CiDRA SONARtrac PW VF-100 - Manual (Page 154)

20834-01 Rev 04 Page 8-10
8.3.1.6 4mA and 20mA Trim
The Trim function allows the user to adjust the transmitter 4-20mA
outputs to match the plant standard or loop control. The following
message screen will appear when this menu item is selected.
Figure 3 4-20mA Trim Start Message
Press ‘ENTER’ to start the test and adjust the Line 4 value to that
shown on the meter. Press
‘ENTER’ and the meter should read 4mA.
Press ‘ENTER’ and adjust the 20mA value to that shown on the meter.
Press
’ENTER’ and the meter should read 20mA. Press ‘ENTER’ to
accept the values
and then the ‘BACK’ key to leave this input.
Figure 4 4-20mA Trim Setup
These measurements will calculate and apply an offset and slope (can
be viewed on the ‘INFO>CONFIGURATION>4-20mA Channel 1 (or
2)’ screen) for the selected channel.
8.3.2 Pulse
The passive sonar meter Pulse output utilizes a solid-state relay
closure to output a pulse train corresponding to the selected
measurement parameter. The solid-state relay is rated for +30VDC to
–10VDC, 100mA maximum. An external user supplied power source
(pull-up) is connected to the (+) and (-) terminals under the word
“Pulse” on the terminal board. The Pulse Output can be configured to
output a pulse frequency or a number of pulses for one of the
following measurement parameters:
Flow Rate (VF): Outputs a frequency corresponding to flow rate
(systems with Flow).
Flow Rate %: Outputs a frequency corresponding to % of VF full-
scale range (systems with Flow).
Total Flow (Totalizer): Outputs a series of pulses corresponding
to the total number of flow units counted over the previous update
interval (systems with Flow).