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Reference Manual
00809-0100-4027, Rev AA
December 2005
Rosemount 4500
3-12
Table 3-1. Rosemount
(Standard) Alarm and Saturation
Values
Table 3-2. NAMUR-Compliant
Alarm and Saturation Values
Table 3-3. Custom Alarm and
Saturation Values
Failure mode alarm and saturation levels can be configured using a HART
Communicator or AMS, see “Alarm and Saturation Level Configuration” on
page 3-12. Per Table 3-3, custom alarm and saturation levels can be
configured between 3.6 mA and 3.9 mA for low values and between 20.1 mA
and 23 mA for high values. The following limitations exist for custom levels:
• Low alarm level must be less than the low saturation level
• High alarm level must be higher than the high saturation level
• High saturation level must not exceed 21.5 mA
• Alarm and saturation levels must be separated by at least 0.1 mA
The HART Communicator or AMS will provide an error message if a
configuration rule is violated.
Alarm and Saturation
Level Configuration
To configure alarm and saturation levels with a HART Communicator or AMS
perform the following procedure:
HART Communicator
1. From the HOME screen, follow the fast key sequence for “Alarm and
Saturation Levels”.
2. Select 7, Config. Alarm Level to configure alarm levels.
3. Select OK after setting the control loop to manual.
4. Select OK to acknowledge current settings.
5. Select desired setting, if “OTHER” is selected enter HI and LO custom
values.
6. Select OK to acknowledge the loop can be returned to automatic control.
7. Select 8, Config. Sat. Levels to configure saturation levels.
8. Repeat steps 3-6 to configure saturation levels.
Level 4–20 mA Saturation 4–20 mA Alarm
Low 3.9 mA ≤ 3.75 mA
High 20.8 mA ≥ 21.75 mA
Level 4–20 mA Saturation 4–20 mA Alarm
Low 3.8 mA ≤ 3.6 mA
High 20.5 mA ≥ 22.5 mA
Level 4–20 mA Saturation 4–20 mA Alarm
Low 3.7 mA — 3.9 mA 3.6 mA — 3.8 mA
High 20.1 mA — 21.5 mA 20.2 mA — 23.0 mA
Fast Keys
1, 4, 2, 7