Hanna Instruments Pool and Spa Controller BL-121-10

Hanna InstrumentsSKU: BL-121-10

Sale price£1,488.05

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The BL-121-10 Pool and Spa Controller offers automatic control of pH and Chlorine levels in swimming pools, hot tubs and spas. An inline system, it allows for direct installation of probe and chemical injection fittings into existing piping. Professional installation required.

BL-121 is a new high performance hygiene control system for swimming pools, hot tubs and spas. It combines quick and easy monitoring for pH, ORP and temperature together with automatic chlorine dosing.

The controller is available in two versions:

    • Inline system (BL-121-10) allows for direct installation of probe and chemical injection fitting into existing piping.
    • Optional bypass flow cell included (BL-121-20) - ease of maintenance enhanced by allowing calibration and maintenance of the probe without the need to shut down the recirculation pump

Key features:

Multi-coloured LED indicators for dosing
Meter status and service
USB Connectivity
Real-time graph display
Automatic logging
Programmable alarms
Password protection



pH range:0.00 to 14.00pH

pH Resolution: 0.01pH

pH Accuracy (@25°C: +-0.05pH

pH Calibration: pH buffer calibration automatic, two-point (4.01, 7.01, 10.01pH); pH process calibration: one-point, manual input

pH Dosing: Proportional with adjustable set point and proportional band; delay to start at power-on and overdosing protection

mV range: +-2000mV

mV Resolution: 1mV

mV Accuracy @ 25°C: +-5mV

ORP (mV) calibration: one-point, manual input

ORP Dosing: Proportional with adjustable set point and proportional band; delay to start at power-on and overdosing protection; pH dosing interlocked

°C range: -5.0 to 105.0°C

°C Resolution: 0.1°C°

C Accuracy @25°C: +-1°C

Temperature Compensation: automatic, -5.0 to 105.0°C for pH

Pump control: Automatic and manual modes; adjustable flow rate from 0.5 to 3.5L/h

Log feature: Automatic logging of pH, ORP, and temperature measurements, GLP and events including alarms, errors, and power failure; capacity for 60 days with 10 seconds sampling interval; all data.csv files are transferred by USB flash drive

Alarms: High and low with enable/disable option for all parameters; alarm is triggered when 5 consecutive readings are over/under threshold

Alarm System: Intuitive alert system based on LEDs; alarm filtering options; alarm relay control based on user set up

Password Protection: Set up, calibration and log recall options features are password protected

Storage interface: USB

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

Alarm Relay Output (1): SPDT 5A/230 VAC; activated by pH/ORP/temperature selectable alarm conditions

Analogue Outputs (3): 4 to 20mA, sourcing configurable; output impedance ≤ 500

Ohm; accuracy < 0.5 % FS; galvanically isolated up to 50 V relative to earth ground

Auxillary Inputs (2): Low level in acid/base tank (contact open); low level in chlorine tank (contact open); hold input (contact open)

Digital Probe input (1): Galvanic isolated digital input HI-1036-1802 pH/ORP/temperature/matching pin combined probe with DIN waterproof connector

Power supply:100-240 VAC

Power consumption: 10 VA

Environment: 0 to 50°C, max 95% RH non-condensing

Dimensions: 245 x 188 x 55 mm (73mm with pumps)

Weight: 1700g



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