Mini pH Controller BL981411

In stock
The BL981411 is a compact, pH controller designed for applications where space or cost is important. The device contains a high impedance pH input and may be used with any pH electrode with a standard BNC connector. It’s adjustable dosing relay may be configured to dose above or below a user programmable pH setpoint. Users may choose from automatic or manual dosing modes allowing for easy maintenance and troubleshooting.
  • Large Clear LCD
  • Fire Retardant Casing
  • BNC Connection


Adjustable Dosing Relay

The BL981411 features a dosing relay which may be configured to dose above or below a user programmable pH setpoint.

Selectable Overdose Protection

The mini controller may be programmed to deactivate a valve, pump, or connected device if its activation continues over a selected time; adjustable from 5 to 30 minutes.

Selectable Control Override

With the flick of a switch, normal “Auto” operation may be overridden turning your connected device “Off” from operation or always “On.” 




Fuse Protected Dosing Contacts

The mini controller is protected for up to a 2A load from a connected pump or device.

Easy Peripheral Connection

Quick-connect terminal blocks provide for easy connection to power, communication, dosing control, or sensors.

Matching Pin Connection

An included matching pin option helps protect the sensor from ground loop effects that may lead to erratic readings or system damage. 


Front View

Installation cut-out dimensions are provided as well as outside panel dimensions. 



Side View

Adjustable location brackets allow the controller to slide easily and securely into place.




 pH Range

0.0 to 14.0 pH


0.1 % pH


±0.2 pH


manual, 1 point through CAL (offset) trimmer

Dosing Relay

maximum 2A (fuse protected), 250 Vac, 30 VDC

Dosing Selection

acid or alkaline contact open=acid dosage=relay ON if measurement > setpoint contact closed=alkaline dosage=relay ON if measurement < setpoint


adjustable from 0 to 14 pH


adjustable, typically from 5 to approximately 30 minutes

Input Impedance

10¹² Ohm

Power Supply

BL981411-0: 12 VDC adapter (included); BL981411-1: 115/230 VAC; 50/60Hz


83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’)


BL981411-0: 200 g (7.1 oz.); BL981411-1: 300 g (10.6 oz.)

Ordering information

BL981411-0 (12 VDC) and BL981411-1 (115V) are supplied with mounting brackets, transparent cover, and instruction manual.