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Ultrasonic Level Meters - ULM-70

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• Quick view measured values on the display
• Easy adjustment without measured material
• Elimination of false echoes
• Zone temperature compensation
• Outstanding contrast OLED display
• Advanced intelligent signal processing
• Mapping of false reflections
• Current output (4 ... 20 mA), HART®, RS-485 Modbus/RTU
• Xi version for usage in explosive areas

Model Number: ULM-70
Data Sheet:

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Product Specification

ULM-70 Ultrasonic Level Meters Description

The ULM ultrasonic level meters are compact measurement devices including an electroacoustics converter, central processor unit and display module. Using the electroacoustics converter, the level meters transmit the sequence of ultrasonic pulses that spread towards the surface level. The converter recuperates reflected acoustic waves that are subsequently processed in the electronic module. The intelligent evaluation block filters out interfering signals, compares the cleaned received signal with the false reflection map (e.g. from mixers, ladders, reinforcement etc.) and selects a suitable reflection (echo). Based on the period during which the individual pulses spread towards the surface level and back and based on the measured temperature in the tank, the instant distance to the surface level is calculated. According to the level height, the level meter output is set: current 4 -20 mA with HART® protocol or output RS-485 Modbus and the measured value is displayed on the display.

The level meters are suited to level measurement of various liquid materials, sewerage waters, mash and paste materials, suspensions in closed or open vessels, sumps, reservoirs and open channels. In case the level of bulk solids is measured, the measurement range is reduced. We recommend to consult the use with the manufacturer.

ULM-70 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, drains, etc.
• Quick view measured values on the display
• Easy adjustment without measured material
• Elimination of false echoes
• Zone temperature compensation
• Possibility of using in explosive areas (version Xi)
• Current output (4 ... 20 mA) with HART® protocol or output RS-485 Modbus
• Copying of level meter configuration using display module DM-70
• While used with horn adapter can be measured also some difficult media (foamy levels, bulk solids, etc.)

Variants of sensors

ULM-70_-02	Measuring range from 0,15 m do 2 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 1".
ULM-70_-06	Measuring range from 0,25 m do 6 m, plastic PVDF transmitter and plastic body (PP+HDPE), process connection with thread G 1 ½".
ULM-70_-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-70_-20	Measuring range from 0.5 m to 20 m, with plastic PVDF transmitter and plastic body (PP+HDPE), aluminium alloy flange.

ULM-70 Ultrasonic Level Meters Dimensional drawings

ULM-70 Ultrasonic Level Meters Technical specifications – Level meter

Measuring range ¹⁾	ULM-70_-02 ULM-70_-06 ULM-70_-10 ULM-70_-20	0.15 ... 2 m 0.25 ... 6 m 0.4 ... 10 m 0.5 ... 20 m
Adjustable measuring range (SPAN)		Min. 200 mm
Supply voltage	ULM-70_- _ _ ULM-70Xi-_ _	18 ... 36 V DC 18 ... 30 V DC
Output	ULM-70_-_ _-_-I ULM-70_-_ _-_-M	4 ... 20 mA (Limit values 3.9 ... 20.5 mA), HART^® RS-485 with protocol Modbus RTU
Current consumptio	ULM-70_-_ _-_-I ULM-70_-_ _-_-M	4 ... 20 mA / Max. 22 mA Max. 20 mA
Resolution	ULM-70_-02 ; 06 ULM-70_-10 ULM-70_-20	< 1 mm < 2 mm < 2,5 mm
Accuracy (within the total range)		0,15 %
Temperature error		Max. 0,04% / K
Operating frequency	ULM-70_-02 ULM-70_-06 ULM-70_-10 ULM-70_-20	120 kHz 75 kHz 50 kHz 30 kHz
Beamwidth (-3 dB)	ULM-70_-02 ; 10 ULM-70_-06 ULM-70_-20	10° 14° 12°
Ambient temperature range	ULM-70_-02 ; 06 ULM-70_-10 ; 20	-30 ... +70°C -30 ... +60°C
Short-time temperature stress resistance		+90°C / 1 hod.
Max. operation overpressure (on transmission surface)		0,1 MPa
Sensitivity		3 stupně (low – medium – high)
Damping		0 ... 99 s
Measuring period		1 ... 4 s
Rise time
Additional technical data for Ex proof – Max. internal values		U_i=30V DC; I_i=132mA; P_i=0,99W; C_i=370nF; L_i=0,9mH
Failure indication (echo loss, level in dead zone ³⁾ , internal failure)		Adjustable in modes: 3.75 mA ; 22 mA ; Last measured value
Protection class		IP67
Mechanical connection	ULM-70_-02 ULM-70_-06 ULM-70_-10 ULM-70_-20	Screwing with thread G 1'' Screwing with thread G 1½'' Screwing with thread G 2¼'' Aluminium alloy flange
Recommended cable	ULM-70_-_ _-_-I ULM-70_-_ _-_-M	PVC 2 x 0,75 mm² PVC 2 x 2 x 0,25 mm² ( twisted pair, shielded)
Maximal resistance of current output load	U = 24 V DC U = 22 V DC U = 20 V DC	R max = 270 Ω ²⁾ R max = 180 Ω R max = 90 Ω
Weight	ULM-70_-02 ULM-70_-06 ULM-70_-10 ULM-70_-20	0.3 kg 0.4 kg 0.7 kg 3.1 kg

1) In case the level of bulk-solid materials is measured, the measurement range is reduced.
2) Including 250R resistor in case of HART connection

ULM-70 Ultrasonic Level Meters Technical specifications – Display module

Display type	Matrix OLED
Resolution	128 x 64 pixel
Character height / Number of digits measured value	9 mm / 5 Digits
Display colour	Yellow
Buttons	Membrane switch panel
Ambient temperature range	-30 ... +70 °C
Weight	46 g