Walchem WCT400 Instruction Manual download pdf (Page 19)

5.2 Conductivity Menu

The conductivity menu provides the following settings: Calibration, Self Test, Unit selection, and

sampling mode setup. Additional settings are also discussed below. Refer to figure 8, Conductivity

Menu Chart.

Calibrate

To Calibrate the conductivity, use either a hand held meter, or a buffer solution, and adjust the WCT controller to

match. Once Calibrate is entered, the unit continuously displays conductivity readings. Press an arrow key to change

the value displayed to match the hand held meter or the buffer solution. You must press ENTER to activate the new

calibration. You must press the EXIT key to exit calibration. The Bleed output is unaffected until the calibration

menu is exited, so if it was ON when you entered calibration it will stay on until you exit.

Self Test

Press ENTER to begin self test. Press any key to stop. Self Test internally simulates a conductivity sensor and

should always give the reading 1000 µS/cm ± 100 µS. If it does not, there is a problem with the electronics and unit

should be serviced. If the self-test is in the expected range, and there is a problem calibrating, then the sensor or its

wiring is at fault.

Units

You may choose to display conductivity in µS/cm or in ppm. Press ENTER and then use the Up and Down arrows

to change the units. If you change the units, you will be warned to check your settings. This is important. Set points

are not automatically translated from µS/cm to ppm. If you change the units you will need to change your Bleed

settings.

ppm C.F.

This is the ppm Conversion Factor (or multiplier). This is typically 0.666 but can be changed to accommodate

various requirements.

Sample

Mode C / I

Press enter to choose Continuous sampling or Intermittent sampling. A 'C' at the end of the display means that

sampling is continuous, while an 'I' indicates intermittent sampling. Use Continuous sampling with a traditional

bypass line installation of the conductivity sensor.

Choose Intermittent sampling to use the bleed solenoid valve for timed sampling of the conductivity.

Intermittent sampling installations read the conductivity at set intervals for a given sample duration. If the

conductivity is above the set point, the valve that controls the sampling will stay open until the conductivity falls

below the set point. If the time the valve stays open goes beyond the sample duration, the controller will display

Xtnd on the top status line, as well as the amount of time extended. A limit on this amount of time may be

imposed; see Figure 10 Bleed Menu.

Continuous

Intermittent

If Intermittent sampling is chosen, the Flow Switch input will be ignored, and the following two settings will

become available:

Interval

This sets the amount of time between samples. This is set in Hours:Minutes.

Duration

This is the length of each sample. This is set in Minutes:Seconds.

RawCond

This menu is for information only and displays the temperature-compensated conductivity reading before the user’s

calibration has been applied.

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Walchem WCT400 Instruction Manual Page 19

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