Product Data Sheet
00813-0100-4697, Rev GA
Catalog 2008 - 2009
Rosemount 848T Family
Temperature-4
Specifications
FUNCTIONAL
Inputs
Eight independently configurable channels including combinations
of 2- and 3-wire RTDs, thermocouples, mV, and Ω inputs.
4-20 mA inputs using optional connector(s).
All sensor terminals are rated to 42.4 VDC.
Outputs
Manchester-encoded digital signal that conforms to IEC 1158-2
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)
Isolation
Input/output isolation is tested to 500 VAC rms (707 VDC).
Input/input isolation between each sensor input connector is
tested to 500 VAC rms (707 VDC). Input/input isolation between
sensors on the same input connector is 3 VAC at 50 – 60 Hz, 1.5
VDC.
Power Supply
Powered over FOUNDATION fieldbus with standard fieldbus power
supplies. The transmitter operates between 9.0 and 32.0 V dc,
22 mA maximum. (Transmitter power terminals are rated
to 42.4 V dc.)
Transient Protection
The transient protector (option code T1) helps to prevent damage
to the transmitter from transients induced on the loop wiring by
lightening, 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.
ASME B 16.5 (ANSI)/IEEE C62.41-1991
(IEEE 587), Location Categories A2, B3.
6 kV / 3 kA peak (1.2 x 50 μS Wave 8 x 20 μS Combination Wave)
6 kV / 0.5 kA peak (100 kHz Ring Wave)
4 kV peak EFT (5 x 50 nS Electrical Fast Transient)
Update Time
Approximately 1.5 seconds to read all eight inputs.
Humidity Limits
0–100% non-condensing relative humidity
Turn-on Time
Performance within specifications is achieved in less than 50
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.
Backup Link Active Scheduler (LAS)
The transmitter is classified as a device link master, which means
it can function as a Link Active Scheduler (LAS) if the current link
master device fails or is removed from the segment.
The host or other configuration tool is used to download the
schedule for the application to the link master device. In the
absence of a primary link master, the transmitter will claim the LAS
and provide permanent control for the H1 segment.
FOUNDATION Fieldbus Parameters
PHYSICAL
Mounting
The Rosemount 848T can be mounted directly onto a DIN rail or it
can be ordered with an optional junction box. When using the
optional junction box, the transmitter can be mounted onto a panel
or to a 2-in. pipe stand (with option code B6).
Entries for Optional Junction Box
No entry
• Used for custom fittings
Cable Gland
• 9 x M20 nickel-plated brass glands for 7.5–11.9 mm
unarmored cable
Conduit
• 5 plugged 0.86-in. diameter holes suitable for installing
1
/2-in.
NPT fittings.
Materials of Construction for Optional Junction Box
Weight
Environmental Ratings
Type 4X, and CSA Enclosure Type 4X, and IP66 with optional
junction box.
Schedule Entries 25
Links 30
Virtual Communications Relationships (VCR) 20
Junction Box Type Paint
Aluminum Epoxy Resin
Plastic NA
Stainless Steel NA
Assembly Weight
oz lb kg
Rosemount 848T only 9.60 0.60 0.27
Aluminum
(1)
(1) Add 35.2 oz (2.2 lb, 0.998 kg) for nickel-plated brass glands
78.2 4.89 2.22
Plastic
(1)
58.1 3.68 1.65
Stainless Steel
(1)
77.0 4.81 2.18
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