User manual

Smart Interface User Manual
20 IM-SIP-B
Read Curve
The Read Curve screen displays a graph of the calibration data stored in
the Smart electronics. Unless you need to change the factory calibration,
there is no need to use ANY function on this screen. The purpose of the
Read Curve screen is to enable viewing of the raw sensor data that is then
linearized (conditioned) to read out in a form easily output and displayed.
The Smart electronics stores the raw calibration for each range in the on-
board non volatile ram.
If you have a requirement to change the characteristics of the flow
measuring system by adjusting the factory calibrated curve this screen
provides infinite adjustment to alter the sensor calibration. For example,
if the factory calibration indicates values lower than the actual values,
record the BV and FLOW (Y) for the desired range and edit the values
in the flow curve. By editing, the curve will adjust showing how the
system will fit the curve to the new data. The blue dots represent the raw
data, the red line represents the fitted curve and the green line represents
the curve presently residing in the Smart electronics. If the red and green
lines differ after changing the data, select Save Data and Burn Prom to
load the new data into the Smart electronics. For your protection, the
Save Data and Burn Prom command is password protected and should
only be used after consulting a Sierra factory representative.
Figure 4.
Read Calibration Curve
Switch between
0-5 VDC or 4-20 mA
output data
Graph tools
Graph detail
Data burned into
memory
Current point selected on
the flow curve
Adds data point
fields
Select Arrange Data to
sort and re-distribute the
BV/Flow values
Caution!
Do not change the last flow
value (factory full scale,
47.00 in this example)
Calibration flow
curve
Select Restore to
revert to the origi-
nal configuration
settings
Select Read Prom
to read the data
stored in the Smart
electronics
Select Save Data
and Burn Prom
to write new cali-
bration data into
the Smart elec-
tronics
Adjustable BV/Flow values