MAGNETOSTRICTIVE LEVEL TRANSMITTER LMT100

High accuracy liquid level and interface level detection

OVERVIEW

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.

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

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

SERVICE

Product commissioning

ABB provides trouble-free start-up and commissioning conducted by a global network of factory-trained experts. A professionally commissioned product ensures process reliability, safe operation and reduced unplanned downtime.

Maintenance and field services

ABB offers different levels of service support to ensure you have access to our experts when you need them. From on-call support through to multi-engineer resident service contracts.

Repairs

ABB provides a complete portfolio of world-class services to ensure maximum performance of our customers equipment and processes.

Spare part services

ABB's global logistics network is strategically positioned to ensure the efficient delivery of spare parts and consumables. A comprehensive spare parts catalog is available free of charge to help you identify the parts you need.

Training

A skilled and efficient workforce is your plant's best asset. ABB's Measurement & Analytics business offers online and in-person training courses for all of our products.

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