APPLICATIONS (Cont’d)
SOLIDS FLOWMETER APPLICATION
OPERATION
Input Signals
The Compu-M supplies the excitation for the flowmeter transducing element, (LVDT or load cell). Material
flowing through the flowmeter is directed toward a sensing plate. The sensing plate is designed to deflect
horizontally proportional to material flow. This horizontal deflection is applied to the transducing element
which produces a signal proportional to material flow.
Signal Processing
The Compu-M utilizes the material flow signal to produce an internal rate signal. Utilizing advanced
microprocessor technology, the Compu-M converts the internal rate signal to provide display, analog output,
remote totalizer contact and rate alarm.
Display Modes
Two operator selectable display modes are available (RATE or TOTAL). The modes can be scrolled manually
by pressing ’ALT DISP’ or automatically by setting P21, auto scroll display.
The Rate Display represents the rate at which material is currently flowing through the system. This display, in
operator selectable engineering units, may be stabilized by the level of damping programmed, (P11).
The Total Display represents the total amount of material which has passed through the flowmeter since the
last Compu-M (local) totalizer reset. The operator may reset this display to zero (0) at any time, depending
upon the access security level programmed, by pressing
"RESET TOTAL", "CLEAR".
Analog mA Output
This DC current output is proportional to the current rate of material flow and may be utilized for operating
external process monitoring and/or process control equipment. The minimum output corresponding to
minimum (usually 0) flow is user selectable (P12) for 0 or 4 ma. The maximum output corresponding to
maximum desired material flow is 20mA. The analog mA output is stabilized by the damping values entered in
P11 or P18.
Remote Totalizer Contact
The Compu-M provides a relay contact closure which may be utilized to operate an external device such as a
remote mounted totalizer. The on-time duration of the relay contact closure is operator selectable (P16) to suit
the external device connected.
PL-516 45
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