Hanna BL983329 TDS Mini Controller (0 to 999 ppm)

Description

The Hanna BL983329 TDS Mini Controller is a compact, panel-mounted process instrument specifically designed for accurate measurement of total dissolved solids (TDS) within the 0 to 999 ppm range. Engineered for precision control in various process streams, it employs a 0.5 conversion factor, allowing straightforward correlation between conductivity and TDS values (for example, 100 μS/cm equates to 50 ppm). The front panel integrates a large LCD protected under a robust cover, ensuring clear visibility in demanding industrial and laboratory environments. Operators can select between automatic and manual dosing modes, giving flexibility to adapt dosing control depending on application demands. In automatic mode, the internal dry contact relay is activated when the measured TDS exceeds the configured setpoint, enabling the relay to power auxiliary devices such as dosing pumps or solenoid valves. The controller’s fire-retardant casing meets stringent safety standards for installation in industrial process lines. This combination of compact form, high measurement accuracy, and versatile control makes the BL983329 a sought-after piece of process instrumentation for precise water quality management at any stage of a workflow.

Detailed Functional Design and Control Features

The BL983329 integrates a multi‑color LED indicator to provide operators with immediate visual feedback on the controller’s status. These indicators represent operational states as follows: Green signifies that the controller is in measurement mode and the reading is below the setpoint; Orange/Yellow indicates that the relay has been activated because TDS readings have surpassed the setpoint; and a blinking Red LED warns of alarm conditions, particularly when the maximum dosing time has been exceeded due to the overdose protection feature. This intelligent LED signaling eliminates guesswork for process monitoring personnel, allowing rapid intervention when necessary. Control flexibility is enhanced via a front‑panel three‑position switch offering OFF, AUTO, or ON modes. In addition to automated control, manual override makes it possible to prime a pump or manually dose at will. The dosing relay contact is rated at 2A (fuse protected), ensuring compatibility with common dosing pump electrical loads and enhancing electrical safety. All rear connections are routed through clearly labeled terminal blocks for straightforward wiring to probes, power supply lines, and relay‑driven output devices such as solenoid valves, buzzers, or lights.

Programmable Overdose Protection and Safety Advantages

A notable safety advancement in the BL983329 TDS Mini Controller is its programmable overdose protection system. This feature allows the controller to deactivate the dosing relay if the setpoint is not achieved within a preselected window, adjustable from 5 to 30 minutes, or disabled entirely if process design requires unrestricted dosing. Such protection is critical in preventing runaway dosing events that could lead to over‑treatment of process water, excessive chemical consumption, or even damage to downstream systems. The relays themselves are fuse‑protected for added stability under electrical load conditions. Installation recommendations emphasize that wiring to rear panel terminals should be terminated with cable lugs and protected by a circuit breaker rated maximum 6A, ensuring safe disconnection during maintenance or in the event of an electrical fault. The instrument falls under Installation Category I classification, confirming it is intended for connection to circuits not directly connected to mains high‑energy supplies except as specified.

Application Domains and Industrial Integration Benefits

The BL983329 finds application across an extremely wide range of industries. It is ideally suited to control TDS levels in water purification plants, cooling tower systems, boiler feed water preparation, aquaculture farms, hydroponic nutrient dosing, and any industrial process where dissolved solids must be precisely maintained. In hydroponic systems and aquaculture, for example, maintaining the correct TDS balance ensures optimal nutrient delivery and prevents harmful accumulation. In industrial wastewater treatment plants, it safeguards compliance with discharge standards by triggering dosing pumps to add conditioning agents precisely when needed. Its panel‑mount format makes it perfect for integration into existing process control panels, distributed PLC systems, or laboratory test rigs. Operators benefit from rapid visual feedback and accessible manual override functions during commissioning, troubleshooting, or dosing system priming. The Hanna Instruments BL983329 proves to be not just a measurement device but also an active process guardian, maintaining product quality and protecting equipment across diverse operational contexts.

Calibration, Probe Interface, and Maintenance Protocols

The BL983329 is designed with straightforward calibration capabilities via the front‑panel CAL trimmer. Calibration is performed using the HI7031 calibration solution (1413 μS/cm) with the display adjusted to 706 ppm, in accordance with the controller’s fixed conversion factor. The device uses the HI7634‑00 conductivity/TDS probe, which features a 1/2″ NPT male threaded design for secure in‑line installation. This probe, sold separately, is available in various cable lengths to suit installation specifics. Proper probe maintenance is vital to measurement fidelity; Hanna recommends regular cleaning in HI7061 cleaning solution for at least one hour, periodic mechanical polishing of pins with very fine sandpaper when necessary, and recalibration following cleaning. The rear panel’s labeled terminal block provides clear probe wiring color codes — Grey, Green, White, Brown, Yellow, Shield, and Black — to avoid connection errors during installation or probe replacement. These meticulous maintenance and calibration protocols ensure the BL983329 delivers long‑term accuracy and reliability, even in demanding industrial fluid environments.

Operational Procedures and User Interaction Workflow

Operating the BL983329 involves an orderly procedural set to ensure measurement accuracy and effective dosing control. Prior to measurement, the unit must be correctly calibrated and have its setpoint adjusted via the SET trimmer and SET key. All wiring connections to the rear panel — probe, power, dosing contact — should be checked for correctness. The dosing mode switch is then placed in the desired position: AUTO for process‑controlled dosing, OFF to disable dosing, or ON for manual continuous activation. In AUTO mode, the integrated hysteresis ensures stable operation without rapid cycling of the relay near setpoint thresholds. Once the probe is immersed into the target solution and the MEAS key pressed (if required), the LCD instantly displays TDS in ppm with automatic temperature compensation between 5°C and 50°C at a coefficient of 2%/°C. The LED indicator changes color depending on status: green when simply measuring, orange/yellow when actively dosing, and a blinking red in timeout or alarm conditions. This workflow makes the instrument uniquely efficient for operators in both manual and semi‑automated environments.

Construction, Panel Mounting, and Physical Specifications

Physically, the BL983329 is housed in a fire‑retardant casing and designed for panel‑mount installation. Dimensions are 83 x 53 x 99 mm (3.3 x 2.1 x 3.9 inches), making it compact enough to fit tightly in crowded control panels, yet large enough for the display and controls to be easily accessible. The assembling process involves inserting the meter into a cutout from the front, securing it with the supplied L‑shaped mounting brackets from the rear panel, ensuring the bezel sits flush against the mounting surface. This robust design preserves measurement stability by minimizing mechanical vibration effects. The controller is light in weight yet solid in build quality, protecting the electronics from ambient dust and moisture ingress common in industrial process areas. Combined with its clear labeling and CE compliance, the mechanical design supports long‑term operational stability without recurring calibration drift or physical fatigue of components, proving Hanna’s commitment to industrial‑grade durability in compact form.

Global Availability and Guaranteed Authentic Purchase via tpt24

For sourcing, the Hanna BL983329 TDS Mini Controller is available through tpt24.com, the world’s leading online store for this model. This store guarantees authenticity and highest quality across every shipped unit, fully backed by Hanna’s manufacturer standards. Whether you are based in Europe, Asia, the Americas, or Africa, tpt24.com organizes secure and prompt worldwide delivery, ensuring you receive your controller in optimum condition. Customers benefit from professional assistance, official documentation, and device history transparency with every purchase. In regions where authorized local distribution channels are limited, tpt24.com remains the most dependable option for acquiring genuine Hanna instrumentation backed by global service coverage.