Detailed Product Description

INSTALLATION READY SOLUTIONS
The Rosemount 148 is part of the Complete Point
Solutions (CPS) program. CPS guarantees that the
transmitter, housing, sensor, extension, and
thermowell can be shipped from the factory as an
installation-ready assembly.
INCREASED PERFORMANCE
The Rosemount 148 offers better measurement
accuracy and improved reliability over wiring a
temperature sensor directly back to the DCS.
FLEXIBILITY
The Rosemount 148 is compatible with 2-, 3-, and
4-wire nickel and platinum RTDs, a variety of
thermocouple sensors, and ohm inputs.
LOW INSTALLED COST
The Rosemount 148 reduces overall installation
costs when compared to wiring sensors direct. In
addition, the 148 can eliminate the use of expensive
extension wires and multiplexers.
PROGRAMMABLE
The Rosemount 148 PC Programmer interface
consists of a programmer, cables, and configuration
software. The configuration software, when used in
conjunction with the interface, provides the tools
necessary to select the sensor type, sensor range,
and sensor error action in addition to many other
options.
ROSEMOUNT TEMPERATURE SOLUTIONS
Rosemount 3144P
Field mount style HART® or FOUNDATION
fieldbus
protocol. Dual sensor input with advanced
diagnostics.
Rosemount 644 Smart Temperature Transmitter
Head mount styles available with HART® or
FOUNDATION
fieldbus protocol. Rail mount style
available for HART protocol.
Rosemount 848T Eight Input Temperature
Transmitter
Eight input transmitter available with FOUNDATION

fieldbus protocol.
Rosemount 3420 Fieldbus Interface Module
Provides an interface between FOUNDATION

fieldbus instruments and systems without fieldbus
capability using standard interface protocols.
Rosemount 248 Temperature Transmitter
Head mount (DIN B) and Rail mount style with
HART® protocol and complete temperature
assembly.
Rosemount sensors, thermowells, and
extensions
Rosemount has a broad offering of RTD and
thermocouples that are designed to meet plant
requirements.
FUNCTIONAL SPECIFICATIONS
Inputs
User-selectable; sensor terminals rates to 42.4 V dc. See
Transmitter Accuracy and Ambient Temperature Effects on
page 4 for sensor options.
Output
2-wire 420 mA, linear with temperature or input.
Isolation
Input/Output isolation tested to 500V ac rms (707 V dc) at 50/60
Hz.
Supply Voltage DC
Standard: 12 to 35 V
Intrinsic Safety: 12 to 28 V
Minimum Voltage Across Terminals
12 V dc
Humidity Limits
0 - 95% relative humidity, non-condensing
NAMUR Recommendations
The 148 meets the following NAMUR recommendations:
NE 21 - Electromagnetic compatibility (EMC) for Process and
Laboratory Apparatus
NE 43 - Standard of the signal level breakdown information of
digital transmitters
Transient Protection
The optional rosemount 470 Transient Protector prevents damage
from transients induced by lightning, welding, heavy electrical
equipment, or switch gears. Refer to the 470 Product Data Sheet
(document number 00813-0100-4191) for more information.
Temperature Limits
Operating Limit
-40 to 185 °F (-40 to 85 °C)
Storage Limit
-58 to 248 °F (-50 - 120 °C)
Turn-on Time
Performance within specifications is less than 5.0 seconds after
power is applied to the transmitter, when damping value is set to
zero seconds.
Update Rate
Less than 0.5 seconds
Damping
32 seconds maximum, 5 seconds default.
Recommended Minimum Measuring Span
18 °F (10 °C)
Software Detected Failure Mode
The values at which the transmitter drives its output in failure
mode depends on device configuration. The device can be
configured to meet NAMUR-compliant (NAMUR recommendation
NE 43) operation.
APPROVED MANUFACTURING
LOCATIONS
Rosemount Inc. Chanhassen, Minnesota, USA
Emerson Process Management Temperature GmbH Germany
Emerson Process Management Asia Pacific Singapore
EUROPEAN UNION DIRECTIVE
INFORMATION
The EC declaration of conformity for all applicable European
directives for this product can be found on the Rosemount website.
ATEX Directive (94/9/EC)
Rosemount Inc. complies with the ATEX Directive.
Electro Magnetic Compatibility (EMC)
(89/336/EEC)
All Models: EN 50081-1: 1992; EN 50082-2:1995;
EN 61326-1. 2006
CE Mark
The 148 meets all requirements listed under
IEC 61326:Amendment 1,2006
HAZARDOUS LOCATIONS
CERTIFICATIONS(1)
North American Certifications
Factory Mutual (FM)
I5 FM Intrinsic Safety and Non-incendive
Intrinsically Safe for Class I/II/III, Division 1, Groups A, B, C,
D, E, F, and G. Non-incendive Field Circuit for Class I,
Division 2, Groups A, B, C, and D. Intrinsically Safe and
non-incendive when installed in accordance with
Rosemount drawing 00148-1055.
Temperature Codes:
T5 (Tamb = 50 to 75 °C)
T6 (Tamb = 50 to 40 °C)
FM Explosion-Proof
Explosion-Proof for Class I, Division 1, Groups B, C, and D.
Dust Ignition Proof for Class II/III, Division 1, Groups E, F, G
when installed in accordance with Rosemount drawing
00148-1065.
Temperature Code:
T5 (Tamb = 40 to 85 °C)
Combination Certifications
K5 Combination of I5 and E5.
Canadian Standards Association (CSA) Approvals
I6 CSA Intrinsically Safe and Class I, Division 2
Intrinsically Safe for Class I, Division 1, Groups A, B, C, and
D when installed in accordance with Rosemount drawing
00148-1056.
Temperature Codes:
T5 (Tamb = 50 to 60 °C)
T6 (Tamb = 50 to 40 °C)
Suitable for use in Class I, Division 2, Groups A, B, C, and D.
K6 CSA Intrinsically Safe, Explosion-Proof, and Class I,
Division 2.
Combination of I6 and Explosion-Proof for Class I, Division
1, Groups B, C, and D; Class II, Division 1, Groups E, F, and
G; Class III, Division 1 hazardous locations, when installed
in accordance with Rosemount drawing 00644-1059.
Suitable for Class I, Division 2, Groups A,B, C, and D.
Ambient Temperature Limit: 50 to 85°C