pH Mini 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, it can be installed right next to tanks or vats. This versatile controller is ideal for a wide variety of applications, such as textiles, papers, photographic solutions, plating baths, chemicals and water treatment.
It 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 analog output for recorder connection. Two models are available, with different power supply input at 115/230 VAC or 12 VDC.
The BL 931700 is supplied with mounting brackets, transparent cover and instructions
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 set point value – contact closed – alkaline dosage; activated when reading falls below set point value
Set point Adjustable from 0.0 to 14.0 pH
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 See Chart
Dimensions 83 x 53 x 99 mm (3.3 x 2.1 x 3.9″)