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Chapter 3. Operation
70 Sentinel™ User’s Manual
3.6 Configuring and Calibrating the Analog Outputs
Every Sentinel flow meter includes two built-in analog outputs (A and B) at terminal block J1. Before beginning
calibration of these outputs, an ammeter must be connected to the desired analog output. Both the zero-point and
the full-scale values for all of these outputs must be calibrated. After calibrating the outputs, which have a resolution
of
5.0 uA (0.03% of full scale), their linearity should be tested.
Note: The zero point of the analog output may be set to either 0 mA or 4 mA. However, the calibration always uses
the 4 mA point, and the meter extrapolates this value to obtain the 0 mA point.
3.6.1 Configuring the Analog Outputs
Prepare for calibration by inserting an ammeter in series with the load on the desired output. See Figure 3-7 below to
identify the OUT(+) and RTN(-) pins.
Figure 7: Ammeter Connection (Output A)
Use the PanaView
Recorder Properties
to calibrate an Analog Output. To access these menu options, complete the
following steps:
1. Make sure the system is connected to your computer, the system and the computer are turned ON, and
PanaView is up and running.
2. Under File open the New Meter Browser.
3. Expand the drop-down menus until you access the meter and its submenus. Expand the last meter submenu,
Unassigned I/O .
4. Double-click on Recorder 1 or Recorder 2 to bring up the Analog Output properties window. Under the General tab,
select the desired option from the
Type
drop-down menu (see Figure 49 on page lxxi ).
CAUTION!
The load on the analog output must not exceed 600 W. Do not connect the ammeter
directly across the analog output terminals.
B
RTN SIG
B
RTN
A
SIG
A
1 4
Ammeter
– +
Load
Terminal Block J1