TimePower TP111 Online pH Meter and Temperature Analyzer

Overview

The TimePower TP111 Online pH Meter and Temperature Analyzer is a microprocessor-based industrial process analyzer engineered for continuous, high-stability measurement of aqueous solution acidity (pH) and temperature in real time. It operates on the principle of potentiometric measurement using a glass electrode and reference electrode assembly—typically configured as a three-in-one composite sensor—to detect the hydrogen ion activity relative to a stable reference potential. The instrument integrates a high-input-impedance amplifier (>1×10¹² Ω) to minimize loading errors from high-resistance electrodes, ensuring signal integrity across diverse sample matrices including potable water, wastewater, boiler feedwater, chemical process streams, and pharmaceutical rinse solutions. Designed for 24/7 operation in demanding environments, the TP111 features galvanically isolated analog outputs, dual programmable relay alarms, and robust electromagnetic compatibility (EMC) performance achieved through surface-mount technology (SMT) PCB layout and high-density isolation circuitry.

Key Features

• Backlit 128×64 dot-matrix LCD with intuitive bilingual (English/Chinese) menu navigation—enabling rapid configuration without external software
• Auto- and manual temperature compensation using integrated Pt1000 sensor (0.0–99.9 °C), supporting compensation ranges from 0.1–60.0 °C to align with ASTM D1293 and ISO 10523 standards
• Selectable current output signals (0–10 mA, 0–20 mA, or 4–20 mA) compliant with IEC 60381-1 for seamless integration into DCS, PLC, and SCADA systems
• Dual independently configurable SPST relays (AC220 V/3 A or DC30 V/3 A) for high/low pH alarms, pump control, or dosing activation
• Non-volatile memory retaining calibration data, alarm thresholds, and system settings for >10 years—even during power loss
• IP65-rated NEMA-type enclosure suitable for indoor panel mounting or wall installation in humid or dust-prone industrial zones
• Modular electrode interface supporting multiple physical configurations: flow-through cells, submersible housings, flanged assemblies, and threaded pipe mounts

Sample Compatibility & Compliance

The TP111 accommodates a broad spectrum of aqueous media via application-specific electrode variants—including low-conductivity pure water sensors (model 111-001), general-purpose aqueous electrodes (111-002), fouling-resistant units for wastewater (111-003), high-temperature probes up to 130 °C (111-004), planar-surface electrodes for flat or viscous samples (111-005), and double-junction electrodes for aggressive or sulfide-rich effluents (111-006). All configurations maintain compliance with key metrological and safety frameworks: IEC 61000-4 (EMC immunity), IEC 61010-1 (electrical safety), and RoHS Directive 2011/65/EU. While not intrinsically safe, the unit may be deployed in non-hazardous classified areas per NEC Class I, Division 2 when installed per manufacturer guidelines. Calibration traceability follows NIST-traceable pH buffer standards (pH 4.00, 6.86, 9.18 at 25 °C), supporting GLP documentation requirements.

Software & Data Management

The TP111 embeds firmware with built-in data logging capability—storing timestamped pH and temperature readings at user-defined intervals (1 min to 24 h). Logged data can be reviewed locally via scrolling historical trend curves directly on the LCD, enabling visual assessment of diurnal pH drift, process upsets, or neutralization efficiency. No proprietary PC software is required for basic operation; however, optional RS485 Modbus RTU communication (add-on module) enables remote parameter read/write, batch export of logs, and integration into centralized asset management platforms. Audit trail functionality includes automatic timestamping of all calibration events, relay state changes, and range modifications—supporting FDA 21 CFR Part 11 readiness when paired with validated host systems.

Applications

• Continuous monitoring of influent and effluent pH in municipal and industrial wastewater treatment plants
• Real-time control of acid/base dosing in cooling tower water treatment and boiler blowdown systems
• Quality assurance of purified water (PW) and water-for-injection (WFI) loops in pharmaceutical manufacturing per USP
• pH supervision in food & beverage processing lines—including dairy pasteurization, brewing, and juice concentration
• Environmental compliance monitoring at discharge points subject to EPA NPDES permit limits
• Chemical synthesis reactor feedstream verification prior to catalytic or enzymatic reactions

FAQ

What electrode types are compatible with the TP111?

The TP111 supports five dedicated composite electrode models (111-001 through 111-006), each optimized for conductivity, fouling resistance, temperature tolerance, or surface geometry. Selection must match sample characteristics—notably conductivity, suspended solids content, operating temperature, and chemical aggressiveness.
Does the TP111 support automatic calibration?

No—the TP111 requires manual two-point calibration using certified pH buffer solutions. However, its calibration memory retains slope (%), offset (mV), and isothermal point data between sessions, reducing reconfiguration time.
Can the device operate on DC power only?

Yes—dual power input options include AC 220 V ±10% (50 Hz) or DC 24 V, enabling deployment in remote or explosion-protected enclosures where AC infrastructure is unavailable.
Is the instrument suitable for drinking water applications?

Yes—when equipped with the low-conductivity electrode (111-001) and calibrated per ISO 10523, the TP111 meets accuracy requirements for potable water pH monitoring under WHO and EU Drinking Water Directive Annex I criteria.
How is long-term stability maintained in harsh industrial environments?

Through SMT-based PCB construction, conformal coating of critical analog sections, IP65 ingress protection, and galvanic isolation between sensor inputs, power supply, and output circuits—minimizing ground-loop interference and electrochemical noise.