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pH and ORP Controller with ethernet for remote cloud monitoring (no analog output) - BL122

All prices are VAT excluded and without shipping costs, unless otherwise stated.

Designed to maintain constant pH and disinfectant levels in swimming pools, hot tubs, and spas, the BL122, and BL123 pH and ORP controller offers the added benefit of allowing remote connection and access to devices via the Hanna Cloud web app.

  • Keep track from anywhere with Hanna Cloud connectivity.
  • Inline or panel mounted models.
  • Built-in datalogger for compliance monitoring

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pH and ORP Controller

Peristaltic Chemical Feed Pumps

Equipped with two peristaltic dosing pumps with replaceable chemical resistant tubing that are proportionally controlled with adjustable flow rates.

Automatic Proportional Pump Control

Adjust the proportional band based on the sensitivity of your process to chemical addition, finetuning the amount of time that the pumps are dosing.

Adjustable Flow Rate

The dosing pump flow rate is adjustable from 0.5 to 3.5L/h, allowing for better control in maintaining a desired set point.

Programmable Alarm System

Set low and high alarm levels for all parameters. When an alarm is activated, all dosing will stop to prevent overdosing.

Automatic Logging

Readings are automatically logged every 10 seconds. Logged data includes pH, ORP, and temperature values, last calibration data, setup configuration, and any event data.


GLP stores pH/ORP calibration information including date and time for pH/ORP sensors.

Password Protected

Password protection restricts access to calibration, setup, and review of logged data for increased security.

3 Display Modes

The LCD can display all 3 parameters at one time, a 3-second cycle of single parameters, or a real-time graph.

Keep Track Anywhere with Hanna Cloud Connectivity

Hanna Cloud is a web-based application that connects you to measurement devices such as the BL122 and BL123. Measurements and data storage are accessible from your PC, tablet or phone. Measurements, trends, history, device settings, alarms, and messages are transmitted to your “Dashboard” as your instrument measures and controls your process.



Measurement & Graphing

Measurement, alarm, hold and pump status are easily viewable. Use a graph to view trends over the last 12 hours or change the time period. Log history can be transferred as a PDF or .CSV.

Good Laboratory Practices (GLP)

Good Laboratory Practice (GLP) refers to a quality control function used to ensure uniformity of probe calibrations and measurements. GLP data is readily available for increased traceability. 


Select which notifications you would like to receive. Multiple secondary users may also be added to your device account to monitor measurements and receive email or pop-up messages from your process device. 


Specification NameDetail
Product namepH and ORP controller BL122/BL123
pH Range0.00 to 14.00 pH
pH Resolution0.01 pH
pH Accuracy (@25°C/77°F)±0.05 pH
pH Dosingproportional with adjustable set point and proportional band; delay to start at power-on and overdosing protection
ORP Range±2000 mV
ORP Resolution1 mV
ORP Accuracy (@25°C/77°F)±5 mV
ORP Dosingproportional with adjustable set point and proportional band; delay to start at power-on and overdosing protection; pH dosing interlocked
Temperature Range-5.0 to 105.0°C (23.0 to 221.0°F)
Temperature Resolution0.1°C (0.1°F)
Temperature Accuracy (@25°C/77°F)±1°C (±1.8°F)
Temperature Compensationautomatic, -5.0 to 105.0°C (23.0 to 221.0°F) for pH
CalibrationpH buffer calibration: automatic, two-point (4.01, 7.01, 10.01 pH) pH process calibration: one-point, manual input
Pump Controlautomatic and manual modes; adjustable flow rate from 0.5 to 3.5 L/h
Log Featureautomatic logging of pH, ORP, and temperature measurements, GLP and events including alarms, errors and power failure; capacity for 60 days with 10 second sampling interval; all data .csv files are transferred by USB flash drive
Alarmshigh and low with enable/disable option for all parameters; alarm is triggered when 5 consecutive readings are over/under threshold
Alarm Systemintuitive alert system based on LEDs; alarm filtering options; alarm relay control based on user setup
Password Protectionsetup, calibration and log recall options features are password protected
GLPpH/ORP calibration information including date and time for pH/ORP sensors
Alarm Relay OutputSPDT 5A/230 VAC; activated by pH/ORP/temperature selectable alarm conditions
Analog Outputs4 to 20 mA, sourcing, configurable; output impedance ≤ 500 Ohm; accuracy < 0.5 % FS; galvanically isolated up to 50 V relative to earth ground
Auxiliary Inputslow level in acid/base tank (contact open); low level in chlorine tank (contact open); hold input (contact open)
Digital Probe Inputgalvanic isolated digital input HI1036-1802 pH/ORP/temperature/matching pin combined probe with DIN waterproof connector
Power Supply100 — 240 VAC
Power Consumption10 VA
Environment0 to 50°C (32-122°F); 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.)

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