KROHNE Summit 8800 Vol 1 - Manual (Page 86)

86 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol1 R02 en
SUMMIT 8800 CALIBRATION 08
• Apply the current that corresponds with the minimum process value to the unit. Note that
only 0% (4mA) and 100% (20mA) values will be accepted. It is not possible to calibrate a range
with e.g. 40% and 75% as minimum and maximum calibration values. Set the field instrument
in simulation mode and simulate 0% (4mA). For below two adjustments allow for input value
stabilisation (e.g. 30 seconds) and assume that stabilisation is reached when input values
have oscillated 5 times around the assumed final value. In above example: type in -50C and
click the upper SET button. Simulate 100% (20mA) and click the lower SET button. Repeat
above two steps 3 times over. Click the WRITE button to store the results.
• Calibrate the input by simulating 0%. Does the uncalibrated value field read -50 degrees Cel-
sius? Simulate 100%.
• Does the uncalibrated value field read 150 degrees Celsius?
• Click the END CALIBRATION AND CLOSE button to leave the analog input calibration menu.
Analog Input Calibration Procedure
• Apply the Lower Calibration input to the unit (e.g. set the 4-20mA Input to 4.8mA i.e. 5% - 5
bar)
• Type in 5.0 to the Wanted box for Point 1 above.
• Press the Set button for Point 1
• Wait for stabilization.
• Apply the Upper Calibration input to the unit (e.g. set the 4-20mA Input to 19.2 mA i.e. 95% -
95 bar)
• Type in 95.0 to the Wanted box for Point 2 above.
• Wait for Stabilization.
• Press the Set button for Point 2.
It will be necessary to repeat the above steps a number of time until the predicted value is stable
and correct for both the lower and upper calibration points.
Once the Calibration is correct and stable for both points press the Write button to commit the
calibration to memory.
Select the Close button to exit the Analog Input Calibration menu.
8 .1 .4 Digital Input
The Digital Inputs do not require any customer calibration.
8 .2 Output Calibration
8 .2 .1 Analog Output
The factory calibrated analog output signals normally do not require customer adjustment. It is
recommended that the SUMMIT 8800 outputs be calibrated and adjusted if necessary.
Main Controls:
Start calibrate
starts the calibration process
Write write the new calibration data to the connected flow computer
Discard discards any calibration changes made.
Default reverts to default factory calibration.
Stop calibrate stops the calibration process.