Technical Datasheet: Endress+Hauser Liquiphant M (FTL51)

Order Code: FTL51-1H9D7/0

Extended Order Code: FTL51-GGR2BB7G5A

Serial Number: HB060E01027

Electronic Insert: FEL57 (2-Wire PFM Signal Output)

Manufacturer Location: D-79689 Maulburg, Germany

1. Product Characteristics & Application

• Measurement Principle: Vibronic Point Level Switch (Tuning Fork).

• Mechanical Structure: Extension tube design (FTL51 model) with an insertion length ($L$) of 500 mm and a defined switchpoint at 487 mm.

• Application: Precise level detection in liquid storage tanks, process vessels, and piping networks. Completely immune to changing liquid densities, flow turbulence, air bubbles, foam, and severe process vibrations.

• Safety Integration: Engineered and certified for functional safety loops up to SIL2 / SIL3 (IEC 61508).

2. Electrical Data (Electronic Insert FEL57)

• Supply Voltage (): 9.5…12.5 V DC

• Power Consumption (P_{\max}): 0.15 W

• Signal Output Interface: PFM (Pulse-Frequency Modulation) 2-wire transmission line. Connects to switching amplifiers/controllers such as the Endress+Hauser Nivotester (e.g., FTL325P, FTL375P).

• Explosion Protection: ATEX / IECEx certified for hazardous area deployment (Ex marked).

3. Physical & Environmental Data

• Housing Material: Coated die-cast aluminum enclosure with a separate terminal connection compartment.

• Cable Entry: Standard gland interface (M20 profile thread).

• Process Wetted Parts: High-grade corrosion-resistant stainless steel extension tube and tuning fork assembly.

• Protection Rating: IP66 / IP67 environmental sealing.

4. Extended Order Code Structure (FTL51-GGR2BB7G5A)

• G: Approval variant (Hazardous area ATEX / IECEx approved)

• GR2: Process connection type and size

• B: Probe length ($L = 500\text{ mm}$, 316L material)

• B: Electronics variant (FEL57 SIL 2-wire PFM)

• 7: Housing style (Aluminium, coated)

• G5A: Cable entry and additional option specifications

5. Wiring Diagram & Interface Scheme

PFM 2-Wire Connection to Switching Amplifier:

           [ Terminal 1 ] ( + 9.5...12.5 VDC ) ─────────── ( + PFM Input )
                 │                                                │
             ┌───┴───────────────┐                             ┌──┴───────────────┐
             │  Endress+Hauser   │                             │  Nivotester      │
             │  Liquiphant M     │                             │  Switching Unit  │
             │  Insert: FEL57    │                             │  (e.g., FTL325P) │
             └───┬───────────────┘                             └──┬───────────────┘
                 │                                                │
           [ Terminal 2 ] ( - Signal Return ) ──────────────────── ( - PFM Input ) DATA SHEET