Emerson Rosemount 3144P Reference Manual page 12

Installation
December 2019
Example
The maximum permissible housing temperature rise (T) can be calculated by subtracting
the maximum ambient temperature (A) from the transmitter's ambient temperature
specification limit (S). For instance, if A = 40 °C.
T = S – A
T = 85 °C – 40 °C
T = 45 °C
For a process temperature of 540 °C (1004 °F), an extension length of 3.6-in (91.4 mm)
yields a housing temperature rise (R) of 22 °C (72 °F), providing a safety margin of 23 °C
(73 °F). A 6.0-in.(152.4 mm) extension length (R = 10 °C [50 °F]) offers a higher safety
margin (35 °C [95 °F]) and reduces temperature-effect errors but would probably require
extra transmitter support. Gauge the requirements for individual applications along this
scale. If a thermowell with lagging is used, the extension length may be reduced by the
length of the lagging.
2.1.4 Moist or corrosive environments
The Rosemount 3144P Transmitter has a highly reliable dual compartment housing
designed to resist moisture and corrosion. The sealed electronics module is mounted in a
compartment that is isolated from the terminal side with conduit entries. O-ring seals
protect the interior when the covers are properly installed. In humid environments,
however, it is possible for moisture to accumulate in conduit lines and drain into the
housing.
Note
Each transmitter is marked with a tag indicating the approvals. Install the transmitter
according to all applicable installation codes, and approval and installation drawings (see
Rosemount 3144P
transmitter is consistent with the hazardous locations certifications. Once a device labeled
with multiple approval types is installed, it should not be reinstalled using any of the other
labeled approval types. To ensure this, the approval label should be permanently marked
to distinguish the approval type(s) used.
2.1.5 Location and position
When choosing an installation location and position, take access to the transmitter into
account.
Terminal side of electronics housing
Mount the transmitter so the terminal side is accessible, allowing adequate clearance for
cover removal. Best practice is to mount the transmitter with the conduit entries in a
vertical position to allow for moisture drainage.
Circuit side of electronics housing
Mount the transmitter so the circuit side is accessible, providing adequate clearance for
cover removal. Additional room is required for LCD display installation. The transmitter
may be mounted directly to or remotely from the sensor. Using optional mounting
12
Product Data Sheet). Verify that the operating atmosphere of the
Reference Manual
00809-0100-4021
Rosemount 3144P