Emerson Rosemount 148, Reference Manual, Page: 7 / 36

Table 1-1: Headmount Revisions
Software release date Identify device Review instructions
NAMUR software
revision
NAMUR hardware
revision
(1)
Reference Manual
June 2019 1.0.1 1.0.2 00809-0100-4148
(1) NAMUR Software Revision is located in the hardware tag of the device.
1.3 Considerations
1.3.1 General
Electrical temperature sensors such as RTDs and thermocouples produce low-level signals
proportional to the sensed temperature. The Rosemount
™
148 Temperature Transmitter
converts the low-level sensor signal to a standard 4–20 mA DC signal that is relatively
insensitive to lead length and electrical noise. This current signal is transmitted to the
control room via two wires.
1.3.2 Mechanical
Location
Take into account the need for access to the transmitter when choosing an installation
location.
Special mounting
Special hardware is available for mounting a Rosemount 148 head mount transmitter to a
DIN rail.
1.3.3 Electrical
Proper electrical installation is necessary to prevent errors due to sensor lead resistance
and electrical noise. For best results, shielded cable should be used in electrically noisy
environments.
Make wiring connections through the cable entry in the side of the connection head. Be
sure to provide adequate clearance for cover removal.
1.3.4 Environmental
The transmitter electronics module is permanently sealed within the housing, resisting
moisture and corrosive damage. Verify that the operating atmosphere of the transmitter
is consistent with the appropriate hazardous locations certifications.
Reference Manual Introduction
00809-0100-4148 June 2019
7