Additional Performance Enhancement
After performing the initial span calibration or after running a material test P10, P11, P12, P13, P14, P16, and
P18 may be altered to enhance the display readings and analog mA output. These direct access parameters
are explained in detail in Parameters.
RECALIBRATION
Design Changes
Some parameters interact with others. After altering a parameter value check all other parameter values. The
Compu-M may have altered one or more interacting parameters automatically. Record all parameter value
changes on the Design Data Sheet and Programming Chart for future reference.
Recalibration
To maintain Flowmeter accuracy, periodic zero and span recalibration is recommended. Recalibration
requirements are highly dependent upon the severity of the application operating conditions. Perform frequent
checks initially, then as time and experience dictate, the frequency of these checks may be reduced. Always
record any deviations experienced for future reference.
Routine Zero
To perform a routine zero recalibration, ensure the material flow is stopped and the prefeed is locked out.
press
"ZERO"
[oo ####]
displayed, Current Zero Count
press
"ENTER"
[oo ####]
displayed momentarily then,
[od ####]
displayed, Zero Deviation in %
press
"ENTER"
[oC ####]
displayed, New Zero Count, zero complete
If
[oo E3]
displayed, routine zero attempt aborted, zero deviation is greater than the limit as set by P-25.
The
[E3]
Display Message normally indicates a mechanical problem. Investigate the cause
of the deviation and make the correction necessary. Retry the zero calibration.
If the deviation is determined to be acceptable, perhaps as the result of an intended
mechanical change to the system, set P77 to 1 to invoke a new " Initial Zero
Calibration Reference". Any future deviation will be based on this new Zero.
PL-516 54
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