LQ500 Microwave Consistency Transmitter

Puts You In Control of Your Paper Machine Performance

Decade of proven industry performance Patented technology based on Phase-difference measurement of microwave signal creates result of highly accurate measurement (resolution, linearity and repeatability) over the full range of consistency. Accurate, total consistency measurement unlike other shear force technology, the LQ500 is unaffected by variations in pulp species, fiber length, and freeness. Unlike other shear force technology, the LQ500 is immune to changes in process conditions such as flow rate, pressure, and temperature. The LQ500 measures fibers and fillers for excellent total consistency control and reduction in basis weight variability.

Remote display unit
Remote electronics offers large, easily visible display for virtually unrestricted installation. Intuitive, menudriven interface features simple set-up, calibration and troubleshooting functions.

Excellent reliability
The LQ 300 has proven to have excellent reliability without failures, its successor LQ500 reliability has been even improved further. Depend on LQ500 for a reliable and maintenance-free product. 

Measurement principle
The figure below illustrates the clear linear relationship between pulp consistency and phase and phase (i.e., phasedifference) of a wave transmitted through the clear water and then it is passed through the pulp of higher consistency and comparing them against the wave's original of phase of water.

Accurate measurements are achieved since contaminants do not affect the phase difference measurement
Since contaminants do not easily affect the LQ500 there is an excellent direct relationship between the phase difference and the consistency. Accurate measurement is realized over a wide range from low consistency to high consistency.

High reliability,easy maintenance
No moving parts and no in-line projections guarantee high reliability and minimal maintenance requirements.The absence of moving parts also greatly reduces costs for consumables like O-rings and bearings.

Easy operation
Setting the measurement range and calibrating the meter are easily done via key operations while viewing the LCD display.

Configuration diagram for communication

 

 

Manufacturer:Toshiba Corporation; Tokyo, Japan; http://www.toshiba.com/ind

LQ500 Microwave Consistency Transmitter features:

• Reliable-proven with over 1500 installations
• No moving parts, No regular maintenance
• Excellent Repeability, Linearity and Resolution
• Single point calibration
• Immune for process conditions change
  • Flow rate, pressure, temperature, turbulence
• Immune for wood species change
  • Varying pulp grade, Fiber length, Freeness, Brightness, Color, Shives
• Total Solids measurement
  • Measures fillers, excellent for basis weight control

Popular Applications:Popular Applications:

• Machine Chests
• Broke Chests
• Couch pit & press pit
• HD Towers
• Blending chests
• Stuff Box
• Bleach Plant stock feed
• Groundwood
• TMP CMTP
• Fiber balance calculation
• Black liquor agitation

Materials of Construction:

• Sensor: SS 316
• Window: Polysulfone
• Sealing: Fluoricrubber

Specifications:

• Measuring range 0 - 50% Total Solids
• Resolution: 0.001 % (0,002 for 50mm size)
• Repeatability 0.01% (0,02 for 50mm size)
• Fluid Temperature: 0 to 100 ºC (32 to 212 ºF)
• Max. Conductivity
  • Size    Limit
  • 3"      16 mS/cm
  • 4"      15 mS/cm
  • 6"      10 mS/cm
  • 8"       8 mS/cm
  • 10"     8 mS/cm
  • 12"     6 mS/cm