Lumasense-technologies IN 6/78-L Manuel d'utilisateur télécharger pdf (Page 20)

IN 6/78-L Operating Manual Settings / parameter descriptions · 20

reflected. For bright, smooth surfaces, such as mirrors, the reflected radiation is more focused;

on rough, harsh surfaces it is diffuse. The rate of diffuse reflection is, in this case (100% - e).

If the measured object’s temperature is the same as the ambient temperature (this is most often

the case), you only need to set the emissivity on the pyrometer (when using the InfraWin

program the off-set compensation for the ambient temperature must be in “auto“. If the object

to be measured is in an oven, where the temperature is higher than the ambient temperature, a

portion of the radiation, corresponding to the rate of diffuse reflection, will be “reflected“ by

the measured object to the pyrometer, resulting in an inaccurate reading (the reading will be

too high due to the oven temperature).

In this case, it makes sense to activate the off-set compensation for the ambient temperature (in

the parameter window of the InfraWin program: Compensating for the off-set of the ambient

temperature switched to “man.“ (= manual) and then enter the ambient temperature value (in

this case, the oven temperature) in the corresponding field. The program also makes a

compensation calculation in order to display the correct temperature.

Be aware that the accuracy of such a correction is highly dependent on accuracy of the emissivity

value that was set. The off-set compensation for the ambient temperature uses the rate of

diffuse reflection when performing its calculation. If you alter the emissivity (e), you are also

altering the rate of diffuse reflection (100% – e) and in turn, the displayed temperature. The

following observation shows how a faulty emissivity reading in conjunction with the

compensation for the ambient temperature affects results:

Entry of e = 91% instead of 92% indicates:

A relative change in emissivity of 1.1 %.

Likewise the assumed rate of reflection changes from 8 % to 9 %.

This results in a relative increase in reflection of 12.5 %.

This change also impacts the displayed result, thereby causing a fairly inaccurate compensation

calculation. For hot environments, this calculation will probably serve as a much more accurate

assessment than the standard calculation, which assumes that the ambient temperature is the

same as that of the object measured.

4.10 Wait time t

Using a pyrometer with RS485 it is possible that the connection is not fast

enough to receive the pyrometer’s answer to an instruction of the master. In

this case a wait time can be set to slow down the data transfer (e.g.: t

= 02

at a baud rate 9600 means await time of 2/9600 sec).

Note: The pyrometer enters a waiting period after certain commands and may not

respond right away because some commands have an internal processing time of up

to 3 ms.

4.11 Internal Temperature of the Pyrometer

The internal temperature of the pyrometer can be read via interface. It is a few degrees above

the ambient temperature due to the heat generated by the pyrometer electronics.

Settings:

00 Bit

99 Bit

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 37 38

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