Ultrasonic level indicator SonarFox ® UST 20

Ultrasonic level indicator SonarFox ®  UST 20

Application
For continuous, non-contact level measurement in open or closed containers, tanks or silos. Suitable for liquid, mushy and pasty media. Ideal
for sludge, adhesives, resins and waste water. The device can be easily adjusted even without a medium by means of the programming display
with user-friendly menus. It also serves as a local display

Versions  
Ultrasonic level indicator SonarFox ®  UST 20-01O01 measuring range 0.15/2 m, G1B Part no.33545
Ultrasonic level indicator SonarFox ®  UST 20-11O01 measuring range 0.25/6 m, G1½B Part no.33544
Ultrasonic level indicator SonarFox ®  UST 20-21O01 measuring range 0.4/10 m, G2¼B Part no.33559
Ultrasonic level indicator SonarFox ®  UST 20-31O01 measuring range 0.5/20 m, flange DN 100 Part no.33560
Ultrasonic level indicator SonarFox ®  UST 20-01D01 measuring range 0.15/2 m, G1B, with display Part no.33543
Ultrasonic level indicator SonarFox ®  UST 20-11D01 measuring range 0.25/6 m, G1½B, with display Part no.33542
Ultrasonic level indicator SonarFox ®  UST 20-21D01 measuring range 0.4/10 m, G2¼B, with display Part no.33557
Ultrasonic level indicator SonarFox ®  UST 20-31D01 measuring range 0.5/20 m, flange DN 100, with display Part no.33558

Description
The SonarFox ®  UST 20 level indicator uses the physical properties of ultrasonic waves to determine the level. An ultrasonic wave is emitted which is reflected by objects in the sound cone. The time up to the reception of the reflected echo is a measure of the distance. Since the mounting position is defined, it is possible to calculate the filling level of the medium. Type, density and temperature of the medium have no effect onthe measurement – the only prerequisite is a reflecting surface. Acoustically diffuse surfaces such as foam or uneven surfaces of bulk solids are to be tested with regard to the application. An optional, additional alignment horn adapter can be used for such media. Installations or stirrers above the surface of the medium can be masked during empty setup.

Display
5-digit, 9 mm high, yellow Matrix OLED
Resolution 128 x 64 pixels
Measuring range
UST 20-01: 0.15/2 m
UST 20-11: 0.25/6 m
UST 20-21: 0.4/10 m
UST 20-31: 0.5/20 m
Resolution
UST 20-01: < 1 mm
UST 20-11: < 2 mm
UST 20-21: < 1 mm
UST 20-31: < 2.5 mm
Measuring accuracy
± 0.15 % FS
Temperature error
Max. 0.04 %/K
Measuring frequency
UST 20-01: 120 kHz
UST 20-11: 75 kHz
UST 20-21: 50 kHz
UST 20-31: 30 kHz
Measuring interval
0–4 s
Operating temperature range
UST 20-01: -30/+70 °C
UST 20-11: -30/+70 °C
UST 20-21: -30/+60 °C
UST 20-31: -30/+60 °C
At process connection
up to 90 °C (short-
term up to 60 minu-
tes)
Process pressure
Max. 1 bar
Process connection
UST 20-01: PP, G1B, with lock nut
UST 20-11: PP, G1½B, with lock nut
UST 20-21: PP, G2¼B, with lock nut
UST 20-31: Aluminium alloy, flange EN 1092-1 DN100
PN16
Supply voltage
DC 18 – 36 V
Output signal
4–20 mA/HART, 2-wire
Load
R Max  = 270 Ω at U = 24 V
R Max  = 180 Ω at U = 22 V
R Max  = 90 Ω at U = 20 V
R Max  = 45 Ω at U = 19 V
Current input
Max. 22 mA
Signal damping
Adjustable from 0 to 99 s
Housing
Aluminium die cast
Ultrasonic transducer
PVDF
Degree of protection
IP 67 (EN 60529)
Electrical connection
Cable gland M16 x 1.5
Weight
UST 20-01: 0.3 kg
UST 20-11: 0.4 kg
UST 20-21: 0.6 kg
UST 20-31: 3.1 kg
Options
■  Output RS-485 Modbus RTU
■  Ex version
Options
■  Output RS-485 Modbus RTU
■  Ex version