Quick Start Guide
3
July 2017
1.0 Introduction
1.1 Overview of the Rosemount 2130
The Rosemount 2130 Level Switch (“level switch”) uses vibrating short fork
technology, and is suitable for virtually all liquid applications.
The level switch is designed using the principle of a tuning fork. A piezo-electric
crystal oscillates the forks at their natural frequency (~1400 Hz). Changes to this
frequency are continuously monitored. The frequency of the vibrating fork sensor
changes depending on the medium in which it is immersed. The denser the
liquid, the lower the frequency.
When used as a low level alarm, the liquid in the tank or pipe drains down past the
fork, causing a change of natural frequency that is detected by the electronics
and switches the output state to a dry condition. When the level switch is used as
a high level alarm, the liquid rises in the tank or pipe, making contact with the fork
which then causes the output state to switch to a wet condition.
The level switch continuously performs instrument health diagnostics to
self-check the condition of the fork and sensor. These diagnostics can detect
damage to the forks including corrosion, internal or external damage to the forks,
and breakages to the internal wiring. Any of these conditions will trigger the
'heartbeat' LED to pulse intermittently, followed by safe handling of the electrical
load. The level switch has a ‘heartbeat’ LED that indicates its operating state. The
LED flashes when the switch output is ‘off’ and is constantly lit when 'on'.
Figure 1. Rosemount 2130 Features
A. Direct Load, PLC/PNP, DPCO Relay, E. Threaded, flanged, or hygienic
Fault + Alarm Relays (2 x SPCO), process connections
NAMUR, or 8/16 mA electronics F. Thermal Tube in 316/316L SST
B. NEMA®Type 4X (IP66/67) housings in (2130***E only)
aluminum or 316 SST G. Magnetic test point
C. Short fork length with extensions H. Two cable/conduit entries
up to 118 in. (3 m). Fast drip design
D. Wetted material in 316/316L SST,
solid Alloy C and Alloy C-276, or
ECTFE/PFA coated 316/316L SST