Panel Mounted Conductivity Controller

Panel Mounted Conductivity Controller with a 2 x Control Relays and Isolated 4-20mA Output

The C7635 Conductivity Controller is available in either surface mounting or panel mounting configuration, with C7635 panel mounting and C7635-W in surface mount enclosure.

C7635 Conductivity Controller Introduction

The C7635 Conductivity Controller is a panel mounting Conductivity 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 at only 95mm allowing the controller to be mounted into compact sized control panels saving on both space and cost.

The easy to use C7635 Conductivity 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 simple process with the dedicated Zero and Sensitivity calibration buttons.

To ease the installation of the C7635 Conductivity Controller the instrument is fitted with a switch mode power supply, suitable for a supply voltage of 86- 264 VAC 50 / 60Hz.

The C7635 Conductivity Controller includes 2 x control relays for use in either high or low operation and an alarm relay which is operated when the conductivity reading is outside of parameter.

In addition the C7635 has a 4-20mA output isolated to 600Ω making it ideal for incorporation into BMS or PLC systems, as well as with an online Data Logger or with a digital Chart Recorder.

C7635 Conductivity Ranges

The C7635 Conductivity controller features selectable ranges for measurements in µS (micro-siemens) and mS (milli-siemens) over the following ranges:-

C7635 Small Conductivity Controller Temperature Compensation

Considering the importance of temperature on conductivity readings, the C7635 can work with a conductivity cell with integrated automatic temperature compensation, or with an external RTD Temperature measuring device.

The temperature compensation co-efficient of the C7635 is user selectable allowing the user to take more control of their process. The ATC co-efficient can be selected between 0-3.5% per ºC of the measured value against a base of either 20ºC or 25ºC.

C7635 Conductivity Controller with 4-20mA Output

The C7635 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 at 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 or to a digital Chart Recorder or other device.

C7635 Conductivity Controller Compatible Conductivity Cell Constants

The C7635 will work with any good quality AWE conductivity cell instruments, including our range of dip mounting conductivity cells and insertion conductivity cells.

Compatible cell constants for the C7335 include:-

• K=0.1
• K=1.0
• K=10.0

C7635 Conductivity Controller with Control Relays

The front panel of the C7635 includes 8 keys that allow simple navigation of the panel mounted conductivity controllers options. The Zero and Span for the calibration procedure are mounted on the front of the controller. In addition both set-points are identified with their own front mounted button, allowing their values to be easily changed.

The dedicated up/down arrows on the front of the controller allow for easy modification of either the calibration or set-point values decreasing initial setup time, or the time spent during periodic calibration or maintenance.

The 2 x set-points control 2 x control relays which can be set to high or low operation independently. 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 C7635 has an alarm relay which is energised when the conductivity value is outside of the set parameters.  

There is also a logic input on the C7635 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.

C7635 Easy to Operate Conductivity Controller

The C7635 is a simple to use conductivity 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 values are both easily adjustable with a quick and easy menu driven calibration procedure.

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

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 7635 series of instruments is intended to be into a control panel or in the optional surface mounting enclosure.