EZT-570S User Manual
116
8.7 Monitor Offset Calibration
The analog inputs associated with the control loops, i.e., temperature, humidity, product, etc., are not
accessible through this menu item. They must be accessed directly from the PID loop controllers.
See Chapter 4, “Calibration”, of the Future Design Controls, FDC-9300 Self-Tune Fuzzy / PID
Process / Temperature Controller User’s Manual or Chapter 5 “Calibration”, of the FDC C21/C91
Auto-Tune Fuzzy / PID Process / Temperature Controller User’s Manual provided with your chamber
for procedures and instructions on calibrating the control inputs.
Do not alter any other parameters or settings within the 9300 or C21 controllers. Any
changes made to CSZ factory settings may cause unpredictable operation of the
chamber which can result in damage to equipment and will void the chamber warranty.
The Calibrate/Offset menu will appear if your chamber is equipped with the optional monitor inputs
package. The monitor option provides up to eight thermocouple inputs for monitoring temperatures
throughout the chamber. The calibration range is fixed within the EZT-570S hardware; however, the
user can input an offset in order to adjust for sensor tolerances and lead affects.
Through the use of a simple ice bath, all sensors can be corrected within a matter of minutes without
having to disconnect leads or have expensive calibration equipment. With the chamber at ambient
temperature, place a bucket of ice filled with water in the chamber. Place all monitor input
thermocouples into the ice bath. Allow the probes to soak for a minimum of 30 minutes BEFORE
entering an offset.
Figure 8-20 Monitor Offset calibration
Select the desired input by using the navigation arrows at the top right of the screen to enter an offset
for a monitor input. The current value of the input and applied offset will be shown. The reading
should be 0°C (32°F), i.e., the ice bath temperature. To “zero” the input, enter the offset value in the
“Offset” field and verify the reading. Be sure to press the “Save” button to save the new offset value
before proceeding onto other inputs or leaving the screen or the offset value will not be used. The
total error for the monitor inputs is +3.5°C (6.3°F).
Changing Monitor Input Names
The name of each monitor point can also be changed by the user to better describe the measurement
it is performing. To change the name of a monitor point, touch the name of the monitor point. A
keypad will be shown allowing a new name to be entered (up to 17 characters) for the monitor point.
Summary of Contents for EZT-570S
Page 150: ......
