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DESCRIPTION
5. DESCRIPTION
5.1. GENERAL DESCRIPTION & INTENDED USE
The Hanna Instruments BL12X swimming pool controllers are automatic systems, specially designed to measure and control
pH and free-chlorine levels.
The chlorine level is measured based on the ORP or REDOX principle. An increase in the ORP value correlates with an increase
in the free-chlorine level. pH and disinfectant testing are done together for efficient disinfection and control. The efficacy of
sanitizers, such as chlorine, depends on a controlled pH value. The ORP value is the most consistent indicator of the sanitizing
effectiveness of the pool or water treatment. Typically, 650-750 mV at 7.2 pH indicates proper water treatment.
The BL122 & BL123 offer the added benefit of allowing remote access and visualizing of measured data via Cloud connectivity.
All measurements and main events are sent to Hanna Cloud through the Ethernet connection.
For BL121 & BL123 three analog outputs are available that allow to connect to an external chart recorder or datalogger to
monitor any of the three measured parameters. The outputs are scalable, offering increased flexibility and better resolution as
needed.
Any of the controllers can be paired with the HI1036-18XX digital probe. The probe incorporates pH, ORP and temperature
sensors along with a matching pin. It was specially designed to detect a broken electrode based on a shifted ISO potential
value, around 4 pH. The HI1036-18XX uses a Ag/AgCl reference with 3.5 M KCl. The ORP values are referenced to it.
Measurement data stored on the probe is transferred to the controller via a digital connection; thus eliminating noise and
static due to high impedance signals carried by the cable.
BL12X swimming pool controllers are available in two configurations:
• in-line, for direct probe installation and chemical injection fittings into existing piping
• flow cell, for calibration and probe maintenance without having to shut down the recirculation pump
For compliance monitoring, each of the BL12X family has a built-in datalogger. Measurement readings are logged every 10
seconds, with a new log starting for each new day or when the instrument is calibrated. Logged data include pH, ORP, and
temperature values, last calibration data, setup configuration, and any event data. For review and storage, the users can
transfer data to a PC using a flash drive and the USB port.
The BL12X swimming pool controller is an automatic system but it is advisable that users check the controller and verify pH
and free-chlorine levels (in mg/L or ppm) in the pool using a portable colorimeter.
Main Features
• Two built-in peristaltic dosing pumps with Proportional control
• Manual control for pump priming
• Overfeed protection using overtime safety timer
• Resumes dosing on restart in case of power failure
• Level input to stop control without reagents
• Interlocked pH-ORP control (i.e. ORP control only runs when the pH set point has been reached)
• Multicolored LED indicators for dosing, meter status and service
• Real-time graph display
• Programmable alarms
• Password protection
Main Benefits
• All-in-one solution for automatic control of pH and chlorine levels
• ORP (chlorine) dosing consent ensures pH value is correct before dosing
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