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Droplet Measurement Technologies (DMT)
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  5. DMT - Model LWC-301 - Hot-Wire Liquid ...

DMT - Model LWC-301 -Hot-Wire Liquid Water Content Sensor

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This compact instrument captures direct measurements of liquid water content (LWC) from 0.05 g/m3 to 3 g/m3, a critical bulk property in atmospheric research.

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Easy Deployment

Easily mount the LWC-301 on manned or unmanned aircraft, cooling towers, and spray rigs.

Easy maintenance

Make replacement quick and easy with an interchangeable circuit card sensor.

Optional Aspirator

Get a self-contained aspirator for ground-based LWC applications – with an external flow indicator that provides easy access to airflow readings.

  • Weather Modification Research
  • Cloud Physics Research
  • Precipitation Characterization
Hotwire sensing
  • The LWC-301 features a coiled wire that is maintained at 150 °C, which acts as variable resistance in a Wheatstone Bridge circuit.
  • The resistance of the sensing coil is directly proportional to its temperature.
  • Power dissipated by the sensor to maintain temperature is used to calculate vaporization, and in turn, liquid water content.
  • Measured Parameters : Liquid water content in the 0-3 g/m3 range
  • Air Speed Range : 0 – 200 m/sec
  • Calibration : Not Required
  • Frequency Response : >25 Hz
  • Output : RS-422 Serial Communication
  • Special Features : 
    • Interchangeable circuit card sensor
    • Pulse width modulation control (avoids overheating of the power transistor and hotwire coil)
    • Mounting : 2.5-inch diameter B.C. Rosemount pattern mounting
  • Power Requirements : 
    • System power: 28 VDC, 7.5 A max
    • Anti-ice power: 28 VDC, 8.0 A
  • Weight : 
    • Electronics box: 500 g
    • Sensor strut: 600 g
  • Dimensions : 
    • Sensor strut with strut mount: 11.5 cm W x 6.4 cm L x 19.5 cm H (41/2” W x 2 1/2” L x 7 5/8“ H)
    • Electronics box: 12.1 cm W x 12.1 cm L x 6.7 cm H (43/4” W x 43/4” L x 25/8” H)
    • Electronics box mounting plate: 9.7 cm W x 15.3 cm L x 0.3 cm H (3.8” W x 6.0“ L x 0.1” H)
  • Operating Limits : 
    • 0 -12 km altitude
    • -40 to +40 °C
    • 0 – 100% RH
  • PADS software and laptop
  • Aspirator

The Lifecycle Care Program ensures LWC integrity and performance vital to your research mission for 3 years or 3 calls (whichever comes first). When conducting complex and time intensive laboratory or field measurements it is critical to avoid down time, and ensure data collection accuracy. The program consists of 3 key deliverables for each year or call:

  • Instrument Logistics
  • Instrument Integrity
  • Instrument Performance

Lifecycle Care Program Includes:

LOGISTICS

  • Shipping to and from Droplet Measurement Technologies facility
  • Customs handling, including CARNET ATA if required

INTEGRITY

  • Incoming instrument evaluation and health check

PERFORMANCE

  • Software and firmware validation
  • 100%-unit functionality test
  • Calibration data
  • Calibration report
  • Certificate of calibration

At times, our technician might discover an instrument issue, which might not be covered by the Lifecycle Care Program or by our product warranty. In such case we will reach out to you with a service & repair estimate to allow you to provide us with the next steps of action.