Technical Instructions for
Correlation Sensors
Page 56
Correlation Sensors – Rev. 07 as of 20.04.2016
®
6
Table of Resistiveness
WARNING
Damage due to aggressive media
As a basic principle, damage might occur in case of using chloride media (pit-
ting corrosion in stainless steel ground plate or sensor jacket), hydrogen sul-
phide (H
2
S – risk of diffusion through cable sheath or sensor body resulting in
destruction of copper wires and conductor paths) as well as various organic
solvents (may dissolve cable sheath or sensor body)!
Sensors and cables shall be installed exclusively in media according to the
table of resistiveness below.
Sensor installation and cable layout shall be executed exclusively in media
according to the table of resistiveness below! Otherwise the measurement sys-
tem may be damaged irreversibly.
The medium contacting parts of the sensors consist of:
-
V4A (ground plate or pipe sensor jacket)
-
PPO GF30 (sensor body)
-
PEEK (sensor crystal cover)
-
Polyurethane (cable sheath and glands)
-
PTFE (gasket of sensor screw joint)
-
PA GF30 (protective cover for wedge sensor type CS2)
The following materials are used additionally for sensors with pressure
measurement cell:
-
Hastelloy® C-276
-
Viton® (PA/PR)
The sensor technology is resistant to normal domestic sewages, dirt and rain
water as well as mixed water from municipalities and communities. Also in many
industrial plants (e.g. Huels, BASF etc.) the resistance does not present any
problems. The sensor technology nevertheless is not resistant to all substances
and substance mixtures.
Please observe that substance mixtures (several substances being present sim-
ultaneously) under certain circumstances may cause catalytic effects which
might not occur if the individual substances are in use. Due to infinitely possible
combinations these catalytic effects cannot be verified entirely.
If in doubt please contact your NIVUS representative and request a free material
sample for long time testing purposes.
For use in special applications with high aggressive or solvent-containing media
there are sensors made of full PEEK available with ground plates made of Has-
telloy or Titanium as well as pipe sensors made of high resistant special steel.
Sensor cables which have to be immersed into the medium are available with a
special FEP coating (resistant to organic solvents or hydrogen sulphide).
