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:

Continuous non-contact level measurement with radar technology
KROHNE Level Measurement & Control
Online teaser: A narrow beam angle of 4° for tank internals and long nozzles is combined with accuracy down to ±2 mm, even in processes with fast-changing levels and low dielectrics.

Plumb bob sensor for tanks and settling basins
Morton Controls Level Measurement & Control
Its precise sensitivity can be adjusted to slurries and solids in liquids, and can also be configured for use in corrosive media with increased resistance.

Level measurement – now with Bluetooth
WIKA Instruments Level Measurement & Control
The instrument’s description, TAG number, and 0% and 100% marks can be configured via an app on a smartphone or tablet.

Radar sensor keeps its cool
VEGA Controls SA Level Measurement & Control
The VEGAPULS C 21 delivers exact measuring results without effect from the medium, or the process and ambient conditions

Load sensor for force measurement
Instrotech Level Measurement & Control Mass Measurement
The instrument provides a solution for non-intrusive level measurements of materials that are subject to uneven build-up, bridging or sidewall collection.

Diesel level sensing for rail engines
Instrotech Level Measurement & Control
Diesel fuel levels are measured, recorded and displayed, and kilowatt-hours are measured, using the Senix ToughSonic CHEM 10 ultrasonic sensor.

Radar level sensor with IO-Link interface
ifm - South Africa Level Measurement & Control
Its non-contact radar measuring principle prevents malfunctions or failures of the sensor caused by the adhesion of viscous media or damage from agitators.

Why are rate of change alarms used?
Omniflex Remote Monitoring Specialists Level Measurement & Control
Often the domain of control and safety software, rate of change alarms can be implemented in hardware to benefit from an additional layer of protection to systems or processes.

Vibronics, Liquiphants, and human brainpower set free
Endress+Hauser South Africa Level Measurement & Control
Why are field device manufacturers continually developing new technologies? On the one hand, these technologies make work outside in the field easier. Fewer qualified personnel are needed and the technologies ...

“Oops! I forgot to check” – How a simple switch can prevent critical system failure
Hydrasales Level Measurement & Control
Daily checks of hydraulic systems, or checks at the time of employee shift changes, are good practices that should be part of a successful maintenance programme.