LumaSense Technologies IGA 320/23-LO - Manual (Page 21)

IGA 320/23-LO Operating Manual Settings / parameter descriptions 21
4.9 Clear time of the maximum / minimum value storage
(tCL)
If the maximum value storage is always switched on, the highest last
temperature value will be displayed and stored. The minimum value storage
saves the lowest measurement taken during a reading. The storage has to be
cleared at regular intervals and be replaced with a new and actual value.
This feature is particularly useful when fluctuating object temperatures cause
the display or the analog outputs to change too rapidly, or the pyrometer is
not constantly viewing an object to be measured. In addition, it may also be
beneficial to periodically delete and reset the stored maximum values.
The following settings are possible:
Off: The max. value storage is switched off and only momentary values are measured.
0.01...25 s: If any clear time between 0.01 s and 25 s is set, the maximum value is estimated and
held in double storage mode. After the entered time the storage will be deleted.
extern: The external clearing can be activated and used within your own software using the
clear command “lx” (see Chapter
7 , Data format UPP). In this case, the storage operates only in
single storage because only a single deletion mechanism is used.
auto: The auto mode is used for discontinuous measuring tasks. For example, objects are
transported on a conveyer belt and pass the measuring beam of the pyrometer for only a few
seconds. In this case, the maximum value for each object has to be indicated. In this mode the
maximum value is stored until a new hot object appears in the measuring beam. The
temperature which has to be recognized as hot is defined by the low limit of the adjusted sub
range. The stored maximum value will be deleted when the temperature of the new hot object
exceeds the low limit from of the sub range by 1% or at least 2 °C. If a lower limit is not entered,
the maximum value storage will be deleted whenever the lower level of the full measuring range
has been exceeded.
Operation note: Depending upon which setting is selected, the maximum value storage will
either work in single storage mode or in double storage mode:
Single storage: The single storage mode is used when you want to reset the stored value
using your own software with the clear command “lx”. This mode allows a new value to be
established after each impulse from the reset signal.
Double storage: The double storage mode is automatically selected when entering the
reset intervals using the PC interface. This mode utilizes two memories in which the highest
measured value is held and is deleted alternately in the set time interval (clear time). The
other memory retains the maximum value throughout the next time interval. Disadvantages
of fluctuations in the display with the clock frequency are thereby eliminated.
Note: In the command structure, the maximum storage comes after the exposure
time. This results in:
clear time the adjusted response time is useless
clear times must be at least 3 times longer than the response time
only maxima with full maximum value can be recorded, which appear at
least 3 times longer than the response time.
4.9.1 max / min
When entering a reset time interval other than OFF, you will also need to determine whether to
activate the maximum “max” or the mimimum “min” storage value.
Settings:
off
0.01 s
0.05 s
1 s
5 s
25 s
extern
auto