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Small Panel Mount Chlorine Controller

Compact Chlorine Controller CL7335

The CL7335 Chlorine controller offers prescision measurements of free chlorine / residual chlorine and a host of control options all within a compact housing.

Small Chlorine Controller Introduction

The model CL7335 is our small case chlorine 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 and designed for mounting in panels where space is at premium. The CL7335 is also available in a surface mounting enclosure.

With a large bright display, the current conductivity value on the CL7335 controller is easily visible, even in bright sunlight.

Despite the compact size of the small panel mount conductivity controller, the CL7335 has 2 x control relays offering High / Low operation with optional delay timers.  The CL7335 also has an alarm relay and an industry standard isolated 4-20mA output signal isolated into 600Ω.

The CL7335 is powered via a switch mode power supply, allowing a supply voltage of either 85 - 264 VAC 50 / 60Hz.

The CL7335 is designed for use in a number of applications including swimming pool chlorination, potable water applications and industrial disinfection / sanitisation processes, including pulp & paper and bottling plant operations.

Designed to work with either an open amperometric chlorine cell or our SZ283 Potentiostatic Chlorine Sensor, and when combined with our SZ283 the CL7335 is designed to measure Free Chlorine / Residual Chlorine, Chlorine Dioxide or Bromine.

CL7335 Chlorine Ranges

The CL7335 Chlorine controller is able to measure chlorine as either PPM or mg/L across the following ranges:-

Chlorine Measuring RangeResolution
0 - 2.000 PPM 0.001 PPM
0 - 20.00 PPM 0.01 PPM

As a sophisticated Chlorine Controller, the CL7335 can take an input from a temperature sensor to provide automatic temperature compensation across a user-configurable range from 0-3.5% of the measured value.

CL7335 Chlorine Controller with 4-20mA Output

The CL7335 has an industry standard 4-20mA output which correlates to the user selectable ranges.  This ensures that the 4-20mA will give an accurate output corresponding to the range, with 4mA being the lowest point, and the 20mA at the top of the selected range.

The 4-20mA output is isolated into 600Ω so that it is incredibly easy to connect to a PLC, Online Data Logger, digital Chart Recorder or other device.

CL7335 Chlorine Controller with Control Relays

The CL7335 has 2 x control set-points and 2 x control relays which can be independantly set to High or Low operation.  Each of the control relays includes a variable hysteresis and a delay timer which can be set from 0-100 seconds.

In addition to the control relays, the CL7335 has an alarm relay which is energised when the measured chlorine value is outside of the set parameters.

There is also a logic input on the CL7635 which takes a volt free contact closure input.  When activated the logic input isolates the output relays preventing them from energising.  The Logic Input can be connected directly to the alarm relay if required.

CL7335 Easy to use Chlorine Controller

The CL7335 is a simple to use Chlorine controller.

In addition there is a password locked configuration screen which allows the user to change the less frequently adjusted settings.

For routine calibration of the instrument, the Zero and Span of the instrument are easily adjustable with a quick and easy menu driven calibration procedure.

The measuring range in PPM or mg/L is clearly visible on the front panel of the instrument, as are the current status of the set-point 1 relay, and the set-point 2 relay.  In addition, the alarm relay status is clearly visible from the front of the instrument as is the logic input status.

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 CL7335 series of instruments is intended to be into a control panel or in the optional surface mounting enclosure.

CL7335 Chlorine Controller Specifications

  • Specifications


    Model No:- CL7335

    Chlorine Range:- 0 - 2.000 PPM (mg/L)

    Chlorine Resolution:- 0.001 PPM (mg/L)

    Chlorine Range:- 0 - 20.00 PPM (mg/L)

    Chlorine Resolution:- 0 - 0.01 PPM (mg/L)

    Supported Chlorine Sensors:- Polarographic, Open Amperometric, Potentiostatic

    Temp. Compensation:- 0-3.5% base 20°C / 25°C

    Temp. Compenstation Range:- 0°C to 50°C

    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:- ±1 PPM (mg/L)

    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


    • Chlorine controller for use in measuring free chlorine / residual chlorine, Chlorine Dioxide or Bromine accurately for a numerous water treatment, wet leisure or process applications.
    • Available as a surface mounting instrument or as a panel mounting instrument to integrate into your processes.
    • Easy to setup, install and use.
    • Bright display suitable for use even in bright sunlight.
    • Two control relays and an alarm relay with easy to configure set-points.
    • Alarm relay which is engaged when the dissolved oxygen value is out of parameter (e.g. above and below a desired range) which can be linked into the logic input.
    • Isolated 4-20mA current output isolated into 600Ω, which is ideal for data-logging or connecting to a PLC.
  • Data Sheets

    Data Sheets


More Information