Leici PH-30P Portable Pen-Style pH/mV/Temperature Meter

Overview

The Leici PH-30P is a compact, rugged pen-style electrochemical meter engineered for field-deployable and routine laboratory pH, mV, and temperature measurements. Based on potentiometric measurement principles—utilizing a glass electrode sensing element and reference junction—the instrument delivers high reproducibility in aqueous and semi-aqueous environments across an extended pH range of −2.00 to 16.00. Its design conforms to fundamental electrochemical metrology standards, including Nernstian response validation and stable junction potential maintenance. The integrated ATC (Automatic Temperature Compensation) system operates within 0.0–60.0 °C, applying the standardized temperature coefficient (−0.305 mV/pH/°C at 25 °C) to correct electrode slope deviations in real time. Unlike benchtop meters, the PH-30P prioritizes portability without compromising traceable accuracy—making it suitable for environmental monitoring, aquaculture, food safety spot checks, educational labs, and QC sampling in manufacturing facilities where rapid, on-site verification is required.

Key Features

• IP67-rated housing ensures full dust ingress protection and immersion resistance up to 1 m for 30 minutes—validated per IEC 60529—ideal for humid, outdoor, or splash-prone environments.
• Modular replaceable pH sensor tip: Three interchangeable electrode configurations available—spherical bulb (standard), flat-surface (for gels, pastes, and surface pH), and conical tip (for semi-solid or viscous samples)—extending service life and minimizing total cost of ownership.
• High-contrast LCD with user-adjustable backlight enables clear readability under low-light conditions, including field use at dawn/dusk or in shaded industrial settings.
• Intelligent auto-calibration logic recognizes GB (China National Standard) and US (NIST-traceable) buffer solutions (pH 4.01, 7.00, 10.01) without manual input—reducing operator error during 1-, 2-, or 3-point calibration routines.
• Configurable auto-hold function supports both timed (5–20 s) and manual data capture modes, ensuring stable readings are recorded even during handheld operation on uneven terrain or moving platforms.
• Energy-efficient power architecture delivers >200 hours of continuous operation on four AAA alkaline cells, with low-battery indicator and programmable auto-shutdown (1–60 min) to prevent inadvertent discharge.

Sample Compatibility & Compliance

The PH-30P is validated for use with aqueous solutions, buffered standards, tap water, wastewater effluents, nutrient solutions, beverage samples, and non-corrosive process streams. It is not intended for strong oxidizers, hydrofluoric acid, or organic solvents that may degrade the glass membrane or reference junction. Electrode compatibility adheres to ISO 3696 (Grade 3 water), ASTM D1293 (pH of water), and GB/T 6920–1986 (water quality—pH determination). While not FDA 21 CFR Part 11 compliant by default (lacking audit trail or electronic signature capabilities), its calibration records—including date/time stamp, buffer IDs, slope (%), and offset (mV)—can be manually documented to support GLP-aligned workflows in non-regulated QA/QC environments.

Software & Data Management

The PH-30P operates as a standalone instrument with no embedded Bluetooth, USB, or PC connectivity. All measurement data remain on-device only; no internal memory or export functionality is provided. This design enhances reliability in electromagnetically noisy industrial zones and eliminates firmware update dependencies. Users are expected to transcribe results manually or integrate readings into LIMS via external logging protocols. Calibration history must be maintained externally per ISO/IEC 17025 Clause 6.4.6 (equipment verification records), including electrode lot numbers, buffer certification details, and ambient temperature at time of calibration.

Applications

• Environmental field testing: Surface water, groundwater, stormwater runoff, and soil leachate pH screening per EPA Method 9040C.
• Aquaculture and hydroponics: Daily monitoring of pond, tank, or reservoir pH to maintain optimal biological activity and nutrient availability.
• Food & beverage production: Spot-checking rinse water, brine solutions, marinades, and post-rinse surfaces to verify sanitation compliance.
• Academic laboratories: Undergraduate electrochemistry experiments involving buffer characterization, titration endpoint estimation, and electrode response kinetics.
• Facility maintenance: Verification of boiler feedwater, cooling tower chemistry, and cleaning solution neutrality prior to equipment contact.

FAQ

What calibration buffers are supported?
The PH-30P auto-recognizes GB-standard buffers (pH 4.00, 6.86, 9.18 at 25 °C) and US/NIST-traceable buffers (pH 4.01, 7.00, 10.01 at 25 °C). Manual buffer selection is not required.
Can the electrode be replaced independently?
Yes—the sensing module is modular and field-replaceable. Three tip geometries (spherical, flat, conical) are available as service parts, eliminating the need to discard the entire meter upon electrode degradation.
Is temperature measurement traceable to national standards?
The integrated thermistor complies with IEC 60751 Class B tolerances over 0–60 °C. For metrological traceability, users should cross-validate against a certified reference thermometer before critical measurements.
Does the device meet any international safety certifications?
The PH-30P carries CE marking per EMC Directive 2014/30/EU and RoHS 2011/65/EU. No ATEX, IECEx, or UL hazardous location certification is applicable due to its non-intrinsically safe design.
How often should calibration be performed?
Calibration frequency depends on application stringency. For routine field use, daily 2-point calibration is recommended. In stable lab environments with low sample variability, calibration every 8 hours or before each batch is acceptable per ISO 17025 guidance.