Magnetostrictive Level Transmitter LMT200

High accuracy non-intrusive liquid level and interface level detection


The LMT Series of level transmitters is a modular range of field mounted, advanced microprocessor-based electronic transmitters, utilizing multiple sensor technologies. Accurate and reliable measurement of liquid level and interface are provided in even the most difficult and hazardous  industrial environments.

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Magnetostrictive Level Transmitter

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Overview: Transmitter Features

ABB brings the next generation magnetostrictive level transmitter to make measurement easy for customers. The LMT Series is designed to further advance the ease of use, safety and reliability for Liquid Level and Interface measurement.
Overview: Magnetostrictive Technology

The LMT200, based on the magnetostrictive principle, is the preferred choice for liquid level and interface measurements. The patented sensor with the advance electronics provides safe and reliable measurement even in the most difficult and hazardous industrial applications.
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LMT Series - Operating Principle

ABB's K-TEK level products' patented sensor technology in the next generation LMT Series magnetostrictive level transmitters.
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LMT Series - Applications

The LMT level measurement solution for your toughest applications in industries like oil and gas, chemicals, refineries, and power generation.
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LMT Series - Manufacturing in the USA

ABB's SIL certified LMT Series uses the industry’s most advanced technology in magnetostrictive liquid level measurement and manufactured in a world-class facility!
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Overview

The LMT200 is based upon the magnetostrictive principle.

1. The device electronics generates a low energy current
pulse at fixed intervals.
2. The electrical pulses create a magnetic field which
travels down a specialized wire inside the sensor tube.
3. The interaction of the magnetic field around the wire
and the magnetic float causes a torsional stress wave
to be induced in the wire. This torsion propagates
along the wire at a known velocity, from the position of
the magnetic float and toward both ends of the wire.
4. A patented sensing element placed in the transmitter
assembly converts the received mechanical torsion
into an electrical return pulse.
5. The microprocessor-based electronics measures the
elapsed time between the start and return pulses
(Time of Flight) and converts it into a position measure-
ment which is proportional to the level of the float.

Features:

  • Calibrated from the factory
  • High Accuracy: .01% of Full Scale or +/- 1.27mm
  • Never Requires Re-Calibration: Set It & Forget It
  • Easy setup with waveform display
  • Not affected by agitation, foam or emulsion layers
  • No oscilloscope required
  • Designed to Mount Externally to K-TEK KM26 or other
    Magnetic Level Gauge
  • Superior Sensor (Patent #5,473,245)
  • Local Indication with HMI Display
  • Dual Compartment Housing with Separate Field Terminal
    Compartment
  • Loop Powered to 15.24m (50ft) Probe Length
  • Total and/or Interface Level Measurement
  • Temperature Range: -195.5 to 426.6ºC (-320 to 800ºF)
     with options
  • Field Replaceable / Upgradable Electronics Module
  • Built-in RFI / EMI Filter
  • Digital Communications
  • Online Self-verification

Options:

  • Two Level Indications
  • Glass Viewing Window
  • 316 Stainless Steel Enclosure
  • Built-in surge protection

Data

ELECTRONIC TRANSMITTER

Repeatability: ± 0.005% of Full Scale or 0.305 mm (0.012 in), whichever is greater
Non-linearity: ± 0.01% of Full Scale or 0.864 mm (0.034in), whichever is greater
Measuring accuracy: ± 0.01% of Full Scale or 1.27 mm (0.050 in), whichever is greater1
Supply voltage: 12 to 42 Vdc - 4-20mA HART loop powered
Output/Communications: 4-20mA HART7®
User Interface: Interactive display, DTM, EDDL with NE107 messaging
Power consumption:
4-20mA:                           at 36.0 Vdc - 3.6mA 0.13 watts; 21mA 0.76 watts
                                         at 12.0 Vdc - 3.6mA 0.043 watts; 21mA 0.25 watts 
HART mode (4.0mA):      at 36.0 Vdc 0.144 watts
                                         at 12.0 Vdc 0.048 watts
Maximum line resistance:
4-20mA:                           at 36.0 Vdc and 21mA, 1142 ohms* 
                                         at 24.0 Vdc and 21mA, 571 ohms
                                         at 12 Vdc and 21mA, < 72 ohms**    
                                         *Maximum allowable with HART® communication is 700 ohms
                                         **See the current/resistance chart
HART mode (4.0mA):       < 650 to 700 ohms
Polarity protection: 4-20mA, Diode in series with loop, FOUNDATION Fieldbus and Profibus PA, polarity insensitive
Update rate: 10 measurements per second
Minimum measuring span: 76.2 mm (3.0 in), consult factory if smaller span is required
Damping: Field Adjustable, Range: 0.1 to 60 seconds
Alarm output: NE43, Software or Hardware selectable. Upscale (21 mA) or Downscale (3.6 mA)
Surge Suppression Integral surge suppression available with option code S1
Ambient temperature: -40 to 85ºC (-40 to 185ºF) Ambient2
Humidity: 0 to 100% RH
Linearization: 21 Point Table Available
Enclosure: Dual Compartment
Enclosure material: Cast Low Copper Aluminum with Powder Coat or 316 Stainless Steel
Device tag material: AISI 316 Stainless Steel
Electrical connection: Two M20 x 1.5 or two 1/2in. FNPT, adapters and bus connectors also available
Ingress protection: IP66, NEMA 4X

SENSOR TUBE

Material:
Standard: 316/L Stainless Steel
Options:   Alloy 20, Hastelloy® C-276, FEP-TEFLON® jacketed, electropolished 316/316L Stainless Steel, others on request

Standard probe length: 304.8mm to 15.24 m (1 to 50 ft); 90 degree probes (SEH Option) 304.8mm to 7.62m (1 to 25 ft)

Probe length tolerance:
± 3.2mm (0.125in) up to 3.0m (10ft); +/- 6.4mm (0.25in) up to 6.0m (20ft);
± 9.0mm (0.35in) up to 9.0m (29.5ft); +/- 25.4mm (1.0in) up to 15.24m (50ft)

Mounting:  Stainless Steel Clamps for KM26 Magnetic Level Gauge Chamber Included; Optional Vibration Isolation Mounts

Notes:
1 Measurement accuracy is recorded at factory ambient conditions (23.88 °F +/-5.6 °C (75 °F +/-10 °F)) using a calibration magnet. Accuracy may be further influenced by
other factors such as float hysteresis, installation, process conditions and ambient conditions.
2 Some agency approvals may differ.

 HART® is a registered trademark of the FieldComm Group

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