LMT100

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 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

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 - 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 a