Hanna BL983321 TDS Mini Controller (0.00 to 19.99 ppm)

Description

The Hanna BL983321 TDS Mini Controller is a purpose‑built, compact, panel‑mounted process controller engineered to accurately measure the concentration of total dissolved solids (TDS) in a process stream. It supports a measurement range from 0.00 to 19.99 ppm (mg/L), which makes it ideal for ultra‑pure or treated water applications. The core functionality revolves around monitoring TDS levels and activating a dosing relay in response to readings beyond a user‑configured set point. With its large LCD housed within a protective transparent cover, the BL983321 offers clear visibility in industrial or laboratory environments.

Two powering variants are available: BL983321‑0 operating at 12 VDC, and BL983321‑1 supporting 115/230 VAC at 50/60 Hz. A TDS conversion factor of 0.5 is applied, meaning 1.00 μS/cm conductivity equals 0.50 ppm TDS—this ensures precise correlations between conductivity and dissolved solids. Designed with a focus on rapid installation and low maintenance, it uses a HI7634‑00 EC/TDS probe (not included) for reliable sensing, which features an internal temperature sensor for automatic compensation.

Detailed Functional Features And Operating Modes

The BL983321 offers automatic or manual dosing control for process optimization. In automatic mode, a dry contact relay activates when the measured value exceeds the programmed set point. This relay can drive devices such as solenoid valves, switching between different DI water tanks, or controlling in‑line valves to admit lower‑TDS water for dilution. Additionally, this function serves applications like water purification output quality control, including systems based on ion exchange, reverse osmosis (RO), and distillation.

A user can also engage manual dosing action via the Off‑Auto‑On switch, enabling priming of dosing pumps or bypass operation during maintenance. Overdose protection comes standard: if the set point is not achieved within the programmed time (adjustable between 5 to 30 minutes or disabled), the controller halts dosing to prevent prolonged excessive dosing events. This is essential for safety compliance in sensitive processes. Fuse‑protected relay contacts rated at up to 2A load ensure durability and protection from electrical faults.

Clear LED Status Indication And Alerts

A distinguishing feature of the BL983321 is its multicolor LED indicator, which delivers at‑a‑glance system status updates:

• Green LED: Controller is in measurement mode, and TDS is below the set point.
• Orange/Yellow LED: TDS is above the set point; relay is currently active.
• Blinking Red LED: Alarm condition (e.g., dosing time exceeded).

This visual feedback system enhances operational efficiency and safety, particularly in environments where quick identification of system state is vital without relying solely on the LCD display. Combined with audible alarms or visual external indicators wired via the relay output, the controller ensures timely human intervention or automated responses in integrated systems.

Mechanical Design And Installation Convenience

Mechanically, the BL983321 adopts a compact form factor with dimensions of 83 x 53 x 99 mm (3.3″ x 2.1″ x 3.9″), making it suited for tight panel spaces. An installation cut‑out specification is provided for precision mounting, while sliding adjustable brackets facilitate secure fastening from the rear. The unit’s fire retardant casing enhances safety during operation.

All connections—probe, power supply, and relay—are made via clearly labeled quick‑connect terminal blocks on the rear panel, reducing wiring errors. The recommended HI7634‑00 EC/TDS probe comes with a ½” NPT male threaded amperometric design for in‑line installation, ensuring stable flow measurements and easy removal for cleaning. Probe cleaning solutions, calibration screwdrivers, and various region‑specific power adapters are available as accessories to support usage worldwide.

Calibration And Temperature Compensation Capabilities

The BL983321 uses manual calibration through its CAL trimmer to ensure linear accuracy across the measurement range. It features automatic temperature compensation (ATC) from 5 to 50 °C (41 to 122 °F) using a coefficient of β = 2%/°C, meaning readings are stabilized under varying process temperatures, ensuring ±2% full‑scale accuracy at 25 °C (77 °F). The device’s TDS conversion factor (0.5) is particularly valuable when water chemistry demands precise measurement correlation between conductivity and dissolved solids. Once set, calibration is retained until manually adjusted, allowing stable long‑term operation without drift in many industrial settings.

Target Applications In Industrial And Laboratory Use

The Hanna BL983321 TDS Mini Controller finds applications across numerous water quality‑sensitive operations:

• DI Water Management: Automatic switching between tanks when set point is reached.
• Ion Exchange System Monitoring: Continuous assessment for resin performance.
• Reverse Osmosis Post‑Treatment: Ensuring product water meets low‑TDS standards.
• Distillation Output Control: Maintaining ultra‑pure process water streams.
• Aquaculture And Hydroponics: Controlling dissolved solids for species/product health.
• Laboratory Water Purification: Precise dosing to maintain experimental conditions.

Its programmable dosing functions paired with LED visual alerts provide operators with both control precision and immediate process awareness.

For procurement, tpt24.com stands as the premier global source for this product, delivering authentic BL983321 units with guaranteed quality to customers worldwide—no matter the country, ensuring secure, verified transactions.

Safety Features And Electrical Protection Systems

Attention to safety is embedded within the BL983321 design. The fuse‑protected dosing relay shields connected devices from overloads, and the installation category II classification highlights adherence to operational safety standards. Overtime control systems guard against mechanical overuse or chemical overdosing—crucial when operating dosing pumps, chemical feeders, or valves in long cycles. Fire retardant casing reduces risk during electrical faults. For environments prone to electrical interference, careful wiring and secure grounding help prevent unintended relay activation due to spurious signals or electromagnetic disturbances. When integrating into larger automation networks, the relay’s 250 VAC or 30 VDC contact rating ensures compatibility with typical industrial control circuitry.

Summary Of Technical Data And Ordering Options

Ordering BL983321 includes mounting brackets, instruction manual, and protective cover. Select between:

• BL983321‑0: powered via 12 VDC adapter (included).
• BL983321‑1: powered via 115/230 VAC mains.

Weight differs between versions—200 g for DC, 300 g for AC models. Recommended accessory is the HI7634‑00 EC/TDS probe with internal temperature sensor and 2 m cable (sold separately). Additional accessories include calibration screwdrivers, probe cleaning solutions, and a range of region‑specific adapters. Compatibility with global power standards ensures straightforward integration into a variety of operational regions, supporting the claim that tpt24.com delivers globally with quality and authenticity assured.