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Small pH Controller with 2 control relays and 4-20mA output

p7335 ph controller

The model P7335 is our small case pH controller and is a member of our series 7335 analytical instruments. The 7335 series are housed in 48 x 96 din standard enclosures which are only 95mm deep, designed for mounting in panels where space is at a premium.

The P7335 pH/Redox (ORP) millivolt controller features selectable ranges for pH with a glass electrode, as well as pH using an Antimony electrode which maybe used in solutions containing HF acid and also Redox (ORP) millivolts over the range of - 1000 mV to +1000 mV.

Temperature compensation maybe manually set over the range of 0–100ºC or automatically compensated for over the range of 0-100ºC by the use of either a Pt100 or Pt1000 temperature sensor which is user selectable. A bright red LED indicates the selected parameter pH or mV, the main readout features a 4 digit red LED display, which provides excellent visibility and provides the user with messages for setup and operation.

The front panel includes 4 keys that allow the user to access the most frequently used functions. Two programmable control relays are fitted, the control relays can be programmed for either high or low operation and have adjustable delay timers. One adjustable alarm relay with delay timer is fitted which maybe set to operate on both a high and low measured value.

The isolated current output corresponds to the measuring range selected and can be selected for either 0-20mA or 4-20mA. The versatility of the microprocessor accompanied by the user friendly software allows the programming of the functions, routine checks and calibration to be easily accomplished even by untrained operators. Installation of the 7335 series of instruments is intended to be in a control panel or in the optional surface mounting enclosure.

The rear of the case is fitted with removable connector blocks for ease of installation and maintenance.

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

The P7335 small size 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 most commonly used with a PLC or Chart Recorder.

  • Specifications


    Model No:- P7335

    pH Range:- 0-14.00 pH

    Redox Range:- -1999 to +1999 mV

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

    Temp. Range:- -0ºC to 100ºC

    Input:- pH electrode, Antimony pH electrode,

    Redox Electrode

    Set Points:- 2 Min / Max selectable, contact SPST, 5 Amp inductive

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

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

    Zero:- ±2.00pH

    Slope:- 80%-110%

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

    Power Consumption:- 6 VA

    Weight:- 400 grams DIN version

    Dimensions:- 48 x 96 x 95mm cutout 45 x 92mm

  • Features


    • Small Sized pH controller for fitting in existing control panels
    • Precision pH and Redox monitoring for process and effluent applications
    • Easy to setup, install and use
    • Bright display for dark installations
    • Two control alarm relays for process control which work in any combination of above or below a desired set-point
    • Alarm relay which is engaged when the pH / Redox value is out of parameter (e.g. above and below a desired range).
    • Isolated current output for data-logging and PLC based applications
  • Data Sheets

    Data Sheets


More Information