Ultrasonic Level transmitter for liquids and solids
April 2000
Level Measurement & Control
Protea Industrial Controls
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.
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