Balluff BMD 1L Series, User Manual

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16 ÏÏÏƖº¹ÄÄÍŰƖ»ÇÅ
4 Mounting
54425-EN-170712
in chapter " Technical data ". Keep in mind for the adjustment that the
default setting for the measuring range refers to water.
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the vessel. Before use, check if the seal material is resistant against
the measured product and the process temperature.
À½Å¹ÐƖȽÊÅÁËËÁºÄ½ÈʽËËÍʽÁËËȽ»ÁŲ½¼ÁÆ»À¹È̽Êͷ Technical
data " or on the type label of the sensor.
Standpipes or bypass tubes are normally metal tubes with a diameter
of 30 … 200 mm (1.18 … 7.87 in). Up to a diameter of 80 mm (3.15
in) such a tube corresponds to a coax measuring probe. Lateral inlets
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Measuring probes can be mounted in bypass tubes up to DN 200.
For bypass tubes, select the probe length such that the blocking
distance (dead band) of the probe is above and below the lower
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complete range of the medium in the bypass tube (h). When design-
ing the bypass tube, keep the blocking distance of the probe in mind
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opening accordingly.
Microwaves can penetrate many plastics. This is why plastic tubes are
problematic for measurement applications. If durability is no problem,
we recommend the use of uncoated metal standpipes.
When the BMD 1L is used in bypass tubes, contact with the tube wall
must be avoided. We recommend for this purpose a cable probe with
centering weight.
Caution:
When mounting, make sure that the cable is straight over its entire
length. A kink in the cable can cause measurement errors and contact
with the tube.
With rod probes, a spacer is generally not required. However, if there
is a risk of the rod probe being pressed against the tube wall by in-
ŴÇÏÁƿŽ¼ÁÍÅƓÑÇÍËÀÇÍļÅÇÍÆ̹Ëȹ»½Ê¹ÌÌÀ½ÈÊǺ½½Æ¼ÌǹÎÇÁ¼
contact with the tube wall. In the case of cable probes, the cable can
be strained.
Keep in mind that buildup can form on the spacers. Strong buildup
»¹ÆÁÆŴͽƻ½ÌÀ½Å½¹ËÍʽŽÆÌƖ
Pressure
Bypass tubes