Matheson 819 Series, Operating Manual

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MISCELLANEOUS
Miscellaneous
is accessed by pressing the
MISC
button on the Select Menu display.
Next select either
MISC1
or
MISC2.
MISC1
will display as shown at left.
ZERO BAND
refers to Display Zero Deadband.
Zero deadband is a value below which the display
ZERO
BAND
PRESS
AVG
LCD
FLOW
AVG
jumps to zero. This deadband is often desired to
prevent electrical noise from showing up on the
display as minor flows or pressures that do not
exist. Display Zero Deadband does not affect the
analog or digital signal outputs.
BACK CONTRAST MAIN
ZERO BAND
can be adjusted between 0 and
6.3% of the sensor’s Full Scale (FS).
Press
ZERO BAND.
Then use SELECT to choose
the digit with the arrow and the UP and DOWN
buttons to change the value. Press SET to record
your value. Press CLEAR to return to zero.
Pressure Averaging and Flow Averaging
may
UP
DOWN
0.0
SELECT
be useful to make it easier to read and interpret
rapidly fluctuating pressures and flows. Pressure
and flow averaging can be adjusted between 1
(no averaging) and 256 (maximum averaging).
These are geometric running averages where
CANCEL CLEAR SET
the number between 1 and 256 can be
considered roughly equivalent to the response
time constant in milliseconds.
This can be effective at “smoothing” high
frequency process oscillations such as those caused by diaphragm pumps.
Press
PRESS AVG.
Then use SELECT to choose the digit with the arrow and the UP and
DOWN buttons to change the value. Press SET to record your value. Press CLEAR to
return to zero.
Press
FLOW AVG
. Then use SELECT to choose the digit with the arrow and the UP and
DOWN buttons to change the value. Press SET to
record your value. Press CLEAR to return to zero.
Setting a higher number will equal a smoother
UP
DOWN
11
CANCEL RESET SET
display.
LCD CONTRAST:
The display contrast can be
adjusted between 0 and 31, with zero being the
lightest and 31 being the darkest. Use the UP
and DOWN buttons to adjust the contrast. Press
SET when you are satisfied. Press CANCEL to
return to the MISC display.