Hanna Instruments

Scientific Equipment

Safety Data Sheets

SDS search & quick download

Free Delivery

Most of mainland GB for orders over £50. Other charges may apply - see more

Hanna Care

We take the long view, looking after existing customers as much as delighting new ones!

Certificates of Analysis

Download a copy of the certificate of analysis for your solution

BL-931700-1 pH Mini Controller

BL-931700-1 pH Mini Controller

BL-931700-1 pH Mini Controller

BL-931700-1 pH Mini Controller

Use with HI-1001 or HI-2911B/5
2 year manufacturer warranty
In Stock
£296.30 (exc. VAT) £355.56 (inc. VAT)

BL-931700 mini pH controller has been designed for easy, affordable installation in tight spaces to perform simple yet effective process control. As a result of its compact size, BL-931700 can be installed right next to tanks or vats.

BL-931700-1 pH Mini Controller information

Hanna's extended description

This versatile controller is ideal for a wide variety of applications, such as textiles, papers, photographic solutions, plating baths, chemicals and water treatment.

BL 931700 is provided with a selectable set point for acid or basic dosage. Measurements are directly acquired from a pH electrode in the range from 0 to 14 with a 0.01 pH resolution. Accuracy is ensured by the 2 point calibration, performed manually through trimmers on the front panel.

You can also choose automatic or manual dosing mode with a switch on front panel. Manual control is particularly useful during maintenance operations, because it permits you to enable or disable the dosing relay according to your need.

The overtime control system advises you when the relay is active too long, helping to prevent overdosing. In addition, this model features a 4-20 mA analogue output for recorder connection.

Two models are available, with different power supply input at 115/230 Vac or 12 Vdc.

Order Information:

The BL 931700 is supplied with mounting brackets, transparent cover and instructions.

Mains powered - All mains operated equipment is compatible with UK AC voltage and frequency – 230V, 50Hz.

Interchangeable Electrode - One controller for all jobs thanks to HANNA’s wide range of interchangeable electrodes. Simply change the electrode for the task ahead.


Specifications list


Range - pH 0.00 to 14.00 pH
Resolution 0.01 pH
Accuracy - pH ±0.02 pH
Calibration manual, 2 point, with offset and slope trimmers
Dosing Relay 1, max 2A (fuse protected), 250 Vac, 30 Vdc
Dosing Selection acid or alkaline
contact open = acid dosage, activated when reading exceeds setpoint value
contact closed = alkaline dosage; activated when reading falls below setpoint value
Setpoint adjustable from 0.0 to 14.0 pH
Overtime adjustable, typically from 5 to approx. 30 minutes
Recorder Output 4-20 mA, accuracy ±0.20 mA, 500 Ohm max load
Input Impedance 102 Ohm
Power Supply 230 VAC; 50/60Hz
Dimensions 83 x 53 x 99 mm (3.3 x 2.1 x 3.9")
Weight 200g

Questions & Answers

Got a question to ask? Use this form to submit your question.
Question will be displayed after moderation.
Name* Product Question*
No questions yet?
Don 't be shy, be the first to ask.