Floating electrode types and main differentiating features:
|
| SCHE 2/T/GR: |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm |
| SCHE 2/T/KL: |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm |
| SCHE 2/E: |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm |
|
SCHE 2/E (Variante ILS): |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm,
with alarm bridging contact for the event that
no or insufficient conductive liquid is present to ensure functioning of the floating electrode |
| SCHE 3/E: |
Floating electrode with conductive electrode with
3 electrode rods
for signalling 2 alarms |
|
|
SCHE 2/Ex-0  II 1 G
EEx ia IIC T6: |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm,
for use in Zone 0, 1 or 2 |
|
SCHE 2/Ex-1 II 2 G
EEx ia IIC T6: |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm,
for use in Zone 1 or 2 |
|
SCHE 2/Ex (Variante ILS)-0
II 1 G
EEx ia IIC T6: |
Floating electrode with conductive electrode with
2
electrode rods
for signalling 1 alarm,
with alarm bridging contact for the event that
no or insufficient conductive liquid is present to ensure functioning of the floating electrode,
for use in Zone 0, 1 or 2 |
|
SCHE 2/Ex (Variante ILS)-1
II 2 G
EEx ia IIC T6: |
Floating electrode with conductive electrode with
2 electrode rods
for signalling 1 alarm,
with alarm bridging contact for the event that
no or insufficient conductive liquid is present to ensure functioning of the floating electrode,
for use in Zone 1 or 2 |
|
SCHE 2/Ex
(Variante 3 tiges)-0 II 1 G
EEx ia IIC T6: |
Floating electrode with conductive electrode with
3 electrode rods
for signalling 2 alarms,
for use in Zone 0, 1 or 2 |
|
SCHE 2/Ex
(Variante 3 tiges)-1 II 2 G
EEx ia IIC T6: |
Floating electrode with conductive electrode with
3 electrode rods
for signalling 2 alarms,
for use in Zone 1 or 2 |
|
Areas of application
of the floating electrodes
Floating
electrodes are designed for use only in pits, reservoirs, pump
shafts, separator plants for light liquids (if not classified as Zone
0) or similar areas.
It should be noted that floating electrodes can only be used to
detect the presence of a layer of a light liquid which is not soluble
in water and which is not conductive on a surface of water (or another
conductive liquid which has a higher specific density than the respective
light liquid) which is sufficiently calm to allow phase formation.
The precondition for proper functioning of the floating electrodes
is, namely, that clear separation between the heavy conductive liquid
and the lighter non-conductive liquid to be detected is possible
in the various locations, such as pits, reservoirs, pump shafts, separator
plants or similar.
In analogy to DIN 1999 (separators for light liquids), the separation
of light liquids which are insoluble in water and which are non-saponifiable,
such as benzines, diesel and fuel oils as well as other oils of mineral
origin with densities up to max. 0.95, is proven. Functioning of the
floating electrodes is therefore ensured when used in closed surveillance
areas without discharges (pits, reservoirs, pump shafts) and in separator
plants in compliance with DIN 1999 for the listed media. Application
tests have shown that an alarm is activated if non-conductive liquids
have formed layers between approx. 3 mm and 10 mm on the heavy liquid
(e.g. water) to be monitored.
For all other application areas, a test must be performed prior
to the desired use to ascertain whether the phase formation and minimum
layer thickness of the non-conductive liquid required for exact functioning
can be achieved in the operating conditions in question (such as flow
parameters, possible dwell times of the light liquid to be detected
in the application site etc.).
In case of doubt, the installation conditions should be assessed
by an expert from JOLA or from a supervisory organisation to determine
whether the use of the floating electrodes is feasible.
In should also be noted that, although the floating electrodes can
generally be used in the respective temperature ranges specified in
the brochure, it is absolutely essential that both media are present
in light liquid form to ensure proper functioning which, for example,
is only assured with water with a temperature above 0° C.
|
