Outputs; Current Loop - GF PF220 V2 Betriebsanleitung

Operating Instructions
9

Outputs

9.1

Current loop

9.1.1 Setup
The flowmeter allows you to set a current output between zero and 24mA. Standard ranges include 4-20mA, 0-16mA and 0-20mA.
The current range can be used to represent only positive flow, or negative flow ranging into positive flow, or simply negative flows.
In addition to this, you may set an out-of-band value to represent an error current. For example, with a 4-20mA loop, it is common
to use either 2.5mA or 22.5mA as an error current. Nevertheless, you may set the error current to be any value that is not within
the valid measurement range. An error current can be used to indicate a number of causes including: exceeding a predetermined
value, being under a predetermined value, being out-of-bounds (value is below the minimum or above the maximum), or a loss-of-
signal condition. In addition, inhibiting the generation of an error current can be achieved by selecting the no error condition.
NOTICE
The 4-20ma current output is set in hardware to be accurate to +/- 0.3%. If you require greater accuracy than this or if there are
known inaccuracies in the measurement system, which may require compensation, then calibration values may be set at the low
and high ends of the current loop range. These values are linearly interpolated over the range of the current loop.
The default current loop setting is OFF.
To change any of these settings:
Output Board Se
Output Board Se
Current Loop Setup. . Current Loop Setup. .
Digital Device 1 Setup.
Digital Device 1 Setup.
Digital Device 2 Setup.
Digital Device 2 Setup.
Digital Device 3 Setup.
Digital Device 3 Setup.
Exit. .
Exit. .
Current Loop Se
Current Loop Se
Current Loop Status. .
Current Loop Status. .
Measurement Source Measurement Source
Value at min output
Value at min output
Min output current
Min output current
Calibrate min current
Calibrate min current
Value at max output
Value at max output
Max output current Max output current
Calibrate max current
Calibrate max current
Output error current
Output error current
Error current source
Error current source
Alarm trigger point
Alarm trigger point
Save setup & exit. .
Save setup & exit. .
Exit
Exit
DD-MM-YY HH:MM:SS
DD-MM-YY HH:MM:SS
DD-MM-YY HH:MM:SS
DD-MM-YY HH:MM:SS
Off
Off
Flow Flow
0 1/min
0 1/min
4.00 m/A
4.00 m/A
0.00 m/A
0.00 m/A
1000 1/min
1000 1/min
20.00 20.00 m/A m/A
0.00 m/A
0.00 m/A
0.00 m/A
0.00 m/A
None
None
500 1/min
500 1/min
1. From the MAIN menu, use the Up and Down scroll keys
to select Setup Instrument. Press the ENTER Key. With
Output selected in the Options menu, press the ENTER key
Alternatively, from a Read Flow/Velocity/Energy screen,
press the OUTPUTS key (3). The Output Board menu is
displayed.
Use the UP/DOWN arrow keys to select Current Loop Set-
2.
up. Press the ENTER key. The Current Loop Setup menu is
displayed.
3. Edit the settings as required (see next page). The 4-20mA
can be set to represent a particular flow range. It is also
possible to enter a negative figure for the minimum output
and this would enable a reverse flow to be monitored.
Outputs
41