Pool Controller for pH, Salinity and Free Chlorine Levels — with Cloud Connectivity

The Hanna Instruments® BL136 salt water pool controllers, together with the included BL130-7X0 salt chlorinator, are designed to automate and control Free Chlorine levels, pH and disinfection in salt water pools.

The system uses electrolysis to convert dissolved Salt (sodium chloride) in the water into hypochlorous acid (HOCl), with the aim of sanitizing the pool.

Hypochlorous acid (HOCl) is the most effective form of Chlorine for eliminating pathogens. HOCl reaches its highest concentrations between pH values of 7.2 and 7.4, acting as a disinfectant and oxidant, while also providing residual protection.

The controller displays continuous measurements of pH/ORP (redox), Free Chlorine values, as well as water and ambient temperatures and the pool water Salt level, as water circulates through the pH/ORP probe HI1038-2802 and the chlorine probe HI1040-1801.

The HI1038-2802 probe contains pH, ORP and temperature sensors, as well as reference and salinity electrodes, in a single body.

The ORP (redox) sensor is gold. The salinity pins are titanium and the probe body is PVDF.

The HI1040-1801 probe contains a chlorine sensor for real-time monitoring of chlorine levels.

BL136 salt pool controllers automate Chlorine generation and acid or base additions according to configured set points or periods.

Chlorine is generated by the BL130-7X0 chlorinator in a continuous flow system that requires the pool recirculation pump to be active.

In automatic mode, Chlorine generation only starts once the pH reference value has been reached. Acid or base additions are carried out via the integrated peristaltic pump with proportional control, to prevent overdosing.

 

Cloud Connectivity

The BL136 pool controller can connect to Hanna Cloud, a web-based application that links it to your BL136.

Hanna Cloud measurements and data storage can be accessed from most modern web browsers or through the Hanna Pool app, available for iOS and Android.

Multiple devices can be registered under a single Hanna Cloud account.

Measurements, trends, history, device settings, alarms and messages are transmitted to Hanna Cloud as your instrument measures and controls your process.

Several secondary users can also be added to your device account to monitor measurements and receive notifications from your controller. Hanna Cloud incorporates security measures to protect your personal information. We protect your information through technical and administrative security measures to reduce the risk of loss or misuse. These include (among others) a secure connection, device identity registration and password encryption.

 

Hygiene Monitoring and Control

The BL135 system is based on a two-stage approach to automated chlorine management and water hygiene monitoring. The membrane-covered chlorine electrode HI1040-1801 measures the actual free chlorine concentration (mg/L) in the pool water and is used for primary control. This probe contains a chlorine sensor for real-time monitoring of chlorine levels. The HI1038-2802 pH sensor is highly effective at measuring pool water alkalinity, allowing real-time monitoring of disinfection effectiveness. This probe contains pH, ORP and temperature sensors, as well as reference and salinity electrodes, in a single body.

The system uses the pH sensor to compensate the signal, ensuring that even if the pH varies slightly, the chlorine reading remains accurate.

 

BL130-7X0 Chlorinator Control

Chlorinator control can automatically regulate chlorine production using set points and chlorine (Cl) measurements, as well as fixed chlorine output.

It features a Fixed Mode, Pool Start-up Mode, "Boost" and "Scheduled Boost" Mode, and pool cover detection.

Depending on the size and needs of each pool, distinct versions are available by chlorinator capacity (g/h):

• BL136-20110 — Pool controller for pH, salinity and free chlorine levels, with salt chlorinator capacity of 10 g/h
• BL136-20120 — Pool controller for pH, salinity and free chlorine levels, with salt chlorinator capacity of 20 g/h
• BL136-20130 — Pool controller for pH, salinity and free chlorine levels, with salt chlorinator capacity of 30 g/h

Contact us for further details and pricing.

 

Specifications	Chlorinator BL130-710	Chlorinator BL130-720	Chlorinator BL130-730
Pool dimensions	30 m³ / 7,925 gal	100 m³ / 26,417 gal	150 m³ / 39,600 gal
Chlorine production	10 g/hour	20 g/hour	30 g/hour
Power	4 A	5 A	7 A
Bipolar cell design	3 interlinked blades / 10 floating blades	2 interlinked blades / 5 floating blades	3 interlinked blades / 10 floating blades
Plate dimensions	100 × 61 × 1 mm	164 × 61 × 1 mm	148 × 61 × 1 mm
Required flow rate	150 to 450 L/min (40 to 119 GPM)	150 to 450 L/min (40 to 119 GPM)	150 to 450 L/min (40 to 119 GPM)
Recommended salinity	4.0 to 6.0 g/L	4.0 to 6.0 g/L	4.0 to 6.0 g/L

 

Key Features

• Integrated peristaltic pump with proportional control for pH regulation, to prevent overdosing
• Chlorinator (salt electrolysis cell) to produce disinfectant chlorine from salt water
• Available in a range of cell sizes and production capacities to suit different pool sizes and needs
• Programmable modes for automatic control of the salt chlorinator via:
  • Free chlorine sensor measurement
  • Fixed mode and automatic mode
  • Pool start-up mode
  • Boost mode
  • Pool cover mode
• The self-cleaning electrolysis cell reverses polarity to remove deposits caused by water hardness
• Dosing resumes on restart in the event of a power failure
• Manual control for pump priming
• Inlet level detection
• Ambient temperature sensor: triggers the relay to activate the recirculation pump, preventing water from freezing in the pipework
• Configurable logging interval
• Real-time graph display
• LED indicators for controller status, maintenance and pump (dosing) operation
• Removing the magnetic front plate stops the pump's internal movement
• Front connection panel for easy access
• USB port for logged data and firmware updates
• BL136 model available with Cloud connectivity (parameter monitoring and remote configuration of settings)
• Help section — overview of the instrument's main functions and features
  
  

How to Order

Each BL136-20110 is supplied with:

 

Salt chlorinator BL130-710, Flow cell panel BL130-415, Flow cell BL130-410 for the HI1040-1801 Free Chlorine probe (includes mounting brackets), HI1040-1801 Free Chlorine probe, HI1040A replacement membrane cap for the HI1040-1801 Free Chlorine probe, HI7043S gel electrolyte for the HI1040-1801 Free Chlorine probe 30 mL, HI1038-2802 combined pH, ORP, Salinity and temperature probe, HI7014 Checker® HC Pool Line for free chlorine with starter reagent kit (6 tests) and sample cuvettes (2 units), BL130-900 ambient temperature probe, pH probe holder for Ø 50 mm pipe, injector holder for Ø 50 mm pipe, injector, valve for connection to the flow cell and fittings (2 units), valve holder for Ø 50 mm pipe (2 units), PVC tubing for suction and injection (5 m), flow cell tubing (10 m), peristaltic pump tubing, silicone oil (dropper bottle), suction filter, cable gland seals (BL136 only), pH 4.01 and 7.01 standard solution (3 sachets each), 470 mV ORP test solution (3 sachets), 5.00 ppt Salinity calibration standard (3 sachets), power cable, quality certificates (instrument, probes, chlorinator, accessories), quick reference guide with QR code to download the Instruction Manual.

 

General Specifications

Parameter	Range	Resolution	Accuracy	Calibration	Temperature Compensation
pH	0.00 to 14.00 pH*	0.01 pH	±0.05 pH (at 25 °C / 77 °F)	Standard pH: automatic buffer recognition, two points (4.01 pH, 7.01 pH, 10.01 pH). Process pH: adjustable, single point	Automatic temperature compensation for pH (range: –5.0 to 105.0 °C / 23.0 to 221.0 °F)
ORP (mV)	±2000 mV	1 mV	±5 mV (at 25 °C / 77 °F – ORP standard)	Adjustable, single point	—
Free Chlorine	0.00 to 10.00 mg/L	0.01 mg/L	±0.1 ppm ±5% of reading**	User single-point calibration, custom point	Automatic temperature compensation for chlorine (range: 15 to 40 °C / 59 to 104 °F)
Salinity	–5.0 to 105.0 °C (23.0 to 221.0 °F)*	0.1 g/L	±0.2 g/L NaCl or ±2% of reading, whichever is greater	Automatic; single-point calibration at 5.00 g/L or 35.00 g/L	Automatic temperature compensation for salinity
Temperature	–5.0 to 105.0 °C (23.0 to 221.0 °F)*	0.1 °C / 0.1 °F	±1.0 °C / ±1.8 °F (at 25 °C / 77 °F)	—	—
Air Temperature	–30.0 to 80.0 °C (–22.0 to 176.0 °F)*	0.1 °C / 0.1 °F	0.5 °C	—	—

 

pH Compensation: Automatic pH compensation for chlorine, range 6.0 to 8.0 pH*

Data Logging Memory

• Automatic logging of pH, ORP, salinity, chlorine, air and water temperature measurements
• 300 days of logging, depending on the selected logging interval
• 100 batches (when memory is full, new entries overwrite the oldest data)

Data Log Type

Event type: configuration, alarms, errors, warnings, calibration, power failure

Data Log Interval

Configurable logging interval: 30 seconds; 1; 5; 15; 30; 60 minutes

Data Log Export Options

Export to USB drive (USB-C port) in .CSV format

RJ-45

Ethernet connector (10/100 Mbps connection)

USB-C

Data export and software update

 

Notes: * The pH and temperature range may be limited by probe limits. ** When taking measurements within ± 0.5 pH, ± 2 °C and ± 25% of the free chlorine calibration value.

 

Additional Specifications

Feature	Description
pH Control	Uses pH measurement. Start-up delay when powering on the unit. Proportional power supply using an adjustable set point and adjustable proportional band. Adjustable dead band between 0.01 and 0.20 pH (Technician Mode only). Overdosing protection via overfeed timer
Chlorinator Control	Uses chlorine measurement. Programmable modes: Chlorine boost, Scheduled boost, Pool start-up, Pool cover detection. Chlorine control: AUTO, FIXED, Manual (On/Off)
Internal Pump Control	Pump flow control from 0.5 to 3.5 L/h (0.13 to 0.92 gal/h). Maximum outlet pressure of 1 atm (14 psi). Manual pump control. The magnetic front plate (covering the pump's internal moving part) activates "Hold" status when removed, stopping the pump
Pool Start-up Mode	Simplified pool start-up procedure. Manually enabled or disabled from the controller menu. Ensures a 12-hour dosing cycle to reach the intended set point. Automatically disabled when the target value is reached or the 12-hour timeout expires
Pool Cover Detection	Reduces chlorine production when pool cover is detected
Freeze Protection Mode	Air temperature measurement triggers the relay to activate the recirculation pump, preventing water from freezing in the pipework
Chlorine Boost	Ensures high chlorine levels are reached in a short time
Cold Water Protection	Reduces chlorine production when pool water is below 15 °C (59 °F)
GLP (Good Laboratory Practice)	Chlorine, pH, ORP, salinity
Meter Password Protection	Configuration, calibration and log retrieval protected by password
Relays	Alarm relay (SPDT): triggered by selectable alarm conditions for chlorine, pH, ORP, salinity and temperature. Acid/base auxiliary pump relay (SPST). Recirculation pump relay (SPDT). All relays are protected by 2 A time-delay cartridge fuses, 5 × 20 mm. Replace only with glass/ceramic time-delay cartridge fuses, 5 × 20 mm, of the same rating. All relays are rated for 250 VAC / 30 VDC and 2 A resistive load. Note: for inductive loads, a suitable external snubber circuit must be connected to prevent damage to the relay contacts
Digital Inputs	5 × digital inputs with powered contact and galvanic isolation: Acid/base tank low level, Hold mode, Pool cover sensor, Probe flow
Probe Inputs	HI1038-2802 digital pH probe: pH, ORP, salinity and temperature sensors with matching connector, IP65 connector, galvanic isolation, RS485 interface. HI1040-1801 digital chlorine probe: galvanic isolation, RS485 interface, IP65 connector. Ambient temperature sensor
Power Supply	Input: 100–240 VAC; 50/60 Hz; 3 A. Output: 24 VDC; 7 A
Housing	Wall-mounted, IP65 rated, shockproof
Environment	0 to 40 °C (32 to 104 °F), maximum relative humidity 95%, non-condensing
Dimensions	300 × 205 × 95 mm (11.8 × 8.07 × 3.7")
Weight	4100 g (144.6 oz.)