Level Measurement & Control

Ultrasonic Level transmitter for liquids and solids

April 2000 Level Measurement & Control

The Hawk HA Series ultrasonic level transmitter is available in 5, 10, 20 and 30 kHz models to suit a variety of applications, environments and vessel sizes.

The instrument has a 4-20 mA analog output, as well as a 'remote' press-to-test failsafe feature for critical level applications. Independent relays for level alarms are also available.

The HA Series is available in an integral version, with electronics and housing mounted directly onto the transducer, or as a remote transmitter version for high temperature applications.

The ultrasonic transmitter emits an ultrasonic pulse which is reflected back from the product being measured. The reflected signal or echo, is processed using Hawk-developed software to enhance the correct echo and reject false or spurious echoes. The distance from the transducer to the product is calculated using the speed of sound through air and the return time of the reflected echo from the product. The measured distance is automatically temperature compensated, to ensure accuracy, and is compared to the programmed ‘span’ (0–100%) and relay setpoints for output status.

The analog output is 4–20 mA and there are two relays on the integral version and four relays on the remote version.

Some Hawk HA features include:

* Noncontact point level detection (max 80 m).

* Simple to set up and commission.

* 12, 24 and 48 V d.c. power supply.

* 110, 220 or 240 V a.c. 50/60 Hz supply.

* Liquids, slurries, solids, powders can be measured.

* Auto compensation for steam, dust, condensation, etc.

* Impact resistant IP67 rated enclosure. Metal/polycarbonate.

* Programmable failsafe output mode.

* Remote failsafe test facility.

* Programmable failsafe timer.

* Agitator discrimination.

* Eight-digit display with operating diagnostics.

* Selectable display mode (space or material).

* Max temperature: remote amplifier version with hi-temp transducer = 175°C.

Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Radar instruments in mining
VEGA Controls SA Level Measurement & Control
VEGA radar measuring instruments hold their own in the difficult environments of gold and platinum mining.

Level switch for storage bins
GHM Messtechnik SA Level Measurement & Control
Val.Co has introduced a new LPM level switch specifically designed to control the storage of dusts, granules and solid products.

Specialist instrumentation for specialised applications
GHM Messtechnik SA Level Measurement & Control
Over 30 years of experience puts Val.co at the forefront to supply specialist liquid level, flow, pressure and temperature instrumentation.

Radar transmitter ensures efficiency at Australian mine
VEGA Controls SA Level Measurement & Control
To eliminate supply bottlenecks at an Australian iron ore mine, the processes were better coordinated with VEGAPULS 69 playing an important role.

High-reliability float switch
ASSTech Process Electronics + Instrumentation Level Measurement & Control
ASSTech has added a new simple-to-mount horizontal design of float switch to its Jumo range.

Multi-application radar level transmitters
Instrotech Level Measurement & Control
Instrotech now offers Kobold’s NGR, a robust, maintenance-free level sensor that uses TDR (time domain reflectometry) technology.

Level transmitter for hygienic applications
Emerson Automation Solutions Level Measurement & Control
The Rosemount 1408H Level Transmitter with IO-Link provides accurate, non-contacting measurement to help optimise operations and ensure food safety.

Ready for use anywhere
Endress+Hauser South Africa Level Measurement & Control
The first 2-wire loop-powered compact transmitter enters the market.

Make level sensor checks redundant
DRH Components Level Measurement & Control
The Roto-Bin-Dicator PRO is a simple paddlewheel device that monitors the level of dry bulk material.

Level switches master viscous substances
VEGA Controls SA Level Measurement & Control
VEGA has developed the new front-flush level switch, Vegapoint 24, especially for use with sticky, viscous or abrasive products.