HND-T105
HND-T105 K04/1016
page 9
7.6 Some Basics of Precision Temperature Measuring
Probe Precision/Device Precision
The device is very precise (please refer to technical data). To be able to use
this high precision, the connected temperature probe has to be as precise as
possible, too. The following precision classes are available as a standard at
reasonable prices (Platinum resistor thermometers according to EN60751):
Class
Error ranges
B
± (0.3 + 0.005 • |temperature|)
1/3 B (=1/3 DIN)
± (0.1 + 0.0017 |temperature|)
1/10 B (=1/10 DIN)
± (0.03 + 0,0005 • |temperature|)
A
± (0.15 + 0.002 • |temperature|)
error of device and probe
0
1
2
3
4
-200
0
200
400
600
800
T [°C]
e
rror [
°C]
B
1/3B
1/10B
A
GMH37xx
error of device and probe
0
0,2
0,4
0,6
0,8
1
1,2
-50
0
50
100
150
T [°C]
e
rro
r [
°C]
B
1/3B
1/10B
A
GMH37xx
Error over measuring range
Error over range –50...150 °C
For applications demanding higher precision than given by this classes we
suggest to adjust the device to the used probe or to get a calibration certificate for
the device combined with the probe.
When demanding highest possible precision we suggest the usage of the
instrument HND-T205.
Attention: if an adjusted or calibrated probe is replaced, also the
adjustment or calibration certificate has to be renewed to maintain the
referring overall precision!
Be careful when buying third party temperature probes: Besides the
standard EN60751 there are some other obsolete or unusual standards on
the market. If such a probe has to be connected, the HND-T205 should be
used instead!
4-Wire-Measuring
When using resistance thermometers as the Pt100, a quite large measuring error
can be caused by inadequate cables and connections. Using 4wire measuring
avoids these kinds of errors mainly caused by unwanted resistances. It is
suggested to use suitable probes and extensions only. (For pin assignment
please refer to chapter 7.9 Probe pin assignment)
HND-T
HND-T
