8
Rosemount 848T Family
November 2014
www.rosemount.com
Specifications
Functional specifications
Inputs
Eight independently configurable channels including
combinations of 2- and 3-wire RTDs, thermocouples, mV, and 2-
and 3-wire ohm inputs. 4–20 mA inputs using optional
connector(s).
Outputs
Manchester-encoded digital signal that conforms to IEC 61158
and ISA 50.02.
Status
If self-diagnostics detect a sensor burnout or a transmitter
failure, the status of the measurement will be updated
accordingly.
Ambient temperature limits
–40 to 185 °F (–40 to 85 °C)
Accuracy
(Pt 100 @ reference condition: 20 °C) ±0.30 °C (±0.54 °F); for the
complete list, see “Accuracy” on page 10.
Isolation
600 Vdc channel to channel isolation
(1)
.
10 Vdc channel to channel isolation for all operating
conditions with maximum 150 meters (500 feet) of sensor
lead length 18 AWG.
Power supply
Powered over FOUNDATION fieldbus with standard fieldbus power
supplies. The transmitter operates between 9.0 and 32.0 Vdc,
22 mA maximum. (Transmitter power terminals are rated
to 42.4 Vdc.)
Transient protection
The transient protector (option code T1) helps to prevent
damage to the transmitter from transients induced on the loop
wiring by lightning, welding, heavy electrical equipment, or
switch gears. This option is installed at the factory for the
Rosemount 848T and is not intended for field installation.
Update time
Approximately 1.5 seconds to read all 8 inputs.
Humidity limits
0–99% non-condensing relative humidity.
Turn-on time
Performance within specifications is achieved in less than 30
seconds after power is applied to the transmitter.
Alarms
The AI and ISEL function blocks allow the user to configure the
alarms to HI-HI, HI, LO, or LO-LO with a variety of priority levels
and hysteresis settings.
Electromagnetic compatibility compliance
testing
Meets the criteria under European Union Directive
2004/108/EC
Meets the criteria under IEC 61326: 2006
Stability
±0.1% of reading or 0.1 °C (0.18 °F), whichever is greater, for 2
years for RTDs.
±0.1% of reading or 0.1 °C (0.18 °F), whichever is greater, for 1
year for thermocouples.
Self calibration
The transmitter’s analog-to-digital circuitry automatically
self-calibrates for each temperature update by comparing the
dynamic measurement to extremely stable and accurate
internal reference elements.
Vibration effect
Tested to the following with no effect on performance per IEC
60770-1, 1999.
(1) Reference conditions are -40 to 60 °C (-40 to 140 °F) with 30 meters (100
feet) of sensor lead length 18 AWG wire.
Frequency acceleration
10-60 Hz 0.21 mm peak displacement
60-2000 Hz 3 g
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