Model PD690 Universal Process Meter Instruction Manual
24
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Select Square Root Extraction (L or S)
With the square root extraction function activated, the meter takes the
square root of the input signal (the output from a differential pressure
transmitter) and displays flow rate. The square root extraction feature
is calibrated using the same
S
ingle
B
utton
S
caling technique that is
used for two-point linear calibration. Calibration involves setting only
three points: the zero flow rate (usually zero), the high flow rate and
the Low-Flow Cutoff point.
To program the meter for square root extraction, push ENTER. When
(L or S) appears, push ENTER again. The meter will flash (L or S)
alternately. Push ENTER when (S) is flashing. After (S) has been
selected the meter will switch to indication mode and is ready to be
calibrated.
Program Low-Flow Cutoff ([utoFF)
Low-Flow Cutoff 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.
Example: If Low-Flow Cutoff is set at 12, any rate less than 12 will be
displayed as "0".
To program Low-Flow Cutoff:
1. Push ENTER, when [vtoFF appears push ENTER again.
2. Set Low-Flow Cutoff per
Five Basic Digit/Display-setting
Instructions
on page 19.
Notes:
1. To disable Low-Flow Cutoff, program cutoff value to zero.
2. Low-Flow Cutoff is only available when using Square Root
Extraction.
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