Emerson Rosemount 248 Reference Manual page 60

Appendix A: Specifications and reference data
March 2014
Transient protection
The Rosemount 470 prevents damage from transients induced by lightning, welding, heavy
electrical equipment, or switch gears. Refer to the Rosemount 470 Product Data Sheet
(Document No. 00813-0100-4191) for more information.
Temperature limits
Operating limit

Storage limit

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 factory configuration of alarm and saturation levels is available with option code C1 for
valid values. These values can also be configured in the field using a Field Communicator.
Software detected failure mode
The values at which the transmitter drives its output in failure mode depends on whether it is
configured to standard, custom, or NAMUR-compliant (NAMUR recommendation NE 43)
operation. The values for standard and NAMUR-compliant operation are as follows:
Table A-1. Operation Parameters
Linear Output:
Fail High:
Fail Low:
(1) Measured in milliamperes.
Certain hardware failures, such as microprocessor failures, will always drive the output to
greater than 23 mA.
52
–40 to 185 °F (–40 to 85 °C)
–58 to 248 °F (–50 to 120 °C)
Standard
3.9  I  20.5
21  I  23 (default)
I  3.75
(1)
NAMUR NE43- Compliant
3.8  I  20.5
21  I  23 (default)
I  3.6
Reference Manual
00809-0100-4825, Rev CB
(1)
Specifications and Reference Data