User manual

be altered. The correct values are important to the accuracy and proper and
safe operation of the instrument. Access to these parameters is available to
the user so that in the event that the controller memory fails the user may
restore these values to the factory settings. The user should have a list of
these constants on the Report of Calibration that ships with the instrument.
Caution: DO NOT change the value of the instrument calibration con
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stants from the factory set values. The correct setting of these parame
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ters is important to the safety and proper operation of the unit.
The calibration parameters menu is indicated by,
CAL calibration parameters menu
Press the “SET” button five times to enter the menu. The name of the pa
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rameter flashes on the display and then the value is displayed. The value of
the parameter may be changed using the “UP” and “DOWN” buttons. After
the desired value is reached press the “SET” button to set the parameter to
the new value. Pressing the “EXIT” button causes the parameter to be
skipped ignoring any changes that may have been made.
7.13.1 R0
This probe parameter refers to the resistance of the control probe at 0°C.
The value of this parameter is set at the factory for best instrument
accuracy.
7.13.2 ALPHA
This probe parameter refers to the average sensitivity of the probe between
0 and 100°C. The value of this parameter is set at the factory for best instru
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ment accuracy.
7.13.3 DELTA
This probe parameter refers to the curvature of the resistance-temperature
relationship or the sensor. The value of this parameter is set at the factory
for best instrument accuracy.
7.13.4 BETA
This probe parameter characterizes the low temperatures. The value of this
parameter is set at the factory for best instrument accuracy.
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User’s Guide
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