ABB Level LMT100-2 Floats


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


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 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 4X 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 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
Process Instrumentation
Level Measurement

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