Hanna HI8931 EC Analog Controller with Input from Probe or Transmitter

Description

The Hanna HI8931 EC Analog Controller is a precision‑engineered, panel‑mounted conductivity meter and control unit designed for high‑reliability performance in industrial processes. This instrument is available in four distinct model variants—HI8931AN, HI8931BN, HI8931CN, and HI8931DN—each calibrated for a specific measurement range to address diverse industrial needs. With ranges spanning from 0.0–199.9 mS/cm to ultra‑fine conductivity readings of 0.0–199.9 µS/cm, the HI8931 can manage applications from high‑conductivity wastewater streams to ultrapure water monitoring. Its sophisticated design ensures accuracy to ±2% of full scale (excluding probe error), providing dependable readings in mission‑critical contexts. Models are closely matched to corresponding HI8936 transmitter units, enabling seamless system integration in both in‑line and tank measurement scenarios.

Advanced Automatic Temperature Compensation For Accuracy

Fast, precise readings even in environments with sudden temperature fluctuations are achieved through the HI8931’s built‑in automatic temperature compensation (ATC) system. This system, operating over a range of 0 to 60°C (32 to 140°F) with a compensation coefficient β=2%/°C, ensures conductivity readings remain stable and accurate. The use of recommended probes—HI7635 for in‑line and HI7638 for tanks—provides integrated NTC temperature sensors to feed the ATC function. This combination eliminates manual correction during process variability, making the HI8931 an ideal choice for industries such as food & beverage production, chemical manufacturing, and water treatment facilities, where even minor deviations can compromise product quality or process safety.

Reliable Signal Transmission With Integrated Or Remote Probes

The HI8931 is engineered to support both direct probe connections and long‑distance signal transmission via analog output. For installations located within 20 meters (67 feet) of the controller, a direct connection to the conductivity probe eliminates the need for external signal amplification, reducing system complexity. For extended distances up to 300 meters (1000 feet), coupling with the HI8936 or HI8936L series transmitters converts measurements into robust, interference‑free 4–20 mA signals suitable for industrial environments with high electromagnetic noise potential. This flexibility allows plant operators to position measurement points optimally without sacrificing signal integrity, making the HI8931 particularly suited to large‑scale process plants, municipal water systems, and distributed environmental monitoring infrastructure.

Industrial Design With Enhanced Front Panel Protection

Recognizing the rigors of industrial applications, the HI8931 is built with a flame‑retardant ABS body, shock‑proof construction, and a transparent splash‑proof front cover. Panel mounting ensures secure integration into process control consoles, with dimensions optimized (141 x 69 mm cutout) for compatibility with DIN standards. Backlit LCD display technology enhances visibility in poorly lit environments or when operators wear safety goggles that reduce contrast. Manual two‑point calibration via offset and slope trimmers is accessible from the front panel, allowing technicians to perform routine adjustments with minimal downtime. The selection of robust materials guarantees mechanical stability, chemical resistance, and prolonged operational lifespan in environments such as marine processing facilities, pulp & paper plants, or mining operations.

Versatile Applications In Water Treatment And Processing

The HI8931’s measurement flexibility and resilience make it indispensable across numerous application domains. In municipal water systems, it ensures compliance with regulatory conductivity limits in potable water. In industrial boiler systems, it monitors feedwater quality to prevent scaling and corrosion. Food & beverage processors rely on it to confirm rinse water meets purity standards, avoiding contamination in production lines. Environmental monitoring agencies employ the HI8931 to track river and lake conductivity as a measure of ecological balance and pollutant dispersion. Across all these uses, integration with dosing control systems—via an isolated 2A, 240V setpoint relay—enables automatic chemical corrections, a critical feature where conductivity serves as a process feedback variable.

Seamless Integration With Automated Dosing And Alarms

Process automation compatibility is a defining attribute of the HI8931 EC Analog Controller. An isolated setpoint relay and adjustable over‑dosing control (5 to 60 minutes) provide flexible dosing management with OFF/AUTO/ON modes selectable via front panel switches. Alarm relay functions are capable of over one million operational strokes, safeguarding against out‑of‑range readings that might indicate process faults. Recorder output in isolated 4–20 mA format connects directly to plant SCADA systems or data loggers, enabling historical trend analysis and predictive maintenance planning. These integration features equip the HI8931 to serve not only as a measurement tool but also as a central control component in automated industrial ecosystems.

Global Availability With Guaranteed Authenticity Via tpt24.com

For organizations seeking assured quality and worldwide delivery, tpt24.com stands as the premier global retailer of the Hanna HI8931 EC Analog Controller. As the leading online store for precision measurement instruments, tpt24.com provides authenticity guarantees and rigorous quality verification for every unit sold. Regardless of your country of operation, tpt24.com ensures swift delivery, backed by customer support that understands industrial instrumentation requirements. Purchasing through this trusted channel protects your investment by ensuring the product meets Hanna Instruments’ manufacturing standards, free from unverified third‑party alterations, and compliant with all original specification parameters outlined in Hanna’s documentation.

Specification Summary For Precision And Operational Planning

The Hanna HI8931 range offers carefully calibrated technical parameters across its model variants. Measurement ranges and resolutions vary per model: HI8931AN (0.0–199.9 mS/cm, 0.1 mS/cm resolution), HI8931BN (0.00–19.99 mS/cm, 0.01 mS/cm resolution), HI8931CN (0–1999 µS/cm, 1 µS/cm resolution), and HI8931DN (0.0–199.9 µS/cm, 0.1 µS/cm resolution). Accuracy is ±2% F.S., with temperature compensation from 0–60°C. Calibration is manual, with recorder output in isolated 4–20 mA format. The unit operates in environments from −10 to 50°C at up to 95% RH non‑condensing. Power supply versatility (115 or 230 VAC) and compact weight (1 kg) make the HI8931 adaptable to various industrial control panels without imposing significant space or weight constraints.