Reference Manual
00809-0100-4148, Rev BA
July 2010
Rosemount 148
A-2
Temperature Limits
Operating Limit
• –40 to 185 °F (–40 to 85 °C)
Storage Limit
• –58 to 248 °F (–50 to 120 °C)
Turn-on Time
Performance within specifications in less than 5.0 seconds after power is
applied to transmitter, when damping value is set to zero seconds.
Update Rate
Less than 0.5 seconds
Custom Alarm and Saturation Levels
Custom configuration of alarm and saturation levels is available by using the
148 PC Programmer.
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. The values
for standard and NAMUR-compliant operation are as follows:
Table A-1. Operation
Parameters
Certain hardware failures, such as microprocessor failures, will always drive
the output to greater than 23 mA.
Physical Specifications
Communication Connections
Communication Terminal: Clips permanently fixed to the terminals.
Materials of Construction
Electronics Housing
• Noryl
®
glass reinforced
Universal (option codes U and H) Heads
• Housing:
Low-copper aluminum (option code U)
Stainless Steel (option code H)
• Paint: Polyurethane
• Cover O-Ring: Buna-N
Mounting
The Rosemount 148 installs in a connection head or universal head mounted
directly on a sensor assembly or apart from a sensor assembly using a
universal head. The Rosemount 148 can also mount to a DIN rail using an
optional mounting clip.
Standard
(1)
(1) Measured in milliamperes
NAMUR NE43- Compliant
(1)
Linear Output:
3.9
I
20.5
3.8
I
20.5
Fail High:
21
I
23 (default)
21
I
23
Fail Low:
I
3.75
I
3.6