Athena 18C Series, Руководство по эксплуатации

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21
Display Parameter Available Selections

Bias (Display off set)

to

- Use the or to set the bias value. Bias
allows the operator to compensate for any difference between sensor
temperature and the point to be measured. The process display and
setpoint will be offset by the value entered here.

Lower Limit of Scale

to

- Use the or to set the value of the lower
limit of the scale.

Upper Limit of Scale
  
- Use the
or to set the value of the
upper limit of the scale.

Filtering

- Use the
or to set any fi ltering delay (in seconds)
between 0.1 and 10 seconds. In the Input menu, fi ltering changes the
speed for the process value display only, it does not affect control. This
parameter is mainly used to slow down the flickering of the display when the
decimal position chosen is greater than zero.

Lower Setpoint Limit

- Use the or to set the value of the lower limit of
the setpoint, i.e. lowest value of the span of the sensor.

Upper Setpoint Limit

- Use the or to set the value of the upper limit of
the setpoint, i.e. the highest value of the span of the sensor.
I
F A
L
INEAR
I
NPUT
T
YPE HAS BEEN SELECTED
,
THE FOLLOWING OPTIONS WILL SUBSEQUENTLY APPEAR IF THE
BUTTON IS SELECTED
.
Display Parameter Selections

Bias (Display off set)


Lower Limit of Scale


Upper Limit of Scale


Filtering


Lower Setpoint Limit


Upper Setpoint Limit

Example 1
: A cooling process with a pressure
sensor that provides a 4 - 20mA output / input
to the controller. The sensor measures between 0
and 220psi but the process needs to be controlled
between 50 and 75 psi.
Display Parameter Selections

Bias (Display off set)


Lower Limit of Scale


Upper Limit of Scale


Filtering


Lower Setpoint Limit


Upper Setpoint Limit

Example 2
: A humidity control process has a sensor
with a 0 - 5 V output / input to the controller. The
sensor measures between 0 and 100% relative
humidity but needs to control the process between
40% and 60% relative humidity.