Because of the high-impedancenature of pH measurement, great
care is needed with the
electrical connections of the sensor and the
connected instrument amplifier /
controller. All contacts must be
gold-plated type. The 2-pole cap N type terminalhead for connection of the pH and
redox electrodes is now widely
used in Europe. There are versions
with or without Pg 13.5 male
thread. This cap system is also
known under the names S7 and S8
and has been tested in service over
many years. For multiparameter electrodes (e.g.combination of pH combination
electrode and
temperature probe or
with the JUMO Multitrode), JUMO
use several different cap systems.
The preferred type is the SixPlug
system (formerly designated
SMEK). The use of this system is
now firmly established with a
number of electrode manufacturers
as standard, and provides a reliable
electrode connection with IP68 protection. On the basis of NAMUR
recommendations, JUMO uses this
cap system as standard.
However, as a manufacturer of pH /
redox electrodes, JUMO also offers
customers other readily available
cap systems, such as the VP /
Variopin or the Variopol system.
Of course, JUMO can also supply
all sensors with a fixed cable
connection (with and without
Pg 13.5 thread).