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Ultrasonic Level Meters - ULM-53

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• Resolution: < 1 mm
• Max. operation overpressure: 0,1 MPa
• Protection class: IP67
• For continuous non-contact level measurement
• State indication by two LEDs
• Current output (4 ... 20 mA), voltage output (0 ... 10 V) or RS-485 Modbus output
• Easy and quick connecting by connector
• Xi version for usage in explosive areas

Model Number: ULM-53
Data Sheet:

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Product Specification

ULM-53 Ultrasonic Level Meters Description
The ULM ultrasonic level meters are compact measurement devices containing an ultrasonic transmitter and an electronic module. Using an transmitter, level meters transmit the series of ultrasonic pulses that spread towards the level surface. The transmitter recuperates reflected acoustic waves that are subsequently processed in the electronic module. Based on the period during which the individual pulses spread towards the level and back, this period is averaged by the electronics that performs temperature compensation and subsequently a conversion to an output current 4 -20 mA, voltage 0 - 10 V or output RS-485 Modbus.

The ULM ultrasonic level meters are suitable for continuous non-contact level measurement of liquids (water solutions, sewerage water, etc.), mash and paste materials (sediments, sticks, resins etc.) in closed or open vessels, sumps, reservoirs and open channels. In case the level of bulk-solid materials is measured, the measurement range is reduced.

All setting-up is done using two buttons positioned in the upper part of the sensor. The level meter is equipped with optical state indication (STATE) and with a setting-up process (MENU). The level meter can output current or voltage signals. They are manufactured in model versions for non-explosive areas (N) and explosive areas (Xi).

ULM-53 Ultrasonic Level Meters FEATURES
• For continuous level measurement of liquids (even if polluted), mash and paste materials in open or closed vessels, sumps, open channels, etc.
• Variants of level meter with adjustment by two buttons, or by magnetic pen
• Xi version for usage in explosive areas
• State indication by two LEDs
• Current output (4 ... 20 mA), voltage output (0 ... 10 V) or RS-485 Modbus output
• Wide choice of electric connection via connectors, cable glands or protective conductor
• While used with horn adapter can be measured also some difficult media (foamy levels, loose materials, etc.)

ULM-53 Ultrasonic Level Meters Features of variants

ULM-53_-01-_	Measuring range from 0.1 m to 1 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G ¾ ".
ULM-53_-02-_	Measuring range from 0.2 m to 2 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 1".
ULM-53_-06-_	Measuring range from 0.2 m to 6 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 1 ½".
ULM-53_-10-_	Measuring range from 0.4 m to 10 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 2 ¼ ".
ULM-53_-20-_	Measuring range from 0.5 m to 20 m, with plastic PVDF transmitter and plastic body (PP+HDPE), aluminium alloy flange.

ULM-53 Ultrasonic Level Meters Dimensional Drawings

ULM-53 Ultrasonic Level Meters Technical specifications

Measuring range ¹⁾	ULM-53_-01-_ ULM-53_-02-_ ULM-53_-06-_ ULM-53_-10-_ ULM-53_-20-_	0.1 ... 1 m 0.2 ... 2 m 0.2 ... 6 m 0.4 ... 10 m 0.5 ... 20 m
Supply voltage	ULM-53N-_ _-_ ULM-53Xi-_ _-I	18 ... 36 V DC 18 ... 30 V DC
Current supply	ULM-53N(Xi)-_ _ -I ULM-53N-_ _ -U ULM-53N-_ _ -M	4 ... 20 mA / max. 22 mA Max. 12 mA Max. 20 mA
Current output ULM-53_-_ _-I Voltage output ULM-53N-_ _-U Modbus output ULM-53N-_ _-M		4 ... 20 mA (limit values 3.9 ... 20.5 mA) 0 ... 10 V (limit values 0 ... 10.2 V) Modbus RTU protocol
Resolution		< 1 mm
Accuracy (within the total range)	ULM-53_-01 in area 0,1-0,2 m / 0,2-1,0 m ULM-53_-02; -06 ULM-53_-10; -20	0,3 % / 0,2 % 0,15 % 0,2 %
Temperature error		Max. 0,04 %/K
Beamwidth (-3 dB)	ULM-53_-01-_ ; 02-_ ; 10-_ ULM-53_-06-_ ULM-53_-20-_	10° 14° 12°
Ambient temperature range	ULM-53_-01-_ ; 02-_ ; 06-_ ULM-53_-10-_ ; 20-_	-30 ... +70°C -30 ... +60°C
Measuring periond	ULM-53_-01-_; 02-_ ULM-53_-06-_; 10-_ ULM-53_-20-_ ULM-53_-_ _-M	0,5 s 1,2 s 5,0 s adjustable via Modbus RTU
Averaging (can be modified according to agreement)	ULM-53_-_ _-_ ULM-53_-_ _-M	4 measurement adjustable via Modbus RTU
Short time temperature stress resistance		+90°C / 1 hod.
Max. operation overpressure (on transmission surface)		0,1 MPa
Max. internal values ²⁾ (for the Xi version only)		U_i=30 V DC; I_i=132 mA; P_i=0,99 W; C_i=370 nF; L_i=0,9 mH
Failure indication	echo failure – basic mode echo failure – inverse mode level in dead zone – basic mode level in dead zone – inverse mode	3,75 mA (0 V) 22 mA (10,5 V) 22 mA (10,5 V) 3,75 mA (0 V)
Protection class		IP67
Recommended cable		PVC 2 x 0,75 mm² (3 x 0,5 mm²)
Maximal current output load resistance	at U = 24 V DC at U = 22 V DC at U = 20 V DC	Rmax = 270 Ω Rmax =180 Ω Rmax = 90 Ω
Minimal voltage output load resistance		Rmin > 1 kΩ
Delay between supply power rise time and first measurement	ULM-53_-01-_; 02-_ ; 06-_ ULM-53_-10-_; 20-_	5 s 9 s
Process connection	ULM-53_-01-_ ULM-53_-02-_ ULM-53_-06-_ ULM-53_-10-_ ULM-53_-20-_	thread G ¾‘‘ thread G 1‘‘ thread G 1½‘‘ thread G 2¼‘‘ aluminium alloy flange
Weight	ULM-53_-01-_ ULM-53_-02-_ ULM-53_-06-_ ULM-53_-10-_ ULM-53_-20-_	0,20 kg 0,20 kg 0,25 kg 0,65 kg 2,80 kg

1) In case the level of bulk-solid materials is measured, the measurement range is reduced.
2) Allowed pressure range in the zone 0: 80 ... 110 kPa.

ULM-53 Ultrasonic Level Meters Order code