Magnetostrictive Level Transmitter LMT100

High accuracy 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. The LMT100 is also available with optional temperature measurement.
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Overview

The LMT100 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 measurement which is proportional to the level of the float.

LMT100 is preferred for:
• Interface Measurement
• Exceptional performance with emulsion
• Measurement with foam on layers fluid surface
• Hydrocarbons and chemical control

Features:

  • High accuracy: 0.01% of full scale or + 1.27mm
  • Never requires re-calibration: set it & forget it
  • Superior Sensor (Patent #5,473,245)
  • Local indication with HMI display
  • Dual compartment housing with separate field
    terminal compartment
  • Loop powered to 22m (75ft) probe length
  • Total and/or interface level measurement
  • Pressure to 165.48 bar (2400 psig) Std. 124.1 bar (1800 psig)
  • Temperature range: -195.5 to 426.6ºC (-320 to 800ºF)
    with options
  • Field replaceable/upgradable electronics module
  • Built-in RFI/EMI filter
  • Digital communications

Options:

  • Two level indications
  • RTD for process temperature measurement
  • Glass viewing window
  • 316/L Stainless Steel enclosure
  • 21-point linearization table

Data

  • ELECTRONIC TRANSMITTERRepeatability: ± 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
    Temperature sensor (optional): 1000 ohm Pt RTD, option code SER or STL
    Temperature tolerance class: IEC 60751 Class B, + (0.3+0.005[t]), -700 to 2300C
    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 4XNotes:
    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

    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

    Process temperature:
    Standard: -195.5 to 121.1ºC (-320 to 250ºF)
    Options:   up to 427ºC (800ºF) with options

    Process pressure:
    Standard: -1.0 to 124.1 bar @ 149ºC (-14.7 to 1800 psig @ 300ºF)
    Options:   165.47 bar (2400 psig) maximum with the HP probe type

    Probe length:
    Standard: 304.8mm to 9.14m (1 to 30 ft)
    Options:   22.86m (75ft) maximum w/ W7 flexible probe in sensor well

    Probe length tolerance:
    Standard/Options: ± 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 22.86m (75ft)

    Mounting:
    Standard:3/4 in MNPT compression fitting
    Options:plugs, threaded fittings, loose flanges a

Download

Data sheet – LMT100 | Magnetostrictive level transmitter

Safety manual – LMT Series | Safety manual for magnetostrictive level transmitter

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