pH controllers to monitor and control pH in process water or wastewater.


  • Automatic temperature compensation
  • Dual ON/OFF relays
  • Large LCD screen
  • Front panel adjustment

pH Controllers Description

Global Water’s pH Controllers are packaged in a 1/4 DIN panel mount controller box with dual SPDT Hi/Lo relays, manual set points and calibration potentiometers set into the front of the pH controller panel. The pH controllers feature an isolated 4-20 mA current output and an external pH/ORP select switch. The pH Controller’s display is a large 0.5 inch LCD screen. pH controller sensor connectors are a BNC input and spade lug screw type connector block. The pH Controllers require a Pt-100 ATC probe or a simulation resistor for temperature compensation.

Global Water’s pH Controllers are precise instruments for the measurement and control of pH and mV (ORP). Two output relays are provided on the pH Controllers for ON/OFF control. The pH Controller’s isolated 4-20 mA current output covers the input control range of 0 to 14 pH and 0 to 1400 mV. The pH Controller’s DIN housing allows each pH controller to fit into standard panel cutouts, while providing industrial weatherproof and environmental housings for your pH control system.

pH Controllers Specifications

pH Controller:
pH: 0 to 14.0 pH
mV: +1999 mV
pH: 0.01 pH
mV: 1.0 mV
pH (± digit): +0.01 pH
mV (± digit): ±0.1 % Controller Input Range:
Relay Outputs:
pH: 0 to 14.00 pH
mV: ± 1999 mV
Current Output:
pH: 0 to 14.00 pH
mV: 0 to 1400 mV
Relay Outputs:
Maximum rated load: 5 Amp at 115 VAC, 2.5 Amp at 230 VAC resistive load
Isolated 4-20 mA output
Range: Over input span Accuracy: 0.1% of span
Isolation voltage: 500 VDC minimum
Load Resistance: 550 Ohms minimum
Input Impedance: >1012 ohms
Temperature Compensation: Auto 0.0 to 100.0 °C
Temperature Sensor: PT-100, Alpha = 0.00385
Readout: ½” high LCD display
Power Source: 115 VAC, 230 VAC ± 15% 50/60 Hz
Dimension: 3.75×3.75×4.75 (96x96x119.3mm)
Weight: 2 lbs (0.77 kg)
Mounting: 1/4 inch DIN

pH Controllers Options

3675 pH Controller (PN# HB0100)
Does not include pH/Ref Electrode or ATC probe


600P pH Controller pH/Ref Electrode (PN# DO0010)
pH sensor: epoxy with BNC connector.  Comes with a 3 ft cable.  Max Temp. 60° C

600A-ST Pt-100 ATC probe, SS (PN# HB0110)
Banana Plugs, 30 inch cable.

600E-ORP pH Controller ORP Electrode (PN# DO0510)
ORP sensor: epoxy with BNC connector, Max Temp. 60° C, 3-ft cable.


3671 pH/ORP Controller

6309POT pH/ORP Controller

PC320 Temperature Controller

WQ Water Quality Sensors