Mini pH Controller

SKU : e676a1bdecbd

The BL981411 is a compact, pH process 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
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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.




Specification NameDetail
pH Range0.0 to 14.0 pH
pH Resolution0.1 pH
pH Accuracy (@25°C/77°F)±0.2 pH
Calibrationmanual, through CAL (offset) trimmer
Dosing Relaymaximum 2A (fuse protected), 250 Vac, 30 VDC
Dosing Selectionacid or alkalinecontact open=acid dosage=relay ON if measurement > setpointcontact closed=alkaline dosage=relay ON if measurement < setpoint
Setpointadjustable from 0 to 14 pH
Overtimeadjustable, typically from 5 to approximately 30 minutes
Input Impedance10^12 Ohm
Power SupplyBL981411-0: 12 VDC adapter (included);BL981411-1: 115/230 VAC; 50/60Hz
Dimensions83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’)
WeightBL981411-0: 200 g (7.1 oz.);BL981411-1: 300 g (10.6 oz.)
Ordering InformationSupplied with mounting brackets, transparent cover and instruction manual.
Recommended ProbeHI1001 PVDF body pH electrode with 1/2” NPT thread, BNC connector and 3 m (9.8’) cable for continuous flow-thru monitoring (not included).