Hanna Instruments Mini pH Controller with Analogue Output, Panel Mount, 115/220 V (BL931700-1)

Hanna Instruments mini pH controller with analogue output, panel mount, 115/220 v (BL931700-1)

The BL931700-1 is a compact panel-mount pH controller from the Hanna Instruments BL931700 mini controller series, used to monitor and regulate pH in commercial pool and water-treatment installations. It measures pH from a connected electrode, drives dosing equipment on setpoint and provides an analogue output signal for logging or transmission to a building or plant control system. It is supplied for 115/220 V mains operation.

What it fits

This unit belongs to the Hanna Instruments BL931700 mini controller family and is intended for pH control loops on pool filtration and chemical dosing skids. It works with standard pH electrodes and is typically paired with a chemical metering pump for acid or base dosing. The analogue output version allows the measured pH value to be passed on to a data logger, PLC or SCADA system.

Installation position

The controller is designed for panel mounting, so it is cut into the front plate of a dosing cabinet or control panel rather than wall-mounted separately. The pH electrode is installed in the sample line or measuring chamber downstream of the filter and connected back to the controller. Mains wiring is arranged for 115 V or 220 V supply according to the installation; connection work should be carried out by a qualified electrician.

Service and replacement

The controller itself is a long-life electronic instrument and normally outlasts the wear parts in the dosing loop. Measurement accuracy depends far more on the condition of the pH electrode, which ages and needs periodic calibration and eventual replacement. Replace the controller only if the display, relay switching or analogue output no longer performs correctly.

Ordering notes

This is the analogue output variant of the BL931700 series, so confirm that your installation actually needs a signal output before ordering. The unit is sold individually and not as a complete dosing kit; electrode, holder, injection fitting and pump are ordered separately. Check the required supply voltage against your panel before installation.