Direct Span Entry
Direct entry is intended for use when replacing software or hardware and
it is not convenient to perform an initial span at that time.
select P68
press "ENTER"
[P6 80] displayed
press "1"
press "ENTER"
[P6 81] displayed
press "ENTER"
[P c0.] displayed e.g. value ’0’ after a P99 reset
enter the recorded span reference count of the previous span (#####)
press "ENTER"
[S C#####] displayed, new span count, entry complete
Self Initiated Auto Zero
Where frequent minor zero deviations are expected, the Compu-M self initiated auto zero feature may be
utilized to perform an automatic zero calibration whenever the material flow ceases.
Connect a dry contact activated by a material prefeed control device such as a prefeed motor, material control
gate, or valve to board B 1TB-1 and 2 of the Compu-M. The contact must be closed while the material prefeed
is stopped.
While this contact is closed and after sensing no material flow through the flowmeter, the Compu-M will
perform an auto zero. If the difference between the auto zero and the last operator initiated (routine) zero
calibration is less than 2% of the design Rate (P1), the Compu-M will accept the auto zero results.
If the difference between the auto zero and the last routine zero is greater than 2% of the design Rate, the
Compu-M will display [E9 - auto zero out of range] temporarily, reject the results of the auto zero attempt and
then resume normal operation.
If the alarm relay is set for auto zero (P20 =3), the relay is de-engerized and the display flashes. The alarm is
in effect until an auto zero within range occurs, when a calibration is initiated, or when the rate exceeds 12%
of design.
If the Compu-M displays [E9] after repeated auto zero attempts, the operator should perform a routine zero
calibration. Future auto zero attempts will be referenced to this new zero calibration.
The Compu-M will continue to perform auto zero calibrations until the prefeed activated contact connected to
TB1-1 and 2 is open. Any material totalized during a self initiated auto zero is added to the Compu-M total and
the remote total. The analog mA output will respond to any material measured during a self initiated auto zero.
PL-516 57
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