Rosemount 2130 - Measurement Principle; Short Fork Technology; Special Features

Reference Manual
00809-0100-4130, Rev AA
May 2009
1-3
Rosemount 2130
Figure 1-1.
Features of the 2130
Measurement Principle The Rosemount 2130 is a liquid point level switch, designed using the
principle of a tuning fork. A piezo-electric crystal oscillates the forks at their
natural frequency. Changes to this frequency are continuously monitored.
When used as a low alarm, the liquid in the vessel drains down past the fork,
causing a change of natural frequency that is detected by the electronics and
switches the output state.
When the 2130 is used as a high alarm, the liquid rises in the vessel making
contact with the fork causing the output state to switch.
Short Fork Technology The natural frequency (~1300Hz) of the fork avoids interference from plant
vibration that may cause false switching. This allows for minimum intrusion
into the vessel or pipe through the use of a short fork.
Using Short Fork Technology, the Rosemount 2130 can be used in almost all
liquid applications. Extensive research has maximized the operational
effectiveness of the fork design, making it suitable for most liquids including
coating liquids (avoid bridging of forks), aerated liquids, and slurries.
Special Features Mode Switch and Adjustable Time Delay
A mode switch allows the 2130 to be set to switch from wet-to-dry (typically
for low level alarm) or from dry-to-wet (typically for high level alarm).
There is also a user-selectable time delay of 0.3, 1, 3, 10, or 30 seconds.
Increasing the time delay in turbulent or splashing applications virtually
eliminates the risk of false switching.
Wetted material in 316 SST, or
Alloy C and Alloy C-276
NEMA Type 4X (IP66/67)
Housings in Aluminum,
or 316 SST
Two
cable/Conduit
Entries
Short Fork Length
with Extensions
up to 118 in. (3 m)
Threaded,
Flanged, or
Hygienic
Connections
Magnetic
Test Point
Thermal Tube
Fast Drip Design
ATEX, FM, CSA, IECEx
Flameproof /
Explosion-proof, and
Intrinsically Safe
2130_02AA.JPG
Direct Load,
Relay (DPCO),
PLC/PNP, or NAMUR
Electronics Cassette