IS 140 • IGA 140 Manual
Software InfraWin
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24
5.3 Response Time/Exposure Time (t
90
)
Exposure time is the amount of time that the measured temperature has to
be present after an abrupt change before the output value of the pyrometer
is updated. The time it takes to reach 90% of the recorded temperature
difference is the response time. In the “min” position, the device operates
using its time constant.
5.4 Clear Time of the Maximum/Minimum Value
Storage (t
CL
)
If maximum value storage is on, the highest last temperature value will
always be displayed and stored. Minimum value storage saves the lowest
measurement taken during a reading. The storage has to be cleared at
regular intervals for exchanging by 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:
Maximum value storage is deactivated and only immediate 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:
External clearing can be activated and used with other software and the
clear command “lx” (see Chapter 9, Data format UPP) or via an external
contact (see section 3.1.1). 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 under the measuring
beam of the pyrometer for only 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 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.
Hold:
The function “hold” enables to freeze the current temperature reading at
any moment. For this an external push button or switch has to be
connected (see 3.1.1 for connector pin J) which holds the temperature
reading as long as the contacts are closed.
Operation note:
Depending on the settings, the maximum value storage either works in
single
storage
mode or in
double storage
mode:
Single storage:
Single storage is used when you want to reset the stored value using
other software and the clear (“lx”) command. This mode allows a new
value to be established after each impulse from the reset signal.
Settings:
min
0.01 s
0.05 s
...
10.00 s
Settings:
off
0.01 s
...
25 s
extern
auto
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