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.
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
Communication & Security
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.
For review and storage the users can easily transfer data to a PC using a flash drive and the USB port.
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 Range||0.00 to 14.00 pH|
|pH Resolution||0.01 pH|
|pH Accuracy||±0.05 pH|
|pH Calibration||pH buffer calibration: Automatic, two points (4.01, 7.01, 10.01 pH)
pH process calibration: Single point, adjustable
|pH Temperature Compensation||Automatic -5.0 to 105.0 ºC (23.0 to 221.0 ºF)|
|ORP Range||±2000 mV|
|ORP Resolution||1 mV|
|ORP Accuracy||±5 mV|
|Temperature Range||-5.0 to 105.0 ºC (23.0 to 221.0 °F)|
|Temperature Resolution||0.1 °C (0.1 ºF)|
|Temperature Accuracy||±1 ºC (±1.8 ºF)|
|Dosing Control||Proportional feed using adjustable set point and adjustable proportional band.
Delay to start at power-on and overdosing protection using.
Over feed safety timer.
|Consent Relay||pH dosing interlocked with ORP|
|Alarm Relay Set Point||High and Low with enable/disable option for all parameters.
Alarm is triggered for 5 consecutive readings over/under threshold.
|Over Dosing Control||Over 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 Signal||Galvanic isolated, powered contact type
Low level in acid/base tank (contact open)
Low level in chlorine tank (contact open)
Hold input (contact open)
|Power Consumption||10 VA|
|Multi-parameter Probe||HI1036-18XX (02, 05, 10, 15, 20 m of cable) pH/ORP/Temperature with matching pin combined digital probe|
|Logging Type||Automatic Log of measurements (pH, ORP, Temperature) and events: alarms, errors, power-failed|
|Logging Memory||60 days logging with 10 s period (or 100 logs)|
|Power Supply||100 - 240 VAC|
|Environment||0-50 ºC (32-122 ºF) Max 95% RH non-condensing|
|Dimensions||245 x 188 x 55 mm (73 mm with pumps)
9.6 x 7.4 x 2.2” (2.9” with pumps)
|Weight||1700 g (60 oz)|