Model PD655 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.
