Startup and operation
Page 32
RES-440
Version 1
One very important design feature is the copper or silver-plating of the heatsealing band ends. Cold ends allow
the temperature to be controlled accurately and increase the life of the teflon coating and the heatsealing band.
An overheated or burned-out heatsealing band must no longer be used because the TCR has been
altered irreversibly.
9.4.2
Burning in the heatsealing band
If a new heatsealing band has been used, the zero point is first of all calibrated while the band is still cold by acti-
vating the "AUTOCAL" function on the controller. When the "AUTOCAL" function has finished, the controller out-
puts the preselected calibration temperature (default value: 20°C). Adjust the set point to approximately 250°C
and press the "HAND" key (display in home position) to heat for approximately 1 second. After recooling, the con-
troller usually indicates a value less than 20°C. Repeat the "AUTOCAL" function. The heatsealing band has now
been burned in and the change in the alloy properties stabilized.
The burn-in effect described here does not occur if the heatsealing band has already been thermally pretreated
by the manufacturer.
9.4.3
Replacing the heatsealing band
All power supply leads must be disconnected from the RESISTRON
®
temperature controller in order to replace
the heatsealing band.
The heatsealing band must be replaced in accordance with the instructions provided by the manu-
facturer.
Each time the heatsealing band is replaced, the zero point must be calibrated with the AUTOCAL function while
the band is still cold, in order to compensate production-related resistance tolerances. The burn-in procedure
described above must be performed for all new heatsealing bands.
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