IM 12D08N05-01E
APP-8
<APPENDIXES>
SC4A-S(T)-XX-010......
cc = 0.1 cm
-1
2-electrode sensor
This sensor is a good choice for clean water measurements. From 0.5µS/cm up to 200µS/
cm this is a good choice. The measuring range extends to 2000µS/cm, but there are better
choices in that range. The “SC4A-” sensors make up a range that uses compression
adapters or specialized fittings, including retractable.
SC42-EP15(D)
cc = 1 cm
-1
2-electrode sensor
This sensor is intended as a handy, short sensor. It is easy to fit in a branch (tee) on
a pipeline, and is good for measurements where the precision is less critical than a
convenient installation. The D version is particularly suited to food applications because of
it’s cleanability. Range of application is from 10µS/cm to 10mS/cm.
SC42-EP14
cc = 1 cm
-1
2-electrode sensor
Clean cooling and process water applications are where this sensor is used. The best
range of application is 10µS/cm to 10mS/cm. It is better suited to flow through installations
in FS40 and FF40 adapters and fittings, but it can also be used in dip tubes - FD40.
SC42-EP18
cc = 1 cm
-1
4-electrode sensor
Cooling and process water applications are where this sensor is used, including light
fouling. The best range of application is 100µS/cm to 100mS/cm. The four-electrode
system copes with some contamination from the process, and eliminates the tendency for
polarization to occur at the higher conductivity. It is better suited to flow through installations
in FS40 and FF40 adapters and fittings, but it can also be used in dip tubes - FD40.
SC42-EP04
cc = 10 cm
-1
2-electrode sensor
This sensor is in the program for historical reasons. It makes little sense to select this
sensor for new applications.
It was used mostly for process water and light process solutions. The operating range can
be 1to 100 mS/cm with higher readings having a very high risk of polarization. The SC42-
EP18 or the SC42-EP08 (4-el sensors) covers these ranges with much greater certainty of
avoiding polarization.
SC42-EP08
cc = 10 cm
-1
4-electrode sensor
Process applications are where this sensor is used, including light fouling. The best range
of application is 1mS/cm to 500mS/cm. The four-electrode system copes with some
contamination from the process, and eliminates the tendency for polarization to occur at the
higher conductivity. The upper limit is determined more often by chemical compatibility. The
epoxy material is attacked by many of the chemicals that are present in high conductivity
solutions. It is better suited to flow through installations in FS40 and FF40 adapters and
fittings, but it can also be used in dip tubes - FD40.
SC42-TP08 (FP08)
cc = 10 cm
-1
4-electrode sensor
These sensors are for extreme applications. The PTFE or the PVDF used for the body of
the sensor gives good chemical resistance for the strongly corrosive applications. These
sensors are intended for use in ranges 10mS to 1000mS/cm. Careful selection of the
holder is needed. The PVDF sub-assembly is an obvious choice for the SC42-FP08, and
the PP flow fitting often has sufficient corrosion resistance for the application. In any case
selection must be done with due regard to the process conditions.
The 2-electrode versions (SC42-T(F)P04 do exist, but like the epoxy version (SC42-EP04)
they should be discounted for new applications.
