The BL-121 Swimming Pool Controller is a complete system designed for maintaining swimming pool, hot tub, and spa disinfection water quality.
The controller is available in two versions:
- 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
- Inline system (BL-121-10) allows for direct installation of probe and chemical injection fitting into existing piping.
Multi-coloured LED indicators for dosing
Meter status and service
Real-time graph display
pH range:0.00 to 14.00pH
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: 1mVmV
Accuracy @ 25°C: +-5mVORP (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)
BL-121 uses a multiparameter digital HI-1036-1802 probe that incorporates pH, ORP and temperature sensors along with a matching pin. All readings are measured within the probe and the data transferred to the controller by a digital connection.
A digital connection and matching pin provide for stable, reliable measurement. Without these two components, electrical noise from recirculation pumps and ground loops can interfere, causing erratic readings and premature probe failure.
BL-121 has two built-in peristaltic chemical feed pumps that are proportionally controlled with adjustable flow rates. One of the pumps is used to dose acid while the other is used to dose chlorine. The effectiveness of the available Chlorine, as determined by ORP, is inversely related to the pH value of the water. A pool with a fixed concentration of chlorine will show a decrease in ORP as the pH of the water increases.
BL-121 also features a dosing consent feature that will not dose chlorine until the pH value is first corrected. It is possible to have a low ORP value even though there is sufficient chlorine. The dosing feature avoids this situation as well as preventing chemical wastage and having a higher chlorine concentration level than desired.
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