Chapter 4: Lyo-Works Operating System
Product Service 816-333-8811 or 1-800-522-7658
7. Calibration – Some sensors in the Freeze Dryer can be calibrated. This
process should be done by a qualified technician or metrologist with reference
sensors that are known with certainty. An external reference sensor must be
placed at the same measurement point (as close as physically possible) as the
sensor being calibrated. The Collector and Shelf temperature sensors have
their own reference thermocouple (type T) built into each sensor. Each
thermocouple is a pair of wires (red & blue) sheath with a brown outer casing.
They are located inside the housing of the Freeze Dryer and can be accessed by
removing the back panel. A thermocouple meter can be used to read the
thermocouple value as a reference value.
Current Reading (uncorrected) – This gives the raw sensor reading
with no offset applied to the reading.
Offset – This is the value that will be added to the Current Reading
(uncorrected) to give the proper adjusted reading that matches the
reference sensor being used for calibration. The adjusted reading
(uncorrected + Offset) is the value that will be presented on all screens
outside of the Sensor Calibration screen. Pressing the Offset field of
the desired sensor will bring up a dialog box for entering the offset
value for the selected sensor.
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