ViewSmart 200/2050/2150 Controller User's Manual
Document: UM-1021
Revision Level B
12
monitoring 0 to 10ppm chlorine, then the
Zero
value should equal 0.000 and the
Span
value equal 10.00. Four digits must be entered so trailing 0’s may appear here that are
not displayed on other data screens.
2.2.4c DECIMAL POINT RESOLUTION
Resolution of the displayed channel value is configured in this menu by setting the
number digits trailing the decimal point. Displayed readings are limited to a maximum of
four digits with a polarity sign. Auto-ranging displays the highest resolution allowed by
this menu’s decimal point entry. For example, a range of 0 to 100ppm and two decimal
points reads
0.00
at 0ppm and
100.0
at 100ppm. This may be undesirable due to the high
resolution at zero unless the sensor’s output is extremely stable. If decimal points are
limited to one, the 0ppm reading becomes
0.0
and the 100ppm reading remains
100.0
.
Resolution may be limited further by setting decimal points to 0 where in the above
example, 0ppm reads
0
and 100ppm reads
100
.
2.2.4d TURNING OFF UNUSED CHANNELS
The
Channel Active?
menu entry asks if this channel is to be utilized.
OFF
causes the
controller to never process inputs applied to this channel and no alarms are tripped or
data displayed. Inactive channels have a line drawn through them on the Setup screen to
indicate it is turned off.
2.2.5
CAL SETUP MENU
The ViewSmart 200 CAL MODE feature supports pushbutton calibration of zero and
span values. This feature should be utilized only when there are no other zero/span
controls within the monitoring system since it is inappropriate to calibrate a signal at
more than one point. Therefore, if calibration will be performed at another transmitter or
monitoring device, the ViewSmart 200 CAL MODE feature should not be used.
The
CAL SETUP
menu allows entering the correct
Zero Gas
&
Span Gas
set-point
values needed to calibrate the sensor. These are entered in the same engineering units as
input range.
Figure 2.6
