Reference Manual
00809-0100-4022, Rev AA
July 2002
Model 4600
3-10
DETAILED SETUP
Failure Mode Alarm and
Saturation
The Model 4600 transmitter automatically and continuously perform
self-diagnostic routines. If the self-diagnostic routines detect a failure, the
transmitter drives the output to configured alarm values. The transmitter will
also drive the output to configured saturation values if the applied pressure
goes outside the 4-20 mA range values.
NOTE
The failure mode alarm direction can also be configured using the HART
Communicator or AMS.
NOTE
Under some failure conditions, the transmitter will ignore user configured
alarm conditions and drive the transmitter to low alarm.
The Model 4600 transmitter have three configurable options for failure mode
alarm and saturation levels:
• Rosemount (Standard), see Table 3-1
• Custom, see Table 3-2
Table 3-1. Rosemount
(Standard) Alarm and Saturation
Values
Table 3-2. 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 3-11. Per Table 3-2, 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.
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
3.7 mA — 3.9 mA
3.6 mA — 3.8 mA
High
20.1 mA — 21.5 mA
20.2 mA — 23.0 mA
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