Cannon Instrument miniAV-X - Manual (Page 35)

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CANNON ® miniAV ® -X Automatic Viscometer with VISCPRO ® Instruction & Operation Manual
Version 1.0— February, 2008; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
CHAPTER
3
CALIBRATING THE miniAV-X
Calibration is essential for the proper operation of the miniAV-X. The
miniAV-X is calibrated before it is shipped to the customer. It should be
calibrated again after installation. Frequency of recalibration is at the
discretion of the user. There are two types of calibrations—the tempera-
ture calibration ensures that the temperature probe readings conform to
the reference thermometer, and the standard calibration ensures that the
mathematical constants used in calculation of kinematic viscosity from
sample flow times accurately reflect the unique properties of the viscom-
eter tube. The temperature calibration should be performed first.
Calibrating temperature
Periodically, the temperature display of the miniAV-X Bath Unit should
be verified using a reference thermometer for that temperature. The
miniAV-X temperature control system permits the calibration of the bath
temperature to agree with any temperature reference standard, including
an ASTM thermometer mounted within the bath. The bath can be cali-
brated by the user whenever the bath temperature is stable for any given
target temperature in degrees Celsius or Fahrenheit.
NOTE The calibration data is stored in the VISCPRO II software database.
It is important to remember when moving the minAV-X from One PC to
another, the samples.mdb file should also be copied to the new PC to
keep from having to recalibrate the instrument. After calibrating the
temperature (or changing any configuration setting) the user should save
the instrument and tray settings- Save Instrument and Tray Settings under
the Configure menu. [This will insure that the proper settings will be
available if something happens, such as the serial port is changed.]
Calibration procedure
NOTE Depending on security level settings, it may be necessary for you to log
in as a manager to complete the calibration.
1. Set the bath to the desired calibration temperature and make certain
the reference thermometer temperature has stabilized.
2. Click Service/Temperature Calibration for the desired instrument.
3. To calibrate temperature, enter the current temperature reading to the
nearest 0.01°C into the Temperature: field, subject to the following:
A decimal point MAY be included as an entry. It should be preceded
by at least two numbers or a "0".