Alalis pH400 Standard Benchtop pH Meter
| Brand | Alalis |
|---|---|
| Model | pH400 Standard |
| Type | Benchtop pH Meter |
| Measurement Parameters | pH and mV (ORP) |
| pH Range | 0.00–14.00 pH |
| pH Resolution | 0.01 / 0.1 pH |
| pH Accuracy | ±0.01 pH |
| mV Range | ±1999 mV |
| mV Resolution | 1 mV |
| mV Accuracy | ±0.1% FS |
| Temperature Range | 0.0–100.0 °C |
| Temperature Resolution | 0.1 °C |
| Temperature Accuracy | ±0.5 °C |
| Calibration | 1–3 point automatic pH calibration with CH and USA buffer series (6 total standard buffers) |
| Temperature Compensation | Automatic or manual (0–100 °C) |
| Data Storage | 200 sets with min/max recall |
| Interface | RS-232 with PC communication software |
| Display | 80 × 58 mm LCD, large-font, backlit |
| Enclosure Rating | IP54 |
| Default Electrode | Plastic-body tri-combination pH electrode |
| Power | 9 V DC adapter |
Overview
The Alalis pH400 Standard Benchtop pH Meter is a precision electrochemical instrument engineered for reliable, repeatable measurement of hydrogen ion activity in aqueous solutions. Based on the potentiometric principle—measuring the potential difference between a pH-sensitive glass electrode and a stable reference electrode—the pH400 delivers traceable, NIST-traceable-compatible readings across the full physicochemical pH scale (0.00–14.00). Its dual-parameter capability extends functionality to redox potential (ORP/mV) measurements, enabling comprehensive aqueous phase characterization in regulated and non-regulated environments. Designed for laboratory, quality control, and process support roles, the instrument meets foundational requirements for method validation under ISO/IEC 17025, USP , and EPA Method 150.1, supporting routine compliance in food safety (HACCP, QS), environmental monitoring (wastewater, drinking water), pharmaceutical manufacturing, and bioprocess development.
Key Features
- Automatic 1–3 point pH calibration with intelligent step-by-step guidance and real-time status feedback
- Integrated self-diagnostic system that identifies electrode response anomalies, slope deviation, and junction impedance issues
- Selectable resolution modes: 0.01 pH (high-precision mode) or 0.1 pH (rapid screening mode)
- Universal buffer compatibility—supports both CH (Chinese national standard) and USA (NIST-traceable) buffer series, totaling six certified calibration points (pH 1.68, 4.01, 6.86, 7.00, 9.18, 10.01)
- Stable endpoint detection algorithm minimizes drift-related uncertainty and optimizes measurement repeatability
- Large-format 80 × 58 mm monochrome LCD with high-contrast, anti-glare display and adjustable backlighting for ergonomic viewing under varied lighting conditions
- Comprehensive temperature compensation: automatic (with integrated ATC probe input) or manual entry across 0.0–100.0 °C
- Onboard data logging for up to 200 measurement records, including timestamp, pH/mV value, temperature, and calibration history; supports min/max value tracking per session
- RS-232 serial interface compliant with EIA/TIA-232-E standards, bundled with Windows-compatible communication software for data export, audit trail generation, and report formatting
- Dual temperature units (°C/°F) and one-touch factory reset function for rapid configuration recovery
- IP54-rated enclosure with sealed electrode ports and rubber protective caps to resist dust ingress and incidental splashes during daily lab use
Sample Compatibility & Compliance
The pH400 is validated for use with standard aqueous samples—including buffered solutions, fermentation broths, wastewater effluents, pharmaceutical formulations, and potable water matrices. It accommodates conventional glass-body and robust plastic-body combination electrodes (e.g., the included tri-combination pH electrode), with optional compatibility for specialized ORP, low-ionic-strength, or high-temperature electrodes via standard BNC and mini-DIN connectors. The instrument conforms to IEC 61010-1:2010 for electrical safety in laboratory equipment and supports GLP/GMP-aligned workflows through secure data handling, user-accessible calibration logs, and software-enabled electronic signatures (when paired with compliant PC applications). While not inherently 21 CFR Part 11–certified, its data export architecture enables integration into validated LIMS or ELN systems meeting FDA regulatory expectations.
Software & Data Management
The supplied RS-232 communication software provides bidirectional control: users can initiate measurements remotely, download stored datasets in CSV or TXT format, annotate entries with sample IDs and operator names, and generate time-stamped calibration reports. All exported files include metadata such as instrument ID, firmware version, calibration date/time, electrode serial number (if entered manually), and environmental temperature. Audit trail integrity is preserved via immutable timestamps and sequential record indexing—critical for internal QA reviews and external accreditation audits (e.g., CNAS, UKAS). Software updates are distributed via Alalis’ official technical support portal, ensuring continued compatibility with modern Windows OS versions (Windows 10/11, 64-bit).
Applications
- Environmental laboratories performing routine pH analysis per ASTM D1293 (Standard Test Method for pH of Water) and ISO 10523 (Water Quality — Determination of pH)
- Food & beverage QC labs verifying acidity in dairy products, beverages, and canned goods per Codex Alimentarius guidelines
- Pharmaceutical facilities conducting pH verification of purified water (PW), water for injection (WFI), and buffer solutions per USP
- Biotechnology and fermentation units monitoring culture medium pH stability during upstream processing
- Academic research labs requiring stable, low-drift measurements for kinetic studies, titration endpoints, or equilibrium constant determinations
- Municipal water treatment plants performing daily compliance checks against WHO and local regulatory limits (e.g., pH 6.5–8.5 for potable water)
FAQ
What calibration buffers are supported?
The pH400 accepts six standardized buffer solutions: pH 1.68, 4.01, 6.86, 7.00, 9.18, and 10.01—covering both CH (GB/T 27501) and USA (NIST SRM) certification series.
Does the instrument support automatic temperature compensation (ATC)?
Yes—when connected to a compatible ATC probe (e.g., Pt1000 or thermistor-based), the pH400 performs real-time temperature correction using the standard Nernst equation slope adjustment.
Can the pH400 measure redox potential (ORP)?
Yes—it measures mV values from −1999 to +1999 mV with 1 mV resolution and ±0.1% full-scale accuracy, suitable for standard hydrogen electrode (SHE)-referenced ORP assessments.
Is the data storage function password-protected?
No—the 200-record memory is accessible without authentication; however, exported data files retain full contextual metadata required for traceability in regulated settings.
What is the warranty coverage and service support structure?
Alalis provides a 24-month limited warranty covering parts and labor; extended calibration and preventive maintenance contracts are available through authorized service centers in APAC and EMEA regions.
