HACH HC3800 sc pH Electrode
| Brand | HACH |
|---|---|
| Origin | Imported |
| Manufacturer Status | Original Equipment Manufacturer (OEM) |
| Model | HC3800 sc pH Electrode |
| Pricing | Available upon Request |
Overview
The HACH HC3800 sc pH electrode is a high-stability, submersible composite sensor engineered for continuous, long-term pH monitoring in natural and engineered water systems. It operates on the fundamental principle of potentiometric measurement, where the voltage difference between a pH-sensitive glass membrane and a stable reference system—configured as a dual-chamber liquid junction—is converted into a precise pH value via the Nernst equation. Integrated Pt1000 thermistor technology enables real-time, high-fidelity temperature measurement directly at the sensing interface, ensuring accurate automatic temperature compensation (ATC) across dynamic thermal environments. Designed specifically for unattended operation in open-water applications—including rivers, lakes, reservoirs, estuaries, and coastal zones—the HC3800 sc delivers robust performance under variable flow, biofouling-prone conditions, and fluctuating ionic strength.
Key Features
- Dual-chamber liquid-junction reference system minimizes electrolyte depletion and junction clogging, significantly extending operational service life in low-conductivity or particulate-rich waters.
- Integrated Pt1000 platinum resistance thermometer located within the electrode body provides spatially co-located temperature measurement—critical for eliminating thermal lag and improving ATC accuracy per ISO 7888 and ASTM D1293.
- Submersible, IP68-rated housing with chemically resistant PEEK and EPDM materials ensures mechanical durability and compatibility with freshwater, brackish, and low-salinity marine matrices.
- Optimized glass membrane formulation offers rapid response time (<15 seconds to 95% of final reading) and stable potential drift (<0.1 mV/h) under continuous immersion.
- Standardized 12-pin sc-series connector enables seamless integration with HACH SC1000, SC200, and SC400 controllers, supporting analog (4–20 mA) and digital (Modbus RTU over RS-485) output protocols.
Sample Compatibility & Compliance
The HC3800 sc is validated for use in ambient surface waters with conductivity ranging from 50 µS/cm to 2,000 µS/cm and temperatures between 0 °C and 50 °C. It meets the functional requirements of EPA Method 150.1 and ISO 10523 for field-deployable pH measurement. Its design conforms to IEC 61298-2 for industrial process analyzers and supports GLP-compliant data integrity when paired with HACH’s sc-series controllers featuring audit-trail-enabled firmware (aligned with FDA 21 CFR Part 11 principles). The electrode does not require frequent recalibration in stable environments; typical verification intervals are 7–14 days under routine monitoring conditions.
Software & Data Management
When connected to HACH’s sc-platform controllers, the HC3800 sc supports automated calibration logging, drift tracking, and diagnostic alerts—including junction impedance monitoring and temperature deviation flags. All measurements are timestamped and stored locally with configurable sampling intervals (1 min to 24 h). Data export is supported via SD card, USB, or Modbus TCP gateways to SCADA or LIMS platforms. Firmware updates maintain compliance with evolving environmental reporting standards, including those referenced in EU WFD (Water Framework Directive) monitoring programs.
Applications
- Real-time pH surveillance in riverine and lacustrine ecosystems for trend analysis and early-warning detection of acidification events.
- Regulatory compliance monitoring at wastewater discharge points and stormwater outfalls per NPDES permit requirements.
- Integration into multi-parameter buoys and autonomous profiling systems for vertical pH profiling in stratified water columns.
- Supporting limnological research studies requiring high temporal resolution pH data alongside dissolved oxygen, conductivity, and turbidity.
- Calibration traceability in mobile laboratory deployments where field validation against NIST-traceable buffer standards is required.
FAQ
What is the recommended calibration frequency for the HC3800 sc in continuous surface water monitoring?
Calibration is advised before initial deployment and thereafter every 7–14 days depending on water matrix stability; verification using two-point (4.01 and 7.00) NIST-traceable buffers is mandatory for regulatory reporting.
Can the HC3800 sc be used in seawater or high-salinity estuarine environments?
It is rated for low-to-moderate salinity (≤15 ppt); prolonged exposure to full-strength seawater (>35 ppt) may accelerate reference electrolyte diffusion and is not recommended without protective fouling mitigation strategies.
Does the electrode support automatic temperature compensation without an external probe?
Yes—the integrated Pt1000 sensor provides fully embedded ATC; no auxiliary temperature input is required for standard operation.
Is the HC3800 sc compatible with non-HACH data loggers?
Only when the logger supports Modbus RTU protocol and correctly interprets the sc-series register map; analog output (4–20 mA) offers broader third-party compatibility but sacrifices digital diagnostics and calibration metadata.
