Hanna Instruments Australia
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Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm
Hanna Instruments Australia
Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm

pH, ORP, Temperature pool controller with external dosing, flow cell mounted on panel with analog outputs - BL131-20

$3,630.00

SKU: BL131-20 Category:


Prices include GST. Not all items are in stock. Call 03 9769 0666 to confirm.

The Hanna Instruments BL131 swimming pool controllers are automatic systems, specially designed to measure and control pH and free-chlorine levels.

For BL131, three analog outputs are available that allow connection 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.

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

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 ORP 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 spa. Typically, 650-750 mV at 7.2 pH indicates proper water treatment. The controllers offer remote access and visualizing of measured data via Cloud connectivity. All measurements and main events are sent to Hanna Cloud through the Ethernet connection.

The BL131 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 zero potential value, around 4 pH. The HI1036-18XX uses an 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.

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)
• External dosing
• The controller has 2 relays that can be used to control larger external dispensing pumps, allowing the BL131 to be used in larger pools.
• Air temperature sensor
• Allows triggering an alarm if the air temperature is cold enough that there is a risk of water freezing in the pipes (e.g. hot tubs in winter with the circulation pump off)
• Bidirectional control
• User selectable logging interval
• As pool settings normally do not change that quickly, minimize data management by choosing from a wide selection of logging intervals
• Multicolored LED indicators for dosing, meter status and service
• Real-time graph display
• Programmable alarms
• Password protection

Multiple configurations:

BL13x 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 BL13x family has a built-in datalogger. Measurement reading intervals can be set at 30s/1m/5m/15m/30m/1h, with a new log starting new each day or when the instrument is calibrated. Logged data include pH, ORP, and temperature values, last calibration data, setup configuration, and any event data. The BL13x 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.

Ordering info

BL131-20 is supplied with HI1036-1802 Combined electrode (pH / ORP / Temperature), panel mounted flow cell, valve for flow cell connections with fittings and tubing, 10 m, injector (2 pcs.), saddle for valves, Ø 50 mm pipe (2 pcs.), saddle for injectors, Ø 50 mm pipe (2 pcs.), peristaltic pump tubing (2 pcs.), PVC aspiration and injection tubing, 10m, aspiration filter (2 pcs.), 7.01 pH Buffer solution, sachet (3 pcs.), 4.01 pH Buffer solution, sachet (3 pcs.), 470 mV ORP test solution, sachet (3 pcs.), power cable, probe quality certificate, instrument quality certificate, quick reference guide with QR code for manual download.

Purchase & Shipping

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.

Free standard delivery: We offer free delivery within Australia on orders over $150, typically arriving within 5 to 7 days. Delivery times may vary depending on the courier service and the recipient's location. Free shipping is not available with other offers or discounts.

Same-day despatch: Place your order before 1 PM Monday to Friday for same-day despatch (leaves our warehouse). Delivery times may vary depending on the courier service and the recipient's location. Subject to stock availability.

Please note that we do not offer shipping to PO Box addresses.

Additional information

Weight 1.7 kg
Dimensions 24.5 × 18.8 × 5.5 cm