BL120 – Swimming Pool Controller with Built-in Dosing Pumps

Control with Confidence

The BL120 Swimming Pool Controller is a complete system designed for maintaining swimming pool, hot tub, and spa disinfection water quality. The BL120 is available in two configurations. The basic version is the in-line model which allows for direct installation of probe and chemical injection fittings into existing piping. The other version is a panel mounted version with a bypass flow cell. The bypass flow cell allows for calibration and maintenance of the probe without having to shut down the recirculation pump. Additional features of the BL120 include LED indicators for dosing, meter status and service, real-time graph display, programmable alarms, and password protection.



Κωδικός προϊόντος: BL120 Κατηγορίες: , , Ετικέτα:

Πληροφορίες προϊόντος

Multiple Configurations

The controller is available in one of two configurations: an in-line model which allows for direct installation of the probe and chemical injection fittings into existing piping (BL120-10) or a panel mounted system with a bypass flow cell (BL120-20). The bypass flow cell allows for calibration and maintenance of the probe without having to stop the recirculation pump.


Digital Combination Probe

The HI1036-1802 is a digital probe that measures pH, ORP, and temperature. This probe also incorporates a potential matching pin. The pin is considered the “earth ground” connection and is used to prevent ground loop effects from causing erratic readings and damage to the system.

Dosing & Control

Peristaltic Dosing System

The BL120 is equipped with two peristaltic dosing pumps with replaceable chemical resistant tubing. When using a diaphragm pump, chlorine gas formed from outgassing can collect in the pump head resulting in the pump losing its prime; the buildup of chlorine gas is not a problem with peristaltic pumps that use rollers and tubing.

Proportional Pump Control

The BL120 features proportionally controlled dosing pumps. Based on the sensitivity of the process to chemical addition, these controllers allow the user to adjust a proportional band. This setting determines the amount of time that the pumps are dosing as a percentage of the deviation from the set point allowing for very fine control in maintaining the desired set point.

Adjustable Flow Rate

The flow rate from the dosing pumps is adjustable from 0.5 to 3.5L/h. Larger bodies of water require more chemical to be dosed than small bodies since it takes more chemical to realize a change in the reading. The adjustable flow rate, like the proportional band, allows for better control in maintaining a desired set point.

ORP Dosing Consent

With chlorine disinfection there is an inverse relationship between pH and ORP. As the pH level increases, the ORP level decreases. The BL120 utilizes a dosing consent feature that will not dose chlorine until the pH value is first corrected since it is possible to have a low ORP value even though there is sufficient chlorine. The dosing consent feature prevents wastage of chemicals and avoids a higher than necessary chlorine concentration.

Connections & Display

Circulation Pump Monitoring

An inline flow switch or a mechanical relay connected to the recirculation pump power source may be connected to the hold input of the BL120. With no flow or when no power is applied to the recirculation pump, the hold circuit disables the dosing pumps. This will prevent any dosing of chemical when there is no movement of water in the system.

Multifaceted Display

The versatile display of the BL121 allows for three screen modes. The LCD can display all three parameters at one time, a 3-second cycle of single parameters, or a real-time plot screen with options for parameter selection, zooming, and log recall.

Programmable Alarm System

Hanna controllers allow users to enable or disable the low and high level of alarms for all parameters. When an alarm is activated, all dosing will stop. The alarm system also offers overdosing protection if the value is not corrected within a specified time interval then the meter will go into alarm status.

Multicolored LED Indicators

The BL120 offers multiple LED indicators for status, servicing, and pump operation. The STATUS LED changes color based on operational state; green when setting are in range, yellow when user intervention is required, and red for problems. The SERVICE LED indicates any alarms and process errors experienced by the controller.

Communication & Security

Automatic Logging

The readings for each parameter are automatically logged every 10 seconds. A new log is started each time the instrument is calibrated or at the start of a new day. Logged data include pH, ORP, and temperature values, last calibration data, setup configuration, and any event data. Each log is saved as a .csv file for easy transfer.

USB Connectivity

For review and storage the users can easily transfer data to a PC using a flash drive and the USB port.

Password Protection

Hanna’s BL120 controller features a password protection solution that offers restricted access to calibration, setup, and review of logged data. The password can be set and enabled/disabled during general setup of the instrument.


pH Range0.00 to 14.00 pH
pH Resolution0.01 pH
pH Accuracy±0.05 pH
pH CalibrationpH buffer calibration
pH Temperature CompensationAutomatic -5.0 to 105.0 ºC (23.0 to 221.0 ºF)
ORP Range±2000 mV
ORP Resolution1 mV
ORP Accuracy±5 mV
Temperature Range-5.0 to 105.0 ºC (23.0 to 221.0 °F)
Temperature Resolution0.1 °C (0.1 ºF)
Temperature Accuracy±1 ºC (±1.8 ºF)
Dosing ControlProportional feed using adjustable set point and adjustable proportional band. 
Delay to start at power-on and overdosing protection using.
Over feed safety timer.
Consent RelaypH dosing interlocked with ORP
Alarm Relay Set PointHigh and Low with enable/disable option for all parameters.
Alarm is triggered for 5 consecutive readings over/under threshold.
Over Dosing ControlOver feed safety timer.
Analog Ouput Signal(BL122 only - 3) 4 to 20 mA, sourcing, configurable 
Output impedance ≤ 500 Ohm Accuracy < 0.5 % FS 
Galvanically isolated up to 50 V relative to earth
Digital Input SignalGalvanic isolated, powered contact type
Low level in acid/base tank (contact open)
Low level in chlorine tank (contact open)
Hold input (contact open)
Power Consumption10 VA
Multi-parameter ProbeHI1036-18XX (02, 05, 10, 15, 20 m of cable) pH/ORP/Temperature with matching pin combined digital probe
Logging TypeAutomatic Log of measurements (pH, ORP, Temperature) and events
Logging Memory60 days logging with 10 s period (or 100 logs)
Power Supply100 - 240 VAC
Environment0-50 ºC (32-122 ºF) Max 95% RH non-condensing
Dimensions245 x 188 x 55 mm (73 mm with pumps)
9.6 x 7.4 x 2.2” (2.9” with pumps)
Weight1700 g (60 oz)
pH ElectrodeHI1131B glass body pH electrode with BNC connector and 1 m (3.3’) cable (included)
EC/TDS ProbeHI76312 platinum, four-ring EC/TDS probe with and 1 m (3.3’) cable (included)
Temperature ProbeHI7662-T stainless steel temperature probe with 1 m (3.3’) cable (included)
Logging TypeAutomatic, Manual, AutoHold
Logging MemoryUp to 100 lots, 50,000 records max/lot; maximum 100,000 data points / channel
Logging Interval14 selectable between 1 second and 180 minutes
ConnectivityOpto-isolated USB
GLPyes (GLP Channel 1
Calibration Timeout Reminderyes
USP CompliantUSP Application
ProfilesUp to 10 (5 for each)
DisplayColor Graphic LCD 240 x 320 pixels, 8 keys capacitive touch keyboard
Power Supply12 VDC adapter (included)
Environment0 to 50°C (32 to 122°F; 273 to 323 K), RH max 95% non-condensing
Dimensions160 x 231 x 94 mm (6.3 x 9.1 x 3.7”)
Weight1.2 Kg (2.6 lbs)
Ordering InformationHI5522 is supplied with HI1131 pH electrode, HI7662-T temperature probe, HI76312 conductivity probe, HI76404W electrode holder, HI70004 pH 4.01 buffer solution sachet, HI70007 pH 7.01 buffer solution sachet, HI700601 electrode cleaning solution sachet (2), HI7082 3.5M KCl electrolyte solution (30 mL), 12 VDC power adapter and instructions.
Notes*Uncompensated conductivity (or TDS) is the conductivity (or TDS) value without temperature compensation.