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 PrincipleGuided time-of-flight via time domain reflectometry


Measurement VariableLevel, determined by the time-of-flight of a guided radar pulse from transmitter to product surface and back
Zero and Span6 inches to 75 feet ( 15 to 2286 cm)

User Interface

Keypad3-button menu-driven data entry and system security
Indication2-line x 8-character display
Digital CommunicationHART, Fieldbus
Minimum Operating Voltage9 VDC
Quiescent Current Draw15 mA
DEV Revision0X01
Function BlocksAl_1, Al_2, Al_3, Al_4
DampingAdjustable 0-10 seconds


(Measured at instrument terminals)

General Purpose / Explosion Proof9 to 32 VDC ( 15 mA maximum current draw)
IS/FISCO/FNICO9 to 32 VDC ( 15 mA maximum current draw)


MaterialAluminum A356T6 (<0.20% copper), optional 316 SST
Cable Entry¾” NPT and M20


Operating Temperature-196 to +842°F (-320 to +450°C) Model Dependent
PressureVacuum -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)
Humidity0-99%, non-condensing
Electromagnetic CompatibilityMeets CE Requirements: EN 50081-2, EN 50082-2
Shock ClassANSI/ISA-S71.03 Class SA1
Vibration ClassANSI/ISA0S71.03 Class VC2
Reference ConditionsReflection from water +70°F (+20°C) with 72” coaxial probe (CFD threshold)
LinearityCoaxial/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 ErrorCoaxial/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. EffectApproximately +0.02% of probe length/ °C
Process Dielectric Effect<0.3 inch within select range
Humidity0-99%, non-condensing
Electromagnetic CompatibilityMeets CE Requirements (EN-61000-6-2/2001, 61000-6-4/2001)

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