Datasheet summary
Levelflex FMP51
PDF datasheet mirror for Levelflex FMP51 (Endress + Hauser Level measurement). Verify with OEM before design.
Summary
Product identification
The Levelflex FMP51 is a guided wave radar level and interface measurement instrument. It utilizes the time-of-flight method (TDR).
Application
This instrument is designed for level and interface measurement in liquids.
- Probe types: Rod, rope, or coax probes are available.
- Process connections: Starts from 3/4" thread, flanges, or hygienic connections (Tri-Clamp, 11851).
- Process temperature range: –196 to +450 °C (–320 to +842 °F).
- Process pressure range: –1 to +400 bar (–14.5 to +5 800 psi).
- Maximum measuring range:
- Rod probe: 10 m (33 ft)
- Rope probe: 45 m (148 ft)
- Coax probe: 6 m (20 ft)
- Accuracy: ±2 mm (±0.08 in).
- Certificates and Approvals: Includes international explosion protection certificates, WHG, marine approval, steam boiler approval, and EN10204-3.1. Linearity protocols (3-point, 5-point) are available.
Key Features and Benefits
- Reliable measurement under changing product and process conditions.
- HistoROM data management for easy commissioning, maintenance, and diagnostics.
- High reliability with Multi-Echo Tracking technology.
- Hardware and software developed according to IEC 61508 (up to SIL3).
- Seamless integration into control or asset management systems.
- Intuitive user interface with national language support.
- Bluetooth® wireless technology for commissioning, operation, and maintenance via the SmartBlue app (iOS/Android).
- Easy proof testing for SIL and WHG.
- Heartbeat Technology™.
Measuring Principle
The Levelflex operates using the time-of-flight method, also known as TDR (Time Domain Reflectometry). High-frequency pulses are sent along a probe, reflected by the product surface, and the time taken for the pulse to return is converted into a distance measurement.
- The distance (D) to the product surface is calculated as: D = c · t/2, where 'c' is the speed of light and 't' is the time of flight.
- The level (L) is then calculated based on the empty distance (E): L = E – D.
- Interference echo suppression functions are available to prevent false readings from internal tank fixtures.
Interface Measurement
For interface measurement, the instrument utilizes the reflection from the surface of the upper medium and the interface between two media with different dielectric constants (DC).
Conditions for Interface Measurement:
- The DC of the upper medium must be known and constant (though FMP55 may allow for changing DC under certain conditions).
- The DC of the upper medium should not be greater than 10.
- The DC difference between the upper and lower medium must be >10.
- The upper medium must have a minimum thickness of 60 mm (2.4 in).
- Emulsion layers up to 50 mm (2 in) are admissible; thicker layers can attenuate the signal.
Measuring System and Probes
- Rod probes: Available in inseparable lengths up to 4 m (13 ft) and separable lengths up to 10 m (33 ft). Materials include 316L and Alloy C.
- Rope probes: Maximum length of 45 m (148 ft). Materials include 316L and Alloy C.
- Coax probes: Maximum length of 6 m (20 ft). Materials include 316L (multiple holes) and Alloy C (one hole).
- FMP52: Designed for corrosive liquids, with PFA-coated rod and rope probes.
- FMP54: Standard offerings for rod, rope, and coax probes.
Measuring Range by Media Group (FMP51, FMP54)
| Media Group | εr | Typical liquids | Bare metallic rod probes | Bare metallic rope probes | Coax probes |
|---|---|---|---|---|---|
| 1 | 1.4 to 1.6 | Liquefied gases, e.g., N2, CO2 | On request | 6 m (20 ft) | 6 m (20 ft) |
| 2 | 1.6 to 1.9 | Liquefied gas, solvents, Freon, Palm oil | One-piece: 4 m (13 ft); Separable: 10 m (33 ft) | 15 to 22 m (49 to 72 ft) | 6 m (20 ft) |
| 3 | 1.9 to 2.5 | Mineral oils, fuels | One-piece: 4 m (13 ft); Separable: 10 m (33 ft) | 22 to 32 m (72 to 105 ft) | 6 m (20 ft) |
| 4 | 2.5 to 4 | Benzene, styrene, toluene, Furan, Naphthalene | One-piece: 4 m (13 ft); Separable: 10 m (33 ft) | 32 to 42 m (105 to 138 ft) | 6 m (20 ft) |
| 5 | 4 to 7 | Chlorobenzene, chloroform, Nitrocellulose lacquers | One-piece: 4 m (13 ft); Separable: 10 m (33 ft) | 42 to 45 m (138 to 148 ft) | 6 m (20 ft) |
| 6 | > 7 | Aqueous solutions, Alcohols, Ammonia | One-piece: 4 m (13 ft); Separable: 10 m (33 ft) | 45 m (148 ft) | 6 m (20 ft) |
- The measuring range for interface measurements is limited to 10 m (33 ft).
Measuring Range by Media Group (FMP52 - PFA-coated)
| Media Group | εr | Typical liquids | PFA-coated rod probes | PFA-coated rope probes |
|---|---|---|---|---|
| 1 | 1.4 to 1.6 | Liquefied gases, e.g., N2, CO2 | — | — |
| 2 | 1.6 to 1.9 | Liquefied gas, solvents, Freon, Palm oil | 4 m (13 ft) | 9 to 14 m (30 to 46 ft) |
| 3 | 1.9 to 2.5 | Mineral oils, fuels | 4 m (13 ft) | 14 to 21 m (46 to 69 ft) |
| 4 | 2.5 to 4 | Benzene, styrene, toluene, Furan, Naphthalene | 4 m (13 ft) | 21 to 28 m (69 to 92 ft) |
| 5 | 4 to 7 | Chlorobenzene, chloroform, Nitrocellulose lacquers | 4 m (13 ft) | 28 to 32 m (92 to 105 ft) |
| 6 | > 7 | Aqueous solutions, Alcohols, Acids, alkalis | 4 m (13 ft) | 32 to 45 m (105 to 148 ft) |
- The measuring range for interface measurement is limited to 10 m.
Blocking Distance
- Coax probes: 0 mm (0 in)
- Rod and rope probes up to 8 m (26 ft): 200 mm (8 in)
- Rod and rope probes over 8 m (26 ft): 0.025 × probe length
- For media with DC > 7, the blocking distance can generally be reduced to 100 mm (4 in) for rod and rope probes.
- No blocking distance applies in bypass/stilling wells.
- A safety distance (SD) can be defined to provide a warning when the level approaches it.
Output Signals
- HART: FSK ±0.5 mA over current signal, 1200 Bit/s data transmission rate, galvanically isolated.
- Bluetooth®: Requires order code 610, option NF. Operates via SmartBlue app with a range > 10 m (33 ft) under reference conditions. Features encrypted communication.
- PROFIBUS PA: Manchester Bus Powered (MBP), 31.25 kBit/s, Voltage mode, galvanically isolated.
- FOUNDATION Fieldbus: Manchester Bus Powered (MBP), 31.25 kBit/s, Voltage mode, galvanically isolated.
- Switch output (Optional for HART): Open collector switch output, binary switching behavior, failure mode non-conductive. Electrical connection data: U = 16 to 35 VDC, I = 0 to 40 mA. User-programmable switch-on/off points and delay.
Signal on Alarm
Failure information can be displayed via:
- Current output: Choice of failure mode (NAMUR NE 43), e.g., 3.6 mA (minimum alarm) or 22 mA (maximum alarm, factory setting), or user-configurable value (3.59 to 22.5 mA).
- Local display: Status signal (NAMUR NE 107) and plain text.
- Operating tool (HART, PROFIBUS PA, FOUNDATION Fieldbus, service interface): Status signal (NAMUR NE 107) and plain text.
Linearization
Allows conversion of measured values to volume or mass units using up to 32 value pairs. Preprogrammed tables for cylindrical vessels are available.
Protocol-Specific Data
HART
- Manufacturer ID: 17 (0x11)
- Device Type ID: 0x1122
- HART Specification: 7.0
- HART Load: min. 250 Ω
- Supported functions: Burst mode, additional transmitter status.
- Wireless HART: Minimum starting voltage 17.5 V, start-up current 4 mA, starting time 80 s.
PROFIBUS PA
- Manufacturer ID: 17 (0x11)
- Ident Number: 0x1558
- Profile Version: 3.02
- Supported functions: Identification & Maintenance, Automatic Ident Number Adoption, Physical Layer Diagnostics, PROFIBUS upload/download, Condensed status.
FOUNDATION Fieldbus
- Manufacturer ID: 0x452B48
- Device Type: 0x1028
- Device Revision: 0x01
- ITK Version: 6.0.1
- Link Master capability (LAS): Yes
- Supported functions: Restart, ENP Restart, Setup, Linearization, Self Check.
Power Supply
- External power supply required.
- Various supply units are available from Endress+Hauser.
2-wire, 4-20mA HART, passive
- Terminal voltage at device: 11.5 to 35 V (non-Ex) / 11.5 to 30 V (Ex ia) / 13.5 to 30 V (Ex d).
- Maximum load depends on supply voltage (U0). See table for details.
- Note: Minimum voltages may increase at extreme ambient temperatures or when using the Bluetooth modem.
4-wire, 4-20mA HART, active
- 90-253 VAC (50-60 Hz): Maximum load 500 Ω.
- 10.4 to 48 VDC: Maximum load 500 Ω.
PROFIBUS PA, FOUNDATION Fieldbus
- Power supply and output are combined. Specific voltage and load requirements are detailed in the full documentation.
Device Plugs
M12 and 7/8" plugs are available, allowing signal cable connection without opening the housing.
- M12 plug pin assignment: Signal +, Not assigned, Signal -, Ground.
- 7/8" plug pin assignment: Signal -, Signal +, Not assigned, Shielding.
Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.
Official datasheet (PDF)
Curated from selected public technical reference material for discovery and preliminary comparison. This summary is not a substitute for a current certified manufacturer datasheet. Verify revisions and design limits before use.