YOKOGAWA SC450G - Page 69

IM 12D08N05-01E
APP-3
<APPENDIXES>
• Checking
Whenthetemperaturecoefcientalreadysetisaccurate,theconductivitytobedisplayed
must be constant regardless of liquid temperature. The following check will make sure that
thetemperaturecoefcientalreadysetisaccurate.
If, when the liquid temperature is lowered, a larger conductivity value is indicated, the
temperaturecoefcientalreadysetistoosmall.
The opposite also applies. If a smaller conductivity value is indicated, the temperature
coefficient already set is too large. In either case, change the temperature coefficient so
that the conductivity no longer changes.
n
 Matrixcompensation
The compensation matrix is a table of temperature and conductivity values at differing
concentrations. These values are used to calculate the temperature compensation
applicable for a particular solution. Choose the component that you will be measuring in
your application, and where appropriate the concentration range. SC450G will do the rest.
Byfollowingtherouting:
Commissioning>>Measurementsetup>>Temp.compensation>>Matrix
you gain access to the Matrix selection area.
Matrices are available for the common mineral acids and bases. In addition Ammonia and
Morpholine are included.
In short by using the matrix method, specialist compensation is available for the majority
of applications in the power industry, water treatment, and chemical manufacturing.
The following matrices are available initially, but as with all Yokogawa products, we are
continually striving to improve both the quality and technological content. Further solutions
will be added to this list.
Selectmatrix Concentration Temperature
Ammonia 0..50 ppb 0 to 50 ppb 0 to 90 ºC
Morpholine 0..500 ppb 0 to 500 ppb 0 to 90 ºC
Ammonia15..30% 15to30% 10 to 50 ºC
Sulfuricacid0..27% 0to27% -1.1 to 98.9 ºC
Sulfuricacid39..85% 39to85% -17.8to115.6ºC
Sulfuricacid93..100% 93to100% 10 to 90 ºC
NaOH0..15% 0to15% 0 to 100 ºC
NaOH25..50% 25to50% 0 to 80 ºC
HCl 0..200 ppb 0 to 200 ppb 0 to 100 ºC
HCl0..18% 0to18.2% -10 to 65 ºC
HCl24..44% 23.7to43.8% -20 to 65 ºC
HNO
3
0..25% 0to24.80% 0 to 80 ºC
HNO
3
35..88% 35.0to87.7% -16 to 60 ºC