LMT200

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