GOSSEN-METRAWATT GMBH 30
Calibration
Thermocouple correction (parameter CAL)
This correction value is set in °C / °F. The correction value displayed is added to the measured temperature value.
Lead calibration with Pt 100 two-wire connection (parameter CAL)
The calibration can automatically be determined in "Off / manual mode".
– Short sensor at measuring site.
– Set CAL value to Auto
The lead resistance measured is converted into a temperature change and entered as CAL value.
If the sensor temperature is known, manual calibration is also possible: CAL = known sensor temperature – displayed temperature.
Scaling of the heating current monitor (parameter A H)
The standard setting for GTZ 4121 is 42.7 A. If the current transformer GTZ 4121 is not used to acquire the heating current, set the current value at
which the transformer used provides 10 V DC.
Calibrating the position readback display (parameter Y100, Y 0)
Calibration is made in manual mode on the parameter level at a configuration as step controller (configuration digit "controller type" = 6):
1. Select parameter Y 100, the stored value appears at first: a standardized value between 0 and 255.
The rotary knob, kept at the right stop, directly serves the switching output I (more) and the display shows the actually measured position of the con-
trol element. Keep the rotary knob at the right stop until the displayed value changers no longer. The displayed value is stored.
2. Select parameter Y 0.
Proceed same as for parameter Y 100. In this case, the rotary knob must be kept at the left stop. It directly serves the switching output II (less).
Y 100 must be higher than Y 0!
The parameters Y 100 and Y 0 are only displayed in automatic mode.
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