Local Operation
Menu
4
4-21
Set-point Pressure and Tolerance
Each set-point in the program requires both a
pressure
and a
tolerance
in the current
units of measure. For example, one set-point might require a tolerance as low as 0.05 psi
(0.35 kPa), whereas another set-point in the same program could be satisfied with a
tolerance as high as 5 psi (0.35 kPa).
Dwell Time
Once the pressure is within the specified tolerance, the Calibrator starts a timer that runs
for a user-defined number of seconds. This is referred to as
dwell time
. As long as this
timer is running, the Calibrator will remain at the designated set-point unless the
max
time
(see below) elapses. When the
dwell time
expires, the Calibrator will proceed to
the next step. Typically the
dwell time
should be set to a value less than the
max time
.
Usually
dwell time
has a value of a few seconds, but a value of 0 can be used to create a
pause in the program. When the
dwell time
is set to zero, the Calibrator switches to
manual control once it is within the tolerance value of the set-point pressure. The user
must then press a key on the front panel to continue the program.
MaxTime
The
max time
is the maximum time in seconds, including the
dwell time
, that the
Calibrator can spend on one step of the program. After the
max time
elapses, the
Calibrator will automatically proceed to the next set-point in the program, even if the
current set-point has not been achieved. Thus, the
max time
selection limits the amount
of time that the Calibrator can spend on any one set-point. Typically the
max time
should be set to a value greater than the
dwell time
. If the
max time
is set to zero, the
Calibrator will attempt to achieve the set-point indefinitely (i.e. the
max time
function is
disabled).
Mode of Entry
If the upscale portion of the desired pressure step sequence
and
the downscale portion of
the sequence both have the same highest and lowest set-points
and
consist of evenly
spaced steps, the <Auto> option can be used to automatically generate the program.
However, if any part of the sequence includes unevenly spaced steps, or the starting and
ending set-points are not the same, each step must be programmed individually. In the
example given at the beginning Chapter 4, Menu | Program – Storing a Sequence in
Memory, each step must be programmed individually since the starting set-point is 30 psi
and the ending set-point is 20 psi. Detailed instructions for entering these items are given
in the sections that follow.
Entering a New Program
To program the Calibrator, use the keys on the front panel to change values on the
Calibrator’s program editing screen. Instructions for entering each step of a new program
are included below.
1.
Ensure that the units, limits, and control parameters have been set to the desired
values.
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