CD-10 pH Automatic Controller
| Origin | Jiangsu, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (PRC) |
| Model | CD-10 |
| Price Range | USD 280–420 |
| Instrument Type | Multifunctional pH Controller |
| Measurement Range | 0–14 pH |
| Resolution | 0.01 pH |
| Input Impedance | >10¹² Ω |
| Output Signals | 4–20 mA analog output |
| Power Supply | 220 V AC, 50 Hz |
Overview
The CD-10 pH Automatic Controller is a dual-mode electrochemical instrumentation system engineered for precise, stable, and repeatable pH monitoring and closed-loop process control in both laboratory benchtop and industrial inline environments. Built around a high-input-impedance (>10¹² Ω) pH measurement circuit compliant with IUPAC-recommended electrometric principles, the device interfaces directly with standard glass combination pH electrodes (BNC or DIN connectors) to deliver accurate potential-to-pH conversion across the full aqueous scale (0–14 pH). Its architecture integrates real-time analog signal conditioning, digital setpoint logic, and discrete actuation capability—enabling autonomous regulation of acid/base dosing systems without external PLC intervention. Designed for continuous operation under ambient environmental conditions (IP54-rated enclosure), the CD-10 meets fundamental functional safety expectations for non-hazardous area deployment in educational labs, pilot-scale bioreactors, water treatment skids, and agricultural nutrient solution management systems.
Key Features
- Simultaneous pH measurement and automatic control functionality in a single compact unit
- High-fidelity analog output: isolated 4–20 mA current loop compatible with SCADA, DCS, and data loggers (NIST-traceable calibration support)
- Dual independent relay outputs: configurable high/low limit switching (SPST, 220 V AC, 1 A resistive), suitable for direct control of peristaltic pumps, solenoid valves, or alarm indicators
- Dedicated 12 V DC auxiliary output for powering low-voltage peripheral sensors (e.g., temperature compensation probes or conductivity transducers)
- Front-panel push-button interface with LED display for local setpoint entry, calibration mode access, and status indication (pH value, relay state, error codes)
- Stable power architecture: 220 V AC ±10%, 50 Hz input with internal filtering and surge suppression for industrial electrical noise resilience
Sample Compatibility & Compliance
The CD-10 is validated for use with standard aqueous electrolyte solutions across the full pH range (0–14), including buffered standards (e.g., NIST SRM 186, pH 4.01/7.00/10.01), process streams (cooling tower water, fermentation broth, hydroponic reservoirs), and low-conductivity samples (deionized water, rainwater). Electrode compatibility includes all commercially available refillable and gel-filled combination pH electrodes meeting DIN 19263 / ASTM D1293 specifications. While not certified to IEC 61000-6-2/6-4 or ATEX/IECEx, the unit complies with GB/T 18268.1–2010 (Chinese EMC standard for laboratory equipment) and supports GLP-aligned documentation via manual calibration logs. It does not include FDA 21 CFR Part 11-compliant electronic signature or audit trail functionality.
Software & Data Management
The CD-10 operates as a standalone hardware controller with no embedded firmware-based data logging or cloud connectivity. All configuration, calibration, and operational parameters are retained in non-volatile memory during power loss. Data acquisition requires external integration: the 4–20 mA output enables connection to third-party recording devices (e.g., Omega OM-DAQPRO, Honeywell Experion PKS) or programmable logic controllers. Calibration procedures follow standard two-point (asymmetric) methodology using traceable buffer solutions; slope and offset values are displayed but not stored digitally. No proprietary software, drivers, or USB/RS-485 communication modules are provided—ensuring long-term interoperability and minimizing cybersecurity attack surface.
Applications
- Academic teaching laboratories: real-time pH titration demonstrations, enzyme activity studies requiring constant pH maintenance
- Bioprocess development: pH-stat control in shake flasks and benchtop bioreactors (E. coli, yeast, mammalian cell cultures)
- Aquaculture and hydroponics: automated nutrient solution pH stabilization using acid (HCl) or base (KOH) dosing
- Wastewater neutralization: inline pH feedback control for lime or sulfuric acid addition in effluent treatment
- Food & beverage QA/QC: batch-wise pH verification during dairy fermentation or juice pasteurization staging
- Chemical synthesis: endpoint detection in acid-catalyzed esterification or hydrolysis reactions
FAQ
Does the CD-10 support automatic temperature compensation (ATC)?
Yes—when paired with a compatible Pt100 or thermistor-based pH electrode with integrated temperature sensor, the unit applies Nernstian correction using the built-in temperature coefficient (default 0.3 mV/°C/pH unit). Manual temperature offset adjustment is also supported.
Can the relay outputs be configured for pulse-width modulation (PWM) or time-proportional control?
No—the relays operate exclusively in on/off hysteresis mode with user-defined upper and lower pH thresholds. Continuous proportional control requires external PID instrumentation.
Is electrode calibration data exportable or password-protected?
Calibration data is viewable on the front panel only and cannot be exported, archived, or secured with access controls.
What is the recommended calibration frequency for GMP-aligned operations?
Per USP and ISO 17025 guidance, daily two-point calibration is advised prior to critical measurements; documented verification every 4 hours during extended runs is strongly recommended.
Does the 12 V DC output provide regulated voltage under variable load?
The 12 V DC output is unregulated and rated for ≤100 mA continuous draw; voltage may sag below 11.5 V at full load—intended solely for low-power sensing accessories, not motor drivers or actuators.
