Installation
7
2.2 Mounting the Electronic Unit (Continued)
The mounting location for the sensing element (probe) is
often determined by whether there is a suitable location
inside a vessel. An external side arm or stilling well can be
considered.
The following sensing element mounting and installation
instructions should be followed so that the equipment will
operate properly and accurately:
A. In applications requiring an insulated sensing element,
use particular care during installation. There is always
the danger of puncturing the insulation, especially with
the thin-walled probes.
B. Sensing elements should be mounted in such a manner
that they are not in the direct stream of a lling nozzle
or chute. If this is not possible, a deecting bafe should
be installed between the probe and the ll.
C. Do not take the sensing element apart or loosen the
packing glands. Follow instructions in Figure 2-3.
D. Avoid installing the sensing element with any of the
common mistakes shown in Figure 2-4.
E. If a stilling well is used, ensure that "vent" holes are
large enough to allow free passage of both air and process
material. Holes should be 5/8" or larger, 120° apart,
every 2-3 feet along the length of the stilling well.
F. Sensing elements that are mounted in agitated vessels
usually require brackets and supports to control the
position of the sensor during agitation. See Figure 2-5.
G. For non-metallic vessels without Drexelbrook self-
grounding sensing elements, choose one of the grounding
recommendations shown in Figure 2-6.
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