Hanna BL12X Analog Outputs Swimming Pool and Spa Controllers

Description

The Hanna BL12X Analog Outputs Swimming Pool and Spa Controllers combine advanced water quality monitoring with highly accurate dosing control, specifically designed for maintaining pH, oxidation-reduction potential (ORP), and temperature levels in pools, spas, and hot tubs. These controllers deliver precise measurements through a digital multiparameter pH/ORP/temperature electrode (HI1036‑1802) that includes a matching pin to prevent ground loop effects and protect against electrode damage. With proportional feed dosing and adjustable set points, facility managers can avoid swings in chemical levels that might compromise safety and comfort. The unit features overdosing protection, delay start functionality, and temperature‑compensated pH measurement for optimal chemical response. By integrating automatic logging, storage via USB, and scaling 4–20 mA analog outputs, users can confidently track and adjust pool chemistry without constant on‑site supervision. As supplied, the BL12X delivers both the precision demanded by professional aquatic facilities and the durability required for continuous operation.

Dual Peristaltic Dosing Pumps for Efficiency

A key engineering highlight of the BL12X series is its dual peristaltic pump system, built with replaceable chemical‑resistant tubing to withstand continuous chemical exposure. One pump doses acid or base, while the other delivers chlorine for oxidation control. This peristaltic design eliminates the issue of chlorine gas accumulation — a common problem with diaphragm pumps — which can cause loss of pump prime and dosing interruption. Automatic proportional pump control allows operators to set proportional bands based on water volume and chemical sensitivity, ensuring fine‑tuned responses. For instance, a large pool may be assigned a narrow band (0.1 pH) to maintain steady dosing close to the target, while a hot tub may require a wider band (1.0 pH) to prevent sharp chemical fluctuations. The dosing rate is adjustable between 0.5–3.5 L/h, offering flexibility to match chemical demand to the specific conditions of each installation.

Built-In Safety and Consent Features

Safety is integral to the BL12X controller design. The ORP (chlorine) dosing consent feature ensures chlorine is never added until pH is first corrected, avoiding wastage and excessive chlorine concentrations that can irritate skin or eyes. This is particularly important due to the inverse relationship between pH and ORP — as pH rises, ORP drops regardless of chlorine presence. The BL12X also connects to optional tank level sensors to stop dosing when the chemical reservoir is empty. Additionally, a hold input can be linked to a flow switch or recirculation pump relay to prevent dosing when there is no water circulation, thus safeguarding against localized overdosing. These controllers feature programmable alarms for pH, ORP, and temperature, with triggers activated after five consecutive out‑of‑range readings. Once in alarm mode, dosing stops automatically, and LED indicators change color to reflect the operational status, protecting both users and equipment.

Flexible Installation and Operation Configurations

The BL12X offers two installation options: In‑Line and Flow Cell configurations. In‑Line installation mounts the probe directly into the piping via a saddle fitting after the pool filter, allowing for immediate measurement in the circulation system. Flow Cell installations mount the probe close to the controller, with the water sample directed via tubing; an inlet valve enables calibration and maintenance without stopping the recirculation pump. Both approaches accommodate the varied infrastructure of hotels, resorts, spas, wellness centers, amusement parks, and residential complexes with shared pools. For data handling, the BL12X logs readings every 10 seconds, storing up to 60 days of history. CSV‑formatted files can be exported via USB for compliance reporting or performance analysis. BL121 and BL123 variants additionally feature Ethernet connectivity (BL123 only) for remote monitoring. Alarm relays, password protection, and GLP-compliant data storage ensure professional control standards are met.

Analog Outputs for Advanced Integration Needs

BL121 and BL123 variants of the BL12X controllers are equipped with three configurable analog outputs (4–20 mA, galvanically isolated) corresponding to pH, ORP, and temperature parameters. Each output can be disabled or connected to external chart recorders, building management systems, or SCADA infrastructure. Users can scale outputs to match specific process ranges, improving resolution in the range of interest. For example, default scaling assigns 0 pH to 4 mA and 14 pH to 20 mA, but operators can redefine this as pH 6 to 4 mA and pH 8 to 20 mA for higher resolution in sensitive applications. The analog output design includes ≤ 500 Ω output impedance and < 0.5% FS accuracy, ensuring dependable conversion of measured values to process signals. This capability makes the BL12X suitable not only for standalone water quality control but also for integration into large‑scale automation systems.

Comprehensive User Interface and Status Feedback

The BL12X implements a clear LCD interface with three display modes: simultaneous three‑parameter display, cycling single‑parameter display, and real‑time graph mode. This versatility enables operators to observe trends, snapshots, or cumulative conditions based on their workflow. Multicolored LED indicators provide instantaneous feedback: green signals that all parameters are within range; yellow indicates maintenance or attention required; red warns of system alarms or out‑of‑range conditions. Such visual cues help staff quickly assess the situation without navigating menus. The controller is password‑protected, restricting unauthorized access to calibration, setup, and data recall features. Good Laboratory Practice (GLP) protocols are embedded, logging calibration timestamps and values for accurate recordkeeping. Together, these interface and feedback systems simplify usage while maintaining strict operational control in demanding pool or spa environments.

Commercial and Institutional Applications Overview

Specifically engineered for professional water facilities, the BL12X analog output controllers are ideal for hotels, resorts, wellness centers, spas, amusement water parks, condominium pools, and municipal swim complexes. In such environments, consistent water quality is essential for health compliance, user comfort, and asset protection. The BL12X ensures pH, chlorine levels, and temperature remain within defined acceptable ranges automatically, reducing staff oversight requirements. The ability to integrate alarm outputs and analog measurement channels means these controllers can directly link with site monitoring platforms. This allows instantaneous notification and reactive control, minimizing downtime or unsafe conditions. By automating dosing and monitoring, facilities extend equipment longevity, reduce chemical consumption, and maintain a reputation for quality. For procurement, the global leader tpt24.com offers the Hanna BL12X series with guaranteed authenticity, quality certification, and worldwide delivery, ensuring every customer, regardless of location, receives an original product backed by manufacturer standards.

Durability, Compliance and Maintenance Advantages

The BL12X housing is IP65‑rated, wall‑mountable, and engineered to resist moisture intrusion and environmental degradation. Its compact dimensions (245 × 188 × 55 mm without pumps, 73 mm with pumps) and 1.7 kg weight make it suitable for installations where space is constrained. Power requirements are minimal — 100–240 VAC, consuming only 10 VA — enabling installation in a range of electrical service contexts. Environmental tolerances from 0–50°C and up to 95% relative humidity (non-condensing) are sufficient for most indoor pool equipment rooms or protected outdoor installations. Supplied accessories differ for in‑line and flow cell kits but always include injection fittings, tubing, filters, buffer solutions (pH 4.01, 7.01), and ORP test solution sachets, as well as full documentation. The controller warranty extends two years, with a six‑month warranty for the probe, reflecting confidence in product reliability under intended use conditions. These combined features assure facility owners that the BL12X is a sustainable and compliant investment for long‑term pool and spa operation.