Lab-grade pH measurement in high-temperature and caustic nutrient or process solutions — up to 130°C.
Apera PH700-HT (AI5019) is a dedicated benchtop pH meter built for high-temperature liquids up to 130°C and/or caustic or chemically complex water solutions. Paired with the Swiss-engineered LabSen 865 electrode — featuring a PHY membrane and PTFE anti-clog junction — it delivers ±0.01 pH accuracy where standard electrodes fail.
The Apera PH700-HT (SKU AI5019) is a benchtop lab pH meter purpose-built for sample conditions that destroy conventional electrodes: high-temperature liquids up to 130°C and caustic or corrosive water solutions. It is a variant of Apera's PH700 platform — the same reliable meter body used across laboratories — paired specifically with the Swiss LabSen 865 pH/temperature electrode instead of a standard glass combination probe.
This is not a general-purpose meter with a high-temp upsell. The LabSen 865 uses a PHY glass membrane — the most chemically robust membrane in the LabSen series — and a PTFE junction specifically chosen because it resists clogging from complex or caustic chemical matrices. The meter reads 0–14.00 pH at ±0.01 accuracy with 0.01 pH resolution, and the electrode's built-in 30KΩ NTC thermistor feeds automatic temperature compensation throughout the measurement range.
Most cultivation pH checks happen at ambient temperatures on straightforward water solutions — and a standard benchtop meter handles that fine. The PH700-HT is for the edge cases that matter: verifying nutrient concentrate stock solutions that are stored or mixed warm; testing pH on heated recirculating reservoirs in enclosed environments where temperature drifts well above standard calibration assumptions; or quality-checking input water that passes through heat exchange or sterilization steps before entering the system.
Post-harvest and extraction operations also generate a need for this class of meter. Wash solutions, solvent blends used in cleaning equipment, and caustic sanitizers used in facility maintenance all fall outside the safe operating range of standard electrodes. Having a dedicated meter rated for those conditions means you are not burning through standard probes or, worse, taking readings you cannot trust because the electrode is out of spec.
The LabSen 865 electrode is manufactured with Swiss sensor technology and materials. Its PHY glass membrane is engineered to withstand both high temperature (to 130°C) and caustic chemical environments — conditions that degrade standard lithium glass membranes quickly. The PTFE junction prevents the reference junction from clogging when measuring complex chemical matrices. A Silver Ion Trap reference system maintains a stable reference potential and extends service life compared to standard ceramic junction designs.
On the meter side, the PH700 platform provides 1–3 point automatic calibration with self-diagnosis and electrode condition display, so you know whether your probe slope is still within acceptable range before you rely on a reading. Max/Min reading mode lets you track measurement behavior over a time window — useful for monitoring stability in variable-temperature samples. The meter stores 50 data sets internally. The IP54-rated housing and silicone-sealed connectors make it appropriate for bench environments where spills and chemical vapors are routine.
The AI5019 ships as a complete kit: the PH700-HT meter, the Swiss LabSen 865 pH/temperature electrode, a simple electrode holder rated for up to two electrodes, and three bottles of pre-mixed pH calibration solutions — 4.00, 7.00, and 10.01 — 50 mL each. Everything you need to set up and begin measuring is included; no separate buffer purchase required on day one.
Apera backs the instrument with a two-year manufacturer's warranty. The electrode carries a six-month warranty — standard for consumable sensor components. For commercial facilities running regular pH checks, the electrode is a planned maintenance item; budget for periodic replacement as part of your QC program rather than treating probe longevity as a surprise variable.
| SKU | AI5019 |
| Model | PH700-HT |
| pH Measuring Range | 0–14.00 pH |
| pH Accuracy | ±0.01 pH |
| pH Resolution | 0.01 pH |
| Electrode | Swiss LabSen 865 pH/Temp. (PHY membrane, PTFE junction) |
| Sample Temperature Range | 0–130°C |
| Temperature Sensor | 30KΩ NTC (built-in ATC) |
| Calibration | 1–3 point auto, self-diagnosis, electrode condition display |
| Buffer Standards Recognized | pH 4.00 / 7.00 / 10.01 (pre-mixed buffers included) |
| Data Storage | 50 sets |
| Enclosure Rating | IP54 (spill-proof and dust-proof) |
Standard glass pH electrodes are not rated for temperatures above roughly 60–80°C and will degrade rapidly in caustic or chemically complex solutions. The LabSen 865 uses a PHY glass membrane — Apera's most chemically robust membrane — and a PTFE anti-clog junction specifically for high-temperature and caustic environments up to 130°C. Using a standard probe outside its rated conditions produces unreliable readings and shortens probe life significantly.
Yes. The LabSen 865 electrode is rated across the full 0–130°C range, which includes standard ambient-temperature water solutions. If your operation requires both high-temp and routine checks, the AI5019 covers both without needing a second meter.
During calibration, the PH700-HT reads the electrode slope and displays the result alongside a pass/warn/fail condition indicator. This tells you whether your probe is still performing within acceptable tolerances before you commit to production measurements. It is a built-in QC step that removes guesswork about probe health.
Electrode service life depends heavily on exposure frequency, sample chemistry, and cleaning practices. Apera warrants the electrode for six months. For facilities running daily checks on hot or caustic samples, plan to evaluate electrode condition regularly using the meter's self-diagnosis function and budget for annual or more frequent replacement as part of your QC consumables plan.
Yes, and specifically for any nutrient or process solutions that are heated or caustic — concentrate mixing tanks, warm recirculating reservoir systems, or sanitizing solutions. For straightforward ambient-temperature checks of standard fertigation water, Apera's standard PH700 variants are also available through HSC. The HT variant is the right choice wherever sample temperature or chemical aggressiveness exceeds the limits of a standard electrode.
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