Brooks Instrument 0254 - Manual (Page 36)

3-10
Model 0254
Section 3 Operation Installation and Operation Manual
X-SE-0254-eng
Part Number: 541B129AAG
September, 2010
Decimal Point
The decimal point for values may be freely selected for none, one, two, or
three places. The decimal sets the number of measurement value digits
that are to the right of the decimal point. Setting the decimal has an
arithmetic function that, when changed, automatically multiplies or divides
an existing value so values continue to retain their power-of-ten value. The
values so affected include PV and SP Full Scale, SP Rate, SP Batch.
Gas Factor
This value is a unit-less factor by which measured PV Signals are
compensated by multiplication, and SP Signals corrected by division. This
instrument performs the arithmetic compensation using the Gas Factor.
This capability makes it possible to compensate other gases that are not
the calibration gas. However, the existing Gas Factor must be known and
then methodically changed. By knowing the present factor for the
calibration gas, and desiring to control known gases for which an attached
TMF has not been calibrated, then just divide the new gas factor by the
previously known calibrated gas factor. The result becomes the new Gas
Factor.
Log Type (Future Option)
All logging option selections should be set to Off.
PV-SP Signal Types
Signal Selections May be set for full scale ranges which include
0–20 mA, 4–20 mA, 0–5 V, 1–5 V, 0–10 V,
2–10 V, or OFF.
OFF selection Suspends service for either or both channel PV
and SP signals. Inactive OFF is indicated on the
home screen as a blank line.
PV-SP Full Scale
This value sets the maximum engineering unit range over which the Signal
Type is valid. The minimum is always presumed to be zero.
SP Function
The allowable setpoint Functions are Rate, Batch, or Blend.
Rate The value set in SP Rate is converted to a
corresponding analog signal, which is directly
sent to the channel analog signal output. Refer to
"3-6-1 Rate Control/Setpoint Control" on p. 3-15
for more details.