Spectra Watermakers Farallon 1800, Installation And Operating Manual

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Salinity Probe Calibration
Salinity is a measurement of dissolved solids in liquid: these solids will conduct electricity to
varying degrees. A special probe is used, with two electrical contacts in it, to determine the
resistance to the flow of electricity in the liquid. The higher the resistance, the lower the PPM
of dissolved solids.
In the Farallon systems, the salinity probe is located in a port on the bottom of the pump
module manifold. This way we can look at the salinity level of the product water before
deciding to either reject the water or accept it and divert it into the holding tank.
The salinity level in parts-per-million can be seen through the remote display.
Using a hand-held tester, note the salinity in parts per million (ppm) of your product water
after the unit has been running, be sure to calibrate the hand-held salinity meter as per the
manufacturer’s instructions.
The salinity circuit can be adjusted from the display in the Salinity Cal window, or from
Spectra software by adjusting the “Salinity Calibration” parameter. Increase the calibration
parameter to increase the salinity reading. Follow the programming instructions in the second
section of this manual for more detail on adjusting the parameters.
Cleaning the Salinity Probe
To remove the salinity probe for cleaning, use a wrench to unscrew the probe from the
manifold. Be careful not to put too much strain on the attached cable while unscrewing the
probe from the manifold. Use emery cloth or very light grit sandpaper to gently clean the
probes inside the white housing. Upon re-installation, it is necessary to use Teflon tape on the
salinity probe threads before re-installing to prevent leaks, again use caution when tightening
the probe so as not to damage the cable.