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Panel Mounted Redox Controller with 2 Control Relays and 4-20mA output

p7635 Redox Controller with 2 control relays

The P7635 Redox Controller is available in either surface mounting or panel mounting configuration, with either a P7635 panel mounting or P7635-W in surface mount enclosure.

P7635 Redox Controller Introduction

The P7635 Redox Controller is a panel mounting Redox controller with a large bright red LED digital display in a DIN spec housing 96 x 96mm and is designed for the DN 47300 standard. This instrument also has a very short case length of only 95 mm allowing the controller to be mounted into compact sized control panels, saving on both space and cost.

The easy to use P7635 Redox Controller has 8 buttons located on the front, for easy access to the setup, configuration and calibration areas of the software. This allows the instrument to be easily setup and configured and makes periodic calibration a breeze with the dedicated Zero and Sensitivity calibration buttons.

To ease the installation of the P7635 Redox Controller the instrument is fitted with a switch mode power supply suitable for a supply voltage of 86-264 VAC.

Redox or pH measurement and control

The P7635 can be selected for use with Redox probes or pH probes. The range of the instrument is from -1000mV to +1000mV for the measurement of Redox (ORP). For the measurement of pH, this is across the full 0-14.00 pH scale. When measuring pH the P7335 has temperature compensation which may be manually set, over the range of 0-100ºC or automatically compensated for over the 0-100ºC. The Automatic Temperature Compensation is through the use of either temperature sensor, which can be mounted inside the pH electode.

When measuring or controlling the Redox value we strongly recommend pairing the P7335 Redox controller with an AWE Redox electrode or another good quality electrode.

Redox Controller with On/Off Control Relays and Alarm Relays

The P7635 is fitted with two programmable On/Off control relays. These can be programmed for either high or low operation and have adjustable delay timers. The on/off control relays are SPST 5 amp non inductive. Within the instrument, a mV (Redox / ORP) value can be assigned as a setpoint (such as a value of 500mV). When the Redox value is below this point, a control relay will switch, allowing a dosing pump to activate or a normally closed solenoid valve to open.

In addition to the On/Off control relays, the P7635 includes an SPDT 5 amp non-inductive alarm relay with adjustable delay timer. This can be set to operate on both a high and low measured value. The alarm relay is often used to control an audible alarm and/or control beacon.

4-20mA output for use with PLC's and Chart Recorders

The P7635 pH Controller has an isolated current output which corresponds to the measuring range selected (either pH Control or Redox Control) and can output either a 0-20mA or a 4-20mA signal. The current output is non-expandable and is often used with a PLC or Chart Recorder.

  • Specifications


    Model No:- P7635

    Redox Range:- -1999 to +1999 mV

    pH Range:- 0-14.00 pH

    Temp. Compensation:- Manual or Auto via 3 wire PT100 or PT1000

    Temp. Range:- -0ºC to 100ºC

    Input:- Redox Electrode, pH electrode, Antimony pH electrode

    Set Points:- 2 min / max selectable, contacts SPST, 5 amp inductive

    Action:- On/Off with delay timer of 0-100 secs

    Current output:- 0-20 / 4-20mA isolated into 600Ω

    Zero (Redox):- ±100mV

    Zero (pH):- ±2.00pH

    Slope:- 80%-110%

    Mains Supply:- 85-264 Volt, 50/60Hz switch mode power supply

    Power Consumption:- 6 VA

    Weight:- 500 grams DIN version

    Dimensions (Panel Mount):- 96 x 96 x 95mm cutout 92 x 92mm

  • Features


    • Precision Redox controller with a short case length for panel mounting.
    • Also available in a surface mounting configuration for stand alone Redox or pH Control applications
    • When paired with a good quality Redox or pH electrode, the P7635 boasts unparalleled accuracy, designed specifically for Redox and pH monitoring for process and effluent applications.
    • Easy to setup and install even for untrained engineers.
    • Bright display for dark installations.
    • ± 1mV Redox hysteresis banding and dual set points for control applications
    • Powered and isolated 4-20mA current output for data-logging and PLC based applications.
  • Data Sheets

    Data Sheets


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