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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The LMT100 is based upon the magnetostrictive principle.
- The device electronics generates a low energy current pulse at fixed intervals.
- The electrical pulses create a magnetic field which travels down a specialized wire inside the sensor tube.
- 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.
- A patented sensing element placed in the transmitter assembly converts the received mechanical torsion into an electrical return pulse.
- 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
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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
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