ULM-nav-3.4
Setting the level meter up inside the measured vessel (cesspit) is also possible and we recommend it especially:
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if accurate data of individual distances are not available
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if it is necessary to measure hot media (the meter must be tempered for about 1 hour before adjusting it;
the meter is equipped with temperature compensation)
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if it is necessary to measure a rippled surface (e.g. due to a nearby infl ow)
Note:
1) Set up the level meter is possible to proceed by simpler way outside of the measured tank. For example op-
posite a wall or opposite a fl at surface (sized aprox. 1 x 1m). Level meter must be perpendiculary targeted to
the measured surface (wall). While moving the level meter please avoid jumping distance changes (control
logic in ULM presuppose smooth level movement, jumping distance can be incorrectly evaluated).
2) If you don´t succeed in the level meter´s setting, or you don´t know at which distance the level meter is sett
then fi rst set the level meter to the basic stage by turning the trimer
"20 mA"
fully to the left (approximately 15
turn anti-clockwise).
3) If the level (refl ected surface) comes to the dead zone (see the catalogue’s data) during the setting, then the
current increases to the alarm value >21mA.
This value is kept, untill the level meter doesn´t register the continuous motion of the level away from the dead
zone to the nominal measuring range (jumping distance is evaluated as a permanent fault).
If the alarm signaling continues and it is impossible to put the current back by any motion of the level, then it
is necessary to make “Reset” of the level meter (disconnection and connection of the power supply).
The level meter makes level detection again.
4) Depending on the type, the level meter is set up by default for the following ranges:
ULM-55_-02 - 0,5 m (20 mA) to 2 m (4 mA)
ULM-55_-06 - 1 m (20 mA) to 4 m (4 mA)
ULM-55_-10 - 1 m (20 mA) to 8 m (4 mA)
VI. Usage, operation and maintenance
The level meter requires no operating personnel. In the case of operation, the optional local connected display
informs operating personnel about the measured level.
The maintenance of the unit includes a check-up on the good condition of the level meter and the supply cable.
Depending on the nature of the measured substance, we recommend to inspect the cleanliness of the emitting
surface at least once per year, and clean it if necessary, if detecting any visible damage. Contact the producer or
dealer immediately.
It is forbidden to modify or tamper in any way the ULM-55 unit without the approval of the producer. Repairs may
only be carried out by the producer or a service organisation authorised by the producer.
The ULM-55 unit must be assembled, installed, put into operation, operated and maintained in accordance
with these instructions, and the provisions of valid standards concerning electrical equipment installation must
complied with the ULM-55 features.
VII. Protection, safety, compatibility and non-explosiveness
The level meter is equipped with a protection against a reversal of polarity of supply voltage and against current
overload. Safety low voltage according to the Czech State Norm CSN 33 2000-4-41 protects against dangerous
touch. Electromagnetic compatibility is ensured in accordance with the Norms EN 55022/B, EN 61326-1, EN 61000-
4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6. The non-explosiveness of the ULM-55Xi type is
certifi ed by FTZÚ-AO210 Ostrava-Radvanice, certifi cate number FTZÚ 02 ATEX 0263.
VIII. Labelling
The cap nut of the ULM-55N type contains the following information:
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Producer’s/ label and contact information
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Type of the level meter ULM-55N-_ _ (old version) or ULM-55N-_ _A (new version)
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Year of production (fi rst two digits) and serial number (remaining three digits) xx-xxx
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Supply voltage: U = 12÷30 VDC
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Range of output current I = 4÷20 mA
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Range of head working temperatures t
a
= - 30 … +70 °C (or t
a
= - 30 ... +60 °C for ULM-55N-10)
-
Protection: IP65 / IP67
- CE
labelling
-
mark of electronic device waste (bin)
