Download M18i UM - Cryogenic Control Systems, Inc.

Model 18i Temperature Monitors
Instrument Calibration
Instrument Calibration
Calibration of the monitor requires the use of various voltage and resistance standards in order to
generate calibration factors for the many measurement ranges available.
Calibration is ‘Closed-Case’. There are no internal mechanical adjustments required. The monitor cannot
be calibrated from the front panel.
Calibration data is stored in the instrument’s non-volatile memory and is accessed only via the remote
interfaces. Calibration of a measurement range is the simple process of generating an offset and gain
value. However, since there are several input ranges available on each sensor input, the process can be
time consuming.
Caution: Any calibration procedure will require the adjustment of internal data that can
significantly affect the accuracy of the instrument. Failure to completely follow the
instructions in this chapter may result in degraded instrument performance.
The Cryo-con utility software used in this procedure will first read all calibration data out of
the instrument before any modifications. It is good practice to record these values for future
reference and backup.
Cryo-con Calibration Services
When the instrument is due for calibration, contact Cryo-con for low-cost recalibration. The monitor is
supported on our automated calibration systems which allow Cryo-con to provide this service at
competitive prices.
Calibration Interval
The monitor should be calibrated on a regular interval determined by the measurement accuracy
requirements of your application.
A 90-day interval is recommended for the most demanding applications, while a 1-year or 2-year interval
may be adequate for less demanding applications. Cryo-con does not recommend extending calibration
intervals beyond 2 years.
Whatever calibration interval you select, Cryo-con recommends that complete re-adjustment should
always be performed at the calibration interval. This will increase your confidence that the instrument will
remain within specification for the next calibration interval. This criterion for re-adjustment provides the
best measure of the instrument’s long-term stability. Performance data measured using this method can
easily be used to extend future calibration intervals.
Calibration Procedure
Please contact Cryo-con for a complete calibration procedure.
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