ULM–54
©
Dinel, s.r.o.
4
The ULM-54 ultrasonic level meters
are compact measurement devices including an elec-
troacoustics converter, central processor unit and display module. Using the electro acoustics
converter, the level meters transmit the sequence of ultrasonic pulses that propagate towards
the level. The converter receives 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, reinforce
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ment etc.) and selects a suitable reflection (echo). Based on the period during which the indi
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vidual pulses propagate towards the level and back and based on the measured temperature
in the tank, the instant distance to the level is calculated. According to the level height, the
level meter output is set: current 4 -20 mA with HART® protocol.
1. Basic description
2. Range of application
The level meters are suited to level measurement of various liquid materials, sewerage wa-
ters, 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 re
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duced. We recommend to consult the use with the manufacturer.
Impossible use for strongly evaporating media, organic solventy or powders.
To ensure maximum safety of control processes, we have defined the following safety instructions
and information. Each instruction is labelled with the appropriate pictogram.
Alert, warning, danger
This symbol informs you about particularly important instructions for installation and operation of
equipment or dangerous situations that may occur during the installation and operation. Not observing
these instructions may cause disturbance, damage or destruction of equipment or may cause injury.
Information
This symbol indicates particularly important characteristics of the device.
Note
This symbol indicates helpful additional information.
Used symbols
Safety
All operations described in this instruction manual have to be carried out by trained personnel
or by an accredited person only. Warranty and post warranty service must be exclusively
carried out by the manufacturer.
Improper use, installation or set-up of the sensor can lead to crashes in the application.
The manufacturer is not responsible for improper use, loss of work caused by either direct
or indirect damage, and for expenses incurred at the time of installation or during the period
of use of the level sensors.
