User's Manual

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Accu-Wave Level Gauge

Installation Instructions - Draft

Introduction

The Accu-Wave Model 1440 Radar Level Gauge uses a microwave signal to

continuously measure the level of the process material. The transmitted microwave

signal is reflected off of the surface of the process material. The Digital Signal

Processing (DSP) software detects this reflection or echo and computes the

distance to the liquid or solid material in the tank. The Accu-Wave firmware then

uses the distance measurement to calculate level, volume, and other user-selected

measurements.

The Accu-Wave Radar Level Gauge consists of an integrated sensor and

transmitter. The microwave and transmitter circuitry are combined on a single

board. Initially, the Accu-Wave will be available with dielectric rod antennas

(probes). Horn antennas will be provided as a future option.

Antennas

The standard antenna configuration for the Accu-Wave gauge consists of a

dielectric-filled, 1 inch O.D. stainless steel waveguide with a dielectric rod

antenna. Polypropylene or Teflon (PTFE) antennas are available. The stainless

steel (SS 316) waveguide material is swaged (crimped) over the dielectric-fill

material. The swage serves both as a process seal as well as a pressure seal.

Future options for the dielectric rod antennas will include Hastelloy waveguides

and a fully-jacketed configuration where the only material exposed to the process

will be Teflon (PFA).

In addition, horn antennas will be available in the future, with horn diameters

ranging from 2 to 8 inches. For the horn antenna configuration, all materials

exposed to the process are constructed of stainless steel (SS 316) and Teflon.

Mounting Configurations

The dielectric rod antennas are fitted with a 1-inch NPT threaded bushing, welded

to the waveguide. Flanges are also available – 150 lb. or 300 lb., with diameters

ranging from 2 to 8 inches. The waveguides are available in 6, 9, 12, or 15 inch

lengths, where the length refers to the portion of the waveguide that extends below

the bushing or the flange. For optimum performance the end of the waveguide

should reach to the bottom of the nozzle. Level measurements can be made with

the process material above the antenna to within ~3.5 inches of the antenna

waveguide; however; measurement accuracy will be degraded.

Horn antennas are provided with welded flanges.

Summary of content (4 pages)

PAGE 1
Accu-Wave Level Gauge Installation Instructions - Draft Introduction The Accu-Wave Model 1440 Radar Level Gauge uses a microwave signal to continuously measure the level of the process material. The transmitted microwave signal is reflected off of the surface of the process material. The Digital Signal Processing (DSP) software detects this reflection or echo and computes the distance to the liquid or solid material in the tank.
PAGE 2
Communications RS-485 and RS-232 (optional) serial ports are provided to support communications with the gauge via a remote terminal, a PC with terminal emulation software, or a TN Technologies' Hand Held Terminal. Current Output The gauge provides a 4-20 mA, loop-powered (24 Vdc) current output. Setting Up and Using the Gauge The companion manual “Accu-Wave Operation Manual” (717791) provides detailed information on how to set up the Accu-Wave software and operate the Accu-Wave gauge.
PAGE 3
• Turbulence, splashing, or waves such as those caused by filling, recirculation, or sparging of light material entrances near the bottom of the tank. • Pipe entrances near the top or side of the tank. • Agitator blade passing directly through the beam path. • Vortices caused by baffles, drains, or any other obstructions. 4. The mounting location should also avoid horizontal structural surfaces such as baffle support brackets or side wall joints as these surfaces reflect a strong false signal. 5.
PAGE 4
Install the bolts and washers, and attach the nuts. Tighten the bolts in a star– patterned sequence to equalize compression. Unless otherwise specified, use a torque specification of 50 foot pounds. For 1 inch, NPT bushing configurations, simply thread the bushing into the corresponding opening on the tank. To adapt to a flange mounting, simply use a tapped flange that will accept the 1 inch NPT bushing.