Probe type in chamber considerations
When installing a Rosemount 5300 in a chamber, the single lead probe is recommended.
Other probe types are more susceptible to build-up and are not recommended.
An
exception is applications with liquefied gas > 40 bar, where a coaxial probe should be used.
The probe must not touch the chamber wall, should extend the full height of the chamber,
but not touch the bottom of the chamber.
The probe length determines if a single rigid or single flexible probe should be used:
•
Less than 19.7 ft. (6.0 m): Rigid single probe is recommended. Use a centering disc for
probe > 3.3 ft. (1 m). When mounting space is limited, use a flexible single probe with a
weight and centering disc.
•
More than 19.7 ft. (6.0 m): Use flexible single probe with a weight and centering disc.
A short weight is available for the single flexible probe. It is used for measuring close to the
probe end and shall be used where the measuring range must be maximized. The height is
2 in. (50 mm) and the diameter is 1.5 in. (37.5 mm). The option code is W2.
PTFE covered probes are not recommended for chamber/pipe installations.
Existing chamber
A Rosemount 5300 Level Transmitter is the perfect replacement in an existing displacer
chamber. Proprietary flanges are offered, enabling use of existing chambers to make
installation easy.
Figure 3-8: Existing Displacer Chamber
$
&
%
A. Replace chamber flange
B. Probe length
C. Displacer Length
Considerations when changing to Rosemount 5300:
•
The Rosemount 5300 Level Transmitter flange choice and probe length must be
correctly matched to the chamber. Both standard ASME and EN (DIN), as well as
(2)
The single probe creates a virtual coaxial probe with the chamber as the outer tube. The extra gain provided by the twin
and coaxial probes is not necessary; the electronics in the Rosemount 5300 Level Transmitter is very sensitive and is not a
limiting factor.
(3)
The Blind Zones and the height of the weight limit the use of single flexible probes shorter than 3 ft. (1 m). If using the
flexible probe, the short weight is recommended.
Mechanical installation
Reference Manual
April 2019
00809-0100-4530
38
Rosemount 5300 Level Transmitter