GLP Good Laboratory Practice (GLP) refers to a quality control function used to ensure uniformity of probe calibrations and measurements. GLP stores pH/ORP calibration information including date and time for pH/ORP sensors. Hold Input It is possible to connect a ºow switch mounted in-line or a mechanical relay that is connected to the recirculation pump power source to the hold input of these controllers. With no ºow or when no power is applied to the recirculation pump, the hold circuit will disable the dosing pumps. This will prevent any dosing of chemical when there is no movement of water in the system. Analog Outputs (BL121 and BL123) The BL121 and BL123 controllers o¨er three 4-20 mA outputs. Each output can be disabled or connected to an external recording device. Each of the three measured parameters (pH, ORP, and temperature) can be assigned to an analog output where the current signal will be proportional to the measured value. For more ºexibility and better resolution, the analog output can be scaled; users can dene any two points within a parameter range to correspond to the analog output span. For example, the controller assigns 0 pH to 4 mA and 14 pH to 20 mA as a default. The user can adjust the pH range to assign pH 6 to 4 mA and pH 8 to 20 mA. This adjustment allows better resolution in the range of interest. USB-C Connectivity For review and storage the users can easily transfer data to a PC using a ºash drive and the USB-C port. Ethernet Port for Hanna Cloud Connectivity (BL122 and BL123) Password Protected These controllers feature password protection that o¨ers restricted access to calibration, setup, and review of logged data. The password can be set and enabled/disabled during general setup of the instrument. 15 Process Instrumentation 15.27 www.hannainst.com | controllers
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