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PRESYS
Instruments
6.2 - Probe Calibration
To readjust the internal Probe it is necessary to compare the value indicated by the
calibrator (Probe) and the temperature value from a standard probe placed in the dry block
insert. The temperature of the standard probe should have high accuracy.
The option to adjust the internal sensor has seven points of adjustment. These
points are recorded via points 1 to 7.
Before starting the calibration (adjustment), record in these points the respective initial
storing values, according to the table below:
Calibration
Point
Point 1: 150 °C
Point 2: 350 °C
Point 3: 600 °C
Point 4: 750 °C
Point 5: 850 °C
Point 6: 1000 °C
Point 7: 1100 °C
Select the calibration point and then press CHANGE TEMPERATURE. Wait for the
complete stabilization of the point. On the field Adjusted Point, write the value presented
in the standard thermometer and confirm in the SAVE button. Go to the next point and
continue the adjustment until the last point.
6.3 - PID Control Parameters
The TA-1200PLAB temperature calibrator has a PID control algorithm to calculate
the block control output.
The dry block stability and response time features are related to the PID
parameters, explained below:
The K parameter (proportional gain) amplifies the error signal between the setpoint
and the block temperature to establish the output signal. When this parameter is very high,
the output reaction is very quick, however this can take the system into oscillation.
Decreasing this parameter, the dry block would not be able to react quickly enough to
external variations, giving the impression of a sudden out of control.
The I parameter (integral gain) is responsible for the integral action and it is the
most important part in the setpoint control. While an error persists between the setpoint
and the block temperature, the integral action will actuate on the output signal until the
error is brought to zero.
The D parameter (derivative gain) is responsible for the derivative action that
provides a quick response at the control output resulting from any rapt variation in the
Page 24
Initial
value to
Standard
record
indication
(°C)
150.0
149.96
350.0
349.93
600.0
598.03
750.0
745.32
850.0
843.13
1000.0
990.45
1100.0
1087.11
TA-1200PLAB
New
New value to
indicatio
record
n of the
Standard
150.0
150.01
349.9
349.99
598.0
600.02
745.3
749.99
843.1
850.03
990.4
999.97
1087.1
1100.05
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