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A glass spear for semi-solid samples.
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APERA INSTRUMENTS / LABSEN 251 / AI3105
LabSen 251 is a glass-body spear pH electrode for direct testing of semi-solid samples as well as general water solutions. Its spear-shaped S-type membrane pushes into the sample, and its polymer electrolyte means there is nothing to refill. It has a BNC connector.
It reads pH 0 to 14 from 0 to 80°C. Catalog AI3105. 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. Published families link to their product pages. Other models are shown for comparison only; confirm the exact connector and host before choosing.
AI3103 / AI3117 / AI3235
Test tubes, >0.2 mL
Ø6 mm sensing tip; down to 60 µL with a semi-micro container.
AI3104 / AI3151 / AI3161
Microplates, tubes, NMR
Ø3 mm tips for samples from 30 µL; protein and NMR versions.
AI3105
Semi-solids
Spear glass membrane with polymer electrolyte.
AI3106 / AI3113
Soil and soil slurry
PVC spear for direct soil and slurry testing.
AI3157 / AI3201
Cheese, fruit, dough, meat
Food-grade titanium body, Ø6 mm spear tip.
AI3159 / AI3202 / AI3245
Fresh and frozen meat
Titanium blade spear; BNC, BNC/RCA or 8-pin.
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.
Apera states stable readings in 15–30 seconds and a membrane about 10 times stronger than traditional glass.
Resists clogging and needs no refilling.
Glass tube, AgCl and silver wire for a stable reference.
Key figures: pH range 0–14; temperature range 0–80°C; body lead-free glass; glass membrane S-type spear; junction ceramic + single pore; reference electrolyte polymer.
The full specification table is in the Product Specifications tab.
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.
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 251 is a glass-body spear pH electrode for direct testing of semi-solid samples as well as general water solutions.
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.
LabSen 251 (AI3105; BTS-AI3105) uses a BNC pH connection and has no built-in temperature sensor. Use a compatible separate temperature probe for ATC, or manual entry only within the meter’s supported range.
The electrode is rated pH 0–14 and 0–80°C. Those electrode limits do not override the connected meter’s or separate temperature probe’s limits.
Its glass body carries an S-type spear membrane, a ceramic-plus-single-pore junction and non-refillable polymer electrolyte. It is intended for semi-solid samples and general water; it is still a glass sensor, not an unbreakable insertion tool.
Apera lists a 100 mm length and a diameter tapering from 12 to 6 mm. Check the sample vessel and insertion path against those dimensions before selecting this BNC electrode.
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 (AI3105) against your meter and samples, then return to the live price and ordering controls.
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 PDF documents, with model and regional scope stated on each card. Each whole card opens its PDF in a new tab.
Document scope and limits. This is an official multi-model 2021 selection handbook containing LabSen 251, not an exact 251 instruction sheet or a guarantee of interchangeability with another brand. Use the current US 251 specifications on this page for the supplied offer; do not transfer other models’ specifications. Contact Blue Tiger Scientific for the exact supplied electrode instructions.
email us here: info@bluetigerscientific.com or live chat
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