Emerson Rosemount 2110 Level Switch

Emerson Rosemount 2110 Level Switch

The Rosemount 2110 is a liquid point level switch based on vibrating short fork technology — a compact, rugged device with no moving parts, requiring no calibration, and virtually unaffected by flow, turbulence, bubbles, foam, vibration, or solids content-53. When installed alongside an Annubar flow meter system — particularly on pump suction lines, storage vessels, or process skids — the 2110 provides essential level detection for pump protection, overfill prevention, high level alarm, leak detection, and pump control.

A piezo-electric crystal oscillates the forks at their natural frequency (~1300 Hz). The frequency of the vibrating fork changes depending on the medium in which it is immersed — the denser the liquid, the greater the frequency shift. The electronics detect this shift and switch the output state accordingly-.

Complete Rosemount 2110 Model Numbers

The Rosemount 2110 series follows an ordering code structure where each complete model number encodes specific configuration options:

Additional Rosemount 2110 variations include hygienic connections for food industry use (3-A and EHEDG certificates, complying with FDA and ASME-BPE standards), extended fork lengths for deeper vessel insertion, and versions with built-in diagnostics that continuously monitor instrument health-1.

Full Technical Specifications

Key Features

No calibration required — install and operate immediately-53

Polarity insensitive and short circuit protection — simplifies wiring

Status LED — provides clear visual indication of switch state

Local Magnetic Test Point — makes proof testing easy without removing the device-53

Fast Drip fork design — remaining liquid is drawn away from fork tips, giving quicker response time, especially with viscous liquids-47

Rapid wet-to-dry time — highly responsive switching for fast process changes

Compact stainless steel housing and fast-fit plug-socket connection — ideal for high-volume OEM users-1

No moving parts — virtually no maintenance throughout service life

Integrated Annubar + 2110 System Applications

Combining Annubar flow measurement with Rosemount 2110 level detection creates comprehensive monitoring and protection systems across numerous industries:

Pump Protection Systems

In pump suction lines, the Rosemount 2110 — for example, 211000A1NA with 3/4″ BSPT thread — provides low level detection to prevent pump run-dry conditions, while the Annubar flow meter monitors flow rate. When the 2110 detects a low level condition, it triggers an alarm or pump shutdown before cavitation or mechanical damage occurs.

Overfill Prevention in Storage Vessels

For storage tanks receiving flow measured by an Annubar system, the Rosemount 2110 (TÜV tested and WHG approved for overfill prevention) provides regulatory-compliant high level switching independent of the primary flow measurement — a critical safety layer in liquid storage applications-1.

OEM Skid Fabrication

OEM skid builders benefit from the compact size of both devices. The 211001A1NA model with direct load switching and the Rosemount 2051CFA Annubar flow meter (for line sizes 2 to 12 inches) together form a compact, factory-calibrated measurement and protection skid requiring minimal panel space-9.

Hygienic and Sanitary Processes

For food, beverage, and pharmaceutical applications, the 2110 with hygienic connections (3-A and EHEDG certified) provides level detection in sanitary piping systems while the Annubar (316L SST wetted materials) measures flow — both devices meeting FDA and ASME-BPE standards for cleanability-1.

Installation Considerations

Annubar Installation

Orientation: Liquid applications require sensor positioned between 15° to 45° from vertical down; gas applications require sensor on upper half of pipe, at least 45° above horizontal line; steam applications follow specific guidelines.

Straight Run Requirements: Minimum 8–30 upstream pipe diameters and 4 downstream pipe diameters depending on upstream disturbance type (pipe bends, elbows, reducers, expanders, or valves).

Alignment Tolerance: Maximum misalignment ±3° from specified orientation; flow direction arrow on sensor tag must point in flow direction.

Rosemount 2110 Installation

Mounting Orientation: Install in any orientation in tank containing liquid-.

Fork Clearance: Ensure forks do not come into contact with tank wall or any internal fitting.

Pipeline Mounting: EHEDC recommends horizontal stub mounting in pipelines for optimal performance and cleanability.

Power and Output: Direct load switching (2-wire) suits all AC/DC supplies from 21–264 V; PNP output (3-wire) for direct interface to PLCs.

Wiring: Polarity insensitive and short circuit protection simplify installation.

No Calibration Required: Unlike float switches, conductive, capacitive, or optical sensors, the Rosemount 2110 requires zero calibration upon installation

Comparison: Annubar Flow Meter vs. Magnetic Flow Meter

For users evaluating flow measurement technologies, magnetic flow meters like the Rosemount 8705 flanged sensor series offer 0.25% standard accuracy with 0.15% high accuracy option, and the Rosemount 8750W series provides line sizes from 0.5 to 48 inches with PTFE or Neoprene liners.

Advantages of Annubar Technology

Low Permanent Pressure Loss: Minimal obstruction design reduces pumping energy requirements, delivering significant operational cost savings over the instrument‘s lifecycle.

Suitable for Large Diameter Lines: Models available with full-diameter support at both ends, providing robust performance while remaining economical for large line sizes.

Multi-Variable Capability: T-shaped sensor design enables temperature, pressure, and flow measurements through a single pipe penetration, reducing potential leak points and installation costs.

Minimal Maintenance: With no moving parts, the Annubar requires minimal maintenance; stagnation zone design captures particulate matter before it reaches measurement ports.

Cost-Effective Installation: No special flanges, spool sections, or extensive piping modifications — standard ANSI/ASME flanges or Pak-Lok assemblies can be used.

Warranty and Support

Annubar Flow Meters: Up to 15-year limited warranty on select models (3051SFA)

Rosemount 2110 Level Switch: Standard 12–18 month warranty