Emerson Rosemount 928 Reference Manual page 103

Reference Manual
00809-0100-4928
3.3.3 Conduit entries
Upon installation, ensure that each conduit entry is either sealed with a conduit plug using
appropriate thread sealant or has a conduit fitting or cable gland installed with appropriate
thread sealant.
Figure 3-2: Conduit Entries
A. Conduit entries
3.3.4 Choosing an installation location and position
When choosing an installation location and position, take into account access to the
transmitter for ease of power module and sensor replacement. For best performance,
install the antenna vertically with space between objects in a parallel metal plane, such as
a pipe or metal framework, as the pipes or framework may adversely affect the antenna's
performance.
The Rosemount 928 is a diffusion-based gas monitor. This means that the target gas must
actually come into contact with the electrochemical sensor for the device to register a
signal. Each target gas has a unique density and behaves differently depending on the
density of the surrounding atmosphere. For example, hydrogen sulfide is considered a
heavier-than-air gas and tends to settle in low-lying areas when released into the air.
Install all transmitters with the sensor module facing downwards. Install devices with
sensors for heavier-than-air gases close to ground level, ideally between 12 in. (30.5 cm)
above the ground and a breathing zone of a worker (3- 6 ft. [0.9 - 1.8 m] above grade level).
Rosemount 928
Installation
February 2023
103