Emerson Rosemount 848T, Reference Manual, Page: 66 / 136

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Reference Manual
00809-0100-4697, Rev GA
Appendix A: Reference Data
November 2014
Reference Data
A.1.8 Update time
Approximately 1.5 seconds to read all 8 inputs.
A.1.9 Humidity limits
0–99% non-condensing relative humidity
A.1.10 Turn-on time
Performance within specifications is achieved in less than 30 seconds after power is applied to
the transmitter.
A.1.11 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.
A.1.12 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.
F
OUNDATION
fieldbus parameters
A.2 Physical specifications
A.2.1 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 a 2-in. pipe stand (with option code B6).
A.2.2 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.
Schedule Entries 20
Links 30
Virtual Communications Relationships (VCR) 20