3231
Wastewater, harsh environments
Corrosion-resistant POM body, open junction; BNC, BNC/RCA or 8-pin.
AI3107 / AI3172
Skin, textiles, paper, leather
Flat glass membrane and PTFE ring junction.
AI3108 / AI3137 / AI3233
Pure, DI and RO water
L-type low-resistance glass (<50 MΩ) for low-ionic water.
AI3149
Cold samples to −25°C
L-type conical glass and Protelyte for −25 to 80°C.
It plugs into any pH meter with a BNC input. It has no temperature sensor, so pair it with a separate temperature probe such as Apera’s MP500 where compatible with the meter, for automatic temperature compensation; manual temperature entry is an option only if the meter supports it at the sample temperature. Electrode ratings do not extend the meter’s or separate temperature probe’s operating or compensation limits.
No ceramic pores for solids and oils to block, and no electrolyte to refill.
Low resistance and high firmness; Apera states stable readings in 15–30 seconds.
Glass-tube Ag/AgCl reference for stability and service life, with blue gel inner electrolyte.
Key figures: pH range 0–14; temperature range 0–80°C (provisional common operating envelope); body lead-free glass; glass membrane S-type, half-ball; junction open; reference electrolyte polymer.
The full specification table is in the Product Specifications tab.
Temperature-source notice: Apera’s current US LabSen 231 page lists 0–100°C, but its linked v2.0 manual specifies −5–80°C. This offer is conservatively limited to their common 0–80°C interval. Do not use the page’s 100°C limit or the manual’s −5°C minimum without written confirmation for the supplied revision.
Keep the tip in its cap with 3M KCl storage solution whenever it is not measuring.
Never store a pH electrode in pure, deionized or distilled water.
It is sealed and needs no refilling.
Apera’s manual advises avoiding strong acid and strong alkali solutions and dehydrating media such as absolute ethanol or concentrated sulfuric acid; if exposure is unavoidable, keep immersion short and clean the electrode carefully afterward.
Rinse with distilled or deionized water between samples. For stubborn deposits, use Apera electrode cleaning solution, then recondition and recalibrate.
Calibrate with fresh pH 7.00, pH 4.00 and pH 10.01 buffers.
LabSen 231 is a non-refillable glass-body pH electrode for wastewater, suspensions, emulsions and other complex solutions that tend to clog the junction of a regular electrode.
No; it is sealed and needs no refilling.
Keep the tip in its cap with 3M KCl storage solution whenever it is not measuring. Never use pure, deionized or distilled water.
Not on the basis of the conflicting documents alone. The current US page says 0–100°C, while the exact v2.0 manual says −5–80°C. Use only the common 0–80°C envelope until Apera confirms the supplied revision.
LabSen 231 (AI3111; BTS-AI3111) is BNC and has no temperature sensor. ATC needs a compatible separate sensor and meter; manual entry is usable only within the host’s supported compensation range.
The LabSen 231 combines an open junction with polymer electrolyte to reduce the clogging associated with dirty samples. The polymer reference is sealed and non-refillable; it still needs cleaning and wet storage.
The exact manual advises avoiding strong acids, strong alkalis and dehydrating media such as absolute ethanol or concentrated sulfuric acid. If exposure is unavoidable, keep it brief and clean carefully afterward; this is not a chemical-resistance guarantee.
Apera warrants LabSen electrodes against defects in material and workmanship for six months from delivery. Accidental damage, improper use and normal wear are excluded.
Check the connector and catalog number (AI3111) against your meter and samples, then return to the live price and ordering controls.
Operating scope and qualification: 0–80°C provisional common operating envelope. Current US page: 0–100°C; linked v2.0 manual: −5–80°C. Outside 0–80°C requires manufacturer confirmation for the supplied revision.
APERA INSTRUMENTS, LLC warrants LabSen electrodes to be free from defects in material and workmanship for SIX MONTHS from the delivery.
This limited warranty does NOT cover accidental damage, improper use, normal wear and tear, transportation, storage, failure to follow the product instructions, unauthorized maintenance, modification or repair, or external causes beyond Apera's reasonable control.
Official Apera documents are labeled by model and scope below. Each whole card opens a PDF in a new tab.
Document scope and limits. Temperature-source notice: Apera’s current US LabSen 231 page lists 0–100°C, but its linked v2.0 manual specifies −5–80°C. This offer is conservatively limited to their common 0–80°C interval. Do not use the page’s 100°C limit or the manual’s −5°C minimum without written confirmation for the supplied revision.
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