28
SITRANS F M
3. Project guidance
Max. ambient temperature as a function of tem-
perature of medium.
The transmitter can be installed either compact
or remote.
With compact installation the medium tem-
perature must be in accordance with the graph.
With remote installation, the cable length and
type described under "Technical data", chapter
2 must be used.
Compact/remote installation
IP 68 applications only
If the sensor is buried or permanently sub-
merged, the terminal box must be encapsu-
lated with silicon dielectric gel.
Mix the two components well and pour the
contents into the terminal box.
The material is a non-toxic, transparent, self-
healing gel which cures in approx. 24 hours at
approx. 25°C (77°F) (curing time will increase
by 100% per -10 °C).
The gel can be penetrated with test instru-
ments or be removed in case of cable replace-
ment.
The potting kit cannot be used for ATEX app-
lications.
Horizontal installation
Vertical installation
Suggestions for the direct
burial of MAG 3100 &
MAG 5100 W sensors
All the sensor data plate information and serial number should be recorded for each sensor prior
to burying. This will ensure correct matching with the SENSORPROM
®
unit.
The sensor should be potted to IP68 and suitable coil and electrode cables used prior to burying.
The use of pea gravel at least 300 mm (12 inch) all around the sensor. This provides some drainage and
also avoids caking the sensor with earth. It also helps to locate the sensor should excavation take place.
Before covering the pea gravel with earth we suggest the use of electrical cable identification tape
laid above the gravel.
The sensor should not be subject to heavy vehicles applying excessive weight above the sensor
or pipeline.
If MAG 3100 or MAG 5100 W sensors are buried
directly into the ground, the SENSORPROM
®
unit should be removed from the terminal box
on the sensor and relocated in the remote
transmitter prior to burying the sensor.
Ambient temp.
Temp.
of medium
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