Dwyer Series GWB Guided Wave Radar Transmitter for Solids

Method of operation

The GWB senses low-energy, high-frequency electromagnetic impulses, produced by the sensor which are transmitted along the probe immersed in the fluid to be measured. When these impulses hit the surface of the liquid, part of the impulse energy is reflected back up the probe to the senor which then utilizes the time difference between the impulses sent and the impulses reflected to determine the fluid level.

Features & Benefits

  • Precise continuous level measurement and reliable point level detection.
  • Disturbance signal suppression.
  • Simple installation.
  • HART® Communication protocol.
  • Economical.
  • No density or conductivity restrictions.
  • Zero and full span adjustable within measuring range (length minus the top and bottom dead bands).


Service: Compatible, non-combustible powder and bulk materials.

Wetted Materials:
316 SS rod: 316 L SS, PEEK & Klingersil;
Wire cable: 316 SS, PEEK & Klingersil.

Accuracy: ±0.12″.

Repeatability: < 0.08″.

Resolution: < 0.04″.

Dielectric Constant : 316 SS rod/wire cable: > 1.8.

Dynamic Viscosity: 316 SS rod/wire cable: < 5.00 mPa; s=5.000 cP; 316 SS.

Velocity of Level Change: < 3.2 fps.

Start-Up Time: < 6 s.

Temperature Limits:
Ambient: -13 to 176°F (-25 to 80°C);
Process: -40 to 302°F (-40 to 150°C).

Pressure Limits: -14.5 to 580 psi (-1 to 40 bar).

Output Signal: Analog or switch type.

Analog Output: 4 to 20 mA.

Switch Type: SPST, NC.

Power Requirements: 12 to 30 VDC.

Electrical Rating: 70 mA @ 24 VDC.

Mounting Orientation: Vertical.

Response Time: 0.5 s, 2 s, 5 s selectable.

Electrical Connection: Screwless, cage clamp terminal block for stranded and solid wires AWG 22-14.

Conduit Connection: 1/2″ NP or M20.

Process Connection: 1″ male NPT or 1″ male G.

Enclosure Rating: NEMA 4X (IP66).

Weight: 2.09 lb (0.95 kg).