Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART
Appendix
Hauser
121
Linear/Sqroot (055)
Selection
Specify current signal for the "Flow" measuring mode.
See also: "Set LRV" (056) and "Set URV" (057).
Prerequisite:
• "Measuring mode" (005) = Flow
Options:
• Linear
The linear pressure signal is used for the current output. The flow must be calculated
in the evaluation unit.
• Flow (square root)
The root flow signal is used for the current output. The "Flow (square root)" current
signal is indicated on the on-site display with a root symbol.
Factory setting:
Square root
Get LRV (015)
Entry
(only in pressure measuring
mode)
Set the lower-range value – reference pressure is present at the device.
The pressure for the lower current value (4 mA) is present at the device. With the
"Confirm" option,
you assign the lower current value to the pressure value present.
Options:
• Abort
• Confirm
Set LRV (056, 013, 166,
168)
Entry
Set the pressure value for the lower current value (4 mA).
Factory setting:
0.0 % in the level measuring mode;
0.0 or in accordance with ordering specifications in the pressure measuring mode
0.0 m
3
/h in the flow measureing mode
Get URV (016)
Entry
(only in pressure measuring
mode)
Set the upper-range value – reference pressure is present at the device.
The pressure for the upper current value (20 mA) is present at the device. With the
"Confirm" option, you assign the upper current value to the pressure value present.
Options:
• Abort
• Confirm
Set URV (057, 014, 167,
169)
Entry
Set the pressure value for the upper current value (20 mA).
Factory setting:
100.0 % in the level measuring mode;
URL sensor or in accordance with ordering information in the pressure measuring mode;
3600 m
3
/h in the flow measuring mode
Startcurrent (134)
Entry
Use this function to enter the start current.
This setting is also effective in the HART multidrop mode.
Options:
• 12 mA
• Max Alarm (22 mA, non-adjustable)
Factory setting:
12 mA
Curr. trim 4mA (135)
Entry
Enter the current value for the lower point (4 mA) of the current linear regression line.
You can adapt the current output to the transmission conditions with this parameter and
"Curr. trim 20mA".
Perform the current trim for the lower point as follows:
1.
Select the "Current" option in the "Simulation mode" parameter.
2.
Set the 4mA value in the "Sim. current" parameter.
3.
Enter the current value measured with the switching unit in the "Curr. trim 4mA"
parameter.
Input range:
Measured current ±0.2 mA
Factory setting:
4 mA
Parameter name
Description
