User manual

10 Operating manual – temperature measuring device XP100 / XP101 EN
11_2014
Settings 3/3:
36
37
38
A.
39
B.
C.
D.
36 Configures the duty factor at the sensor:
normal duty factor 50 %
sqrt(2) duty factor 33 %
Changing the duty factor enables the determination of the
sensor's self-heating. This measuring method can be used for
high-precision measurements at fixed points, such as the
water triple point, and in suitable media ensuring a high
temperature stability.
The selected setting is displayed on the screen if it differs from the setting
Normal.
37 Here, the linearisation function can be selected. The following options are
available:
IEC 60751 default setting for PT100
ITS-90 for spectrally pure platinum resistance thermometers
XP101
Only available for the XP101. Contains stored characteristic
curve for the supplied sensor
Note!
Before using the measuring device, make sure that you are aware of the
device's intended purpose and the respective standard in effect as well as
the contents of this standard.
38 Here, different coefficients can be selected and entered by hand. Once
you changed the coefficient, *U is displayed behind the selected
linearisation function in the measuring mode.
The coefficient selection options depend on the selected linearisation
function. Indicated below are the editable coefficients with their default
values:
IEC 60751
R
0
= 100 
A = +3.9083*10
-3
°C
-1
B = -5.7750*10
-7
°C
-2
C = -4.1830*10
-12
°C
-3
ITS-90 For explanations regarding ITS-90 see below.
XP101 The coefficients for this function cannot be edited.
Note!
Incorrect coefficients can lead to large measurement deviations!
Change the value for a coefficient as follows:
1. Click on the Coefficients button.
2. Press the button with the desired coefficient (see fig. B. for IEC 60751
or fig. C. for ITS-90).
3. Enter the desired value by use of the buttons (example fig. D.)
4. Confirm the entry by pressing OK.
5. To reset a default value, press the recycle bin icon.
Note!
This function is not available if XP101 was selected as linearisation
function.
39 Offset Offset value range: -10 °C to +10 °C
Once you changed the offset, *U is displayed behind the selected
linearisation function in the measuring mode. The offset value is added to
the measured temperature value.
Note!
This function is not available if XP101 was selected as linearisation
function.