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Horizon™ 704 intermediate guided wave radar transmitter

The Horizon™ 704 is a loop-powered, 24 VDC liquid-level transmitter based upon the revolutionary Guided Wave Radar (GWR) technology. The electronics of the HORIZON 704 is integral mount on the GWR probe and allows local calibration via a 3-push-button keypad / LCD screen.

The transmitter is designed to provide all of the performance advantages of GWR. Available in a non-rotatable, single-compartment plastic or aluminum housing, this transmitter offers simple configuration with three push buttons and a 2-line × 8 character liquid crystal display. The Model 704 covers a broad application range by utilizing coaxial and twin rod probes.

Horizon 704

Guided wave radar

Micropower impulse radar (MIR) combines time domain reflectometry (TDR), equivalent time sampling (ETS), and modern low power circuitry. This synthesis of technologies creates a high-speed Guided Wave Radar (GWR) transmitter. The electromagnetic pulses are propagated via a waveguide that focuses the energy and yields a system many times more efficient than Non-Contact Radar.

Guided wave radar


  • Two-wire, 24 VDC loop-powered level transmitter
  • Low dielectric measurement capability
  • 16 foot (4.90 m) maximum range
  • IS (intrinsically safe), XP (explosion proof), and Non-Sparking approvals


  • HART® digital communications
  • Display/keypad
  • Single compartment cast aluminum or Valox® housing

Operating principle

HORIZON Guided Wave Radar is based upon Time Domain Reflectometry (TDR). TDR utilizes pulses of high frequency electromagnetic energy transmitted down a probe. When a pulse reaches a surface that has a higher dielectric than the vapor space in which it is traveling, the pulse is reflected. High-speed timing circuitry precisely measures the total transit time and provides an accurate measure of the liquid level.

Guided wave radar
Guided wave radar


ATEX Ex ia

Other approvals are available. Consult factory for more details.


Approvals & certificates

ATEX Ex i certificate Horizon 704

Instruction manuals

Horizon TM Model 704 I&O Manual
The Horizon Model 704 Transmitter is an intermediately priced 24 VDC, loop-powered, liquid level transmitter based upon Guided...

Product catalogs

Horizon™ Model 704
The Horizon™ Model 704 Transmitter is an intermediately priced 24 VDC, loop-powered, liquid level transmitter based upon Guided...

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