DFM 6.1 INSTRUCTION MANUAL
16
CALIBRATION (cont.)
Damping
Choose between OFF, FIR (Default), or LOW PASS.
Mode
When measured flows are outside the Window of the
running average, the FIR filter will reduce the damping
average so that a fast response can be made to the
sudden change in flow rate.
The LOW PASS filter will ignore measured flow rates
outside the Window, while holding the running average,
until there are enough data points outside the Window
to cause a step-response to the new measured value.
While measured flows are within the Window of the
running average, both the FIR and LOW PASS filter
behave the same.
Percent
Higher percentages increase the number of
measurements which are averaged together to produce
a stable flow reading. Higher percentages also increase
the time it takes for the meter to make a step-response
to the measured flow rate outside the Window in the
LOW PASS Mode.
Window
Defines the Window around the running average, in
units of Velocity set in the Units/Mode menu.
Measurements made inside the Window are added to
the running average, and measurements outside the
Window effect the response of the meter as described
in the Mode section.
Pipe ID
Place the cursor under the digits and then or to
change the numbers and decimal point. Pipe ID
should be entered as the exact inside diameter of the
pipe where the sensor is mounted. Refer to the Pipe
Charts Appendix in this manual for inside diameter of
common pipe types and sizes.
Cal Constant
Scales the velocity reading. Factory value is close to
1.000 for a SE4-A sensor.
Press to return to Menu Selections screen.
- - Ca l i b r a t i o n - - - - - - -
Mo d e Fl o w
2 0 mA 5 0 0 USG/ m
4 mA 0 USG/ m
M 5 . 0 0 USG/ mi n Fl o w
Si g n a l Cu t o f f
Da mp i n g
Mo d e FI R
Pe r c e n t 1 0 %
Wi n d o w 1 . 0 f t / s
Pi p e I D 4 . 0 3 i n
Ca l Co n s t a n t 1 . 0 0 0
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