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5.
PUTTING INTO OPERATION, ADJUSTING, PROGRAMMING
5.1.
Putting into operation
After switching on the correctly wired unit the transducer begins to click audibly. In about 20…50 s the ECHO LED goes on and a signal between 4…20 mA
appears on the current output. When first powering the unit, it measures with the standard manufacturer’s settings (see some of the most important parameters
below).
D
EFAULT PARAMETERS
All the transducers get the same factory default parameters that can also be reset later if needed. Some of the most important parameters of the
EasyTREK SCD–300 series can be found below.
–
Measurement mode: level (LEV),
–
Zero level is assigned to the maximum measuring distance (X
M
).
–
4 mA is assigned to the X
M
maximum measuring distance (minimum level)
–
20 mA is assigned to the X
m
minimum measuring distance (maximum level)
–
Current output holds last value in case of error
–
Damping: 300 s
All the other measurement values are set to fit the values suitable for standard tasks. The functions used in special cases are switched off.
A
IMING THE SENSORS
When the material to be measured is being filled or emptied, because of the formation of an angle of repose, the vertically installed transmitter will experience a
weak signal. This can be eliminated in most cases by tilting the unit, so the aiming device is a very important part of these transmitters. The proper aiming can be
set and checked while the transmitter is being used, desirably when the silo / tank is almost empty. Usually, it is best that the transmitter points to the middle of
the bottom of the silo/tank.
In cases when the silo is narrow, and the height / diameter value equals to
or is more than 5, tilting is usually not necessary. Aiming should also be
checked when the silo / tank is full, because the echo can be adversely
weak even when coming from a nearby surface. This usually happens
when the angle of repose is big. In this case an optimal solution must be
found in which the echo coming from any distance is acceptable. The
SERVICE PARAMETERS that can be reached during programming
provide help for set-up. That means that the aiming adjustment and the
programming should be done at the same time. The strength of the
echoes can be checked in the Echo Map window of the EView software or
in the Echo menu of the MultiCONT device.
Summary of Contents for EasyTREK SCD-31 4 Series
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