WIKA CTM9100-150 - Handbuch (Seite 21)

21 WIKA operating instructions, models CTD9100, CTB9100, CTM9100
11263911.02 05/2014 GB/D
GB
6. Commissioning, operation
6.6 Testing of temperature sensors
To test temperature sensors, connect a separate tempera-
ture-measuring instrument to the test item. By comparing the
temperature displayed on the external measuring instrument
with the reference temperature, there is evidence of the
status of the test item. This ensured that the test item requires
a short time until it reaches the temperature of the metal
block or liquid bath.
WARNING!
There is no possibility for calibrating earthed
thermocouples, since the heating block is
earthed and this would therefore lead to
false measurement results.
6.7 Start-up procedure
If the calibrator is not used for a long time, because of the
materials used (magnesium oxide), moisture can penetrate
the heating elements.
Following transport or storage of the calibrator in moist
environments, the heating elements must be taken to higher
temperatures slowly.
During the drying process,it should be assumed that the
calibrator has not yet reached the required insulation voltage
for protection class I. The start-up set point is T
anf = 120 °C
with a holding time of T n = 15 min.
6.8 Switching on the calibrator/micro calibration bath
1. Connect to the mains using the mains connector supplied.
2. Switch on the mains switch.
The controller will be initialised.
The upper PV display will show tEst.
In the lower SV display, the version number (e.g. rL 2.2) will
be shown.
After approx. 5 secs, the initialisation will be complete and
the calibration mode will automatically be displayed.
The built-in heating or cooling elements will temper the metal
block automatically from room temperature to the controller’s
set temperature.
6.9 Reference and set temperature display
Upper PV display:
The red 4-digit, 7-segment display shows the current temper-
ature of the metal block or liquid bath.
Lower SV display:
The green, 4-digit, 7-segment display shows the current set
temperature of the metal block or the liquid bath.
Once the set temperature has been reached, through short
switch impulses, the radiated heating energy from the metal
block or liquid bath is delivered, so that the temperature
within remains constant.
Reference and set temperature display
6.10 Control of the reference temperature
The red LED OUT 1 indicates that the heater is turned on.
During the heating phase a steady light indicates that heating
energy is being supplied. A flashing LED indicates that the
reference temperature (set temperature) has almost been
reached and therefore the heating energy is only being
supplied in short bursts.
Display with LED OUT 1
To ensure good temperature stability, the cycle time of the
controller is set low and the control output is usually raised.
Control achieved via PID algorithm