Raco Verbatim, Owner'S Manual

Page: 101 / 246

Analog Signal Input
Verbatim Owner's Manual B-7
Continue the example, there might also be a discrepancy toward the low end of
the scale. Suppose on another day you observe a tank level of 22.5 feet but the
Verbatim report 2293 feet. Since this signal is at the low end of the range, you
would enter:
5 06 1 POINT ENTER
and
5 06 2 22.5 ENTER
Note:
These Real-World Method adjustments did not require you to measure any
actual signal levels!
From that time on, assuming that the sensor maintains its calibration and has a
linear output, the spoken value should track the actual value very closely. The
Verbatim itself is much more accurate and consistent than almost any sensor
available to connect to it. Note that the signal does not need to be exactly at the
end of its range (e.g. 4 ma or 20 ma) for these programming steps. However, in
general the wider the spread between the signal levels used, the better informed
the Verbatim will be to reflect the actual relationship between the sensor’s
output and the real value being measured.
Note:
While the unit reports with very high accuracy and resolution, you do not
need to enter your programming value to the same high degree of accuracy
unless you choose to.
For TS705 Temperature Sensor Inputs
Selecting signal type “2” (TS705 sensor) will automatically load scaling factors
as describe earlier. However, these automatically loaded scaling factors are not
adjustable. If you want to be able to do Real World calibration adjustments for
temperature sensor inputs, then instead of selecting sensor type “2”, select
sensor type “1” (0-1 VDC input) and enter scaling factors as follows:
5 ZZ 7 1 ENTER
(Selects signal type 1)
5 ZZ 1 .843 ENTER
5 ZZ 2 -19.8 ENTER
5 ZZ 3 .316 ENTER
5 ZZ 4 120.1 ENTER