APERA INSTRUMENTS / LABSEN 861 · 863 · 865 / AI3167 / AI3176 / AI3241

Hot, caustic, electroplating baths.
Electrode rated to 130°C; host limits apply.

LabSen 861, 863 and 865 are non-refillable pH electrodes for corrosive and high-temperature solutions up to 130°C, such as electroplating solutions. They pair a PHY glass membrane with a PTFE ring junction that resists clogging from complex chemicals. The 861 has a BNC connector, the 863 adds a built-in temperature sensor with an RCA plug, and the 865 is the 8-pin pH/temperature version for PH60 and PH60Z testers fitted with the required 8-pin socket/adapter.

Listed operating envelope: pH 1–13 as a conservative common range; electrode/sample temperature 0–130°C, subject to the host meter’s temperature and compensation limits. Choose the version that matches your meter’s connection and temperature requirements from the menu above. Apera warrants LabSen electrodes for six months from delivery.

BNC versions connect to the pH input of BNC pH meters. They have no temperature sensor: use a separate temperature probe supported by the host meter (Apera’s MP500 only where the meter supports it), or manual temperature entry where available.

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.

The 8-pin version is a pH/temperature electrode for Apera meters with an 8-pin socket, including the PH60, PH60-Z, PH400, PH400S and the PC400, PC400S, SX736 and SX751. PH60 and PH60Z require the appropriate installed 8-pin socket/adapter; this cabled electrode does not replace the native tester probe directly. Confirm the adapter separately; its inclusion is not implied.

Temperature figures are electrode/sample ratings, not a complete-system rating. Use a meter and temperature-compensation method rated for the actual sample temperature; keep the meter body, cable connection and adapter within their own confirmed limits. Connector fit alone does not establish temperature or ATC compatibility.

Check the specifications.

Operating envelope: pH 1–13 as a conservative common range; electrode/sample temperature 0–130°C, subject to the host meter’s temperature and compensation limits. Common construction: body lead-free glass; glass membrane PHY, cylindrical; reference electrolyte gel KCl.

Junction: 861 PTFE ring; 863 PTFE ring; 865 PTFE.

The full specification table is in the Product Specifications tab. pH 1–13 is the conservative common range across the reviewed documents. The 865 PTFE junction, gel KCl and 130°C electrode limit follow its current standalone page; its PH60Z-HT kit table gives conflicting construction and higher temperature values, which are not adopted here. Even the PH8500-HT meter lists compensation/display only to 100°C: an electrode rating does not validate a 130°C meter system.

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 861, 863 and 865 are sealed and need no refilling.

Apera presents these electrodes for caustic and hot sample measurements, but its 861/863 care instructions also caution against strong acid, strong alkali and dehydrating media such as absolute ethanol or concentrated sulfuric acid. Do not interpret the application label as unrestricted chemical resistance or permission for prolonged immersion/storage in the sample. Confirm demanding caustic chemistry with Apera, minimize exposure and clean afterward. High-temperature testing accelerates electrode aging; keep measurement time as short as practical.

Rinse with distilled or deionized water between samples. For stubborn deposits, use Apera electrode cleaning solution, then recondition and recalibrate.