BL-121-20 POOL AND SPA CONTROLLER
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BL-121-20
BL-121-20 includes all the advantages of the BL-121-10 as well as an optional flow cell for ease of maintenance. The bypass flow cell allows for calibration and maintenance of the probe without the need to shut down the recirculation pump. Ideal for swimming pools, hot tubs and spas.
BL-121 Pool and Spa Controller
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.
Key features:
- Multi-coloured LED indicators for dosing
- Meter status and service
- USB Connectivity
- Real-time graph display
- Automatic logging
- Programmable alarms
- Password protection
More information:
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.
HI-1036-1802 Multiparameter Digital pH, ORP, Temperature Probe
HI-1036-1802 is a digital probe that measures pH, ORP, and temperature. This probe also incorporates a potential matching pin. The matching pin is considered the ‘earth ground’ connection and is used to prevent ground loop effects from causing erratic readings and damage to the system.
pH glass has been chosen to produce stable quick equilibration even in low conductivity waters. Additionally, the pH sensor is designed to produce a mV value near pH 4 (not pH 7 like typical sensors) should it stop working. A broken pH electrode that produces mV value near pH 7 would produce an alarm state and disable any pump activated.
The ORP sensing surface is a large smooth surfaced platinum band that encircles the circumference of the temperature probe. It is referenced to Ag/AgCl reference electrode (3.5M KCI).
The ORP and pH sensors and reference electrode all use a differential measurement technique designed to deliver accurate results under adverse conditions that may cause conventional pH probes to produce erroneous measurements.
The HI-1036-1802 probe with its differential amplifiers greatly reduces inaccuracies caused by ground loops which may exist between process and instrument grounds. With the differential technique, a ground loop current flows through the low impedance path of the matching pin and provides immunity to the measurement signals. In addition, the probe converts these measurements to a digital signal to eliminate noise and static due to high impedance signals carried by cable.
Both the HI-1036-1802 and the BL-121 Pool controller promote the health and safety of pool and spa water.
Liquid Crystal Display
A versatile display allows three display modes. The LCD can display all three parameters at once, a 3-second cycle of single parameters, or a real-time plot screen with options for parameter selection, zooming, and log recall.
Datalogger
For compliance monitoring, the BL-121 has a built-in datalogger. Measurement readings are logged every 10 seconds with a new log starting each new day or when the instrument is calibrated. Logged data include pH, ORP, and temperature values, last calibrated data, setup configuration, and any event data.
Analogue outputs
Three 4-20 mA analogue outputs are available for users that wish to connect to an external chart recorder or datalogger to monitor any of the three measured parameters. The outputs are scalable, offering increased flexibility and better resolution as needed.
Additional features
Additional features of the BL-121 include LED indicators for dosing, meter status and service, real-time graph display, programmable alarms, and password protection.
Liquid Crystal Display - A versatile display allows three display modes
The digital probe measures pH, ORP, and temperature. This probe also incorporates a potential matching pin.
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| Specifications | BL-121 models | |
| 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 | |
| Ordering Information | ||
| BL-121-10 | In-line configuration BL-121-10 is supplied with BL-121 swimming pool controller, HI-1036-1802 pH/ORP/temperature digital probe with matching pin, 50 mm probe saddle (1), fitting for probe, chemical injectors (2), 50 mm saddle for injectors (2), peristaltic tubing (2), 5m of injection tubing, aspiration filter (2), 20ml sachets containing pH 7.01 buffer (3), 20ml sachets containing pH 4.01 buffer (3), 250ml bottle of 470mV test solution, power cable and instruction manual. | |
| BL-121-20 | User Panel Flow Cell Configuration BL-120-20 is supplied with BL-121 swimming pool controller, panel mounted flow cell, HI-1036-1802 pH/ORP/temperature digital probe with matching pin, 50mm probe saddle (1), fitting for probe, chemical injectors (2), 50mm saddle for injectors (2), peristaltic tubing (2), 5m of injection tubing, aspiration filter (2), 20ml sachets containing pH 7.01 buffer (3), 20ml sachets containing pH 4.01 buffer (3), 250ml bottle of 470mV test solution, power cable and instruction manual. |
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