Spectra Watermakers NEWPORT 400 Mk II, Installation & Owner'S Manual

Page: 37 / 62

37
Salinity Pr obe Calibration
Sa lin ity is a measurement of d is solved so lid s in liqu id : these so l ids wi l l conduct electricity to
varying de grees. A special probe is used, with two electrical conta cts in it, to d etermine the
resistance to the flow of electricity in the liqu id. The h i gher the resistance, the lower the P PM
of disso lved so lid s.
In the MkII systems, the salinity probe is located in a port on the bot tom of the fe ed pump
module plu mb in g man ifold. Thi s way we can look at the salinity level of the product water
before deciding to either reject the wa ter or a ccep t it and divert it into the holdin g tank.
The sal inity level in parts - per - m il l ion can be seen either through the salin ity meter in the soft-
ware, or on the display.
The next step is to de cide what medium to use as calibration solution. If a hand - held salin ity
meter is available, you can simply take a r eading of your produc t wat er while the unit is run-
nin g, then c alibrate our M PC board to match tha t re ading. As lon g as you trust th e a ccura cy of
your hand - held meter, this is a ll that is necessary.
The microprocessor calculates sal inity from the si gnal s sent back to it from th e probe. The
salin ity circuit can be adjusted from the Spectra software by adjustin g the “Salin ity Calibra-
tion” parameter, or from the display in the Sa lin ity Cal w indow. Increase the calibration pa-
rameter to increase the salinity readin g.
Conductivity calibration so lutions are available fro m Spectra Wa termakers if another method
of calibration is necessary. These solution s are pre - made pot assium chlor ide so lutions w ith
known salin ity levels. Calibration cons ists of insertin g our probe into the solution and se tting
the calibration parameter to the required v alue.
To remove the sal in ity probe, unplu g the telephone style cable from the probe. Use a wrench
to unscrew the probe from the manifold. Re - connect the salinity probe cable, and you are
ready to calibrate. Place th e flat surface of th e probe cont ainin g the two metal conductivity
contac ts into the calibration solut ion bein g careful not to get the cable or jacks wet. Upon re -
instal lation, it is recom mended to use Teflon tape on the sal inity probe threads before re -
instal lin g to prevent leaks. We also recom mend puttin g so me s i licone grease in side the jack, to
prevent moisture from causin g corros ion in side the jack.
*NOTE : If the system was manufactured a fter April, 2008 the system wi l l use A - 34 software
or later. Thi s software revis ion requires a sal inity probe that is hardw ired at the probe end, and
cannot be disconnec ted. Use caution when removin g the probe so the cable is not damaged.