Emerson Rosemount 848T, Reference Manual, Page: 67 / 136

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Reference Manual
00809-0100-4697, Rev GA
Appendix A: Reference Data
November 2014
Reference Data
Materials of construction for optional junction box
Weight
A.2.3 Environmental ratings
NEMA Type 4X and IP66 with optional junction box. JX3 Explosion-proof enclosure rated to -4 °F
(-20 °C).
A.3 Function blocks
A.3.1 Analog input (AI)

Processes the measurement and makes it available on the fieldbus segment.

Allows filtering, alarming, and engineering unit changes.
A.3.2 Input selector (ISEL)

Used to select between inputs and generate an output using specific selection
strategies such as minimum, maximum, midpoint, or average temperature.

Since the temperature value always contains the measurement status, this block allows
the selection to be restricted to the first “good” measurement.
A.3.3 Multiple analog input block (MAI)

The MAI block allows the eight AI blocks to be multiplexed together so they serve as
one function block on the H1 segment, resulting in greater network efficiency.
Junction box type Paint
Aluminum Epoxy Resin
Plastic NA
Stainless Steel NA
Aluminum Explosion-proof NA
Assembly
Weight
oz lb kg
Rosemount 848T only 7.5 .47 .208
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)
78.2 4.89 2.22
Stainless Steel
(1)
77.0 4.81 2.18
Aluminum Explosion-proof 557 34.8 15.5