LRW Low Range Watercut Meter


LRW™ spool model with included static mixer and manual draw off port

A superior option to traditional BS&W meter technologies, the patented KAM® LRW™ Low Range Watercut meter offers the high accuracy and repeatability of microwave measurement in a package specifically designed for custody transfer and other low-range applications such as LACT units.

Unique to the LRW™, AnyDensity™ technology allows the instrument to compensate for any change in density across the entire API gravity range.* Density compensation is paramount in situations where a single truck or rail unloading site could see changes in API gravity from the teens to the 70’s.

The patented and proven microwave technology used in the LRW™ provides industry-leading accuracy – as low as ±0.03% up to 3% water content. Using high-quality components made and assembled entirely in the USA provide reliable and consistent performance for long-term use. The unit can also easily be calibrated in line.

LRW™ fixed insertion 1.25" NPT model

With insertable and spool/flow through models, the LRW™ also offers installation flexibility that no other unit can match.  Fixed insertion models for line sizes 3" and higher install perpendicular to the line through a 1.25" port. No spool or additional vertical run required. Spools can be custom fabricated for lines from 1-2” or for units replacing other models. Spools can also incorporate static mixing elements to ensure a homogeneous flow and manual draw-off valves key for calibration and verification. For large diameter lines over 8", insertable/retractable units are available that can be installed without having to drain the line.

The KAM® LRW™ is a part of a suite of instruments designed for LACT units and other custody transfer applications which also includes the SMP Static Mixing Plate and the E-IAS Isokinetic Automatic Sampler.

requires density input

CLICK HERE for a white paper on Microwave Resonance Accuracy

Related Links:

API MPMS Technical Report 2570 Continuous On-line Measurement of Water Content in Petroleum

Download LRW Connect Software:

Version 1221 - Models SN# 0151 and up



  • The patented and proven microwave resonance technology used in the KAM LRW™ Low Range Watercut meter allows for extremely high accuracy in a package specifically designed for custody transfer and other low range applications.
  • AnyDensity™ technology allows the instrument to compensate for any change in density across the entire API gravity range (Density input required).


  • Patented microwave resonance technology
  • AnyDensity™ density compensation for full API gravity range
  • Highest accuracy available (0.03%)
  • Automatic temperature correction
  • Spool and insertable models available for maximum installation flexibility
  • Real-time continuous water percentage
  • Local display
  • Up to ANSI 900
  • Easily field calibrated


  • Flow through spool model: 1” or 2” flanged flow through spool
  • Fixed insertion model: 3″ and up pipelines
  • Insertable/retractable model: 3″ and up pipelines


Media: Crude oil, refined products and water
Material: Wetted parts–316 stainless steel**, hastelloy, and PEEK (Other materials available)
stainless steel option available
Enclosure–Copper-free aluminum
Fluid temperature: 32ºF to 176ºF (0ºC to +80ºC)
Ambient temperature: -4°F to 131°F (-20°C to 55°C)
Power requirements: 24 VDC
Power consumption: 12 watts
Available ranges: 0-3%, 0-5%, 0-10%
Accuracy: +/- 0.03% up to 3% water
+/- 0.05% from 3-5% water
+/- 0.1% from 5-10% water
Repeatability: ± 0.01%
Resolution: ± 0.01%
Min. detection: 100 ppm
Outputs: 4–20 mA
Alarm or relay
Temp. correction: Automatic
Pressure ratings: ANSI 150, 300, 600, 900
Density correction: AnyDensity™ compensates for changes in density across entire API gravity range*
Temperature correction: Automatic
Flow conditions:  Well mixed in accordance with KAM recommendations
Hazardous approvals: PTB 08 ATEX 1026
II 2 G Ex db IIB T6 Gb
IECEx PTB 19.0048
Ex db IIB T6 Gb

*requires density input

** Seal Housing for 2″ MNPT Models are Carbon Steel.



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KAM LRW Application Data Sheet

  • DD slash MM slash YYYY

  • Please fill out the following fields to the best of your ability.

  • Pipeline and installation type (please specify units)

Best for LACT units 3" and above
Best for large diameter pipelines
Best for large diameter pipelines
Best for 2" LACTs and capacitance probe replacement
  • Please note: proper mixing in accordance with API Chapter 8.2 is required for accurate OWD performance. In order for KAM to properly quote an OWD, please fill out all flow conditions fields to the best of your ability. Should pipeline mixing be required, the quote will include an appropriate solution to fulfill this requirement (SMS, SMP, or ML).

  • (If yes, a KAM IT Insertion Tool will be required for installation and included in quote)

  • Shaft Calculator

    Determine minimum shaft length for proper insertion in the pipeline using the formula below. See the image for references.

  • This field is for validation purposes and should be left unchanged.