Endress+Hauser FTM50-AGG2A4A32AA | Liquiphant M Level Switch, 4-20mA HART, 316L, G1½"
Endress+Hauser FTM50-AGG2A4A32AA Liquiphant M vibrating fork level switch. 4-20mA HART, G1½" PN40, 316L wetted parts, -40 to 150°C, SIL 2/3, for liquid point level.
Product Overview
The Endress+Hauser FTM50-AGG2A4A32AA is a vibrating fork (tuning fork) level switch from the Liquiphant M FTM50 series, designed for point level detection of liquids (presence/absence) in tanks, pipes, and sumps. It features a G1½" PN40 process connection, 316L stainless steel wetted parts, and a 4-20mA HART output with integrated diagnostics. The fork frequency shifts when covered by liquid, triggering a solid-state relay and analog signal — unaffected by turbulence, foam, bubbles, or dielectric changes down to εᵣ > 1.5. This variant is SIL 2/3 certified and suitable for safety-relevant alarm/shutdown loops.
Technical Specifications (Electrical & Functional)
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Parameter
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Specification
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Model / Order Code
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FTM50-AGG2A4A32AA
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Product Family
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Liquiphant M FTM50 (Vibrating Fork for Liquids)
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Function
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Point Level Switch (High / Low Alarm)
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Measured Variable
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Liquid Coverage of Fork (Covered / Uncovered)
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Switching Output
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1 x SPDT Relay (Dry Contact — typically 8A @ 250V AC) + 4-20mA HART (Status/Diagnostics)
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Supply Voltage
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18.5 … 53 V DC or 20 … 253 V AC (50/60 Hz) — depends on electronics version; HART version typically 24V DC loop
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Switch Delay
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< 1 s (Cover / Uncover)
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SIL Rating
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SIL 2 (SIL 3 by Architectural Constraint) per IEC 61508
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Self-Monitoring
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Continuous — detects fork damage, electronics fault, coating buildup
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Technical Specifications (Mechanical & Process)
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Parameter
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Specification
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Process Connection
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G 1½" (BSP Parallel) Female Thread, PN 40 (ISO 228-1)
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Fork Length (Immersion)
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~67 mm (standard FTM50 short fork — verify from full code)
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Wetted Parts Material
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316L (1.4404) Stainless Steel
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Housing Material
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Aluminum (Painted) or Stainless Steel (optional)
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Process Temperature Range
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-40 … +150 °C
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Process Pressure Range
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-1 … +64 bar (PN 40 @ 20°C, derated with T)
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Medium Density (Min.)
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≥ 0.5 g/cm³ (typical for fork — consult datasheet for viscous media)
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Protection Rating
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IP66 / IP67, NEMA 4X (with proper cable gland)
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Approvals / Area
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ATEX, IECEx (Ex d / Ex e versions available), FM, CSA, WHG (overfill prevention)
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Key Features
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Fork Physics — Immune to Process Noise: Vibration damping only occurs when both tines are covered by liquid — ignores foam, bubbles, turbulence, and dielectric changes (εᵣ > 1.5).
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No Calibration Required: Factory-tuned — install and wire; no sensitivity adjustment or teach-in needed.
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SIL 2/3 Capable: Suitable for Safety Instrumented Functions (SIF) in overfill or dry-run protection loops.
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HART Diagnostic Feedback: 4-20mA HART signal reports switch state, fork frequency, and device health to DCS/AMS for predictive maintenance.
Applications
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Overfill / Low-Level Alarms: High-level alarm in storage tanks, day tanks, and IBCs.
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Pump Protection: Dry-run detection in suction lines and pump sumps (low-level cut-out).
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Interface / Emulsion Detection: Where media density difference is sufficient (liquid vs. gas or light/heavy liquid interface — limited application).
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Hazardous Area Service: With appropriate Ex certification — suitable for chemical, petrochemical, and pharmaceutical tank farms.
Note: For smaller process connections (G¾", G1", flange) or high-temperature/high-pressure versions, see other FTM50 variants. For bulk solid (powder/granule) vibrating forks, use the Soliphant FTM20/21 series. The exact fork length, housing type (Al vs. SS), and Ex approval are defined by the full 10-character suffix — the model shown represents a typical G1½" PN40, 316L, HART-output Liquiphant M.
