Test Function; Factory Settings; Parameter Descriptions / Settings; Emissivity (Emi) = 100 - LumaSense Technologies mpac IN 140/5-L Betriebsanleitung

IMPAC pyrometers IN 140/5 · IN 140/5-H · IN 140/5-L
8.4

Test function

The diagnostic push button „test" generates a current on
the analog output which is used to check if a connected
external indicator shows the correct temperature value.
The test current output is centered to the chosen analog
output span, consequently 10 mA is supplied if the analog
output is adjusted to 0 to 20 mA and 12 mA is supplied if
the analog output span is set from 4 to 20 mA. The LC
display indicates the respective current along with the
corresponding temperature. For example if a measuring
range of 250°C to 14000 °C is selected the temperature
shown in the display is 825.0°C). This temperature must
be reflected exactly by the indicator which is supplied by the respective current. If this is not the case the
selected analog input current span of the indicator is not equivalent to the chosen current output span of the
pyrometer and one of the current spans or temperature range have to be modified. By pressing the „test"
push button once again or by pressing any push button of the LC-display the test current is switched off. Also
after 30 seconds idle time the "test" current is switched off. The unit will be in the measurement mode again.
8.5

Factory settings

Emissivity (Emi) = 100%;

Exposure time (t90) = min;
Clear time (tClear) = off;
Analog output (mA) = 0 ... 20 mA;
Sub range (from / to) same as temperature range
9

Parameter descriptions / settings

9.1 Emissivity (Emi)
The emission coefficient (emissivity) is the relationship of the emission output of
an object to the emission output of a "black body radiation source" (this is an ob-
ject which absorbs all incoming rays, Emi = 100%) at the same temperature. Dif-
ferent materials have different emissivities ranging between 0% and 100% (set-
ting at the pyrometer is 10 ... 100%, an additional attenuation, setting from 100 to
120% can be used for example to correct the measurement of objects behind
gases with hot soot. The set value is shown at the display). Materials that reflect
or transmit (transparent materials) more radiation have a lower emissivity and the
emissivity setting of the pyrometer needs to be adjusted accordingly.
Emissivity values of glass or quartz glass is the following:
Object
Glass / Quartz glass
9.2

Exposure time (t90)

The exposure time is the time interval when the measured temperature has to be pre-
sent after an abrupt change so that the output value of the pyrometer reaches a given
measurement value. The time taken is to reach 90 % of the recorded temperature dif-
ference. In the "min" position, the device operates using its time constant of 40 ms.
Longer exposure times can be used for the measurement of objects which have rapidly
fluctuating temperatures to achieve constant temperature reading.
14
Emissivity (at 5.14 µm)
0.97
Test function active
(here the analog output
is set to 0 to 20 mA)
Display which also has
to be on an external
indication instrument
(here temp. range
250 to 1400°C)
Address (Adr) = 00;
Baud rate (Baud) = 19200 Bd;
Temperature display (C / F) = °C
Wait time (tw) (for RS485) = 10;
Interface (RS485 / RS232) = RS232
Display
of the
adjusted
emissivity
Settings:
min
0.01 s
0.05 s
. .
.
10.00 s