Calibration Of The Internal Probe By The User - WIKA CTD4000 Betriebsanleitung

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
EN
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.
Model
CTD4000-140
CTD4000-375
CTD4000-650
26
Possible calibration points
-15, 0, +50, +100 and +125 °C
50, 120, 190, 260 and 340 °C
100, 200, 300, 400, 500 and 600 °C
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".
[5, 32, 122, 212 and 257 °F]
[122, 248, 374, 500 and 644 °F]
[212, 392, 572, 752, 932 and 1,112°F]
WIKA operating instructions, model CTD4000