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A titanium spear for solid foods.
APERA INSTRUMENTS / LABSEN 751 · 753 / AI3157 / AI3201
LabSen 751 and 753 have a food-grade titanium body and a Ø6 × 50 mm spear tip for direct pH measurement of cheese, fruit, dough, sushi rice and meat products. An open-and-ceramic double junction with polymer electrolyte reduces clogging and needs no refilling. The 751 has a BNC connector; the 753 adds a built-in temperature sensor with an RCA plug.
It reads pH 0 to 14 from 0 to 80°C. Choose the version that matches your meter’s connector from the menu above. 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.
BNC versions plug into any pH meter with a BNC input. They have no temperature sensor, so pair them 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.
BNC/RCA versions carry a built-in 30 kΩ NTC temperature sensor on an RCA plug for automatic temperature compensation on Apera meters with BNC and RCA inputs, such as the PH700, PH850, PH8500, PH820, PH910 and PH9500. Apera notes they may not work with other brands’ meters because the thermistor might not be compatible.
Ø12 × 115 mm body with a Ø6 × 50 mm measuring tip.
Low resistance and high firmness; Apera states 15–30 second stabilization.
Polymer electrolyte reduces clogging and needs no refilling.
All versions share: pH range 0–14; temperature range 0–80°C; body food-grade titanium; glass membrane S-type spear; junction ceramic + open; 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.
The 751 and 753 are sealed and need no refilling.
Apera’s manual advises avoiding strong acids, strong alkalis 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.
Apera ships this electrode in these kits: PH8500-SS (LabSen 753), PH850-SS (LabSen 753).
Calibrate with fresh pH 7.00, pH 4.00 and pH 10.01 buffers.
LabSen 751 and 753 have a food-grade titanium body and a Ø6 × 50 mm spear tip for direct pH measurement of cheese, fruit, dough, sushi rice and meat products.
LabSen 751 (AI3157; BTS-AI3157) provides BNC pH without a temperature sensor. LabSen 753 (AI3201; BTS-AI3201) adds a 30 kΩ NTC temperature sensor on RCA for a compatible Apera meter; do not assume another brand’s RCA input supports it.
The pH signal is standard BNC, but Apera notes the temperature thermistor may not be compatible with other brands’ meters. Use it on Apera meters with BNC and RCA inputs.
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.
Both have a food-grade titanium body listed as Ø12 × 115 mm and a Ø6 × 50 mm measuring tip. They are spear electrodes for cheese, fruit, dough, sushi rice and meat products, not the 761/763/765 titanium-blade family.
Both are rated pH 0–14 and 0–80°C with a 1 m cable. Respect the connected meter’s and temperature probe’s limits as well; the electrode rating does not expand them.
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 version, connector and catalog number (AI3157 / AI3201) 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 documents are labeled by model and scope below. Each whole card opens a PDF in a new tab.
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