WIKA CTM9100-150 - Handbuch (Seite 23)

23 WIKA operating instructions, models CTD9100, CTB9100, CTM9100
11263911.02 05/2014 GB/D
GB
7. Operating elements of the calibrator/micro calibration bath
Temporary set temperature setting
Display in HEATING calibration mode
Display in FAN or COOLING calibration mode
The calibration of surface thermometers is very difficult
and not fully defined. Thermometers mounted on surfaces
dissipate heat from the surface and create a cold zone on
the surface being measured. In the multi-function calibrator,
the calibration temperature is created in a specially designed
surface insert and an external reference thermometer
measures the temperature directly under the surface. The
reference thermometer also determines the temperature of
the cold zone through integration of the temperature along
the sensitive length of the reference thermometer and thus
provides a true temperature calibration of surface tempera-
ture sensors.
The sleeve is designed so that the supplied external refer-
ence provides the best possible result, since the depth of the
bore is adjusted to the sensitive length. If a separate external
reference is used for comparison calibration, ensure that
the sensitive length is known and it lies in the centre of the
calibration surface.
7.2 Calibration (calibration mode)
As soon as the calibrator or micro calibration bath is switched
on, following the initialisation, it defaults to calibration mode.
On the upper PV display, the current reference temperature
is indicated.
On the lower SV display is the set temperature.
The LED OUT 1 signals the status of the outputs for the
heating control:
■ If the LED OUT 1 is on, the temperature will increase.
■ If the LED OUT 1 is not on, the heating is switched off.
a) Heating instrument
The LED OUT 2 signals the status of the outputs for the fan
control:
■ If LED OUT 2 is on, the fan is running at higher speed.
■ If LED OUT 2 is not on, the fan is running at lower speed.
b) Heating and cooling instrument
The LED OUT 2 signals the status of the outputs for the
cooling control:
■ If the LED OUT 2 is on, the temperature will decrease.
■ If the LED OUT 2 is not on, the cooling is switched off.
Two possibilities for setting the set temperature
Either a temporary set temperature is set (see chapter 7.3)
or a fixed set temperature (see chapter 7.4) is stored in the
main menu.
7.3 Setting a temporary set temperature (set-point
mode)
In this operating state, a stored set temperature is temporarily
changed.
1. Press key P briefly.
On the upper PV display, the currently aktive set value
memory is displayed, e.g. SP2 (set point 2).
On the lower SV display is the corresponding set tempera-
ture.
2. By pressing button 5 the set temperature is increased.
By pressing button 6 the set temperature is reduced.
3. By pressing button P again, the new set point is accepted.
The LED OUT 2 signals the status of the outputs for the fan/
cooling control.
By pressing button 5 or 6 the value is
increased or decreased by 0.01 °C. If the
keys are held down for at least 1 sec.,
however, the value increases or decreases
more rapidly, and after 2 secs. even faster,
so that the desired value can be reached
very quickly.
If, in set-point mode, no button has been
pressed for approx. 15 secs., an automatic
return to calibration mode occurs.