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WIKA operating instructions, model CTD4000
14366831.01 05/2020 EN/DE
EN
10. Maintenance, cleaning and recalibration
10.3.1 Calibration of the internal probe by the user
By calibrating yourself, the parameters of the
internal reference probe are re-determined or
adjusted. The accuracy is thus dependent upon
the reference used.
WIKA can thus no longer guarantee the
accuracies specified in the specifications.
As soon as these changes are carried out, the
current calibration certificate (if it was delivered
with it) loses its validity.
Calibration can be carried out directly on the keyboard of the
instrument. The calibration is done by adjusting the internal
probe at one or more points of the range using a standard
thermometer.
The calibration is possible only by setting the temperature
unit to
“°C”
.
The purpose of recalibration is to correct the error between
the temperature indicated and the value of a standard
thermometer.
To calibrate the internal probe, it is necessary to have a
standard thermometer with a precision greater than the
calibrator to follow the instructions below.
1. Insert the standard thermometer probe in the most
suitable hole of the calibrator.
2. Depending on the measuring range of the instrument
or the external area in which the calibration should be
carried out, define a minimum of 5 calibration points or
several calibration points (max. 10 points).
3. Set the first calibration point and wait for the calibrator to
be stable (see the stability LED).
4. Enter menu level 3 (see 7.3.4 “Third menu level -
Recalibration of the instrument”) and select PC.
5. With the
[▲]
or
[▼]
button, set the value read with the
standard thermometer
6. Confirm the entry with the
[E]
button.
⇒
Confirmation is indicated by a beep.
7. Repeat the steps 3 ... 6 for the other points.
8. At the end of the operation, wait for approx. 20 seconds to
come back to the main menu.
At the end of the calibration
DO NOT
remove the standard
thermometer if the calibrator is still at high temperature. First,
cool the calibrator while the probes are still inserted, see
chapter 6.9 “Cooling down the metal block”.
Model
Possible calibration points
CTD4000-140
-15, 0, +50, +100 and +125 °C
[5, 32, 122, 212 and 257 °F]
CTD4000-375
50, 120, 190, 260 and 340 °C
[122, 248, 374, 500 and 644 °F]
CTD4000-650
100, 200, 300, 400, 500 and 600 °C
[212, 392, 572, 752, 932 and 1,112°F]
