LumaSense Technologies IS 12-S - Manual (Page 26)

IS 12 / IGA 12 Manual Settings / parameter descriptions 26
5.3 Clear time of the maximum / minimum value storage
(t
CL
)
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 maximum value storage value has two different operating modes:
Single Storage: The single storage is used when you want to reset the stored value using
an external impulse via one contact closure from an external relay (i.e. between two
measured objects). The relay contact is connected directly to the pyrometer between pins J
and K. This mode allows a new value to be established, after each impulse from the reset
signal.
Double Storage: When entering the reset intervals via push buttons or PC interface the
double storage mode is automatically selected. This mode utilizes two memories in which
the highest measured value is held and is deleted alternately in the time interval set (clear
time). The other memory retains the maximum value throughout the next time interval.
The disadvantages of fluctuations in the display with the clock frequency are thereby
eliminated.
The following settings are possible:
Off: Clear time “0.00“: the storage is switched off and only momentary values are measured.
0.01…25 s: If any clear time 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 of the storage can be activated and used within an own software
(see Chapter 9 Data format UPP (Universal Pyrometer Protocol)) or via an external contact (for
connection see 3.1.1 Pin assignment for the connector on the back of the pyrometer). 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 only for a few
seconds. Here the maximum value for each object has to be indicated. In this mode the
maximum value is stored until a new hot (or cold) 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.
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.
Settings:
0.00 s
0.01 s
...
25 s
extern
auto