High accuracy non-intrusive 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.
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- The LMT200 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 measurement 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
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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
- 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
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