Product Description

The QTS Guided Wave Radar delivers an independent reading of liquid and solid levels. These top mount, direct insertion radars measure interface and direct level of liquids and solids, both of high and low pressures and temperatures. GWR technology provides dependable level indication through pulsating high-frequency microwave energy down the probe within a bypass chamber. A GWR will read the true level of the process, even in the density diverges over time.

Principles of Operation

Microwave pulses guided down a probe, reaching the process a signal is reflected back. The time difference between sending and receiving a single is measured, the product of which is the level and/or interface level reading of the process.

Product Features

  • Precise and dependable readings
  • Maintenance-free
  • Multivariable output readings – total level or interface
  • Top/Mount design provides easy fit to chambers
  • Extensive selection of materials and process connections
  • High pressure / high temperature applications available

Product Specifications

System Design

Measurement Principle Guided time-of-flight via time domain reflectometry


Measurement Variable Level, determined by the time-of-flight of a guided radar pulse from transmitter to product surface and back
Zero and Span 6 inches to 75 feet ( 15 to 2286 cm)

User Interface

Keypad 3-button menu-driven data entry and system security
Indication 2-line x 8-character display
Digital Communication HART, Fieldbus
Minimum Operating Voltage 9 VDC
Quiescent Current Draw 15 mA
DEV Revision 0X01
Function Blocks Al_1, Al_2, Al_3, Al_4
Damping Adjustable 0-10 seconds


(Measured at instrument terminals)

General Purpose / Explosion Proof 9 to 32 VDC ( 15 mA maximum current draw)
IS/FISCO/FNICO 9 to 32 VDC ( 15 mA maximum current draw)


Material Aluminum A356T6 (<0.20% copper), optional 316 SST
Cable Entry ¾” NPT and M20


Operating Temperature -196 to +842°F (-320 to +450°C) Model Dependent
Pressure Vacuum -14.5 to 5,800psi (Vacuum -1 to +400bar) Model Dependent
Display Function Operating Temperature -5 to +160°F (-20 to +70°C)
Storage Temperature -50 to +175°F (-40 to +80°C)
Humidity 0-99%, non-condensing
Electromagnetic Compatibility Meets CE Requirements: EN 50081-2, EN 50082-2
Shock Class ANSI/ISA-S71.03 Class SA1
Vibration Class ANSI/ISA0S71.03 Class VC2
Reference Conditions Reflection from water +70°F (+20°C) with 72” coaxial probe (CFD threshold)
Linearity Coaxial/Twin Rod Probes: <0.1% of probe length or 0.1 inch (whichever is greater)
Single Rod Probes:  <0.3% of probe length or 0.3 inch (whichever is greater)
Measured Error Coaxial/Twin Rod Probes:  ±0.1% of probe length or 0.1 inch (whichever is greater)
Single Rod Probes:  ±0.5% of probe length or 0.5 inch (whichever is greater)
Resolution ±0.1 inch
Repeatability <0.1 Inch
Hysteresis <0.1 Inch
Response Time <1 second
Warm-up Time <5 seconds
Operating Temp. Range -40° to +175°F (-40° to +80°C)
LCD Temp. Range -5° to +160°F (-20° to +70°C)
Ambient Temp. Effect Approximately +0.02% of probe length/ °C
Process Dielectric Effect <0.3 inch within select range
Humidity 0-99%, non-condensing
Electromagnetic Compatibility Meets CE Requirements (EN-61000-6-2/2001, 61000-6-4/2001)

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