IKA HBC 10 baisc - Manual (Page 32)

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• External and internal temperature control (ET)
ET 0: internal temperature control
ET 1: external temperature control
If the external temperature control (ET 1) is selected,
the following items EuT 2 (sampling time), Kp 2, Ti 2,
Td 2, Df t (maximum temperature difference between
internal and external temperature) and FAST could be
set. Otherwise they are not displayed in the menu list.
The sampling time EuT 2 (s) is the interval over which
the external control deviation and the respective con-
trol variable (dependent on Kp 2, Ti 2, Td 2, Df t and
FAST) is determined.
EuT 2 must be adjusted to match the response charac-
teristic (total of all time constants) of the external closed
loop controlled system, so that the control variable can
deliver a uniform and measurable change in the control
deviation. EuT 2 values that are too small or too large
can lead to instability of the controller.
Dynamics of the external PID temperature control (FAST)
FAST=0: accurate, without overshoot
FAST=1: fast, with overshoot
• Alarm and key tone (BEEP)
BEEP 0: no alarm and key tone
BEEP 1: alarm and key tone is activated
• Calibration and adjustment (CALI)
CALI 0: no calibration
CALI 2: 2-point calibration
CALI 3: 3-points calibration
Example: 2-point calibration:
Dip the temperature sensor of the reference measuring
instrument into the bath fluid:
- If ET 0: into the internal bath (open the lid (16))
- If ET 1: at the same position as the external Pt100
temperature sensor (12).
Set the first point temperature (e.g. 80 °C). Confirm the
setting by pressing the right knob (C).
Left area of the display appears the set value (80 °C) and
the right area of the display appears the actual tempera-
ture value measured. The set LED (K) flashes briefly.
The unit now starts and controls to the set value. When
the temperature has reached the set value and has be-
come constant, the “Set” LED (K) no longer flashes and
the following display appears.
The temperature measured by the unit appears on the
left hand side.
Input the calibration value from the reference mesuring
instrument (e.g. 80.2 °C) with the right knob (C).
Confirm the value by pressing the right knob (C).
Back to previous screen for input a new value by press-
ing the left knob (B).
Back OK
The first point calibration is finished now.
Calibration of the other points is performed in the same
way.
If ET 0: adjustment of the internal temperature mea-
surement.
If ET 1: adjustment of the external temperature mea-
surement.
Select 2-point calibration in the menu. Press the right
knob (C) to start the 2-point calibration.