Calibration With One Reference - WIKA CTD4000 Betriebsanleitung

6. Commissioning, operation
The insert replacement tool is a curved pair of pliers that can
be hooked into the holes provided in the top of the insert. The
insert must be aligned in such a way, so that the grooves sit
directly over the controlling and monitoring thermometers.
In order to achieve the best result from the calibration, the
following points must be observed:
Diameter of the temperature probe being checked
■
The bore diameter of the insert should be larger than the
■
that of the temperature probe to be calibrated
Max. Probe diameter
temperature
600 °C 4.5 ... 8 mm
600 °C 8 ... 12 mm
600 °C 12 ... 17 mm
< 300 °C 4.5 ... 14 mm
If this is not possible, use reducing blocks with the above-
mentioned tolerances (see figure 1).
No
No
Figure 1
▶
Avoid using bores which are too accurate and do not
press the temperature probes into the block.
▶ Clean the block and the insert before use.
▶
Only insert the temperature probe or the insert into the
block at ambient temperature using the insert replacement
tool.
WIKA operating instructions, model CTD4000
The sensitive element of the temperature probe is oriented
optimally when it sits on the bottom (see figure 2).
Tolerances of
the bores
0.5 mm
0.7 mm Figure 2
1 mm
0.3 mm

6.7.4 Calibration with one reference

If the length of the temperature probe is shorter than the
depth of the bore, then the reference should also be placed
at the height of the test item.
Further preconditions for the calibration of references:
The maximum temperature of the temperature probe
■
Reducing
should be higher than the temperature of the calibrator,
block
otherwise the temperature probe could be destroyed.
Insert the test item into the insert before reaching the
■
Yes
target temperature, otherwise instabilities and sensor
break could result.
Both temperature probes must be as close to each other
■
as possible (see figure 3).
> 0.5
Yes
Reference probe
Reference probe
Figure 3
No Yes
Calibration zone
Calibration zone
EN
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