Cannon Instrument CMRV-4500 - Manual (Page 40)

34
CANNON ® Mini-Rotary Viscometer CMRV-4500 Instruction & Operation Manual
Version 1.1e—October, 2011 • CANNON ® Instrument Company
2139 High Tech Road • State College, PA • 16803 • USA
NOTE In each calibration session, the initial probe calibration must be per-
formed at 80°C (see procedure below) before calibrating at other tem-
peratures. When prompted by the VISCPRO software: "Do you want to
zero the offset at 80°C before calibrating?", click YES the first time in the
session that you attempt to calibrate at 80°C. Thereafter, click NO unless
you would like to start the calibration over from the default offset value.
The CMRV unit will begin heating or cooling to the desired tempera-
ture. When it reaches temperature, a 10-minute timer will start. This
delay allows the CMRV temperature to stabilize at the calibration
temperature. Note that more time may be required for stabilization at
80°C, 50°C and 0°C. After the timed delay, the
Thermometer
Temperature °C field will become active, enabling data entry.
5. After the instrument reaches the probe calibration temperature and
completes the temperature stabilization period, type the actual
temperature from the reference thermometer in the
Thermometer
Temperature °C field. Then click the Accept button to store the
temperature calibration offset to the current instrument configura-
tion.
6. Click the Calibrate button again to reset the timer and check the
calibration for that temperature. If the reference temperature varies
from the displayed temperature, repeat steps 5 & 6.
NOTE Make certain to use the "-" key when entering a temperature below 0°.
7. Repeat steps 4 through 6 for each desired calibration temperature.
Then click to exit the Temperature Probe Calibration window.
NOTES Make certain to SAVE the instrument following a successful calibration
(File/Save Instrument). You should also print an archive copy of calibra-
tion data (click Configure/MRV/Print Instrument Settings). A partial
calibration session may enable you to run some profiles as long as the
coldest calibration offset is 5° lower than the lowest profile temperature.
Manual restoration of voltage and offset data
If the VISCPRO database is corrupted, or if temperature calibration data is lost
for any other reason, voltage and temperature offset values may be manually
restored without recalibrating the instrument. Existing data can be viewed by
clicking
Service/MRV/Temperature Probe Calibration . When the user is
logged into VISCPRO as a Manager, the Temperature Probe Calibration
window displays additional security-protected controls for manual adjustment/
restoration of voltage and offset values obtained during the probe calibration.
To manually adjust temperature offsets or voltage reference values, log into the
VISCPRO software as a Manager. Then open the probe calibration window
(
Service/MRV/Temperature Probe Calibration ). The Reference Supply
Voltages and offset fields will now be editable. Use your printed copy of the most
current instrument settings to determine appropriate values and input the values
in the indicated fields. Click
OK when the values have been entered correctly.
Then click the Accept Manually Entered Offsets and Voltages button.