Rosemount 5401, Reference Manual

Page: 64 / 180

Reference Manual
00809-0100-4026, Rev FA
July 2009
Rosemount 5400 Series
5-10
Default settings for alarm mode:
• Measurement errors: Output current = High
• Measured value out of range: transmitter enters saturation mode (if
Limit Alarm is disabled)
Table 5-2. Analog Output:
Standard Alarm Values vs.
Saturation Values.
In saturation mode, if the primary variable is not in low alarm mode, the
minimum output is 3.9 mA. If the primary variable is not in high alarm mode,
the maximum output is 20.8 mA.
Table 5-3. Analog Output:
NAMUR-Compliant Alarm
Values vs. Saturation Values
Echo Tuning
When Basic Configuration is performed, the transmitter may need to be tuned
to handle disturbing objects in the tank. There are different methods available
for handling disturbance echoes with the Rosemount 5400 Series
Transmitter:
• Amplitude Threshold Curve (ATC)
• False Echo registration, see “Registration of False Echoes” on
page 7-7
The
Guided Setup
in the
Rosemount Radar Master
configuration program
includes a
Measure and Learn
function which automatically registers false
echoes and creates an ATC (see “Guided Setup” on page 5-15).
The created ATC is based on the present tank spectra and process condition
settings. Disturbances below the product surface might not be handled by the
Measure and Learn
function.
Level 4–20 mA Saturation Values 4–20 mA Alarm Value
Low 3.9 mA 3.75 mA
High 20.8 mA 21.75 mA
Level 4–20 mA Saturation Values 4–20 mA Alarm Value
High 20.5 mA 22.5 mA