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The BL121 Swimming Pool Controller is a complete system designed for maintaining swimming pool, hot tub, and spa disinfection water quality. The BL121 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 BL121 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.
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.
The BL121 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.
The BL121 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.
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.
With chlorine disinfection there is an inverse relationship between pH and ORP. As the pH level increases, the ORP level decreases. The
BL121 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.
An inline flow switch or a mechanical relay connected to the recirculation pump power source
may be connected to the hold input of the BL121. With no flow or when no power is applied to the recirculation pump, the hold
circuit disables the dosing pumps. This will prevent any dosing of chemical when there is no movement of water in the system.
The versatile display of the BL121 allows for three screen modes. The LCD can display all three parameters at one time, a 3-second cycle of single parameters, or a real-time plot screen with options for parameter selection, zooming, and log recall.
Hanna controllers allow users to
enable or disable the low and high level of alarms for all
parameters. When an alarm is activated, all dosing will stop.
The alarm system also offers overdosing protection if the value
is not corrected within a specified time interval then the
meter will go into alarm status.
The BL121 offers multiple LED
indicators for status, servicing, and pump operation. The
STATUS LED changes color based on operational state; green when
setting are in range, yellow when user intervention is
required, and red for problems. The SERVICE LED indicates any
alarms and process errors experienced by the controller.
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 BL121 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.
| Weight | 4.92 kg |
|---|---|
| Parameter | ORP, pH |
| pH Accuracy | ±0.05 pH |
| pH Calibration | 10.01 pH) pH process calibration: Single point, 7.01, adjustable, pH buffer calibration: Automatic, two points (4.01 |
| pH Range | 0.00 to 14.00 pH |
| pH Resolution | 0.01 pH |
| Temperature Accuracy | ±1 ºC (±1.8 ºF) |
| Temperature Range | -5.0 to 105.0 ºC (23.0 to 221.0 °F) |
| Temperature Resolution | 0.1 °C (0.1 ºF) |
| SKU | BL121-10 |
| Name | Swimming Pool Controller with Built-in Dosing Pumps, Analog Outputs and In-line Mounting Kit |
| 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) |
| Connectivity | USB |
| GLP | pH/ORP |
| 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) |
To empower customers to achieve quality
by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
To empower customers to achieve quality by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
To empower customers to achieve quality by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
