Precision Digital PD650 - Manual (Page 68)

Model PD650 Large Display Process Meter Instruction Manual
68
Rate Meter Operation
Overview
The meter can also be used to display flow rate and is available with a low-flow
cutoff feature. Totalizer functions can be excluded from the menu scroll through
the dsplay menu function, if the user is not interested in total display.
Display Rate (dSPy r)
The user may toggle between a display of process/rate or total at any time. When
displaying process/rate, the process/rate LED indicator will be illuminated. To
change the display to rate:
To change the display from reading total
to rate
Press ENTER to begin scrolling through the
functions.
When display rate (dspy r)
appears, press ENTER.
The meter now displays rate and the green
“R” LED on the right side is illuminated.
Low-Flow Cutoff (CutoFF)
The low-flow cutoff feature allows the meter to be programmed so that the often-
unsteady output from a differential pressure transmitter at low-flow rates always
displays zero on the meter. For instance, if the low-flow cutoff is set at 50, any
flow rate below 50 will result in a display of zero on the meter.
The totalizer in the meter accumulates based on the rate display. This means
that when the rate display is zero, even as a result of the low-flow cutoff, the
totalizer will not accumulate.