LumaSense Technologies IN 520 - Manual (Page 22)

Series IN 500 Operating Manual Device Settings 22
4.1.2 Response time (T
90
)
The response time t
90
is the time interval for the analog output of the pyrometer to
go from a low temperature value up to 90% of the temperature step to a high value
when measuring an abrupt increase from said low to said high temperature. The
time is taken to reach 90% of the recorded temperature difference. In the OFF
position, the device operates using this time constant (shortest response time).
Longer response times can be used for the measurement of objects which have rapidly
fluctuating temperatures to achieve constant temperature reading.
4.1.3 Clear time (T
CL
)
The maximum value storage (or minimum value storage) stores the highest (or
lowest) measurement value. The clear time defines the time period until the stored
value is deleted and replaced by a new one.
The following settings are possible:
When set to OFF, the maximum value storage is switched off and all new
temperature values are measured but not stored.
If any clear time between 0.01 s and 25 s is set, the maximum value is estimated and held
in storage mode. After the entered time, the storage will be deleted.
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 (minimum) value for each object has to be indicated.
In this mode, the maximum (minimum) value is stored until a new hot (or cold) object
appears in the measuring beam. The temperature which has to be recognized as “hot“
(or “cold“) is defined by the low (high) 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 LO of the sub range by 1% or at least 2 °C. The stored minimum value will
be deleted when the object temperature falls below the high limit HI of the sub range
by 1% or at least 2 °C.
The external clearing (“extern”) of the storage can only be activated and used with an
own software (see data format UPP , section 7).
4.1.4 Selection of the maximum or minimum value storage (MAX or
MIN)
With this setting you choose between maximum or minimum value storage if the
storage function is activated by setting TCL. If TCL is switched “OFF”, the storage
function is not activated, the indication of “MAX“ or “MIN“ only shows the
preselection.
4.1.5 Subrange (LO / HI)
You have the opportunity to choose a subrange (minimum 51 °C) within the basic
measuring range of the pyrometer. This subrange corresponds to the analog
output. LO describes the beginning of this measuring range, HI the end of the
range. If the thermocouple output is used, the analog output does not change. In
addition, by setting a subrange, it is possible to fulfill the requirements of the “auto” clear
mode of the maximum or minimum value storage (see above).
Settings:
OFF
0.5 s
...
30 s
Settings:
OFF
0.1 s
...
25 s
extern
auto
Settings:
MAX
MIN
Settings:
700 °C
...
-40 °C